[matthew weaver] 14:39:16 First though. We should talk about how the 120 hertz works since that's how we actually get beam in LCLS one. [matthew weaver] 14:39:27 And you can do this in the superg and the neck as well if you want your being to be synchronized to the power line. [matthew weaver] 14:39:32 The accelerator conceptually monitors 3 phases of power and and divides that up into 6 different time slots. [matthew weaver] 14:39:45 At 60 hertz, like is you 360 hertz. And we choose. 2 of those to generate the 120 hertz beam. [matthew weaver] 14:39:53 But that can happen kind of at any time those, those, time slots, but we can't generate beam at any time. [matthew weaver] 14:40:03 Just because the A/C has a power as a 0 crossing. We have to, we have to limit our beam generation to well-known phases of the RF. [matthew weaver] 14:40:12 So When this is a blow up now of the A/C power line, one of the phases having it 0 crossing, we actually subsample that. [matthew weaver] 14:40:22 On a frequency for which the, RF repeats. So that we do. [matthew weaver] 14:40:31 Put beam on well known phases of the RF. And, since I didn't look up the date, I think it was 2, maybe I think even been. [matthew weaver] 14:40:40 Feels like it was earlier than 2,018 we chose to change the normal conducting Linux to use one fourteenth of a megahertz as its sampling of the power line. [matthew weaver] 14:40:53 Exactly for this reason. We knew that in the future of the super Connecticut Linux would then be able to generate beam on those. [matthew weaver] 14:41:01 At those same times. Okay. [joseph robinson] 14:41:04 Not gonna just clarify. So that does that mean then that the beam, is kind of times just off the 0 crossing essentially always at the closest the RF. [joseph robinson] 14:41:18 Phase that is closest to the 0 crossing essentially. [matthew weaver] 14:41:22 It's a little worse than that actually. There's a I show you here a measurement of where the time slot happens. [matthew weaver] 14:41:29 There's actually a predictive algorithm that goes into this. So it actually looks at the previous crossing to guess when the next one will be so that it can tell you a millisecond ahead of time. [matthew weaver] 14:41:41 When it's going to generate beam. So it's sort of targeting a time. [matthew weaver] 14:41:47 A millisecond in the future. So it has to make a guess. At the A/C crossing. And so it might miss. [matthew weaver] 14:41:53 That that guess of course cause the the A/C phase changes. Oh yeah, so there's some jitter in that with respect to the power line. [joseph robinson] 14:41:58 Right. Okay. [matthew weaver] 14:42:03 And Yeah. [joseph robinson] 14:42:05 Is that what is that what does that? what's the consequence of that? Is that, energy jets are in the machine then or something? [matthew weaver] 14:42:12 Yes. Yeah, that's the primary consequence. [joseph robinson] 14:42:14 Is that okay? [joseph robinson] 14:42:16 Thanks. [matthew weaver] 14:42:17 Yep. Okay. Okay, but if we do the set of fourteenth of megahertz, then both accelerators can participate in generating beam. [matthew weaver] 14:42:26 At the same time. Of course they have to agree upon when that A/C crossing happens. They're both capable now of doing that same measurement themselves and right now that's how it operates. [matthew weaver] 14:42:40 But when we do. Install this locking of the 2 Linux, then we have to connect. [matthew weaver] 14:42:47 The triggering of one to the other. So it's difficult to change the old system. So we just take an input from the old system and put it into the new system. [matthew weaver] 14:42:57 And so the supergnuting Linux will essentially become. Slave to the to the Nomo Kinak decisions. [matthew weaver] 14:43:06 If the normal conducting line goes down or down for some reason, then we just put the super tightly back into its master mode where it makes its own determination of the power line crossings. [matthew weaver] 14:43:19 Okay. So yeah, so this will help us actually generate beam in both machines at the same time with a well- relationship. [matthew weaver] 14:43:30 There are things like drift in the RF, which you'll have to track and correct for. [matthew weaver] 14:43:37 But, yeah, that should be possible. [matthew weaver] 14:43:42 Okay, so one of the questions Charlie asked me was to talk about XT cab operation And this is, slightly complicated, but, So we're planning to generate beam in in the Sabra, Dante, for the first year. [matthew weaver] 14:44:00 We've been targeting this this 33 kilohertz number. And the EXT CAV, of course, has a cluster on it, which can only fire at up to 120 hertz. [matthew weaver] 14:44:08 And so it's designed to fire at this at this trigger that's aligned to the A/C power. [matthew weaver] 14:44:17 And so. If we operate this way how often will these 2 things overlap so that you actually get an xdcaf measurement for your superington beam. [matthew weaver] 14:44:29 I actually have a confidence page which describes this in gory detail along with a lot of other things to consider. [matthew weaver] 14:44:36 About this but this is a table that's part of that. 33 kilohertz does not always overlap. [matthew weaver] 14:44:45 With the 120 hertz trigger It does some fraction of the time because the 2 machines are locked together, but 33 kilohertz is not a sub harmonic of that one fourteenth megahertz frequency so it's kind of a bit of a random chance as to when it'll happen. [matthew weaver] 14:45:05 When I'll overlap and you can see here this table tells you that it's on average 3.5 7% of the time. [matthew weaver] 14:45:12 So if the Execv is working at a hundred 20 hertz, you'll get about 4 and a half hertz. [matthew weaver] 14:45:18 Of those actually seeing the beam and the rest will sort of be the exdcave running in standby mode to stay warm. [matthew weaver] 14:45:25 As it's waiting for a trigger to fall into its bucket or waiting for a beam to fall into its bucket. [matthew weaver] 14:45:32 I'll note there are some series of blue numbers in here, which are sub harmonics of one fourteenth of a megahertz, where that if you put beam it at these rates, you'll have a much higher chance of putting it into the EXTAV. [matthew weaver] 14:45:52 That's one way to make better use of the XT Cav. Another way is to recognize the fact that, as I mentioned, this algorithm is for generating the time slots. [matthew weaver] 14:46:05 It's not very accurate. There's since it's predictive there's jitter and And that jitter's fairly large. [matthew weaver] 14:46:17 And by default. When we generate these 120 hertz triggers, we only allow one trigger opportunity for each 0 crossing. [matthew weaver] 14:46:26 I have a picture that'll show this, but in essence we can increase this overlap. By integer multiples by opening up that window of where the A/C power line crossing is. [matthew weaver] 14:46:38 So to go back to this. Idea of, sampling the A/C power line. And you look below, you can actually, since we know that this thing is uncertain to the level of 40,200 microseconds. [matthew weaver] 14:46:54 You can choose other samples around the 0 crossing. And they're essentially almost as just as good. Because that's just 14 microseconds of additional offset, kind of small, with respect to the uncertainty that's already there. [matthew weaver] 14:47:09 But by doing this, you've increased the ability to catch the beam by a factor of 3. So we could add a slightly more complicated scheme to the XT Cav. [matthew weaver] 14:47:21 To open up a window and allow itself to trigger if. Game is expected in one of these 3 smaller windows and that buys you an extra factor of 3, maybe 5, depending how much you want to open it up. [matthew weaver] 14:47:38 And I did some preparation for this in the next D-cav triggering design, but it's not I'm fully implemented, there's some complications about making sure you get the right time. [matthew weaver] 14:47:49 Timestamp for the beam pulse. Assigned to the xdcav data and things like that. [matthew weaver] 14:47:55 So, yeah. So you can see that. To get the SDK to see extra beam. [matthew weaver] 14:48:04 It's a little more complicated. Okay. So, I saw the title of this talk was about event timing compatibility. [matthew weaver] 14:48:17 So I thought I should say a few more words about this. You know, along with the Linac locking, you get another capability, which is to tie the 2 event timing systems together. [matthew weaver] 14:48:30 Since they have a well known phase relationship. So normal connecting timing carries producers at 360 hertz. [matthew weaver] 14:48:37 Sink to the power line or line to the power line. And but it's also occurs on this 100, this one fourteenth of a megahertz. [matthew weaver] 14:48:47 Frequency. It only carries information, event codes, timestamps, and pulls IDs from the normal, LINAC. [matthew weaver] 14:48:57 And, and the information arrives about 900 s microseconds before the beam. Depending on where you are in in the facility. [matthew weaver] 14:49:05 The secret, super. Diming has fiducials running at, you know, near megahertz. [matthew weaver] 14:49:10 You can see it's a factor of 13 more than this subrmonic. It only carries information about the superagnan accelerator. [matthew weaver] 14:49:17 And that information arrives about 100 microseconds before the beam. [matthew weaver] 14:49:23 And it could carry the normal nothing, solidar information with a little bit more work and some of that work's already been done. [matthew weaver] 14:49:33 And the reason it can is because the normal conducting accelerate information is available before the superc. So, super don't accelerator sends its stuff out. [matthew weaver] 14:49:47 So, you can put those 2 things together and keep them perfectly synchronized. In the timing system. [matthew weaver] 14:49:52 But the question is who. Who needs to take advantage of that. Here are 2 ways that you could do it. [matthew weaver] 14:50:00 The EVG sends out its own timing stream to the LCLS one devices, some of which are quite old and we would never upgrade. [matthew weaver] 14:50:12 It's own timing stream to the LCLS one devices, some of which are quite old and we would never upgrade, so we wouldn't change that. [matthew weaver] 14:50:13 But it can also send its information to the TPG, which could then merge that stuff onto its own stream of timing and then that goes out to everybody and anybody who's interested in parsing the the information from both accelerators can then do that. [matthew weaver] 14:50:27 That's when we're doing it. Another way of doing it. As if, recognize the fact that The only places that really see beams simultaneously from both accelerators is, you know, in the neuron hall and beyond. [matthew weaver] 14:50:41 And, you can do that merge then in the near end hall where you receive timing from both. [matthew weaver] 14:50:47 Systems in in the DAC timing system, which also goes to controls. And that's where. [matthew weaver] 14:50:55 The preparations already been done. Primarily because we had to handle the normal connecting. Timing system as part of the LC list to design. [matthew weaver] 14:51:07 First, with the CLTS project. So. Yeah, it's, it's, it's a little bit easier to do. [matthew weaver] 14:51:18 There's, a kind of a smaller set of clients. So it's it's less open-ended as to as to the applications that need it. [matthew weaver] 14:51:28 Yeah, when we do run, for instance, TXI with beam from both machines, we'll need to merge that information and record it. [matthew weaver] 14:51:36 So. Yeah, so that's sort of a small step. That still has yet to be done, but we can get there before TXI is ready. [matthew weaver] 14:51:46 I think that's that's all I've prepared. So please ask questions if there's things you wanna know. [matthew weaver] 14:51:57 So in about a month's time. They are reference distribution for will be locked together for both. [matthew weaver] 14:52:04 And it will allow us to use some ERC devices designed for. Literary for for for both or either. [matthew weaver] 14:52:13 For, for both or either. I'm the SDK, this is a diagnostic in sector one. [matthew weaver] 14:52:18 Is also using, clestons and RF devices that were built for LCL one frequencies. [matthew weaver] 14:52:26 That we can in fact use now if they were ready to turn on. [matthew weaver] 14:52:31 So, this, this ultimately this allows us to synchronize beam from both accelerators. [matthew weaver] 14:52:37 And, okay, so that's. That's where we're going. [Charlie Xu] 14:52:43 Thanks, Matt. I guess I have a question. Now the key cows, but on the face cap piece, right? [Charlie Xu] 14:52:52 A while ago, we, we chatted that the plan is to use the LCS one face cavity which is a Well, established beam instrument that people believes to look at an LCS 2 beam, due to the gender issues that we were seeing, right? [matthew weaver] 14:53:09 Yeah. [Charlie Xu] 14:53:09 So by the table yours kind of listed, right? Does that mean we'll only get effectively around 4.3 hertz of information? [matthew weaver] 14:53:22 Yeah, [matthew weaver] 14:53:25 That's right. Because we're set up to trigger the LCLS one phase cavity from the LCLS one timing system. [matthew weaver] 14:53:37 The only chance we get to triggers off of the 120 hertz. Signal. [matthew weaver] 14:53:47 Yeah, you don't actually have. Any higher frequencies embedded in your timing system. To use for triggering. [matthew weaver] 14:53:56 So, now. Yeah, so for normal running, that's right. This might be this might be the what we what your what you're faced with. [Charlie Xu] 14:54:09 So what if we recompile the image with the LCS 2? Tpr. [matthew weaver] 14:54:17 Yeah. Yeah, so that is. How the S, how the Ext. Is working it's It's built with the super conducting timing receiver. [Charlie Xu] 14:54:18 Margo. Right, because [matthew weaver] 14:54:31 As in his firmware, using the normal conducting RF frequencies for its, you know, RF cards. [matthew weaver] 14:54:38 And, and then, you can trigger, up to 71 kilohertz. [matthew weaver] 14:54:45 You know, you have to trigger on these sub harmonics to keep the RF phase relationship. [matthew weaver] 14:54:53 So. Yeah, if we're running at 33 kilohertz, You're getting, yeah, you'll get 4% again, but of a faster trigger. [matthew weaver] 14:55:04 Right. [Charlie Xu] 14:55:05 Okay, or if we ask the ACR to say like if we lower it to 10 kilohertz that actually have a higher chance that's 14%, right? [matthew weaver] 14:55:13 That's right. And it is 14% not of a hundred 20 hertz but of whatever rate you're trying to trigger. [Charlie Xu] 14:55:15 Okay. [matthew weaver] 14:55:21 4. So if we can run the Base cavity at 10 kilohertz, which I think we software might not, might not like it. [matthew weaver] 14:55:32 But, you could run the full 10 kilohertz. You know, because you're getting the super conducting timing. [matthew weaver] 14:55:39 Even though your RF is coming from the normal conducting, there's, you're, you have the full capability of. [matthew weaver] 14:55:45 Of a super conducting time, client. [Charlie Xu] 14:55:49 Okay. Great. [matthew weaver] 14:55:52 Just that this won't, 33 won't work for you, your RF will. [matthew weaver] 14:55:58 Drift will not drift but it'll You know, you'll be on different phases. [matthew weaver] 14:56:03 For different triggers. [Charlie Xu] 14:56:06 Oh. [Charlie Xu] 14:56:09 Oh, it will. [matthew weaver] 14:56:11 Yeah, you have to stick to the blue ones. Okay. Yeah. [Charlie Xu] 14:56:16 The integer was. Or the, so, oh, because the 14.2 9 is actually an integer hertz. [Charlie Xu] 14:56:25 Went, like, Cuckle it out. [matthew weaver] 14:56:28 You mean the for the 10 kilohertz frequency? [Charlie Xu] 14:56:31 Yeah, because I guess the part that word me when you say it was slightly drift because this fractional relationship, right? [Charlie Xu] 14:56:38 Because if I'm making a face comparison but the RF underneath me changed. Then technically it's that the phase cavity algorithm sees this. [Charlie Xu] 14:56:47 Face delta, right? [matthew weaver] 14:56:48 And yeah, at this 10 kilohertz number, you're fine, cause the RF. [matthew weaver] 14:56:54 Exactly. This, yeah. And any of these blue numbers, then you're fine. [Charlie Xu] 14:56:55 Okay. Okay. [Charlie Xu] 14:57:01 Okay. Mike, Joe, do you have more XT Caf questions, especially since TMO plan to use for the. [Charlie Xu] 14:57:12 I don't like impulse shaping as well. [joseph robinson] 14:57:16 Trying to wrap my head around this a little bit. [Silke Nelson] 14:57:21 Yeah, I'm, I'm not sure I fully understand this. Why does the, do we have 2 XT calves just to kind of confirm that? [matthew weaver] 14:57:30 No, well, yes, there's one on, if you want to call it that, there's a soft x-ray, XT cabin and a hard X ray XT cab. [Silke Nelson] 14:57:37 Okay. [matthew weaver] 14:57:38 It's one clestron that's, you know, pulsing it. But they're 2 cameras, they're seeing the image. [Silke Nelson] 14:57:41 Okay, so I see because it's the one classroom that's where the 120 hertz needs comes from that makes this a problematic for the soft x-ray line. [Silke Nelson] 14:57:52 Okay, I think I got that. [matthew weaver] 14:57:55 Yeah, the fact we're using a Clystron, even if they were separate claustrons, you'd still be stuck with a hundred 20 hertz. [matthew weaver] 14:58:01 You could do both independently. It's a little more complicated that. If you want to run beam at the same time down the 2 different undulator lines, the EXT cab has to sort of decide. [matthew weaver] 14:58:15 How it wants to distribute its 120 hertz of triggers. [Silke Nelson] 14:58:19 Oh, oh, interesting. Has it been thought through like what we do when 2 people want it? [Silke Nelson] 14:58:26 Isn't something we have to plan into experiment scheduling somehow? [matthew weaver] 14:58:30 No, it's there is a configuration for it. typically if you wanted to use the exdcave for 2 things at the same time you will divide the power up evenly. [matthew weaver] 14:58:42 There's a little power splitter between the 2 cavities. So the 2 cavities. So the claustron will actually fire power into both cavities. [Silke Nelson] 14:58:51 Oh, I see. [matthew weaver] 14:58:51 And you'll you'll have to divide up. Trigger timing at between 60 hertz between the 2. [matthew weaver] 14:59:00 That's at least the decision they've made in the XT H. Design. [Silke Nelson] 14:59:04 Okay, so. Doesn't mean so I'm having my 6. I experiment that decides that they will need the SDK for whatever reason. [Silke Nelson] 14:59:12 So then if And doesn't mean team will can't have the Xtcap or does it mean 60 has to live with 60 hertz? [matthew weaver] 14:59:20 If they both wanna use it, then yeah, TXI will. Get 60 hertz. [Silke Nelson] 14:59:26 Okay. Okay, that's kind of what I meant. So I think we should kind of, this talk to people about it. [matthew weaver] 14:59:27 And Timo will get half of. Okay. [Silke Nelson] 14:59:34 It's not so one of the most precious things ever, but it's kind of good to know. [matthew weaver] 14:59:38 Yeah, I don't think the sharing is gonna happen. Right away. They they want to you know commission this and understand it well on one beam line at a time. [Silke Nelson] 14:59:38 Cause I wasn't aware of that. Cool. [matthew weaver] 14:59:49 That's kind of a xd CAD specific. [matthew weaver] 14:59:54 Issue. It's a kind of a complicated device. [Charlie Xu] 14:59:56 Okay. Okay. Oh, like, Joe, I was gonna move on to the XPP question if you have. [joseph robinson] 15:00:01 So. Gotcha. [joseph robinson] 15:00:08 I'm just, wanna make sure I'm clear on it. So, So the A/C percent is basically the fraction of the 1 20 hertz that is coincides with the higher repetition rate, so. [joseph robinson] 15:00:23 At a. Divisor of 26 right at the 35 kilohertz You're seeing half of the so 60 hertz of the 120 hertz aligns with that. [matthew weaver] 15:00:29 Yep. [joseph robinson] 15:00:35 35 kilometers, right? [matthew weaver] 15:00:37 Yeah, it's still, you know, random, but you just have a 50% chance of it. [matthew weaver] 15:00:43 Each time. Yeah. [joseph robinson] 15:00:43 Okay, so. Yeah, so that's quite a substantial difference then between what we're planning to to run the laser at 33 ellipses. [joseph robinson] 15:00:54 May, a couple of kilohertz away. You could substantially increase that number right from Yeah. [matthew weaver] 15:01:01 That's right. [joseph robinson] 15:01:04 300% to 50%. Not sure how much that will matter for the experiments. I guess for the one micron lasers that we're planning to implement this will all be a lot easier because we're not as restricted in repetition rates. [joseph robinson] 15:01:17 That. [joseph robinson] 15:01:21 Yeah, interesting. [junyang xiang] 15:01:23 Joe, I think I talked to one of you about this quickly. I think there is, you can change divider. [joseph robinson] 15:01:28 Yeah, I mean it would. We choose that post. Yeah, exactly. Reduces the pulse energy and then there's a knock on effect. [junyang xiang] 15:01:29 But then the rest of the system has to fall in line as well. [junyang xiang] 15:01:35 Yeah. [joseph robinson] 15:01:35 Throughout. Right. So it's, it's not beyond the bounds of possibility. [joseph robinson] 15:01:42 You just have to make sure they [junyang xiang] 15:01:44 Yeah, but there's a lot of tuning required. Also on the RF side because [joseph robinson] 15:01:48 Hmm, right. And I guess for something like T XI. We would need to run the laser. [joseph robinson] 15:01:59 If we're doing doing if we tried to pump, an experiments. Using the one micron lasers. [joseph robinson] 15:02:11 At. [joseph robinson] 15:02:15 While they using the normal conducting Linux. Which I'm sure will happen at some point in the future and maybe this is similar to the XPP question. [joseph robinson] 15:02:24 We would need to run a repetition rate that says sub harmonic of that. 71 kilos again, right? [joseph robinson] 15:02:34 Is that right? [matthew weaver] 15:02:37 I guess I don't know the situation. We're running the 120 hertz, the normal conducting What are we doing with the super-connecting Linux? [joseph robinson] 15:02:42 Yeah. [Charlie Xu] 15:02:45 Not any. So I think the situation is XPP is gonna get upgraded to be ready taking hard x-ray super connectivity but they're gonna they're so ahead of the curve and a finish before the Linux is ready. [Charlie Xu] 15:03:00 So there is this idea to use the the LCS 2 laser pumping with the LCS one x-ray probing as a proof of concept. [matthew weaver] 15:03:13 Okay, yeah. Yeah, so you're you're right being at 35 kilohertz would be it. [matthew weaver] 15:03:21 Big help. You'll be 50% likely to have pumped the pulse that. Aligned with the x-ray that came down. [joseph robinson] 15:03:32 And I guess if, if you take that, if you. Go down. If we were to run the laser at something closer to 1 20 hertz, I guess none of these numbers line up with 120. [joseph robinson] 15:03:48 It's none of the sub harmonics of. The 928 kilohertz. [joseph robinson] 15:03:53 Line up with 1 20 hertz right. So. [matthew weaver] 15:03:58 Well, because the, power line is sampled with the 71 kilohertz. [matthew weaver] 15:04:02 71 killers always overlaps with the A/C, 120 hertz. So yeah, I think. [joseph robinson] 15:04:05 Right. [matthew weaver] 15:04:10 I mean, this table is describing that, I guess. [joseph robinson] 15:04:12 Okay. Yeah, I'm just wondering, you know, we may not. For the experiment, they may not want to have laser lights in at. [joseph robinson] 15:04:21 71 kilohertz whilst Alright, this is just speculation. I don't know for sure. [joseph robinson] 15:04:26 But. You know, they may know what to run the laser. Like, hitting the sample. [joseph robinson] 15:04:32 At all the other non x-ray. Buckets basically. So. [matthew weaver] 15:04:38 Yeah, but in this case, I think you'd run it like an LCLUS one laser. [matthew weaver] 15:04:42 Where it fires a hundred 20 hertz, but that 120 hertz isn't The fixed spacing, 120 hertz is the A/C. [joseph robinson] 15:04:49 Right. Yeah, yeah. Wandering around to follow the they see. [matthew weaver] 15:04:52 Space. Yeah. [joseph robinson] 15:04:56 Okay. [joseph robinson] 15:05:04 In kind. I would, so is this. Is this scheme intended to be the default way in which the accelerators are operated? [joseph robinson] 15:05:16 So. Provided that the normal conducting like is running the 2 will be synchronized together all the time is that is that the intent [matthew weaver] 15:05:23 Yes. Yeah. And, and, and facet too by not by their choosing, but. Yeah, it's yeah, we don't wanna, switch back and forth. [joseph robinson] 15:05:29 Sure. [joseph robinson] 15:05:45 Is Michael and Mike got any questions? [mike glownia] 15:05:49 Yeah, no, I'm, yeah, still wrapping my head around this. I mean, it's. [joseph robinson] 15:05:53 Yeah. [mike glownia] 15:05:53 This just seems a little brutal for Right. Well, they need to see what their pulses are doing. [joseph robinson] 15:05:59 Backslap because of that. [Charlie Xu] 15:06:00 Yeah, especially the Okay. [joseph robinson] 15:06:04 Yeah. [mike glownia] 15:06:05 Right. But I assume they already know this. So, there's really nothing we can do about it. [joseph robinson] 15:06:13 And then I guess if it's if it's the reason for the 33, I guess was driven mostly by the laser, right? [mike glownia] 15:06:19 Okay. [joseph robinson] 15:06:22 If it's a laserless experiment, it could potentially run at 35 kilohertz. [mike glownia] 15:06:28 Right, but even then you're still catching. Yeah, I guess it's true since the XT caps only 120 hertz you're missing most of your information anyways so [joseph robinson] 15:06:29 Second. [joseph robinson] 15:06:37 Right. [mike glownia] 15:06:38 Yeah, I guess just running a 10 hertz or one hertz or 3 hertz is a [joseph robinson] 15:06:43 What was it? What was the what was the rate they were? They were aiming for like an 8 kilohertz rap rate at some point, right? [mike glownia] 15:06:50 Something like that, which again, lasers. [joseph robinson] 15:06:54 Which of these is? So I guess none of the sub harmonics of 2828. [joseph robinson] 15:07:02 The divide by 28 match up with the blue rows rate. [mike glownia] 15:07:05 Right. [mike glownia] 15:07:10 Yeah, that's a drag. [matthew weaver] 15:07:11 That's not true. No. I think. [joseph robinson] 15:07:11 Is that not true? [matthew weaver] 15:07:18 What? [matthew weaver] 15:07:21 Yeah, some harmonic use of those 2 frequencies. [joseph robinson] 15:07:29 There is one there. Is that right? Can't do this. [matthew weaver] 15:07:33 Yeah. I think if we went back to here, we could. [mike glownia] 15:07:36 Yeah, that this hurts a little bit. But no, I mean, this looks, this makes me feel. [joseph robinson] 15:07:39 Okay. [mike glownia] 15:07:44 I guess [joseph robinson] 15:07:48 Wait, yeah. [joseph robinson] 15:07:51 So at the moment, right, the plan is to get to 33 kilohertz with the accelerator, right, which is not a good frequency for for this at all. [mike glownia] 15:07:57 Okay. [matthew weaver] 15:08:00 Right. [joseph robinson] 15:08:03 A [matthew weaver] 15:08:09 I, yeah, and. Yeah, if there's a big motivation to change plans, because of this. [joseph robinson] 15:08:16 Right. [matthew weaver] 15:08:20 Yeah, I think that conversation should get started. [joseph robinson] 15:08:20 Yeah. [joseph robinson] 15:08:26 Certainly there is a there's a big benefit to. Like if it's needed to have a high frequency of. [joseph robinson] 15:08:33 XT, CAV, Data, Wind. Yeah, doing streaking experiments, for example, where you need the laser to go in. [joseph robinson] 15:08:41 35 kilohertz would be far better than. 3 And that may not be a massive impact on the laser performance. [matthew weaver] 15:08:45 Yeah, great. [joseph robinson] 15:08:51 But I guess there was a reason why we chose, I guess we went for the. [joseph robinson] 15:08:56 Lowest frequency. Let me good. [joseph robinson] 15:09:04 We wanted to maximize the pulse, the laser pulse energy. One of the motivations and there was also some some connection with the detector. [joseph robinson] 15:09:15 Rep rates too. [joseph robinson] 15:09:18 Like the maximum detector repr and trying to maximize the data from moons. [matthew weaver] 15:09:28 Right, hello. That planning a lot since then. [joseph robinson] 15:09:31 That may have changed. Yeah, right. [joseph robinson] 15:09:39 You guys the key question is. How much does the XT have data needed when laser is also running into the the experiment. [matthew weaver] 15:09:54 Right. [joseph robinson] 15:09:54 We need to talk with James and Co. [Charlie Xu] 15:10:06 Okay. Do you think that's all the question I had? Matt, I will follow up with you offline about what we can do with Peacock because. [Charlie Xu] 15:10:18 That's one of the. Sinks that the 80 people agreed that the It's a good valid test. [Charlie Xu] 15:10:26 Of the SS 2 beam since. And then like the availability of the face cavity for SS 2 is in question. [matthew weaver] 15:10:34 Yeah, should we thinking about how to run the phase cavity faster? They'll say let's wanna face Gabby. [Charlie Xu] 15:10:34 Yeah. [Charlie Xu] 15:10:41 Yeah, I think the server landing is the LSS 2, the LCS one soft x-ray face cap D is essentially not being used. [Charlie Xu] 15:10:53 Sadly, Dran, I was just talking that we might want to actually. Use it for an XP. [Charlie Xu] 15:11:01 Because they sit in the near hole. So we're going to plug the hard x-ray info into the soft x ray. [Charlie Xu] 15:11:08 Card but I think this is more important. [Charlie Xu] 15:11:13 But also it sounds like if we're to upgrade that the event receiver module. [Charlie Xu] 15:11:20 Quarter of the firmware. We have the ability to truce LS one versus LSS 2. [matthew weaver] 15:11:27 We haven't, we have, right now we have separate boards in the xdcal system. One is super conducting. [Charlie Xu] 15:11:29 The [matthew weaver] 15:11:34 The others normal conducting. So we haven't. Made it, runtime configured. [Charlie Xu] 15:11:40 Yeah. Yeah, no, let's talk about that. And can you send the slides for this? [Charlie Xu] 15:11:50 I think people would love to refer to it. [joseph robinson] 15:11:51 Yeah, I'll be helpful. Just one quick question, I guess. If you were running the LCS 2 lasers off the to try and align with the 120 hertz. [Charlie Xu] 15:11:53 Yeah. [joseph robinson] 15:12:03 We just be basically using the normal conducting event codes as the trigger. Is that right? Is there? [matthew weaver] 15:12:11 I [joseph robinson] 15:12:12 Is that is that a ways to look at it or not? [matthew weaver] 15:12:15 I'm sorry, my mind went to different place. So you, you, wanna align the lasers to the 120 hertz beam you're saying? [joseph robinson] 15:12:25 Yeah. [matthew weaver] 15:12:26 Coming down is coming down the super Connecting Linux or the normal conducting the neck. [joseph robinson] 15:12:31 So this would be, it would be the say the one micron laser that is nominally synchronized to the LCS 2 frequencies running at 120 hertz to align with the normal conducting. [joseph robinson] 15:12:50 Yeah. [matthew weaver] 15:12:51 Okay, so if you're trying to trigger off of the normal conducting, the only reason why I ask is because The 2 timing systems don't know what the other one is doing as far as generating beam. [joseph robinson] 15:13:02 Okay. [matthew weaver] 15:13:02 We're trying to trigger off of normal conducting beam, then you want to listen to the normal conducting timing system. [joseph robinson] 15:13:07 Okay, so you basically would use the event codes from the normal come backing timing system to trigger the 120 hertz. [matthew weaver] 15:13:13 Yeah. And At least until we generate real support for uniting the 2 timing systems. When we do that, then the clients will be able to, you know, get information from both. [junyang xiang] 15:13:15 Good. [matthew weaver] 15:13:27 As super connecting timing and trigger from both So it'll know when beam is coming down the normal connecting Linux as well as the super connecting so you can make a choice as to what you want to trigger on. [joseph robinson] 15:13:38 Okay. [junyang xiang] 15:13:39 But Joe, you would end up with some. [junyang xiang] 15:13:43 Right, that's not. It has to coincide with the RF divided down rate. [joseph robinson] 15:13:48 Isn't that wouldn't that be the case though with the 120 hertz right since the aligning with the Yeah. [junyang xiang] 15:13:51 Yeah. [matthew weaver] 15:13:55 Yeah. [Charlie Xu] 15:13:55 Not really, right? Because it's a fractions. Relationship. [junyang xiang] 15:13:58 Right. [joseph robinson] 15:14:02 Hmm. Okay. [junyang xiang] 15:14:04 Cause your trigger is, you, LCLS one triggers at 120 hertz. Don't coincide with any of these. [joseph robinson] 15:14:13 Right, but I think. [Charlie Xu] 15:14:18 Because we're still locking to the 2.6 of the SS 2. Even though you could be triggering it using access one but to the [junyang xiang] 15:14:26 Yes, the trigger lining up with your actual. Correct. Location would just be fractional. [matthew weaver] 15:14:34 Right, you have one of 2 states. If you're, talking about the laser at 35 kilohertz. [joseph robinson] 15:14:40 Nice would be the laser at 1 20. [joseph robinson] 15:14:44 Right. [matthew weaver] 15:14:44 Oh, sorry, right. Yeah. [joseph robinson] 15:14:47 I can, yeah, we synchronize the oscillator with the. I would have thought this would be nice to synchronize the optim. [matthew weaver] 15:14:53 Oh, yeah, no, yeah, I think the answer is yes. This is, this is a laser bill for Elsie was too frequencies. [junyang xiang] 15:14:54 Different hardware. [joseph robinson] 15:15:00 Right. [matthew weaver] 15:15:04 So, so you are naturally on a harmonic of 71 kilohertz. [joseph robinson] 15:15:10 Right. Yes. At 1313, 13, at that whatever it is. [junyang xiang] 15:15:10 Oh, I guess. [matthew weaver] 15:15:11 Okay. [matthew weaver] 15:15:16 So the 1 20 will always fall on a 71 kilohertz. [joseph robinson] 15:15:18 Okay. [matthew weaver] 15:15:25 Particular phase of 31 kilohertz. [Charlie Xu] 15:15:29 So I guess the question is, Joe, can we? Triggered a laser at 71 kilohertz. [Charlie Xu] 15:15:36 Just not being probed. [joseph robinson] 15:15:40 Surely doesn't the normal conducting Event code. No, I didn't know. [matthew weaver] 15:15:40 Okay. [junyang xiang] 15:15:51 No, I think you're right, right, doesn't the 1 20 should be a sub harmonic of 7. [junyang xiang] 15:15:55 Send me one kilohertz. [matthew weaver] 15:15:57 Right. [joseph robinson] 15:15:58 Yeah. I mean, it's not exactly all, but it's kind of drifting around to match it. [Charlie Xu] 15:16:02 But. [joseph robinson] 15:16:06 71. Not really 71. Cause it's kind of. Moving to follow the A/C. [Charlie Xu] 15:16:06 I sing the scene. [joseph robinson] 15:16:14 Is that right? [matthew weaver] 15:16:14 It's always on the 71 kilohertz. [joseph robinson] 15:16:17 Okay, that is that is not quite the 0 cost. [Charlie Xu] 15:16:22 But your issue is that there's many more. Pump light before the prop like comes. [Charlie Xu] 15:16:30 And is that okay? [joseph robinson] 15:16:32 This is why I'm trying to get out like can we can we just trigger the laser say the AOM in the laser at a hundred the 120 hertz by using a normal conducting event code. [joseph robinson] 15:16:45 At 20. Does that work? [matthew weaver] 15:16:47 It should work. [joseph robinson] 15:16:48 Right. I mean, it's not exactly a hundred 20 hertz, right? It's. [matthew weaver] 15:16:51 From a timing perspective it should work. [joseph robinson] 15:16:53 Yeah. [joseph robinson] 15:16:57 Yeah. Okay. [junyang xiang] 15:17:01 I mean, is that, I mean, not essentially. [junyang xiang] 15:17:07 If you Cause the problem though Joe is that you're already like you're stuck flying with the R. [junyang xiang] 15:17:16 Or I sing on Carmates, they are operating at. So. [joseph robinson] 15:17:20 Oh, that's true. Yeah, but that's that's a harmonic. One [junyang xiang] 15:17:22 So. [junyang xiang] 15:17:27 Right, but the problem is Here there's no exact 120 hertz that like the closest is 100.5 herds And that's. [junyang xiang] 15:17:38 Where the multiple should be. [junyang xiang] 15:17:41 Otherwise you still get some skipping until they line up. Right. [joseph robinson] 15:17:46 Hmm. [Donny Magana] 15:17:46 But we should be able to find a frequency nearby that is a harmonic. [junyang xiang] 15:17:50 But that you're in your background doesn't match the normal conducting beam rate. [junyang xiang] 15:17:57 That's the whole one. You're, you know. [joseph robinson] 15:18:02 Yeah, I guess you're right at the. The laser has to, the laser itself would be running at some [junyang xiang] 15:18:10 930. [joseph robinson] 15:18:13 Yeah, probably actually less, right? To go with the highest pulse energy. The highest pulse energy would have to run at [joseph robinson] 15:18:22 Basically around 40 kilohertz or so. Less than 40 kilohertz essentially. So the 35 kilohertz. [joseph robinson] 15:18:30 Rep rates would be the region. The region would have to Yeah, where you can you can change the rate of the yeah so the We, GEN, we've run it 35 kilos, but you could pick it down. [junyang xiang] 15:18:33 Yeah. Yeah, and usually for essentially the one micron. You'll change the. [Donny Magana] 15:18:36 Right. [junyang xiang] 15:18:42 Right [joseph robinson] 15:18:51 With the output AOM to end in normally a hundred 20 hertz, right? But And does that then line up? [joseph robinson] 15:18:58 With [matthew weaver] 15:19:04 Half the time. [joseph robinson] 15:19:04 I think. 50% of the time, right? [joseph robinson] 15:19:11 Is that right? [matthew weaver] 15:19:12 Yes. [junyang xiang] 15:19:13 Yeah, which means effectively you get every other pulse. [joseph robinson] 15:19:18 Okay. [junyang xiang] 15:19:22 But you still have the other pulses in between because it still has to output something, right? No does not. [joseph robinson] 15:19:27 So then that would mean if we were to use the Well, micron lasers for either TXI or TXI using the normal conducting. [joseph robinson] 15:19:37 X ray beam or XPP using the normal conducting x-ray beam. We don't only get over that half the time at 60 hertz effectively. [joseph robinson] 15:19:47 Is that right? [matthew weaver] 15:19:49 Yes, yeah, if you have to gate it at 35 [joseph robinson] 15:19:55 Or we could run at a higher, we could run at higher rates with the region, but then we have the pulse energy in. [joseph robinson] 15:20:02 So that, yeah, you have to look at that. On a case by case basis, I guess, to see. [joseph robinson] 15:20:07 What would make sense. [joseph robinson] 15:20:16 Nice simple timing system this. [matthew weaver] 15:20:18 Okay. [joseph robinson] 15:20:19 Yeah. [junyang xiang] 15:20:23 I mean, if the laser could just follow the rate at the machine. All of that. [joseph robinson] 15:20:27 Okay. [Charlie Xu] 15:20:37 Correct. We can finish, right? No. [joseph robinson] 15:20:43 Yeah, thanks a lot. Thanks for organize it, Charlie. [matthew weaver] 15:20:45 Okay. [Charlie Xu] 15:20:46 Yeah. Yeah. Thank you, Matt. [matthew weaver] 15:20:48 Okay. [Charlie Xu] 15:20:50 Okay. Thank you [Silke Nelson] 15:20:50 Yeah, thank you [Donny Magana] 15:20:51 Thank you