11/21/22
- Cost estimate submitted (seems higher than expected based on previous)
- Chao:
- LLRF System Control Design mostly done (just waiting on some simulation results from Zenghai_
- Start looking into Low-level RF system from Larry
- Frequency Control in Software
- Amplitude Flatness and Amplitude/Phase Control firmware
- Bo
- SSA almost ready to send out
- Klystron only needs 200W, making a 350Watt board
- Firmware/hardware ready to start development
- Stephen to check project tasks with people
9/12/2022
- We will be doing the 1.5 with 1 RFSoC setup, but the rest of the system is unclear (we may as RadioBeam to do it)
- Chao
- Currently working on data converter characterization
- Will probably be done in the next month
- Trying to determine what configuration would be ideal for the up and down conversion
- Noise analysis
- We need to figure what what (analog) band-pass filter we need.
- Still need to work out specifications for the algorithm (with RadioBeam + Kukhee)
- Larry
- In the next month:
- Identify digital IOs and decide if we can buy or need to make a card to accommodate
- After Chao is done with characterization, change the firmware interface from a real-real to real-IQ conversion and then take IQ to the core
- Need interface information from Kukhee
- Port register map to current software interface
- Kukhee
- Still catching up on things
- Discuss division of firmware(?) labor with Chao
- Need to discuss firmware/software division of signal conversion with RadioBeam
- Pulse-pulse control in firmware?
- Present a proposal on how to do this to RadioBeam
- Multi-cavity control in software?
- Bo
- Working on SSA
- Power supply is pulsed gate which requires a trigger
- Will eventually need to generate an interlock signal
- Will be out on vacation 9/26-10/5
- Kukhee and Chao to lead the meeting on algorithm discussion with RadioBeam?
- Stephen
- On medical leave 9/16-10/16
- Need to get a charge number for people to use
9/6/2022
- Meeting on Thursday with higher-ups
- We should use Teams for working with RadioBeam/other groups
- Need to get an understanding of how the firmware should function + division of work
- L. Doolittle typically does specialized, non-modular code (used in LCLS II) which can be hard to port over/understand.
- Can we have Chao/Larry do the firmware and have LCLS-RadioBeam define requirements/review our code
- Could also have them do some software tasks: Pentalinux P4P + efuse reading/writing for ultrascale+ platform
- Chao thinks Kukhee's code might be a good basis given a proper set of requirements
- Larry's slides on Phase 1.5 HW Block
![](/download/thumbnails/358223544/image2022-9-6_11-38-33.png?version=1&modificationDate=1662489513000&api=v2)
- 2Channels in, 1 Channel out Baluns
- ADCs to run at 2.4576 GS/s
- 12VDC power
- FMC Digital I/O requirements:
- Digital trigger output for SSA (1 channel, 0V - 3.3V).
- Will need modulator (2 channel), interlock (x channel), and debug (1 channel) output triggers in the future (not sure on specifications, discuss RadioBeam).
- Digital inputs TBD with RadioBeam
- Chao's Data Converter Characterization
- Trying to reocver/understand Dan's previous work
- Evaluation tool is limited to running 1.6us samples meaning stability is too low (want ~5us)
- Test: Signals from RFSOC loaded to DAC and looped back to ADCs. ADC output processed in Matlab (excludes op-amp downcoverter)
![](/download/attachments/358223544/image2022-9-6_12-13-32.png?version=1&modificationDate=1662491613000&api=v2)
- (Bo) Could do an FFT to check there's anything extra going on
- Next test to include up/down converters
- Chao's RFSoC SOM Purchase Proposal
- XRF16: 26 weeks, $30k/SOM + $6k/carrier. Will want 6x each ($216k)
- Ryan+Stephen: Budget plan is incomplete and Schedule is on existent
- We need a charge number for work on this project
8/29/2022
- Bo had her first meeting with the high power people last week
- Briefly discussed progress and later met with Radiobeam to discuss technical parts and RFSoC
- Most of their FPGA experience is Larry Doolittle
- We should consider having Radiobeam lead the hardware architecture design. Should discuss further with Ryan
- We
drive
it but they do the documentation
- Chao and Larry need to document the phase reference (LMK/LMX) clock distribution scheme
- Larry needs to complete importing Dan Van Winkle's .XCI and adding LMX to rogue software for next week and make sure it syncs with the ADCs and DACs
- Chao/Kukhee needs to define the exact interface between ADC/DAC and LLRF DSP
- Chao/Kukhee needs to define the specification for the LLRF DSP
- Chao will present the RFSoC SOM design trade study for next week's meeting (Note that Monday is a holiday)
- Recommend buying 16 channel SOM, but will need to provde a justification as it is high price (>$100k) and long lead time (>26week)
- Stephen to start taking meeting notes and review Ryan's Smartsheet stuff prior to official release of budget/schedule
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