Page History

...

1. If MEC was running, you will likely need to move M3H, aka M2H XRT, out. The out position is 18.5 (at least 18.1) on the X-gantry.
2. Once MEC mirror is out, you're free to open the HFX DG2 shutter if you've satisfied all of the notifications awr raised.
3. Open the pulse picker.
4. Insert the pop in monitor (PIM) YAG for DG1 (by moving the motor to 0) and look at the python view. You should hopefully see a hint of beam. If yes, we proceed. If no, consult the debugging steps below.
5. Use M2H FEE mirror (from the OMS panel opened earlier) to steer the beam left and right. Steps of 0.5 urad is big, 0.1 urad is small. Left is +, Right is -.
   1. If the beam vertical has to be changed, then we need to call ACR and request repointing. 20 um is a small ~1/4 screen move. 50 um is a larger ~1/2 screen width move.
6. If we are multiplexing with XPP or XCS, then they will want to insert their diamond window to pick off a portion of the beam. This will add wrinkles to the beam in your DG1 view.
   1. Call XCS or XPP and get them to reposition the diamond window if wrinkles are not pushed to the borders of your DG1 view. You won't get rid of them, but you can move them to the sides.
7. Once satisfied, screen grab the DG1 view and note the attenuation in the comment.
   1. Attach to inst. log
8. Hit F12 to close the pulse picker.
9. Remove the PIM Yag for DG1. Insert the PIM Yag for DG2 (after KB mirror) and navigate python viewer to CXIDG2Yag1
10. Set CXI attenuation to 1E-3, then open pulse picker. You should see beam on DG2. That is all we need to do (confirm).
    1. Take a screenshot of DG2 result & attach to inst. log
11. Hit F12 to close the pulse picker.
12. Remove DG2 PIM YAG.
13. Switch to the inline view of the jet (probably a DAQ camera, Opal variety)
14. insert the "Dangly D", a diode called SC1 LED stick.
15. Manipulate the stick Z (and possibly X/Y) until the crosshairs overlap the YAG.
    1. Remove the Dangly D.
    2. Turn off the LED
16. Set CXI attenuation to 1E-3 (should already be there) and Open the pulse picker.
17. hopefully you will see the beam on the YAG.
    1. Focus on the YAG using fine Z positioning of the stick. If necessary you can use coarse positioning.
    2. Take a screen shot of the YAG, noting the attenuation.

...

1. Open the thumb-screw that retains the rod.
2. Start pulling up the rod, until you can feel a hard stop. Avoid twisting the rod; pull straight up. Close the retaining thumb screw to keep the rod from falling down.
3. Close the gate valve (red button will be fully receeded).
4. Close the roughing pump (green ball valve on the shelving above the chamber, to the right as you see the smiley face of the chamber door).
5. Open the venting valve (black ball valve, near roughing valve).
6. Close the vent after the venting noise has ceased.
7. Open the clamp retaining the road, it looks like a make-shift shackle.
8. Pull out the rod.

Now we are ready to collect.

1. Hit F12
2. Position jet according to cross-hairs in inline view and cross-hairs in off-axis view using the fine motor controls of the rod.
3. Move detector to the correct position in Z. Control can be found in DS1 on cxihome (it's a collection of green circles). The motor value is password protected. The usual password.
4. Attenuate beam to 1E-8 and open fire
5. Begin ramping up beam intensity on the jet whilst keeping a trigger finger on F12 and monitoring CSPAD for bad times.
6. Once at target intensity, 1E-1 for LCP, hit F12, record a dark, then open for business.

Related articles

...