Written by R. Iverson 20Jun2014
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Name: LTU x/y coupling correction study phase I with QSM1 skew quad and LTU x, y, and “u” wires.
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Shifts: 4 hours
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Purpose: Minimize the coupling measured at the LTU wires.
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Details:
1. Starting with a hard-X-ray beam energy, 150pC, ~40fs, save magnet configs for 21-BSY and
LTU.
2. Document the beam ellipse and twiss parameters at the LI28 and LTU wires.
3. Document FEL energy.
4. Take oscillation data at the muon shield wall area.
5. Scan QSM1 vs FEL energy and vertical emittance at the LTU wires.
6. Set QSM1 for minimum emit_y and maximum FEL – hopefully the same quad setting.
7. Touch up FEL with QEM1-4.
8. Document beam ellipse and twiss parameters.
9. Document FEL energy change.
10. Take oscillation data at the muon shield wall area.
11. Save magnet configs for 21-BSY and LTU.
Extra credit:
12. Update polynomials for FFTB quads in the BSY and LTU then set QEM1-4 quads to design and
STDZ all quads.
13. Match the beam at the LTU wires using the BSY quads.
14. Scan QSM1 vs FEL energy and vertical emittance at the LTU wires.
15. Set QSM1 for minimum emit_y and maximum FEL – hopefully the same quad setting.
16. Optimize FEL by tuning BSY quads but leave QSM1 alone.
17. Document beam ellipse and twiss parameters.
18. Document FEL energy.
19. Take oscillation data at the muon shield wall area.
20. Save magnet configs for 21-BSY and LTU.
Written by R. Iverson 23Jun2014
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Name: BSY skew quad commissioning phase I.

Shifts: 4 hours

Purpose: Minimize the coupling measured at the LTU wires.

Details:
21. Starting with a hard-X-ray beam energy, 150pC, ~40fs, save magnet configs for 21-BSY and
LTU.
22. Document the beam ellipse and twiss parameters at the LI28 and LTU wires.
23. Document FEL energy.
24. Take oscillation data at the muon shield wall area.
25. Scan QSM1 vs FEL energy and vertical emittance at the LTU wires.
26. Take BSA data and document coupling coefficient between BPM:83:X and BPM:290, 390 &
490:Y for QSM1 over the same scan range.
27. Set QSM1 for minimum emit_y and maximum FEL – hopefully the same quad setting.
28. Verify that the Coupling coefficient between BPM:83:X and BPM:290, 390 & 490:Y is <0.1.
29. Touch up FEL with QEM1-4.
30. Document beam ellipse and twiss parameters.
31. Document FEL energy change.
32. Take oscillation data at the muon shield wall area.
33. Save magnet configs for 21-BSY and LTU.
List written by R. Iverson 11July2014
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Name: LTU matching study.
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Shifts: 3 hours

Purpose: Correct the orbit response at the entry to the LTU by changing the strength of selected
quads from QVM1 to QVM4.

Details:
1. Starting with any beam energy, bunch charge >/=150pC, establish >2mJ.
2. Make sure the ESTB kicker is off.
3. Save magnet configs.
4. Document FEL energy as well as twiss parameters and beam ellipse at LI28 and LTU.
5. Match the beam twiss parameters at the LI28 wires.
6. Use the LEM server to set all quadrupoles in the LTU to design including the LTU matching
quads. Standardize the BSY and LTU quad magnets. Degauss QSM1.
7. Document the LTU twiss parameters and beam ellipse.
8. Take orbit response data.
9. Vary QVM1, QVM2, QVM3 and QVM4 as needed to correct the measured orbit response in both
the horizontal and vertical plane.
10. Document the beam twiss parameters at the LTU wires. The mismatch should be reduced.
11. Scan QSM1 to minimize x-y coupling from BSY to the end of DL2.
12. Document location of residual x-y coupling downstream of DL2.
13. Verify with BSA data that the coupling coefficient between BPM:83:X and BPM:290, 390 & 490:Y
is less than 10%.
14. Document LTU beam ellipse and twiss parameters.
15. Save magnet configs for 21-BSY and LTU and document FEL energy change.
WSVM1 Commissioning Procedure (≥ 2 shifts)
R. Iverson, September 11, 2014
Wire scanner WSVM1 to be installed on the beam line in early October, 2014
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
Pre-Beam – Local system check-out in tunnel [access, 3 hrs]
o Verify device labels [0 hr]
o Verify PMT voltage control and EPICs read back [0.5 hr]
o Calibrate motion [2 hrs]
o Verify normal operation using wire scanner GUI [0.5 hr]
o Verify there is no rise in local vacuum pressure over full range of motion [0 hr]
o Inspect site for tools, disconnections, interferences, etc. [0 hr]
Beam on – Verify wire scanner operation – [no access, two 5-hour blocks of time]
First block [5 hr]:
o
o
o
o
o
o
o
o
o
With wire retracted, take a <5-GeV beam (≤150 pC) through LTU to TDUND [0.5 hr].
Optimize PMT voltage and timing when the wire is parked in the beam [0.5 hr]
Verify beam profile in x and y using wire scanner GUI and optimize wire scan ranges
[0.5 hr].
Establish QA0 quad scan range [should be from 0.5 to 1.2 times nominal BDES] to
measure emittance in x and y using emittance measurement GUI [0.5 hr]
Correct twiss parameters at WSVM1 using beta matching GUI [0.5 hr]
Set LTU QEM matching quads to design and document residual mis-match at WS32
[0.5 hr]
Match the beam at LI28, WSVM1 and WS32 and note corrections needed [2 hr]
Save magnet configs [0 hr]
Retract WSVM1 wires [0 hr].
Second block [5 hr]:
o
o
o
o
o
o
o
o
o
With wire retracted, take a >10-GeV beam (≤150 pC) through LTU to TDUND [0.5 hr].
Verify PMT voltage [0.5 hr]
Verify beam profile in x and y using wire scanner GUI and verify wire scan ranges
[0.5 hr]
Scan QA0 quad to measure emittance in x and y [0.5 hr]
Correct twiss parameters at WSVM1 using beta matching GUI [0.5 hr]
Set LTU QEM matching quads to design and document residual mis-match at WS32
[0.5 hr]
Match the beam at LI28, WSVM1 and WS32 and note correction needed [2 hr]
Save magnet configs [0 hr]
Retract WSVM1 wires [0 hr]