LCLS Undulator Tuning

1
LCLS Undulator Tuning

• Zack Wolf, Yurii Levashov,
• Achim Weidemann, Seva Kaplounenko,
• Scott Jansson, Ralph Colon, Dave Jensen

2
MMF Hardware Installation
FAC April 20, 2006
FAC October 12, 2006
3
Undulator Work Flow
Tuning Time about 4 weeks
1 Week, Fine Tuning
1 Week, Rough Tuning
1 Week, Come to 20 C
lt1 Week, Finish Fiducialization
Peak Throughput 1 undulator per week
4
MMF Temperature
Achim Weidemann Previous two week time history
at the Kugler bench
Maintenance work was done on the MMF power
system causing the large changes In general, the
system meets stability requirements
5
Rough Tuning Bench Components
6
Rough Tuning Bench
Reference Pole
Undulator
Cam Movers
Zero Gauss Chamber
Bench
Cable Handling
7
Capacitive Sensor Alignment Performance
Undulator mechanically aligned to bench in 15
minutes
Yurii Levashov
8
Scans Begin And End In A Zero Gauss Chamber
Beginning zero field measurement
Ending zero field measurement
Senis Hall probe
Zero Offset Correction Assume linear offset
dependence on time
9
Y Trajectory Shims
Bx Shim New Design Smaller external
fields Uniform Bx field in gap
Old Shim Design
Inconel
Steel Spot weld
Yurii Levashov
10
Rough Tuning Test Plan
Achim Weidemann
1) Place undulator Use kinematic
mount 2) Mechanically align to test stand
Optical alignment check, use capacitive sensors
and cam movers 3) Magnetically align Hall probe
to undulator Move Hall probe in x and y to
magnetic center 4) Rough tuning Tune x and y
trajectories, anticipate magnetic
shield 5) Adjust gap Measure K, adjust gap to
set K to required value for that
undulator 6) Check alignment Alignment may
have changed from gap adjustment 7) Rough
tuning Anticipate magnetic shield 8) Add
magnetic shield 9) Check tuning
11
Each Undulator Has Its Own K Value
From Heinz-Dieter Nuhn
12
Fine Tuning Bench Components
13
Fine Tuning Bench
Undulator With Magnetic Shield
Cable Handling
Cam Movers
Kugler Bench
Steel Girder And Stands
14
Kugler Bench Performance
Measurements by Georg Gassner X Y straightness
spec lt 14 µm Pitch and yaw spec lt 4.2
µrad Specs met in long block region
15
Coils For Fine Tuning Bench
Short Coil Zero Gauss Chamber
Bx, By One Undulator Period Long Coils
I1
I2
Field Integral Coil
Dave Jensen
16
Fine Tuning Test Plan
Yurii Levashov
1) Place undulator Use kinematic mount,
use steel girder and stands, shield on 2)
Mechanically align to test stand Optical
alignment check, use capacitive sensors and cam
movers 3) Magnetically align Hall probe to
undulator Move Hall probe in x and y to
magnetic center 4) Determine the tuning axis
Move in x to where K has the required value 5)
Tuning Tune x and y trajectories,
phase 6) Add phase matching shims 7) Adjust
field integrals Use long coil, I1 and I2
for both Bx and By 8) Adjust field uniformity
Add quadrupole and sextupole shims as
necessary 9) Final checks before gluing shims
Check x and y trajectory, phase, phase
matching, field integrals, uniformity
17
Fine Tuning Test Plan (cont.)
10) Glue shims in place Remove y
trajectory, quadrupole, sextupole, and phase
shims, apply glue, replace 11) Check
the gap Make sure no parts of a shim
protrude into the gap 12) Check for errors while
gluing shims Check x and y trajectories,
phase, I1 and I2 of Bx and By, uniformity 13)
Map Bx and By in the retracted position 14)
Final results data set Measure Bx and
By at x -6, -5, , 6 mm, y -0.2, -0.08, 0
0.08, 0.2 mm, calculate field integrals
vs z, 65 scans 15) Find the x position, y0,
where K has the required value 16) Add
fiducialization magnets to both ends
Measure offsets from beam axis to the center of
the fiducialization magnets 17) Rough
fiducialization using alignment equipment 18)
Measure roll on flats at each undulator end 19)
Move undulator to CMM, finish fiducialization
18
Fiducialization
19
Hall Probe Calibration
Water NMR
HP3458
Chiller For probe temperature
Magnet
Metrolab NMR
Seva Kaplounenko
20
Schedule
Robert Ruland
21
Conclusion

• MMF construction is complete, temperature
  stability and set point accuracy
• requirements have been met
• The rough tuning bench is complete
• The Hall probe calibration system is complete
• The fine tuning bench has all components
  complete. Some fixturing work
• remains.
• The software is mostly complete. Some
  automation work remains.
• Mechanical alignment takes about 15 minutes.
• New Bx shims have been designed.
• The fine tuning bench construction meets all
  specifications.
• The expected throughput is one undulator per
  week. Each undulator,
• however, spends about 4 weeks in the MMF.
• One reference undulator gets re-measured every
  fourth undulator.