lcls undulator tuning
DESCRIPTION
LCLS Undulator Tuning. Zack Wolf, Yurii Levashov, Achim Weidemann, Seva Kaplounenko, Scott Jansson, Ralph Colon, Dave Jensen. MMF Hardware Installation. FAC April 20, 2006. FAC October 12, 2006. Undulator Work Flow. Tuning Time: about 4 weeks. 1 Week, Fine Tuning. 1 Week, Rough Tuning. - PowerPoint PPT PresentationTRANSCRIPT
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 20061
LCLS Undulator Tuning
Zack Wolf, Yurii Levashov,
Achim Weidemann, Seva Kaplounenko,
Scott Jansson, Ralph Colon, Dave Jensen
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 20062
MMF Hardware Installation
FAC April 20, 2006 FAC October 12, 2006
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 20063
Undulator Work Flow
1 Week, Come to 20 C
1 Week, Rough Tuning
1 Week, Fine Tuning
<1 Week, FinishFiducialization
Peak Throughput: 1 undulator per week
Tuning Time:about 4 weeks
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 20064
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
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 20066
Rough Tuning Bench
CamMovers
Cable Handling Bench
UndulatorReference Pole
Zero Gauss Chamber
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 20067
Capacitive Sensor Alignment Performance
Undulator mechanically aligned to bench in 15 minutes
Yurii Levashov
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 20068
Scans Begin And End In A Zero Gauss Chamber
Beginningzero fieldmeasurement
Endingzero fieldmeasurement
Senis Hall probe
Zero Offset CorrectionAssume linear offset dependence on time
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 20069
Y Trajectory Shims
X-field vs. X-position
-0.004
-0.003
-0.002
-0.001
0
0.001
0.002
0.003
0.004
0.015 0.02 0.025 0.03 0.035 0.04
meters
T
Bx ShimNew Design
Smaller external fieldsUniform Bx field in gap
Yurii Levashov
Inconel
SteelSpot weld
OldShim
Design
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200610
Rough Tuning Test Plan1) Place undulator
Use kinematic mount2) Mechanically align to test stand
Optical alignment check, use capacitive sensors and cam movers3) Magnetically align Hall probe to undulator
Move Hall probe in x and y to magnetic center4) Rough tuning
Tune x and y trajectories, anticipate magnetic shield5) Adjust gap
Measure K, adjust gap to set K to required value for that undulator6) Check alignment
Alignment may have changed from gap adjustment7) Rough tuning
Anticipate magnetic shield8) Add magnetic shield9) Check tuning
Achim Weidemann
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200611
Each Undulator Has Its Own K Value
From Heinz-Dieter Nuhn
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200613
Fine Tuning Bench
Kugler Bench
Cable Handling
Steel GirderAnd Stands
Cam Movers
UndulatorWith MagneticShield
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200614
Kugler Bench Performance
Measurements by Georg Gassner
X Y straightness spec: < 14 μmPitch and yaw spec: < 4.2 μrad
Specs met in long block region
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200615
Coils For Fine Tuning Bench
Field Integral Coil
Short Coil Zero Gauss Chamber
Dave Jensen
Bx, By One Undulator Period Long Coils
I1
I2
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200616
Fine Tuning Test Plan1) Place undulator Use kinematic mount, use steel girder and stands, shield on2) Mechanically align to test stand
Optical alignment check, use capacitive sensors and cam movers3) Magnetically align Hall probe to undulator
Move Hall probe in x and y to magnetic center4) Determine the tuning axis Move in x to where K has the required value5) Tuning Tune x and y trajectories, phase6) Add phase matching shims7) Adjust field integrals Use long coil, I1 and I2 for both Bx and By8) Adjust field uniformity Add quadrupole and sextupole shims as necessary9) Final checks before gluing shims Check x and y trajectory, phase, phase matching, field integrals, uniformity
Yurii Levashov
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200617
Fine Tuning Test Plan (cont.)10) Glue shims in place Remove y trajectory, quadrupole, sextupole, and phase shims, apply glue, replace11) Check the gap
Make sure no parts of a shim protrude into the gap12) Check for errors while gluing shims
Check x and y trajectories, phase, I1 and I2 of Bx and By, uniformity13) Map Bx and By in the retracted position14) 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 scans15) Find the x position, y=0, where K has the required value16) Add fiducialization magnets to both ends Measure offsets from beam axis to the center of the fiducialization magnets17) Rough fiducialization using alignment equipment18) Measure roll on flats at each undulator end19) Move undulator to CMM, finish fiducialization
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200619
Hall Probe Calibration
SENIS 24-06
-50
-40
-30
-20
-10
0
10
20
30
40
50
-10 -8 -6 -4 -2 0 2 4 6 8 10
Voltage (V)
Fie
ld-0
.2*V
olt
age
(G)
SENIS 24-06
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
-10 -8 -6 -4 -2 0 2 4 6 8 10
Voltage (V)
Fie
ld (
T)
ChillerFor probetemperature
Magnet
Water NMR
MetrolabNMR
HP3458
Seva Kaplounenko
Zachary Wolf
Undulator Tuning [email protected]
Oct 12, 200621
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.