LCLS Undulator Magnetic Measurements. Zack Wolf, Scott Anderson, Ralph Colon, Brendan Dix, Scott Jansson, Dave Jensen, Luis Juarez, Seva Kaplounenko, Yurii Levashov, Wei Wang, Achim Weidemann. Undulator Tuning, General Approach. Use ANL and DESY experience
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LCLS UndulatorMagnetic Measurements
Scott Anderson, Ralph Colon, Brendan Dix, Scott Jansson, Dave Jensen, Luis Juarez,
Seva Kaplounenko, Yurii Levashov,
Wei Wang, Achim Weidemann
Photos courtesy of Javier Sevilla
Beneficial occupancy in March
MMF Major Construction FinishedFeb. 17, 2006
MMF Beneficial OccupancyMarch 6, 2006
Kugler Bench CompleteApril 15, 2006
Kugler Bench At SLACMay 15, 2006
Kugler Bench Handover To SLACJune 15, 2006
1st Article Arrives At SLACJuly 2, 2006
MMF Ready For MeasurementsJuly 28, 2006
Production Measurements StartAugust 29, 2006
Goal: Move probes along a very straight line through the undulator.
On order, expected at SLAC May 15, 2006. Ready for use June 15, 2006.
(While we wait
on the Kugler
Bench software by Seva Kaplounenko
Ben Poling placing the ANL prototype on the SLAC prototype bench 12/9/05.
SLAC CAM Movers
Built by Gordon Bowden, Yurii Levashov, Scott Jansson
Use Capacitive Sensors
We tested capacitive sensors in TTF undulators at DESY
Undulator aligned to fixed height of reference pole.
Previous experience from PEP II and SPEAR III
find midpoint between edges
Bx and By (Hall)
and Bx from a coil
Isaac Vasserman’s Ideas
Automate Shimming, Under Development
Poles 51 and 52 are 1% too strong.
a magnet, only weaken
increase phase shift
Program provides shim information
Phase Matching Shim Data
Number of end poles = 5
Measured Phase At The Entrance Poles:
(Phase = 0 at the entrance cell boundary.)
Pole Number = 1 2 3 4 5 6
Phase (deg) = 393.80 436.28 624.41 811.05 986.83 1157.97
Expected phase at pole number 6 = 1170.00 deg
Entrance phase error (from pole 6) = -12.03 deg
Entrance phase match shim dimension = 0.0000e+000 m
Analysis Program Gives K For Each X Run
K vs X
Calculated Undulator Parameters:
Keff = 3.627747
Beff = 1.295076 T
Lambda_rad = 1.595811e-010 m
K Shim Data
Measured K value = 3.627747
Desired K value = 3.500000
Required field change dB / B = -3.6499e-002
Required gap change dgap = 2.1330e-004 m
Beam x motion required dx = 4.7401e-002 m
Set the probe position to give the nominal K value.
Need to relate magnetic field to tooling balls.
Attach to undulator ends, measure offsets
D1 : Magnetic Measurement
D2 : Calibration
D3 : CMM
D = D1 + D2 + D3