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Undulator Tuning Status. Z. Wolf, S. Anderson, R. Colon, S. Jansson, D. Jensen, S.Kaplunenko, Y. Levashov, Ed. Reese, A. Weidemann. Undulator Tuning And Related Topics. Overview Undulator quadrupoles Transportation test Temperature “tests” Repairs Shim-beampipe interference fix - PowerPoint PPT Presentation
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Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 20081
Undulator Tuning Status
Z. Wolf, S. Anderson, R. Colon, S. Jansson, D. Jensen,
S.Kaplunenko, Y. Levashov, Ed. Reese, A. Weidemann
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 20082
Undulator Tuning And Related Topics
Overview• Undulator quadrupoles • Transportation test• Temperature “tests”• Repairs• Shim-beampipe interference fix• Re-tuning status/schedule• Tunnel field map• Reference undulator
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 20083
Undulator Quadrupoles FinishedScott Anderson(Detailed report in preparation)
NoOutliers
No Tolerance(individual supplies)
No Tolerance
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 20084
Undulator Quadrupoles Finished
Absolute Value Of Magnetic Center Shift In BBA Cycle
Tolerance3 microns
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 20085
Undulator Quadrupoles Finished
Difference Between Magnetic And Mechanical Centers
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 20086
Transportation TestDetails in LCLS-TN-08-9
Route
Outside and undulator temperatures
Undulator temperature rise 1° F (0.6 C)
During test
D. Kharakh, Y. Levashov,N. Horton, Y. Levashov,
E. Reese
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 20088
Transportation Test
ConclusionNo significant changes occurred tothe undulator during the transportationtest.
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 20089
Temperature “Tests”Details in LCLS-TN-08-8
Undulator StorageTlab = 20 ± 0.1 CBuilding 750, 18 undulators , T = 11 C, 3 checkedBuilding 33, 6 undulators , T = 27 C, 2 checkedBuilding 81 storage, 5 undulators , T = 20 ± 2 C, 1 checkedBuilding 81 laboratory, 1 undulator, T = 20 ± 0.1 C
ProblemThe undulator fiducialization changed.Examples to follow.
Y. Levashov, E. Reese
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200810
Bldg 750 Temperature
20 C
~11 C
Temperature
~9 C
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200811
Building 750 Gap Change
1 micron averagegap change
Gap changeduring storage
Field changes agreewith gap changes
CMM Hall probe
Pole sub-assemblylength
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200812
Building 750 Undulator Changes
x-trajectory, y-trajectory,phase errors, all ok
But
The fiducializationchanged by 200 microns
in x
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200813
Building 750, 3 Undulators
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200814
Building 33 TemperatureJ. Chan
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200816
Building 81 Storage Area Temperature
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200817
Building 81 Storage, Gap Changes
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200818
Building 81 Lab, Gap Changes
T = 20 ± 0.1 C
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200819
Temperature Fiducialization Change Summary
T = 11 C
T = 20 ± 2 C
T = 27 C
T = 20 ± 0.1 C
err = 50 μm
err = 0.7 μm
err = 0.2 μm
err = 7 μm
For ∆K/K = 1.5 × 10-4
∆xmax = 195 μm∆ymax = 83 μm∆gmax = 0.9 μm
ConclusionTemperature excursions permanentlychange the undulator fiducialization.
Undulator 39
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200820
Trajectories And Phase Are OK
Undulator 39Went through all temperature excursions.Trajectories: no significant changePhase Errors: added ~1° rms
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200821
Storage Problem Summary
The undulators in bldgs 750 and 33 must be re-fiducialized.The trajectories and phases are ok.The average gap changed by about 1 micron.The magnetic axis shifted by about 200 microns in x.200 microns → ∆K/K ≈ 1.8 × 10-4
Tolerance ∆K/K = 1.5 × 10-4
Bldg 750re-measuredundulators
All finished undulators are presently stored in the MMF. A recent air conditionershutdown does not appear to have damaged them.
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200822
Tuning Work
• Repair undulators• Fix shim interferences• Re-tune• Re-fiducialize
A. Weidemann, Y. Levashov,E. Reese
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200823
Two areas to replace shims
130µm
Ed Reese
RepairsBefore repair
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200824
50µm
Ed Reese
After Repair
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200825
X-Trajectory Shim Interference Fix
X-trajectory shim
Cut material off
• X-trajectory shims limit vacuum chamber “in”-motion to 2.5mm• Undulators tuned for ±6 mm• Shims to be modified to allow - 6mm motion and • Undulator tuning to be checked
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200826
Y-Trajectory Shim Interference FixBx vs. X
0
10
20
30
40
50
60
70
80
90
22 24 26 28 30 32 34 36
X(mm)
Bx(
G)
New shim
Old shim
Old
New
Fix, new triangles on old strongback
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200827
Schedule
Yellow items are done.Three undulators still need repair.Eleven undulators have shims replaced, are re-tuned and re-fiducialized.Two have feet and are RFI. (The CMM has been tied up with girders.)
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200828
Average Field On Each Girder In The TunnelS. Anderson, J. Welch
By bench
By tunnel
By limit
Shield Atten = 1/6Pole Amplif = 2.4
By limit
From I2y limit forconstant field:∆Bgap
max = 0.09 G
∆Boutsidemax = 0.2 G
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200829
Reference magnet re-measurement
3.498200
3.498400
3.498600
3.498800
3.499000
3.499200
3.499400
Apr-07 Aug-07 Nov-07 Feb-08 Jun-08 Sep-08 Dec-08
Date
K a
t a
ve
rag
e x
po
sit
ion
Reference Undulator
K is tuned to the same value each time, Knom = 3.498623K is adjusted for temperature and X-position. (All errors included in the plot.)R.M.S. = 1.1 × 10-4
Re-tuning starts
Zachary Wolf
Undulator Tuning Status [email protected]
November 12, 200830
Conclusion
Undulator quadrupole measurements are done.A transportation test showed no undulator changes from handling.Temperature excursions produce permanent undulator fiducialization changes.The magnetic field in the tunnel is within the range of the magnetic shield except at a few girders.Three undulators still require repairs.Re-tuning is roughly 1/3 done.Adequate undulator storage is still a problem. (The tunnel is our “planned” solution.)