Undulator Tuning Status

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


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

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November 12, 20083

Undulator Quadrupoles FinishedScott Anderson(Detailed report in preparation)

NoOutliers

No Tolerance(individual supplies)

No Tolerance

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November 12, 20084

Undulator Quadrupoles Finished

Absolute Value Of Magnetic Center Shift In BBA Cycle

Tolerance3 microns

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November 12, 20085

Undulator Quadrupoles Finished

Difference Between Magnetic And Mechanical Centers

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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

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November 12, 20087

Transportation Test

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November 12, 20088

Transportation Test

ConclusionNo significant changes occurred tothe undulator during the transportationtest.

Zachary Wolf


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

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November 12, 200810

Bldg 750 Temperature

20 C

~11 C

Temperature

~9 C

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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

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November 12, 200812

Building 750 Undulator Changes

x-trajectory, y-trajectory,phase errors, all ok

But

The fiducializationchanged by 200 microns

in x

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November 12, 200813

Building 750, 3 Undulators

Zachary Wolf


November 12, 200814

Building 33 TemperatureJ. Chan

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November 12, 200815

Building 33 Gap Changes

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November 12, 200816

Building 81 Storage Area Temperature

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November 12, 200817

Building 81 Storage, Gap Changes

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November 12, 200818

Building 81 Lab, Gap Changes

T = 20 ± 0.1 C

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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

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November 12, 200820

Trajectories And Phase Are OK

Undulator 39Went through all temperature excursions.Trajectories: no significant changePhase Errors: added ~1° rms

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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.

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November 12, 200822

Tuning Work

• Repair undulators• Fix shim interferences• Re-tune• Re-fiducialize

A. Weidemann, Y. Levashov,E. Reese

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November 12, 200823

Two areas to replace shims

130µm

Ed Reese

RepairsBefore repair

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November 12, 200824

50µm

Ed Reese

After Repair

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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

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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


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.)

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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

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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

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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.)

Undulator Tuning Status

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