Transcript

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Undulator Tuning Status

Z. Wolf, S. Anderson, R. Colon, S. Jansson, S.Kaplunenko,

Y. Levashov, Ed. Reese, R. Ruland, A. Weidemann

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Outline

Undulator quadrupole measurements and fiducialization

Undulator tuning and fiducializationProblems

Repairs

Extend K Adjustment Range

Schedule

Reference undulator measurements

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Undulator Quadrupoles

Strength And HarmonicsRotating Coil System

FiducializationVibrating Wire System

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Integrated Gradient (normalized)

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Harmonics n = 3, 4, 6, & 10

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

BBA center shift for +/- 1 amp around +/- 4.3 Amps

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Quadrupole Measurements

25 Undulator Quads measured with the rotating coil.

Final Magnet June 26th.

17 Undulator quads fiducialized to their magnetic center.

Final magnet June 30th.

TolerancesIntegrated gradient: no tolerance, measure transfer function, individual suppliesHarmonics: no tolerance, small beam size, looking for big problemsBBA center shift: ±3 microns, need to look at outliers, also change energy for BBA

So far, all quadrupoles seem acceptable. Closer look at BBA outliers required.

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Undulator Tuning And Fiducialization

Overview• The tuning is going well• Almost done with 33 (details to follow)• Mounting feet standardization is progressing• Problem with storage, need to re-fiducialize 15 undulators• Repairs of un-tunable undulators have started• Recent plan to increase K adjustment range• The measurements look good Stable, low noise, … Hall probe, short coil, long coil measurements agree The reference undulator measurements are stable

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Done (6) (in Bldg. 33)

Ready for feet (5) (in MMF)

To be re-fiducialized (15)(in Bldg. 750)

To be tuned (2)

To be repaired (8)

At Argonne (2)

Undulator MeasurementStatus

(5/14/08)

Undulator Measurement Status Update (6/17/08)32 through rough tuning31 through fine tuning2 are repaired2 are RFI (new shims)

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Re-measure After Storage

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

But

The fiducializationchanged by 200 microns

in x

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Bldg 750 Temperature

20 C

~11 C

Temperature

~9 C

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Storage Temperature Gap Change

1 micron averagegap change

Gap changeduring storage

Field changes agreewith gap changes

CMM Hall probe

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Storage Problem Summary

The undulators in bldg 750 should 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

Bldg 33 “data point” in process.

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Two areas to replace shims

130µm

Ed Reese

Repairs RequiredBefore repair

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

50µm

Ed Reese

After Repair

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

New: Extend K Adjustment Range

• Originally, only ±2.5 mm good field region could be achieved• Originally, ±2.5 mm horizontal adjustment range required, but a larger range was desired• New Bx shims allow ±6 mm horizontal good field region• Now we want to extend undulator horizontal adjustment range• Need to solve beam pipe clearance problems

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Interference with vacuum chamber

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]

June 17, 2008

-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5-2

-1

0

1

2x 10

-6 X Trajectory; shims machined

X (

m)

Z position (m)

13 46 80 113 146 180 213 Pole

-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5-2

-1

0

1

2x 10

-6 X Trajectory; before shim modification

X (

m)

Z position (m)

13 46 80 113 146 180 213 Pole

X trajectories

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Interference with vacuum chamber. ContinuedBx 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]

June 17, 2008

Y trajectories

-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5-2

-1.5

-1

-0.5

0

0.5

1

1.5

2x 10

-6 Y Trajectory; old shimsY

(m

)

Z position (m)

13 46 80 113 146 180 213 Pole

-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5-2

-1.5

-1

-0.5

0

0.5

1

1.5

2x 10

-6 Y Trajectory; new shims

Y (

m)

Z position (m)

13 46 80 113 146 180 213 Pole

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

X field integrals First X field integral change

-50-40-30-20-10

0102030405060

-8 -6 -4 -2 0 2 4 6 8

X position from center (mm)

I 1x

(mic

ro T

m)

I1x (new shims)

I1x (old shims)

Second X field integral change

-125-100-75-50-25

0255075

100125150

-8 -6 -4 -2 0 2 4 6 8

X position from center (mm)

I 2x

(mic

ro T

m2)

I2x(new shims)

I2x(old shims)

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

New RFI ScheduleGeneral Plan(my view)1) While we are waiting to installthe undulators, we can re-fiducializeand fix the clearance problemsaccording to this schedule. We startnear the end and work backwards.2) If commissioning is going well, wecan install any remaining undulators“as-is”. a) The motion range will be restricted, but at the beginning where it is not as important. b) K may be slightly out of tolerance for the first few undulators. We can correct assuming bldg 750 undulators behave similarly. c) We can swap them and fix them after the machine is running.3) This is in line with the Lehmancommittee’s desire to get the machinerunning without additional delays.

*

* Undulator commissioning starts

#

# Beam line commissioning starts

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Reference undulator

K is tuned to the same value each time.K is adjusted for temperature and X-position. (All errors included in the plot.)R.M.S. = 910-5

Reference magnet re-measurement

3.4980

3.4985

3.4990

3.4995

Mar-07 Apr-07 Jun-07 Aug-07 Sep-07 Nov-07 Jan-08 Feb-08 Apr-08 Jun-08

Date

K

Probe re-calibrated

Ktarget=3.498632

Problem with probe calibration*

* Z. Wolf “Undulator tuning and fiducialization schedule”. FAC Meeting, April 2007

Zachary Wolf

Undulator Tuning Status [email protected]

June 17, 2008

Conclusion

Undulator quadrupole measurements are nearing completion.Production measurements of 33 undulators is nearly complete. New work has started.MMF throughput averaged 2 devices/month.Repairs of un-tunable undulators has started.Tuning accuracy is within the tolerances.The K adjustment range will be increased.Due to interference with the vacuum chamber in off-axis position, X and Y trajectory shims will be modified/replaced on all undulators. The undulators will be re-measured and re-fiducialized and have their shims replaced.Undulator Status

32 undulators went through rough tuning31 undulators went through fine tuning2 undulators are repaired2 undulators RFI (with shims replaced)1 undulator back from bldg 33, new temperature excursion test


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