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Zack Wolf Undulator Magnetic Measurements [email protected]. edu April 11, 2006 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

Zack Wolf Undulator Magnetic [email protected] April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

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Page 1: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

LCLS UndulatorMagnetic Measurements

Zack Wolf,

Scott Anderson, Ralph Colon, Brendan Dix, Scott Jansson, Dave Jensen, Luis Juarez,

Seva Kaplounenko, Yurii Levashov,

Wei Wang, Achim Weidemann

Page 2: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

Undulator Tuning, General Approach

Use ANL and DESY experience Techniques have been developed at ANL and

DESY which work very well. We will use the best of the ANL and DESY

measurement techniques as our starting point (both have been very generous in sharing with us).

We need to adapt for production measurements.

Page 3: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

SLAC Magnetic Measurement Facility

Floor plan divided into three functional areasMagnetic Measurements (± 0.1º C)Fiducialization and Assembly (± 1º C)Storage (± 2.5º C)

Test stand lay-out is driven by requirement to match the Earth Magnetic Field conditions in lab to Undulator Hall, i.e. azimuth and gap orientation need to be identical

LCLS-TN-04-1

Page 4: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

MMF Under Construction

Photos courtesy of Javier SevillaBeneficial occupancy in March

Page 5: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

Important Dates

MMF Major Construction Finished Feb. 17, 2006MMF Beneficial Occupancy March 6, 2006Kugler Bench Complete April 15, 2006Kugler Bench At SLAC May 15, 2006Kugler Bench Handover To SLAC June 15, 20061st Article Arrives At SLAC July 2, 2006MMF Ready For Measurements July 28, 2006Production Measurements Start August 29, 2006

(Approximate)

Page 6: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

Undulator Measurement Benches

Ste e l Be lt

C a rria g e

Ha ll Pro b eX Y Sta g e

Ro ll Sta g e ,G o nio m e te r

G ra nite Ta b le

Line a r M o to r

C a rria g e

Ha ll Pro b eX Y Sta g e

Ro ll Sta g e ,G o nio m e te r

G ra nite Ta b le

ANL Bench DESY Bench

LCLS-TN-03-7

Goal: Move probes along a very straight line through the undulator.

Page 7: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

Kugler Bench

On order, expected at SLAC May 15, 2006. Ready for use June 15, 2006.

Page 8: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

SLAC Software Development Bench

Bench software by Seva Kaplounenko

(While we waiton the Kuglerbench)

Page 9: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

Undulator Measurement Steps1) Place undulator2) Mechanically align undulator to bench3) Magnetically align Hall probe to undulator4) Perform any required large gap adjustments and re-align5) Straighten the X and Y trajectories6) Minimize phase errors7) Perform phase matching8) Determine K vs X, move probe to the X value which gives

the specified K9) Add fiducialization magnets to undulator ends, locate

center of fiducialization magnets10) Move undulator to CMM, finish fiducialization

LCLS-TN-03-7

Page 10: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

1) Place Undulator

Ben Poling placing the ANL prototype on the SLAC prototype bench 12/9/05.

Page 11: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

1) Place Undulator

Page 12: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

1) Place Undulator

Built by Gordon Bowden, Yurii Levashov, Scott Jansson

SLAC CAM Movers

Brake

Motor

HarmonicDrive

Cam PotentiometerBearing

Bearing

Page 13: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

2) Mechanically Align to BenchUse Capacitive Sensors

We tested capacitive sensors in TTF undulators at DESY

Yurii Levashov

Page 14: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

2) Mechanically Align To Bench

Undulator aligned to fixed height of reference pole.

Page 15: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

2) Mechanically Align to Bench

Use 6 capacitive sensors on an arm Gives x, yaw, y, pitch, and roll Have reference poles at each end Calibrate sensors with micrometers

Previous experience from PEP II and SPEAR III

Page 16: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

3) Magnetically Align Hall Probe

By

y

By

x

By

Technique Every N’th pole, move probe vertically, find minimum Every N’th pole, move probe horizontally, find midpoint between edges Plot (x, y) vs z, fit for magnetic alignment

x

y

Page 17: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

3) Magnetically Align Hall Probe

SLAC Measurements

Page 18: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

4) Perform Any Large Gap Adjustments

ANL TB-48

Tapered Shim

Page 19: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

5) Straighten X And Y Trajectories

LCLS-TN-05-5

Simultaneously measureBx and By (Hall)

and Bx from a coil

Page 20: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

5) Straighten X And Y Trajectories

Apply shims to top and bottom poles Shims weaken By, don’t cause Bx Can’t strengthen pole, instead place

shims on next pole to reduce deflection in other direction

Developing software to try to automate shim placement

ANL/APS/TB-48

LCLS-TN-04-7

ANL/APS/TB-48

Isaac Vasserman’s Ideas

Page 21: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

5) Straighten X And Y Trajectories

MeasuredX

Trajectory

CalculateShims

ModeledX TrajWithCalc

Shims

MeasuredX Traj

After CalcShimsApplied

Automate Shimming, Under Development

Page 22: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

5) Check Hall Probe Field Integrals

150 Turns

I1 I2

Long CoilLCLS-TN-05-22

Page 23: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

5) Earth’s FieldLCLS-TN-05-4

We will eithera) Measure the field integrals and shim in the tunnelb) Put a mu-metal shield around the undulators (Isaac Vasserman)

Page 24: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

6) Minimize Phase ErrorsPoles 51 and 52 are 1% too

strong. A magnet which is too strong can cause phase errors. The trajectory is shifted, but there is no residual slope. Correct with phase shims. LCLS-TN-04-7

MeasuredPhaseErrors

CalculatedShims

Under development

Page 25: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

6) Minimize Phase Errors

Measure By with a Hall probe Calculate phase error Calculate shims to correct error Apply shims, repeat

Developing software to automate shim placement

ANL/APS/TB-48LCLS-TN-04-7

We don’t have shims to strengthen a magnet, only weaken Must locally reduce the gap to increase phase shift

Page 26: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

7) Phase Matching

Phase Matching Shim Data

Entrance:Number of end poles = 5Measured 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 degEntrance phase error (from pole 6) = -12.03 degEntrance phase match shim dimension = 0.0000e+000 m

Program provides shim information

(under development)

pi pi/2pi/2 (mod 2pi)

Page 27: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

8) Determine K vs XSinusoidal Field

K XK0

Canted Poles

K vs X

LCLS-TN-04-7

Set the probe position to give the nominal K value.

K Shim DataMeasured K value = 3.627747Desired K value = 3.500000Required field change dB / B = -3.6499e-002Required gap change dgap = 2.1330e-004 mBeam x motion required dx = 4.7401e-002 m

Analysis Program Gives K For Each X RunCalculated Undulator Parameters:Keff = 3.627747Beff = 1.295076 TLambda_rad = 1.595811e-010 m

X0(prototype)

(under development)

Page 28: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

9) Add Fiducialization MagnetsNeed to relate magnetic field to tooling balls.

Attach to undulator ends, measure offsets

LCLS-TN-05-10

Yurii Levashov

Page 29: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

10) Move to CMM, Finish Fiducialization

Want DD1 : Magnetic MeasurementD2 : CalibrationD3 : CMM

D = D1 + D2 + D3

Page 30: Zack Wolf Undulator Magnetic Measurementswolf@slac.stanford.edu April 11, 2006 LCLS Undulator Magnetic Measurements Zack Wolf, Scott Anderson, Ralph Colon,

Zack Wolf

Undulator Magnetic Measurements [email protected]

April 11, 2006

Conclusion

•Our group’s next big magnetic measurement project is the LCLS.

•A new magnetic measurements lab is being built.

•We will use Hall probes and coils to tune the undulators.

•Long coils will check the first and second field integrals.

•High gradient magnets with well defined centers will be used to fiducialize the undulators.

•Algorithms are being developed to automate shimming.