Transcript Undulator Tuning and Fiducialization Schedule

Undulator Tuning Status
Z. Wolf, S. Anderson, R. Colon, S. Jansson, S.Kaplunenko,
Y. Levashov, Ed. Reese, R. Ruland, A. Weidemann
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
Outline
Undulator quadrupole measurements and fiducialization
Undulator tuning and fiducialization
Problems
Repairs
Extend K Adjustment Range
Schedule
Reference undulator measurements
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
Undulator Quadrupoles
Strength And Harmonics
Rotating Coil System
June 17, 2008
Undulator Tuning Status
Fiducialization
Vibrating Wire System
Zachary Wolf
[email protected]
Integrated Gradient (normalized)
June 17, 2008
Undulator Tuning Status
Zachary Wolf
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Harmonics n = 3, 4, 6, & 10
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
BBA center shift for +/- 1 amp around +/- 4.3
Amps
June 17, 2008
Undulator Tuning Status
Zachary Wolf
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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.
Tolerances
Integrated gradient: no tolerance, measure transfer function, individual supplies
Harmonics: no tolerance, small beam size, looking for big problems
BBA 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.
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
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
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
Undulator Measurement
Status
Done (6) (in Bldg. 33)
(5/14/08)
Ready for feet (5) (in MMF)
To be re-fiducialized (15)
(in Bldg. 750)
Undulator Measurement
Status Update (6/17/08)
32 through rough tuning
31 through fine tuning
2 are repaired
2 are RFI (new shims)
To be tuned (2)
To be repaired (8)
At Argonne (2)
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
Re-measure After Storage
x-trajectory, y-trajectory,
phase errors, all ok
But
The fiducialization
changed by 200 microns
in x
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
Bldg 750 Temperature
20 C
~9 C
Temperature
~11 C
June 17, 2008
Undulator Tuning Status
Zachary Wolf
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Storage Temperature Gap Change
Gap change
during storage
1 micron average
gap change
CMM
June 17, 2008
Undulator Tuning Status
Field changes agree
with gap changes
Hall probe
Zachary Wolf
[email protected]
Storage Problem Summary
Bldg 750
re-measured
undulators
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 33 “data point” in process.
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
Repairs Required
Before repair
130µm
Two areas to replace shims
Ed Reese
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
After Repair
50µm
Ed Reese
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
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
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
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
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
X trajectories
X Trajectory; before shim modification
-6
2
x 10
13
46
80
113
146
180
213
-1.5
-1
-0.5
0
Z position (m)
0.5
1
1.5
Pole
X (m)
1
0
-1
-2
-2.5
-2
2.5
X Trajectory; shims machined
-6
2
2
x 10
13
46
80
113
146
180
213
-1.5
-1
-0.5
0
Z position (m)
0.5
1
1.5
Pole
X (m)
1
0
-1
-2
-2.5
-2
June 17, 2008
Undulator Tuning Status
2
Zachary Wolf
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2.5
Interference with vacuum chamber. Continued
Bx vs. X
90
80
New
70
Bx(G)
60
50
New shim
Old shim
40
30
20
10
Old
0
22
24
26
28
30
32
34
X(mm)
Fix, new triangles on old strongback
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
36
Y trajectories
Y Trajectory; old shims
-6
2
x 10
13
46
80
113
146
180
213
Pole
-1.5
-1
-0.5
0
Z position (m)
0.5
1
1.5
13
46
80
113
146
180
213
-1.5
-1
-0.5
0
Z position (m)
0.5
1
1.5
1.5
1
Y (m)
0.5
0
-0.5
-1
-1.5
-2
-2.5
-2
2.5
Y Trajectory; new shims
-6
2
2
x 10
Pole
1.5
1
Y (m)
0.5
0
-0.5
-1
-1.5
-2
-2.5
June 17, 2008
Undulator Tuning Status
-2
2
2.5
Zachary Wolf
[email protected]
X field integrals
I1x (micro Tm)
First X field integral change
-8
-6
-4
-2
60
50
40
30
20
10
0
-10 0
-20
-30
-40
-50
I1x (new shims)
I1x (old shims)
2
4
6
8
X position from center (mm)
I2x (micro Tm 2)
Second X field integral change
-8
-6
-4
-2
150
125
100
75
50
25
0
-25 0
-50
-75
-100
-125
I2x(new shims)
I2x(old shims)
2
4
6
8
X position from center (mm)
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
New RFI Schedule
General Plan
(my view)
1) While we are waiting to install
the undulators, we can re-fiducialize
and fix the clearance problems
according to this schedule. We start
near the end and work backwards.
2) If commissioning is going well, we
can 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 Lehman
committee’s desire to get the machine
running without additional delays.
#
*
# Beam line commissioning starts * Undulator commissioning starts
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
Reference undulator
Problem with probe calibration*
Reference m agnet re-m easurem ent
3.4995
Probe re-calibrated
K
3.4990
Ktarget=3.498632
3.4985
3.4980
Mar-07
Apr-07
Jun-07
Aug-07
Sep-07
Nov-07
Jan-08
Feb-08
Apr-08
Date
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. = 910-5
* Z. Wolf “Undulator tuning and fiducialization schedule”. FAC Meeting, April 2007
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]
Jun-08
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 tuning
31 undulators went through fine tuning
2 undulators are repaired
2 undulators RFI (with shims replaced)
1 undulator back from bldg 33, new temperature excursion test
June 17, 2008
Undulator Tuning Status
Zachary Wolf
[email protected]