Transcript Delta quadrant tuning_old.pptx

DELTA Quadrant Tuning
Y. Levashov
E. Reese
Tolerances for prototype quadrant tuning
The undulator can not be tuned when assembled.
Each magnet array was tuned individually then mounted on a quadrant actuator plate.
Parameter
Assembled Undulator
Quadrant
K
>3.4853 (Slot 33)
>1.2323 (± 110-3 )
Phase error R.M.S.
<10°
< 3°
First field Integrals
< 40 Tm (40 G-cm)
< 10 Tm (10 G-cm)
Second field Integrals
< 50 Tm2 (5000 G-cm2)
< 10 Tm2 (1000 G-cm2)
Magnet center deviations from a nominal center line < ± 50 m in X and <+50 m in Y.
Tuning procedure outline
Initial magnet alignment using CMM to ±50 m from the beam axis.
Tuning with iterations based on virtual shimming(re-positioning the magnets
w.r.t. magnetic axis).
Round 1:
- Tune trajectories and phase errors with the use of CMM data.
- Measure K
- Check magnet positions on CMM.
Round 2:
- Correct magnet positions to be within ±50 m from the beam line.
- Continue tuning trajectories and phase errors with the use of CMM data.
- Set K-value as close as possible to the average from Round 1.
- Check magnet positions at CMM.
Round 3:
- Correct magnet positions to be within ±50 m from the beam line.
- Do final adjustments to trajectories, phase errors, and K.
- Check magnet positions at CMM.
Round 4(if necessary)….
CMM measurements
1. Measure dowel pin holes on the bottom. Transfer x – axis on the side of the plate.
2. Scan along the curve surface on each magnet, fit circle of 3.2mm radius, for each
magnet find x & y coordinates of the circle center.
3. Find deviations of magnet centers from the beam line in x and y.
Y
X
Beam axis
Shim for
Y- adjustments
Set screw for
X- adjustments
Dowel pin holes
Set-up on measurement bench
6 threaded inserts
2 dowel pin
holes
Granite block
Alignment table
Thermistors
Hall probe
Micrometer
Alignment to the bench (X & yaw)
B (T)
By vs probe X position
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0.012
0.014
0.016
0.018
0.02
0.022
0.024
0.026
0.028
0.03
X (m)
1.
2.
3.
4.
Do Hall probe scan in X at each pole location
Truncate data ± 3mm from center
Fit parabola, find center
Fit a straight line through all pole centers, find x and yaw, correct yaw
if necessary.
Alignment to the bench (Y)
Sight level
Granite
block
Fiducialization
fixture
Bottom of the magnet array bottom to beam line = 44.653mm (1.758”)
• Find center of fiducialization fixture with the Hall probe
• Measure difference in height between the fixture and the granite by optical tools
• Set Hall probe Y using bench vertical stage
ΔY = 30μm  ΔB/B  1%
Trajectories (#3)
I1X = +738 µTm
I2X = +479µTm2
I1Y = -351µTm
I2Y = -281µTm2
-6
2
X Trajectory
x 10
5
18
30
-6
43
55
Pole
2
1.5
30
43
55
0
0.2
Z position (m)
0.4
Pole
0.5
Y (m)
X (m)
18
1
0.5
0
0
-0.5
-0.5
-1
-1
-2
-1
5
1.5
1
-1.5
Y Trajectory
x 10
I1Y = +5µTm
I2Y = +5µTm2
-0.8
-0.6
-0.4
I1X = +1 µTm
I2X = -8 µTm2
-1.5
-0.2
0
0.2
Z position (m)
0.4
0.6
0.8
1
-2
-1
-0.8
-0.6
-0.4
-0.2
0.6
0.8
1
Phase Errors (#3)
After tuning the trajectories the R.M.S. phase
error goes down to 1015 deg.
The rest is tuned out by virtual shimming
Phase Error At Field Peaks, No Ends
6
5
11
18
24
30
36
43
49
55
0.2
0.3
0.4
Pole
4
2
Phase Error (deg)
R.M.S = 40 deg.
0
-2
-4
R.M.S = 2 deg.
-6
-8
-0.5
-0.4
-0.3
-0.2
-0.1
0
Z position (m)
Phase Error: Ave = 0.000000 deg, RMS = 2.278216 deg
0.1
0.5
Tuning results
DataSet 001
T
I1X
I2X
I1Y
I2Y
K
Ph.Err.RMS
Run #
Q1
20.2
+7
+2
-12
-4
1.3085
3.4
49
Q2
20.3
-8
-2
+8
+2
1.2986
5.0
58
Q3
20.4
-2
+6
-4
0
1.3322
3.4
70
Q4
20.2
-11
-14
+3
+12
1.3447
3.6
77
Q3
20.2
+5
+3
+2
+1
1.3347
2.5
26
Q4
20.2
-2
-3
-4
+3
1.3350
3.2
16
Q3
20.3
+1
-8
+5
+5
1.3327
2.3
11
Q4
20.1
+6
+2
-4
-1
1.3285
3.0
8
DataSet 002
T
I1X
I2X
I1Y
I2Y
K
Ph.Err.RMS
Run #
Q1
20.1
-3
+8
+1
0
1.3348
2.6
7
Q2
20.3
-4
0
0
-7
1.3346
3.1
23
DataSet 003
T
I1X
I2X
I1Y
I2Y
K
Ph.Err.RMS
Run #
Q1
20.2
-2
+6
-2
-6
1.3281
2.8
3
Q2
20.4
-4
-2
-2
-8
1.3297
3.1
6
(ΔK/K  +7%)
Final CMM Measurement results
Maximum deviation from center line is:
-69 m in X and +37m in Y
Issues for 3.2m device
• A special fixture is required to allow a quick accurate quadrant set-up on the
measurement bench, magnets facing up.
• The Hall probe has to be set at the same height for all quadrants with accuracy
better than 10m. Optical tools to be replaced by micrometers or Keyence sensor.
• Larger screws for magnet X adjustment.
• A provision to mount a micrometer to control magnet motion.
• Since vacuum chamber has no fins, magnet alignment tolerance in X direction
could be ± 100μm. It will reduce number of iterations.
Current Status
Retro-reflector
Hall probes
5mm ID, 6.3mm OD
copper tube
stage
1.2 m long G-10 rod
•
•
•
•
Measurement system for the 1m long prototype is in place and ready.
First measurements done to check the system.
Relative roll angles and displacements are measured for X and Y probes.
Prototype mechanical and controls’ issues to be solved before measurements
continue.
Conclusion
• Tuning procedure has been developed for DELTA quadrants.
• Four quadrants have been successfully tuned to tolerances in 12 days (3 days/quadrant).
• Simulations show that the assembled device should meet the tolerances.
• Measurements system for assembled prototype is in place and it’s functionality tested.
• Magnetic measurements are in progress.
Back-up slides
Field superposition, Linear Horizontal
Field superposition, Linear Vertical
Field superposition, Circular left