Transcript Delta quadrant tuning.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.
2
Tuning procedure outline
1. Initial magnet alignment using CMM to ±50m from the beam axis.
2. 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)….
3
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
4
Set-up on measurement bench
6 threaded inserts
2 dowel pin
holes
Granite block
Alignment table
Thermistors
Hall probe
Micrometer
5
Alignment to the bench (X & yaw)
B (T)
By vs probe X position
1.
2.
3.
4.
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
X (m)
0.024
0.026
0.028
0.03
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.
6
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%
7
Trajectories (#3)
I1Y = -351µTm
I2Y = -281µTm2
I1X = +738 µTm
I2X = +479µTm2
-6
2
X Trajectory
x 10
5
18
30
-6
43
55
Pole
2
1
1
0.5
0.5
0
30
43
55
0
0.2
Z position (m)
0.4
Pole
0
I1X = +1 µTm
I2X = -8 µTm2
-1
-1
-2
-1
18
-0.5
-0.5
-1.5
5
1.5
Y (m)
X (m)
1.5
Y Trajectory
x 10
I1Y = +5µTm
I2Y = +5µTm2
-0.8
-0.6
-0.4
-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
8
Phase Errors (#3)
Phase Error At Field Peaks, No Ends
6
5
11
18
24
30
36
43
49
55
0.1
0.2
0.3
0.4
Pole
4
2
Phase Error (deg)
R.M.S = 40 deg.
After tuning the trajectories the R.M.S. phase error
goes down to 1015 deg.
The rest is tuned out by virtual shimming.
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
0.5
9
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%)
10
Final CMM Measurement results
Maximum deviation from center line is:
-69 m in X and +37m in Y
11
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.
12
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.
13
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.
14
Back-up slides
Field superposition, Linear Vertical
Field superposition, Linear Horizontal
Field superposition, Circular left