1. The Storage Ring Control Network of NSLS-II
C. Yu, F. Karl, M. Ilardo, M. Ke, C. Spataro, S. Sharma

2. Survey Networks Overview Error Estimate Measurement Results
Outline
Project Overview
Survey Networks Overview
Error Estimate
Measurement Results
The Use of the Control Network
Conclusion

3. Project Overview-Storage Ring
Very broad spectral coverage
Far-IR through very hard x-rays
Very high brightness
> 1021 p/s/0.1%/mm2/mrad2 from ~ 2 keV to ~ 10 keV
Very high flux
> 5x1015 ph/s/0.1%bw from ~ 500 eV to ~ 10 keV
Very small beam size
óy = 2.6 ìm, óx = 28 ìm
ó’y = 3.2 ìrad, ó’x = 19 ìrad
Top-off operation
Current stability better than 1%
Design Parameters
• 3 GeV, 500 mA, top-off injection
• Circumference m
• 30 cell, Double Bend Achromat
• 15 long straights (9.3 m)
• 15 short straights (6.6 m)
Novel design features:
• damping wigglers
• soft bend magnets
• three pole wigglers
• large gap IR dipoles
Ultra-low emittance
• åx, åy = 0.6, nm-rad
• Diffraction limited in vertical at 10 keV
Pulse Length (rms) ~ 15 psec
Commissioning went well.
Approved to Start Routine Operations on September 22, 2014
Magnet and Integration Status Report 3

5. NSLS-II Construction and Primary Survey Network
M0 and M1 are shared. 5

6. NSLSII Secondary Network
LINAC tunnel and its outerside area ~90
Booster tunnel ~120
Storage ring ~1000
Experimental area >1000(to be added)

7. Storage Ring Control Network Design
Global alignment tolerance +/-3 mm
Relative girder alignment tolerance +/-0.1mm
Girder profiling requirement +/-10 micron
Monitoring requirement
Beamline alignment
Laser tracker + Level
AT401 Laser tracker
Level to establish elevation control
Internal level
Good angular precision
High efficiency

8. Storage Ring Control Network Simulation
Laser tracker, 2.0 arc-second’s accuracy for horizontal and vertical angle, and 25µm+2.5µm/m for distance

9. Storage Ring Control Network Layout and Observation
The monument, instrument and observations of NSLS-II control network in one cell out of 30.
Takes 3 weeks by 1 crew or 1 week by 3 crews.
Measured around twice a year in project stage.

10. Adjustment by Spatial Analyzer
Statistics of USMN
Name
Value
Unit
Point Error
RMS
0.024 mm
Average
0.015
Max
0.255
Instrument accuracy
Horizontal Angle
0.894
"
Vertical Angle
0.734
Distance
0.014
Count
Measurements
4747
Instruments
191
Attention:
Make sure AT401 is leveled during the solving process to maintain the level information.
Benefits:
USMN can provide an optimal solution to all the instruments and monuments
Seamless from data collecting to generating control network result
Questionable observations can be easily disregarded.
Global accuracy:
The coordinate differences between the 5 common monuments of primary and secondary control network are below ±1 mm.

11. Comparison with Star*Net
Statistics of Star*net
Coordinate deviation between Star*net and SA
Name
Value
Note
Average absolute
Semi-Major Axis
0.606
For all the monuments
Semi-Minor Axis
0.219
Elevation
0.030
Average relative
0.041
For 39 points with an average distance of meter
0.019
0.016
Name
Value
Note
Coordinate deviation
RMS X
0.036
For all the monuments
RMS Y
0.034
RMS Z (elevation)
0.004
Feed the raw data used by Spatial Analyzer to Star*Net.
The posterior instrument angular and distance accuracy estimate is initially used.
Good coordinate consistency between the two. Therefore, Spatial Analyzer is used as a substitute of Star*Net for control network adjustment in NSLS-II project.

12. Changes between Epoch 6 and 7
Horizontal
Vertical

13. Use for Girder Alignment
Girder name
Deviation between 2 and 6 tracker setup
6 tracker setup
RMS deviation of monuments
Count DX DY DZ
C06G2
-0.007
0.002
0.046
0.023
0.036 21
C06G4
0.001
0.003
0.044
0.024
0.039 26
C06G6
-0.01
-0.001
0.029
0.016
0.022 13
C07G4
-0.002
0.007
0.028 19
C07G2
-0.013
-0.02
0.027
0.025
0.019 17
C07G6
-0.008
0.017
0.021 14
Control network fitting error DX DY DZ
ROLL
PITCH
YAW
RMS
0.031
0.026
0.099
0.033
0.004
0.014
MAX
0.071
0.079
0.243
0.107
0.007
0.042
MIN
-0.066
-0.031
-0.372
-0.089
-0.010
-0.059
Multipole girder positional and rotational deviations. (Unit: millimeter for location and millirad for rotation)

14. Use for Girder Profiling
Bring instruments together
Profiling result

15. Summary
The substitution of instrument from traditional laser tracker and digital level to AT401 is a success in NSLS-II project. It shows improved measurement efficiency and precision. The local accuracy is better than ±0.050 mm and global accuracy is better than ±1 mm.
Spatial Analyzer is convenient and reliable to be used for the computation of control network. It has comparable result with respect to traditional software.
The combination of AT401 and Spatial Analyzer has promising prospect in accelerator control network survey.

16. Acknowledgment
The authors would like to thank all the staff who involved in the establishing and maintaining of the high precision NSLS-II control network.

17. Thanks for your attention!