1 BROOKHAVEN SCIENCE ASSOCIATES

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

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

3 Project Overview-Storage Ring 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 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% Commissioning went well. Approved to Start Routine Operations on September 22, BROOKHAVEN SCIENCE ASSOCIATES

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5 NSLS-II Construction and Primary Survey Network Construction 11 Primary 11 M0 and M1 are shared. 5 BROOKHAVEN SCIENCE ASSOCIATES

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

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 7 BROOKHAVEN SCIENCE ASSOCIATES

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 8 BROOKHAVEN SCIENCE ASSOCIATES

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. 9 BROOKHAVEN SCIENCE ASSOCIATES

10 Statistics of USMN Point Error Instrument accuracy Count Benefits: Adjustment by Spatial Analyzer Name Value Unit RMS mm Average mm Max mm Horizontal Angle " Vertical Angle " Distance mm Measurements 4747 Instruments 191 Attention: Make sure AT401 is leveled during the solving process to maintain the level information. 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. 10 BROOKHAVEN SCIENCE ASSOCIATES

11 Statistics of Star*net Average absolute Average relative Name Value Note Semi-Major Axis Semi-Minor Axis Elevation Comparison with Star*Net For all the monuments Semi-Major Axis For 39 points Semi-Minor Axis with an average distance of Elevation meter Coordinate deviation between Star*net and SA Coordinate deviation Name Value Note RMS X RMS Y RMS Z (elevation) For all the monuments 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. 11 BROOKHAVEN SCIENCE ASSOCIATES

12 Changes between Epoch 6 and 7 Horizontal Vertical 12 BROOKHAVEN SCIENCE ASSOCIATES

13 Use for Girder Alignment Girder name Deviation between 2 and 6 tracker setup 6 tracker setup RMS deviation of monuments DX DY DZ DX DY DZ Count Control network fitting error C06G C06G C06G C07G C07G C07G Multipole girder positional and rotational deviations. (Unit: millimeter for location and millirad for rotation) DX DY DZ ROLL PITCH YAW RMS MAX MIN BROOKHAVEN SCIENCE ASSOCIATES

14 Use for Girder Profiling Bring instruments together Profiling result 14 BROOKHAVEN SCIENCE ASSOCIATES

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. 15 BROOKHAVEN SCIENCE ASSOCIATES

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. 16 BROOKHAVEN SCIENCE ASSOCIATES

17 Thanks for your attention! 17 BROOKHAVEN SCIENCE ASSOCIATES