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Detailed Analysis of LHC Scans: ATLAS, ALICE, CMS, and LHCb Performance Evaluation

This document outlines the detailed performance analysis of the LHC scans conducted by ATLAS, ALICE, CMS, and LHCb as of May 2011. It includes specifics on two-beam symmetric operations with a focus on separation adjustments and optimization requirements for various interactions. The report acknowledges contributions from key individuals and clarifies issues encountered during the scanning processes, such as errors in alignment and beam separations. A comprehensive examination of the calibration steps and data acquisition settings is also included.

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Detailed Analysis of LHC Scans: ATLAS, ALICE, CMS, and LHCb Performance Evaluation

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  1. May 2011 VdM scans SPECIAL THANKS TO Louis & Mirko For the nice fill 15.05.2011 Fill 1783

  2. ATLAS scans X, Y, X, Y, X with Y separation*, Y with X separation* (*Chose 0.16mm) All two-beam symmetric, +/-6 sigma, 25 steps, 20s/step X1 Y1 X2 Y2 X3 Y3 reoptimized ALICE to find head-on During the ATLAS scans: IP5/2/8 separated by 0.05/0.128/0.088 mm in the scanned plane (but IP8 only for first X/Y pair, then moved head-on in middle of 2nd X scan). Error: ALICE should have been head-on but wasn't (not optimized in X), hence the separation in X was ontop another one

  3. CMS scans X, Y, X, Y, X with Y separation*, Y with X separation* (*Chose 0.16mm) All two-beam symmetric, +/-6 sigma, 25 steps, 20s/step X1 Y1 X2 Y2 X3 Y3 During the CMS scans: IP1/2/8 separated by 0.05/0.128/0.088 mm in the scanned plane (but IP8 only for first X/Y pair)

  4. ALICE scans X, Y, X, Y All two-beam symmetric, +/-6 sigma, 25 steps, 30s/step X1 Y1 X2 Y2 During the ALICE scans: IP1/5 separated by 0.05/0.05 mm in the scanned plane

  5. LHCb scans X, Y two-beam symmetric, +/-6 sigma, 31 steps, 15s/step X, Y one-beam, +/-3 sigma active beam, 16 steps, 15s/step FAILED Y with x sep, Y two-beam symmetric, +/-6 sigma, 31 steps, 15s/step X1 Y1 X2 Y2 Y3 X sep Y4 During the X1/Y1 LHCb scans: IP1/2/5 separated by 0.05/00.128/.05 mm in the scanned plane

  6. Length Scale Calibs LHCb: 20 sec/step ALICE: 120 sec/step

  7. Length Scale Calibs ALICE: 120 sec/step CMS: 20 sec/step

  8. LHCb LSC sequence beam1 beam2 beam1 beam2 pos pos trim trim 0.000 0.000 +0.050 -0.050 0.050 -0.050 +0.080 +0.080 0.130 0.030 +0.080 +0.080 0.210 0.110 -0.080 -0.080 0.130 0.030 -0.080 -0.080 0.050 -0.050 -0.080 -0.080 -0.030 -0.130 -0.080 -0.080 -0.110 -0.210 +0.080 +0.080 -0.030 -0.130 +0.080 +0.080 0.050 -0.050 -0.080 -0.080 -0.030 -0.130 -0.080 -0.080 -0.110 -0.210 +0.080 +0.080 -0.030 -0.130 +0.080 +0.080 0.050 -0.050 +0.080 +0.080 0.130 0.030 +0.080 +0.080 0.210 0.110 -0.080 -0.080 0.130 0.030 -0.080 -0.080 0.050 -0.050 -0.050 +0.050 0.000 0.000 0.000 0.000

  9. LHCb LSC

  10. ALICE LSC sequence Cap_sigma = 0.100 mm maximum single beam offset = 0.35 mm ========== SEQUENCE =================== take data at | make trim on beam1 beam2 | beam1 beam2 0.000 0.000 0.350 0.250 0.350 0.250 -0.150 -0.150 0.200 0.100 -0.150 -0.150 0.050 -0.050 -0.150 -0.150 -0.100 -0.200 -0.150 -0.150 -0.250 -0.350 0.250 0.350 0.000 0.000 0.000 0.000 All in millimeters

  11. ALICE LSC

  12. CMS LSC sequence beam1 beam2 beam1 beam2 pos pos trim trim 0 0 0.03 -0.03 0.03 -0.03 0.035 0.035 0.065 0.005 0.035 0.035 0.1 0.04 0.035 0.035 0.135 0.075 -0.035 -0.035 0.1 0.04 -0.035 -0.035 0.065 0.005 -0.035 -0.035 0.03 -0.03 -0.035 -0.035 -0.005 -0.065 -0.035 -0.035 -0.04 -0.1 -0.035 -0.035 -0.075 -0.135 0.035 0.035 -0.04 -0.1 0.035 0.035 -0.005 -0.065 0.035 0.035 0.03 -0.03 -0.035 -0.035 -0.005 -0.065 -0.035 -0.035 -0.04 -0.1 -0.035 -0.035 -0.075 -0.135 0.035 0.035 -0.04 -0.1 0.035 0.035 -0.005 -0.065 0.035 0.035 0.03 -0.03 0.035 0.035 0.065 0.005 0.035 0.035 0.1 0.04 0.035 0.035 0.135 0.075 -0.035 -0.035 0.1 0.04 -0.035 -0.035 0.065 0.005 -0.035 -0.035 0.03 -0.03 -0.03 0.03 0 0 0 0

  13. SPECIAL THANKS TO "MAGIC FINGERS" Stephane & Walter

  14. And of course Many thanks to OP / BI / ABP And, special thanks: • LDM: Adam Jeff / EnricoBravin • "continuous" mode • BCTs: Jean-Jacques Gras • WS: Ana Guerrero • WCM: Ralph Steinhagen • BSRT: Federico Roncarolo / EnricoBravin • MC + Orbit: JorgWenninger, Mike Lamont

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