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Results from Beam-Based Collimator Alignment

Results from Beam-Based Collimator Alignment. G. Valentino, R. W. Assmann , R. Bruce, F. Burkart , M. Cauchi , D. Deboy , L. Lari , S. Redaelli , B. Salvachua. Outline. The collimator s etup a pplication Fast BLM data acquisition

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Results from Beam-Based Collimator Alignment

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  1. Results from Beam-Based Collimator Alignment G. Valentino, R. W. Assmann, R. Bruce, F. Burkart, M. Cauchi, D. Deboy, L. Lari, S. Redaelli, B. Salvachua

  2. Outline • The collimator setup application • Fast BLM data acquisition • Software issues encountered during the setups • Results comparison: 2011 vs. 2012 • Qualification of the collimator settings • Summary

  3. Reminder: collimator setup application Structure as proposed for March 2012 setups User GUI BLM Spike Recognition Loss Threshold Selection Setup Task Sequencer Parallel Setup Algorithm BLM Feedback Fast BLM Data Acquisition

  4. 12.5 Hz BLM data acquisition CCC Setup Application 12.5 Hz and 1 Hz BLM signals cs-ccr-dev Left jaw aligned cs-ccr-logging2 Right jaw aligned Fast BLM Data Logging ~3900 BLMs in all crates Thanks to: R. Assmann, V. Baggiolini, A. Bland, B. Dehning, S. Jackson, S. Redaelli, C. Zamantzas

  5. Issues encountered during setups • Some software issues were encountered in the 450 GeV setup, which were fixed by the 4 TeV setup: • Fast BLM data was transmitted from the low-level with channels & crates in reverse order for each IR. • GUI: multi-threading issues prevented full functionality of GUI. • Sequencer not jumping correctly through the setup stages (TCP, parallel, sequential). • Setup Sheet: left and right jaw positions not saved correctly. • Outstanding issues: • Loss spike recognition: All clearly optimal spikes (e.g. TCP IR7) were classified correctly. • Main issues were for “grey area” spikes: in the classifier design, it was preferred to err in classifying an optimal spike as non-optimal rather than classifying an non-optimal spike as optimal. • When detecting a non-optimal spike, the jaw is moved in once again until an optimal spike is classified. This could cause dumps at 4 TeV if the jaw is at the beam and is moved in erroneously again. • Algorithm assumes a simple loss spike model with a low noise level, no other spikes after main spike, etc. • An improved spike recognition algorithm will be developed and tested in an MD. • Beam instabilities: possible impedance effects with too many collimators close to the beam (N. Mounet)

  6. Alignment results: setup time Setups in March 2012: Comparison in setup time 2010 – 2012 for the full system:

  7. Alignment results: beam-based centres Delta: 450 GeV 2011 vs. 2012 B1 and B2 Delta: Flat Top 2011 vs. 2012 B1 and B2 µ = 0.177 mm σ = 0.033 mm µ = 0.229 mm σ= 0.076 mm ∆ TCLIA.4R2 = -12.920mm ∆ TDI.4L2 = +7.048mm Beam-based centre comparison to 2011 for injection orbit.

  8. Alignment results: beam-based centres Delta: 450 GeV vs. 4 TeV B1 Delta: 450 GeV vs. 4 TeV B2 µ = 0.183 mm σ= 0.059 mm µ = 0.238 mm σ= 0.111 mm Beam-based centre comparison between 450 GeV and 4 TeV in 2012 (injection orbit).

  9. Alignment Results: Beam Size Ratios TDI TDI IR7 IR3 IR2 IR7 IR3 IR8 Beam Size Ratio comparison: 2012 vs 2011, 450 GeV

  10. Alignment Results: Beam Size Ratios IR3 IR7 IR3 IR7 Beam Size Ratio comparison: 2012 vs 2011, Flat Top

  11. Collimator Settings Qualification LIC BLMs LIC BLMs B. Salvachua

  12. Collimator Settings Qualification B. Salvachua

  13. Summary Collimator setup time reduced from 17 hours in 2011 to 7.5 hours in 2012 at flat top, 1 fill. Limit for setup time not yet reached: improvements can still be made. Further tests will be carried out in an 8 hour slot in April MD. Future Work: Only GUI will run on CCC console: BLM feedback and jaw movement requests to be moved to a server. Distributed application will be developed based on Java RMI and JMS, running on the server and the CCC console. More complex beam loss recognition system to be designed.

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