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BPM software and longest acquisitions

BPM software and longest acquisitions. L. Jensen BE/BI/SW. LHC Optics Measurement review – 17/6/2013. Outline. Simplified control system layouts BPM Electronics and front-end software LS1 objectives Answers to specific questions Conclusions. Control system overview.

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BPM software and longest acquisitions

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  1. BPM software and longest acquisitions L. Jensen BE/BI/SW LHC Optics Measurement review – 17/6/2013

  2. Outline • Simplified control system layouts • BPM Electronics and front-end software • LS1 objectives • Answers to specific questions • Conclusions

  3. Control system overview LHC IQC GUI (L. Drosdal OP) LHC Multi-Turn GUI (V. Kain OP) CMW CMDS SDDS PM-data LHC BPM Concentrators C. Roderick, L. Burdzanowski (BE/CO) Turn-by-turn Bunch-by-bunch IQC (B1 pt2, B2 pt8) Fixed configuration • CMW • Settings • Acquisitions (all) FE B1 / 1 (H/V) FE B2 / 1 (H/V) FE B1 / 2 FE B2 / 2 FE B1 / 32 FE B2 / 32

  4. LHC BPM electronics DAB64x firmware Asynchronous BPM WBTN INT ADC FIFO + Orbit Synchronous capture (bunch-by-bunch): • Bunch selection B (N slots selected) • Consecutive turn selection T • Hard limit: N*T <= 128k => (data/BPM –> never used) • Single hardware (buffer) implementation (IQC/: • Distributed trigger selection via BST: • Injection (warning) => pre-pulse from RF for IQC • Other (elsewhere in cycle) => MTG timing event per beam (1msec frame) Orbit Post-mortem Capture Turn clock (slot delay) 40MHz clock (25ns) (phase delay) Sensitivity selection Synchronous

  5. LHC BPM synchronous modes 2) Turn slot delay 1) ADC phase delay • Beam synchronous setting-up “phase-in” • Some problems seen in the past (calibration sequence) now believed to be resolved (delays should not move) • Now work without automatic TDC corrections • Special cases still causing problems (phase/slot)? • Values in LSA settings DB (reload possible) Bunch in slot 101 Bunch slots (3564) TDC e Start of turn (= end of abort-gap) Time (25nsec)

  6. LHC BPM procedure • Bunch and Turn selection • Data size = 10kB + (B*T)*0.4kB (per front-end) • Normal: single bunch (B=1), T = 3000 => 1Mbytes (per front-end) • 32 front-ends => 32 Mbytes total data size / beam (files) • Desired (Rogelio): 10000 turns -> ~100 Mbytes / beam • Maximum (128k bunches) => 1.3 Gbytes / beam • External BST trigger to all acquisition cards (a few turns delay from MTG event to start) • Acquisition finish: • Data read-out • Raw to position normalisation (see Eva’s presentation) • Calculation of turn-by-turn data (from bunch-by-bunch) • Data published to concentrators

  7. LS1 objectives (software) • Upgrade front-end systems to Linux • 4 * gain in available memory • 5 * gain in Ethernet speed (new Gbit switches) • Redesign software layers (FE->GUIs) • Take into account what we’ve learnt since 2008 • Closer look at use-cases (specifications)

  8. Answers to specific questions 1) DOROS electronics 2) Current BBQ and/or ADT BPMs See Marek’s talk later this afternoon 3) Additional data corrections for turn-by-turn data (X/Y) • See Eva’s talk 4) Shift of data in bunch-by-bunch mode • To be looked into with BE/CO – likely difficult to test without beam

  9. Conclusions • Trying to cover injection oscillation and optics with same mode -> complications • Firmware solutions? • Updated CPUs with compatible firmware expected to relieve some limitations • LHC turn-by-turn data mechanism to be studied • Understand usage • Identify limits to safe operation • Larger-scale tests to be planned during LS1 and following beam restart

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