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BPM Issues in Sector 7-8

This report outlines the various issues encountered with Beam Position Monitors (BPMs) in Sector 7-8 during the LHC Injection Test. The BPM problems included suspected H/V flip, fibre mix-ups, and horizontal plane inversions. Key solutions were implemented, including corrections on BPM 34R7.B2 and BPM 28R7.B2, while successful tests of synchronous capture mode were conducted. Data collection was improved, leading to more stable pre-pulse timing. Automation for quick phasing of all BPMs is now planned to enhance efficiency in future tests.

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BPM Issues in Sector 7-8

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  1. BPM Issues in Sector 7-8 • Asynchronous Trajectory Mode • Worked on 1st Shot • All BPMs acquired • BPM Problems • BPMIV.88104 – H / V flip suspected • H pick-up on BI installation traveller – should be V • Fibre mix-up on 8 BPMs Q1-Q7 Left of 8 • Corrected on Saturday morning • BPM.34R7.B2 • Horizontal plane inverted • BPM.28R7.B2 • B1-B2 mismatch of individual button signal • Reflectometry team? • BPM.12R7.B2 • H / V inversion – fibres crossed • BPMWE.5L7.B2 • H polarity error (nothing visible on photos) Rhodri Jones – AB/BI LHC Injection Test – Beam 2

  2. BPM Issues in Sector 7-8 • Other Suspects • BPMW.5L7.B2 • both H & V - gain/polarity? optics? (*) • BPMSX.4L8.B2 • both H & V - gain/polarity? optics? • Beam is off centre in BPMSX by ~10mm (in between D1 & D2) • Optics • phase advance error • insufficient response data for further details Courtesy of R. Steinhagen Rhodri Jones – AB/BI LHC Injection Test – Beam 2

  3. BPM Issues in Sector 7-8 • Successful Tests of Synchronous Capture Mode • BST successfully used to advance pre-pulse to 2 turns before injection • Data collected from a single front-end crate • alternate BPMs from Q1L8 to Q32L8 • Conclusions • Pre-pulse to bunch timing stable to better than 3ns • limited by resolution of BPM TDC • Reproducible • Uncorrected & corrected data sets taken 2 shifts apart • Will now automate this to allow quick phasing in of all BPMs Rhodri Jones – AB/BI LHC Injection Test – Beam 2

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