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    Adhoc BI-TB for LHC BPM electronics factors

    → Europe/Zurich
    866/2-D05 (CERN)

    866/2-D05

    CERN

    30
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      WBTN calibration factors at LHC construction time (Rhodri)

    • Reminder of electronics principle (splitting opposite electrodes and delaying one by 10nsec)
    • Start and stop pulsing are sampled and provides in-range flags to ADC values
    • Tunnel electronics is WBTN with laser diode, surface DAB64x mezzanine is WBTI
    • Electronics normalised in FESA server to -1 -> 1 (geometrical values applied)
    • Low and high gain values differ (X3 and X1) - average of TI8 electronics installed provides values for SPS->LHC transfer-lines
    • Data from refurbished test bench to be checked to decide whether individual factor are needed (combining WBTN/WBTI factors)
    • Geometrical factors: offset from centre, scale factors and non-linearity
    • Geometrical correction (cross-terms) from EDMS document (covers 40% of aperture)
    • Question about best way to handle rotated BPMs by 45 degrees
    • Check with Jorg whether still see problems with BPMS (several installed around the LHC). Compare with DOROS values (connected on same BPMs)
    • Review the position calculation algorithm (Michal, Manfred and Manuel)

    Application of electronics and geometric factors in the FESA server (Manuel)

    • Reminder of the different steps (temperature correction (off?), calibration with filling pattern for low and high gains)
    • Reminder of the wbtn_X3/X1 for low and high gain (0.159, 0.141) - close to old values TI8
    • Question about logging of statuses and calibration values (NXCALS) (to be checked)
    • Add unit-tests (test-bench) and common C++ library for position calculation (Standard and Doros). Michal happy to take part in code-review

    Latest results from the calibration bench (Michal)

    • Some changes to procedure on test-bench
    • Data systematically updated and stored on MTF (inforEAM)
    • Some work may
    • Question whether the old MTF files can be retrieved

    LS2 WBTN calibration (Manfred)

    • A few slides would be helpful ..
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