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01/04/2010. 01/04/2010. Start of the studies delayed due to trip of RQD.A12 at 08:43 at the end of pre-cycling  nQPS triggered but no signal observed above threshold.

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01 04 20101
01/04/2010

  • Start of the studies delayed due to trip of RQD.A12 at 08:43 at the end of pre-cycling  nQPS triggered but no signal observed above threshold.

  • Injection started at ~12:00 for RF capture optimization. Due to the low longitudinal emittance delivered by the SPS the capture voltage could be decreased from 8 to 5 MV at injection

  • Trim to new values implemented in the sequencer


01 04 20102
01/04/2010

  • Preliminary tests of the chromaticity measurement by RF frequency modulation


01 04 20103
01/04/2010

  • Smooth ramp in preparation of squeeze test

  • 15:00 Beam lost at flat-top due to bad manipulation with the sequencer

  • Finally ready to start the squeeze at 18:30

  • No losses during the squeeze (except to over enthusiastic use of AC dipole)


01 04 20104
01/04/2010

  • b* = 9 m

  • Tune and chromaticity OK


01 04 20105
01/04/2010

  • b* = 9 m

  • Beta beating measurement

  • Beam 2

  • Beam 1 (lost 80 % of the beam during AC dipole excitation)


01 04 20106
01/04/2010

  • b* = 7 m

  • Tune and chromaticity OK


01 04 20107
01/04/2010

  • b* = 7 m

  • Beam 2


01 04 20108
01/04/2010

  • b* = 5 m - Tune and chromaticity OK. Coupling increases to ~0.01


01 04 20109
01/04/2010

  • b* = 5 m

  • Beam 2


01 04 201010
01/04/2010

  • Coupling Beam 2

  • b*=9 m b*=5 m


01 04 201011
01/04/2010

  • Important loss during the ramp  beam unstable. Likely chromaticity too low


01 04 201012
01/04/2010

  • Today:

    • 05:00 Ramp (without feedback) - OK

    • 06:37 – lost cryo (oil pump?) – beams dumped

    • access in PZ45 for CRYO intervention

    • around 14:00 – recover from cryo

    • 09:00 Tune feedback / chromaticity measurement during the ramp

    • 14:00 Non linear chromaticity measurement and off-momentum beta beating

    • 17:00-18:00 LHCb polarity change

    • Prepare fill for the night


01 04 201013
01/04/2010

  • Saturday to Monday:

    • 2 fills/day with an end of fill or beginning of fill study (2-3 hours)

  • Beginning/End of fill study list in work

    • Working point in collision

    • Machine protection tests

    • Non-linear chromaticity measurement at flat-top

    • b3 correction checks


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