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Beam Optimization and Measurement Progress Report - April 1, 2010

On April 1, 2010, studies were initiated after delays due to an RQD.A12 trip. Injection for RF capture optimization began around noon, with adjustments made to the capture voltage due to low SPS emittance. Initial tests for chromaticity were performed, and a smooth ramp was prepared for the squeeze test, which started successfully without losses. However, beam stability issues arose, with significant losses during AC dipole excitation. Subsequent interventions included cryogenic recovery and ongoing measurements for tune and chromaticity corrections.

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Beam Optimization and Measurement Progress Report - April 1, 2010

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  1. 01/04/2010

  2. 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

  3. 01/04/2010 • Preliminary tests of the chromaticity measurement by RF frequency modulation

  4. 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)

  5. 01/04/2010 • b* = 9 m • Tune and chromaticity OK

  6. 01/04/2010 • b* = 9 m • Beta beating measurement • Beam 2 • Beam 1 (lost 80 % of the beam during AC dipole excitation)

  7. 01/04/2010 • b* = 7 m • Tune and chromaticity OK

  8. 01/04/2010 • b* = 7 m • Beam 2

  9. 01/04/2010 • b* = 5 m - Tune and chromaticity OK. Coupling increases to ~0.01

  10. 01/04/2010 • b* = 5 m • Beam 2

  11. 01/04/2010 • Coupling Beam 2 • b*=9 m b*=5 m

  12. 01/04/2010 • Important loss during the ramp  beam unstable. Likely chromaticity too low

  13. 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

  14. 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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