Summary of MKI UFO MD 7/17/20121MKI UFO MD 17.7.2012 LSWG Meeting Maria Hempel T. Baer, M. Barnes, S. Bart Pedersen, S. Cettour Cave, B. Dehning, E. Effinger,

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Presentation transcript:

Summary of MKI UFO MD 7/17/20121MKI UFO MD LSWG Meeting Maria Hempel T. Baer, M. Barnes, S. Bart Pedersen, S. Cettour Cave, B. Dehning, E. Effinger, R. Giachino, E. Griesmayer, M. Hempel, A. MacPherson, G. Roy, G. Trad, J. Uythoven

MD Plans Plan (10h): Inject 1236 bunches (half with large emittance, half with small emittance) Pulse MKIs on gap in circulating beam to produce UFOs (alternating B1/B2) Study UFO rate and dynamics with anti-e-cloud solenoids on/off Study UFO rate and dynamics for different MKI pulse lengths Make diamond BLM measurements from UFOs (1ns time resolution) Make BLM measurements with study buffer (80µs time resolution) Real program: 18:00 access (AC dipole, amplifier for diamond BLMs in Pt.7, etc.) 20:12 start the machine protection test procedure (no beam in LHC)  2h delay 21:14 test procedure finished, preparing for injection 22:38 BLM beam dump during 144b injection, TL steering and refill 0: bunches circulating (660b with ~3µm·rad and 576b with ~1.5µm·rad) 1:10 start pulsing MKIs 1:40 swtich off anti-e-cloud solenoids 1:53 MKI flashover  beam dump 1:57 open ventilation door  access, precycle 4:30 pilot injection Many (unrelated) technical problems  we could only measure 42min

Measurements Emittance measurement of all bunches (two different emittances) with BSRT Measurement or injection losses with diamond BLM in Pt.7 UFO in BLM study buffer. Asymmetric temporal loss profile (as predicted by theory)

Effect of anti-e-cloud solenoids 5 candidate UFOs (MKI.R8) in 18 MKI pulses with solenoids on 13 candidate UFOs (MKI.R8) in 8 MKI pulses with solenoids off Solenoids off increased pressure  flashover in MKI.C5R8

Summary Due to many (unrelated) technical problems only 42min of measurement time out of 10h scheduled MD time. Do not pulse MKIs without anti-e-cloud solenoids for high intensity beam (also Q4/Q5 solenoids are now activated during normal operation). Increased UFO activity with deactivated anti-e-cloud solenoids observed/confirmed. Diamond BLM configuration improved for (large) UFO diagnostics (see LBOC next week).