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MD: Variable Transverse Damper Gain, Tune Measurement and Emittance Preservation

MD: Variable Transverse Damper Gain, Tune Measurement and Emittance Preservation - Detailed planning -. presented by W. Hofle. Participants: D. Valuch , W. Hofle , F. Dubouchet , V. Kain , M. Kuhn, F. Roncarolo , M. Gasior , R. Steinhagen , and.

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MD: Variable Transverse Damper Gain, Tune Measurement and Emittance Preservation

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  1. MD: Variable Transverse Damper Gain, Tune Measurement and EmittancePreservation - Detailed planning - presented by W. Hofle Participants: D. Valuch, W. Hofle, F. Dubouchet, V. Kain, M. Kuhn, F. Roncarolo, M. Gasior, R. Steinhagen , and LHC MSWG

  2. 2012 MD#1 Draft 1(WARNING: Details will be adjusted due to commissioning progress and issues arising) see Mariusz 2 hours, 450 GeV probe • Fri • 06:00 – 07:00: end of fill study (tune scan, levelling, …) • 09:00 – 12:00: 450 GeV: Longitudinal impedance • 12:00 – 18:00: 450 GeV 4 TeV: ADT (incl. fast blow-up test) • 20:00 – 02:00: 450 GeV: BI (FBCT and BPM’s) • Sat • 04:00 – 12:00: 450 GeV 4 TeV: Collimation • 14:00 – 22:00: 450 GeV: Injection: beam loss limitations towards nominal intensity • 00:00 – 08:00: 450 GeV 4 TeV: Aperture at the triplets • Sun • 10:00 – 18:00: 450 GeV: RF batch by batch blow-up • 18:00 – 23:00: 450 GeV 4 TeV: BI (emittance cross calibration with ADT blowup) • 01:00 – 06:00: 450 GeV 4 TeV: ADT (tune compatibility) consequence: only one ramp for ADT-gain part LHC MSWG

  3. Friday, April 20, 2012, ADT 4 hours Part 1: 1.5 hours inject probe and eight nominal bunches (RF-MD fill pattern) 15 minutes high gain (standard gain on flat bottom), 15 minutes low gain (as in prepare for ramp) inject probe and eight nominal bunches (RF-MD fill pattern), nominal procedure with 30 minutes wait at high gain objective: see if difference in emittance evolution between 1) and 2) beams: probe and eight nominal (indiv) at 1.4x1E11 (+/- t.b.d.) instruments: BRST, wirescanners, check damping time from logging and with Qkicker change of damper gains, otherwise nominal machine at 450 GeV, damper in single bunch mode LHC MSWG

  4. Friday, April 20, 2012, ADT 4 hours Part 2: 2.5 hours inject probe and eight nominal bunches (RF-MD fill pattern) : prepare gain modulation bunch-by-bunch, one bunch will have zero gain (0.5 hours) verify damping time by kicking bunches with Qkicker(0.5 hours) inject fresh beam (standard gain), then activate gain modulation (0.5 hours) 4) if tune feedback ok  ramp, dump at 4 TeV after emittance measurements objective: a) see if difference in emittance evolution between different bunches b) record and analyze bunch-by-bunch position signal from damper pick-ups (feasibility of tune measurement from damper data) beams: probe and eight nominal (indiv) at 1.3x1E11, leading bunch +20% intensity instruments: wirescanners, check damping with Qkicker from logging modulation of damper gain, bunch-by-bunch, damper in single bunch mode LHC MSWG

  5. Monday, April 23, 2012, ADT 5 hours Part 3: 5 hours (2 ramps) inject probe and eight nominal bunches (RF-MD fill pattern) with gain modulation bunch-by-bunch (leading nominal bunch with varying intensity) ramp, observe in particular BBQ signals, with BI experts present objective: a) compare emittance evolution of different bunches with different gain b) record and analyze bunch-by-bunch position signal from damper pick-ups (feasibility of tune measurement from damper data) c) compare the BBQ signals from the two ramps with different leading bunch intensity beams: probe and eight nominal (indiv) at 1.3x1E11, leading bunch +20% intensity for one of the two ramps instruments: wirescanners, check damping with Qkicker from logging, BBQ modulation of damper gain, bunch-by-bunch, damper in single bunch mode LHC MSWG

  6. Questions ? LHC MSWG

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