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MD: Variable T ransverse Damper Gain, Tune Measurement and Emittance Preservation. presented by W. Hofle. Participants : D. Valuch , W. Hofle , F. Dubouchet , V. Kain , M. Kuhn, F. Roncarolo , M. Gasior , R. Steinhagen , and. Proposal from Chamonix 2012.

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Presentation Transcript
slide1

MD: Variable Transverse Damper Gain,

Tune Measurement and Emittance Preservation

presented by W. Hofle

Participants:

D. Valuch, W. Hofle, F. Dubouchet, V. Kain, M. Kuhn,

F. Roncarolo, M. Gasior, R. Steinhagen , and

LHC MSWG

slide2

Proposal from Chamonix 2012

lower ADT gain for first bunch train of 12 bunches

implement in ADT observation of two selectable bunches

observe results of lower gain, incl. on BBQ (gated BBQ ?)

check practical feasibility of tune from residual damper signa

LHC MSWG

slide4

How we ran in 2011 with 50 ns beam

damper gain hor beam 1

(linear scale) HIGH @450 GeV

before prepare for ramp

increase of damper

(electronic) gain in ramp

To maintain approx.

same damping rate

ramp (energy)

drop of damper

gain

increased BBQ amplitude

= more residual beam oscillations

=> potentially leading to blow-up;

but signal needed for tune feedback

which is switched on here

BBQ hor Beam 1

amplitude

prepare for

ramp

ramp

Injection plateau

LHC MSWG

slide5

Objectives of proposed MD

  • investigate if higher ADT FB gain is cure for blow-up in ramp
  • improve compatibility of ADT and tune feedback by
  • witness bunch(es) with lower ADT gain
  • collect data for investigation of practical feasibility of tune
  • measurement from ADT PU data

New features prepared

on ADT side for 2012 (D. Valuch)

  • New 16k memory block(s) on FPGA for quasi continuous observation, for example 8 bunches each 2048 turns
  • Gain modulation, bunch selective, batch-by-batch (limited only by bandwidth of power system) in digital part of FB loop

LHC MSWG

slide6

Proposal for 1st MD Block 2012 (1)

  • inject 8 bunches per beam
  • one bunch per beam shall have 20% more intensity
  • (the “witness” bunch)
  • witness bunch without transverse feedback (zero gain)
  •  check if good BBQ signal at 450 GeVwhen
  • changing ADT FB gain for remaining 7 bunches
  • if OK, enable gain modulation for the 7 bunches
  • if OK lock tune feedback, then ramp with tune feedback and gain modulation

LHC MSWG

slide7

Proposal for 1st MD Block 2012 (2)

Observations

  • bunch-by-bunch wire scanners
  • cleanliness of BBQ signal
  • ADT bunch-by-bunch data (tune dip, offline)
  • losses bunch-by-bunch

Time

  • 6 hours, 1 ramp + preparation
  • Both beams, 8 nominal bunches per beam, nominal conditions, except ADT
  • stop MD at 4 TeV, if bunches good, can be used by other MD users

LHC MSWG