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BPM Offset Determination by Sinusoidal K-modulation

BPM Offset Determination by Sinusoidal K-modulation. J. Wenninger, K . Fuchsberger, T. Baer LHC Studies Working Group April, 19 th 2011. Aim of MD. Determine BPM offsets of (triplet) BPMs to improve steering. Identify best method of performing K-modulation. Proposed method.

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BPM Offset Determination by Sinusoidal K-modulation

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  1. BPM Offset Determination by Sinusoidal K-modulation • J. Wenninger, K. Fuchsberger, T. Baer LHC Studies Working Group April, 19th 2011

  2. Aimof MD • Determine BPM offsets of (triplet) BPMs to improve steering. • Identify best method of performing K-modulation.

  3. Proposed method • scanΔx with local orbit bump until: beam Δx‘ Δx

  4. Procedure • At 450 GeV, flat orbit, nominal/probe. • Modulate strengths of Q5/6 by about 1.4∙10-4 (2.5%) • Associated tune change: ≈ 0.01 • rms orbit change (assuming Δx = 1mm): ≈ 50µm • Try the same with triplet quadrupoles. • Larger β -> larger tune change.

  5. Example from 2010 • Modulation of MQXA.3L1 by 2∙10-5 • rms orbit change: 45µm

  6. Thank you • for your Attention • Tobias Baer • CERN BE/OP • Tobias.Baer@cern.ch • Office: +41 22 76 75379

  7. Backup slides

  8. To be done • Verify sinusoidal trim of quadrupoles. • YASP: • rms of all arc BPMs (Kajetan) • Fit sin² function to evolution plot (fixed frequency) (Kajetan?)

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