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Optimizing Collimation Settings and Impedance Measurements for LHC Performance

This document outlines the nominal collimation settings and parallel impedance measurements crucial for LHC operations. The focus includes quench tests in the IR7 dispersive section, tuning collimator gaps during operational ramps, and maintaining consistent distances to primary collimators. Predictions indicate improved cleaning efficiency with nominal settings, particularly at high intensities of 3.5 TeV. Additionally, the report discusses loss maps, tune-shift observations, and the optimization of BLM thresholds to enhance overall collimation strategies and minimize single diffractive proton losses.

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Optimizing Collimation Settings and Impedance Measurements for LHC Performance

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  1. Collimation MDs Daniel Wollmann for the Collimation-Team, BLM-Team, Impedance-Team, … LHC Study Working Group, 19.04.2011

  2. Outline • Nominal Collimation settings with parallel impedance measurement • Quench test in the DS of IR7

  3. Collimator Settings – Intermediateas currently in the machine • Intermediate: keep distance to primary collimators constant in millimeters during the ramp • Nominal: keep distance to primary collimator constant in beam sigma during the ramp

  4. Better cleaning with nominal collimation settings worse Factor >2 better cleaning at 3.5TeV predicted R.W. Assmann, 2009 better Tight: Best performance but increasingly tight tolerances.

  5. Nominal Collimator settings • 3.5 TeV • Max Intensity: 3e11p • Close gaps of collimators in steps from operational, intermediate settings tonominal settings • Tune shift observations during step wise movement of collimator families • Qualification with loss maps (B1/B2 h/v, one off-momentum) • If time: test 7TeV (factor 1.4 smaller) settings with low emittance LHC beam

  6. Quench test in the DS of IR7 • Losses into DS of IR7 are predicted to define the collimation dependent intensity limit • Measured as predicted: Losses of single diffractive protons in DS (off-momentum particles, loss positions independent of plane of losses) • Quench test will allow to better specify the collimation dependent intensity limit. • Optimization of BLM threshold in the DS • Results will possibly impact the collimation upgrade scenarios

  7. Single Diffractive Protons lost in DSZoom IR7-IR8 Losses of single diffractive protons after interaction with primary collimator (off-momentum protons)

  8. Losses during stable beams (336b) - Today IR7 Luminosity dependent losses in the DSs of the experimental IRs (off-momentum particles) IR3 IR6

  9. Quench test in the DS of IR7 • 3.5 TeV (450GeV not sufficient, need single diffractive losses) • Max Intensity: 1e13p • Create high losses at primary collimators in IR7 • Maximum losses in cold aperture expected to appear in DS • Produce realistically distributed losses in DS (dilution, loss spots, … ); not possible with bump

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