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DA measurements

DA measurements. Participants: S. Fartoukh, M. Giovannozzi, E. Maclean, S. Redaelli, F. Roncarolo, F. Schmidt, E. Todesco, R. Tomás , W. Venturini Delsolaro, F. Zimmermann. Method. From numerical simulations. DA evolution with time Proposed relationship between intensity evolution and DA

sydney-munoz
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DA measurements

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  1. DA measurements Participants: S. Fartoukh, M. Giovannozzi, E. Maclean, S. Redaelli, F. Roncarolo, F. Schmidt, E. Todesco, R. Tomás, W. Venturini Delsolaro, F. Zimmermann LHC Studies WG - MG

  2. Method From numerical simulations • DA evolution with time • Proposed relationship between intensity evolution and DA • Verified with experimental data from Tevatron and SPS • Use it to measure DA at the LHC. Tevatron data LHC Studies WG - MG

  3. Procedure - I • Nominal machine (Beam 1) • crossing bumps ON • coupling well corrected • collimators: all opened, primaries at 12 sigma (to shadow machine aperture) • Then • Inject a single bunch of about 1010 p, standard emittance(FWS measurement) • Blow-up transversely (H/V) using repeated kicks of MKA (FWS measurement and BSRT) • Measure intensity decay with time • Change settings (or repeat to gather statistics) and go to 1 LHC Studies WG - MG

  4. Procedure - II • Configurations to be tested: • Nominal (including MOs) • MOs set to zero (manual de-Gaussing) • Scan over MCOs and MCDs • Optimal procedure to deal with magnetic status of spool pieces is being defined • Measure diffusion rates at different amplitudes (fundamental assumption of the whole method). • This would require moving the primary collimators and retract them to determine intensity/losses variation with time. LHC Studies WG - MG

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