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Collimator design and short range wakefields

Collimator design and short range wakefields. Adriana Bungau. Christmas meeting - 2006 Manchester. Collimator Design and Material Damage. Aim: design the optimal spoilers for the ILC ( geometry and material specification)

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Collimator design and short range wakefields

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  1. Collimator design and short range wakefields Adriana Bungau Christmas meeting - 2006 Manchester

  2. Collimator Design and Material Damage • Aim: design the optimal spoilers for the ILC ( geometry and material specification) • Project: collaboration between Birmingham Univ, Manchester Univ, Daresbury Laboratory, SLAC and RAL Geant4 simulations in Manchester • Collimator design - two types of spoilers: a full metal spoiler and a combinations of metal and graphite • Three materials used: Ti4Al6V, Copper, Aluminium • Beam was sent through the collimator at 2 depths: 2mm and 10 mm from the top • Decision of the best spoiler candidate was based on: - instantaneous temperature rise - outgoing particle multiplicities - energy spectra of outgoing particles • The best spoiler candidate was Ti alloy with graphite • Results were cross-checked with Fluka and EGS4 - passed on at RAL for ANSYS studies EUROTeV reports and EPAC papers: • Geant4 Simulations of Energy Deposition in ILC spoilers - A.Bungau, R.Barlow, N.Watson, EUROTeV Report-2006-021 • Shower simulations, comparison of FLUKA, GEANT4 and EGS4 - L.Fernandez, A.Bungau, L.Keller, R.Barlow, N.Watson, EUROTeV-Report-2006-034

  3. Wakefield simulations with Merlin • Current situation: • mathematical formalism for incorporating higher order mode wakefields (R.Barlow) • formalism implemented in the Merlin code • SLAC beam tests simulated (good agreement between analytical calculations and • experiment • so far, only simple beamlines were studied (ie. Drift, Collimator, Drift) EPAC paper: “Simulation of High Order Short Range Wakefields” - R.Barlow, A. Bungau, EUROTeV-Report-2006-051 Studies are now extended to the ILC-BDS beamline - emittance growth due to wakefields and luminosity loss

  4. Wakefield Measurements at SLAC-ESA Motivation: to optimize the collimator design by studying various ways of minimising wakefield effects while achieving the required performance for halo removal • Collaboration between SLAC, Birmingham, Lancaster, Manchester, Daresbury • Commissioning: Jan 2006 (4 old collimators) - Successful • Physics: first run: Apr/May second run: July (8 new collimators – CCLRC) Experimental tests - tested 8 collimators fabricated at RAL - inserted collimators in beam path (x mover), moved collimator vertically (y mover),measured centroid kick to beam via BPMs - analysed kick angle vs collimator position (good runs as also bad runs) EUROTeV reports and EPAC papers: • "Test Beam Studies at SLAC End Station A for the International Linear Collider" -M.Woods et all,EUROTeV-Report-2006-060, SLAC-PUB-11988 • "Direct Measurement of Geometric and Resistive Wakefields in Tapered Collimators for the International Linear Collider" - N.Watson et all,EUROTeV-Report-2006-059, SLAC-PUB-12029

  5. Plans for 2007 • Colimator damage: • beam tests for material damage (SLAC, CERN ?) • Wakefield simulations: • studies for the ILC_BDS collimators with higher order modes • implement Gdfidl predictions in Merlin • Experimental tests at ESA: • next run: March 2007 with 8 new collimators • BPM reprocessing on the Manchester cluster • data analysis finished for 2006 and also for 2007 • data comparison with the first 8 collimators used in 2006 • Particle Accelerator Conference, June 2007-New Mexico - 5 abstracts

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