Collimation Simulations and Optimisation

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1 Collimation Simulations and Optimisation Frank Jackson ASTeC, Daresbury Laboratory.

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Presentation transcript:

Collimation Simulations and Optimisation Frank Jackson ASTeC, Daresbury Laboratory

Contents Collimation design mature, lead by SLAC/FERMILAB My areas of input – collimation depths and collimation optimisation. Collimation Depths Analytical solution for current BDS “2006e”. BDSIM cross check (off energy halo) Collimation Optimisation and Halo Tracking Method and History Latest results 2006e

Collimation Depths Overview LDC small xing angle Criteria, clean passage of halo SR through IR apertures Beamcal and extraction quads are limiting apertures Many complicating factors Multiple crossing angle 20,14,2,0 mrad Multiple detector designs, L* IP Parameter Sets (Nominal only here, as in BDS design)

2 x 14 mrad approved after Vancouver New BDS for RDR 2 x 14 mrad approved after Vancouver Single 14 mrad as baseline “approval recommended” Identical FD to 20 mrad but different IR design 14 mrad 20 mrad 2006”e”

BDSIM cross check of collimation depths DBLT is linear on-energy envelope tracking BDSIM can track off-energy halo through FD SR profile at 1st Extraction Quad (r=18mm) p=1%, Gaussian On-energy, p=1% Gaussian

Collimation Optimisation ILC BDS evolution NLC BDS adapted for cold ILC linac ILC survivable betatron spoiler optics Collimation performance evolution NLC rather good collimation efficiency ILC collimation performance poorer. Tighter apertures in y. SPEX as secondary betatron spoiler. Can we tweak ILC lattice to restore NLC performance?

More History and Basic Design ILC BDS evolution not specifically addressed collimation optimisation Latest 2006e deck is for minimised length/cost PHASE ADVANCES not perfect for any design BANDWIDTH through final doublet not well controlled for any design Restore phase advances Search solution space for optimum bandwidth SP2 SP4 SPEX Matching quads restore phase advances

2006e Optimised Performance Tracking Results MERLIN BDS halo tracking, “black” spoilers set at nominal collimation depth Optimisation gives improved performance, sugges no longer need vertical SPEX collimator Original 2006e Performance New Performance Same population in both halos at FD

2006e Optimised Features Bandwidth Phase advances 2006e NLC 2006e optimised 2006e 2006e optimised SP4-SPEX x: 0.38 y: 0.59 x: 0.5 y: 1.0 SP4-IP x: 2.76 y: 2.34 x: 2.75 y: 3.25

2006e Optics Original Optimised Optimised 26m longer (single BDS)

Conclusions Optimised lattice performance seems much improved for primary halo tracking Full simulation (secondaries) and losses along line needed BDSIM/STRUCT Lattice longer/costlier so ultimately this optimisation may not be feasible. Additional quads rather than longer length?