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Poster communications

Plans and progress towards tuning the ATF2 final focus system to obtain a 35 nm IP waist

Abstract : Using a new extraction line currently being commissioned, the ATF2 experiment plans to test a novel compact final focus optics design using a local chromaticity correction scheme, such as could be used in future linear colliders*. Using a 1.3 GeV beam of ∼30nm normalised vertical emittance extracted from the ATF damping ring, the primary goal is to achieve a vertical IP waist of 35nm. We discuss our planned strategy, implementation details and early experimental results for tuning the ATF2 beam to meet the primary goal. These optics require uniquely tight tolerances on some magnet strengths and positions, we discuss efforts to re-match the optics to meet these requirements using high-precision measurements of key magnet elements. We simulated in detail the tuning procedure using several algorithms and different code implementations for comparison from initial orbit establishment to final IP spot-size tuning. Through a Monte Carlo study of 100's of simulation seeds we find we can achieve a spot-size within 10% of the design optics value in at least 90% of cases. We also ran a simulation to study the long-term performance with the use of beam-based feedbacks.
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http://hal.in2p3.fr/in2p3-00424421
Contributor : Sabine Starita <>
Submitted on : Thursday, October 15, 2009 - 4:31:49 PM
Last modification on : Wednesday, September 16, 2020 - 4:19:50 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 10:45:07 PM

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  • HAL Id : in2p3-00424421, version 1

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G.R. White, R. Tomas, K. Kubo, S. Kuroda, Y. Renier, et al.. Plans and progress towards tuning the ATF2 final focus system to obtain a 35 nm IP waist. 23rd Particle Accelerator Conference "PAC09", May 2009, Vancouver, Canada. Triumf Vancouver, pre-press version, pp.FR5PFP021, 2009. ⟨in2p3-00424421⟩

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