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Advanced Beam Parameters and Diagnostics for RTML in TDR Discussion

This document outlines critical beam parameters and layout considerations for the RTML (Return-to-Mainline) in the TDR (Technical Design Report) context. It addresses the curvature of the Earth's surface impacting magnetic alignment, the introduction of correctors for dispersion matching, and various diagnostic techniques including cavity BPM and laser wire for emittance measurement. Key beam physics issues, such as stray fields, emittance preservation, and beam-ion instabilities, are discussed in detail, along with specified tolerances and criteria for performance optimization.

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Advanced Beam Parameters and Diagnostics for RTML in TDR Discussion

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  1. S.Kuroda ( KEK ) Baseline RTML in TDR( For discussion )

  2. Beam Parameters

  3. Layout

  4. Return Line ( ELTL/PLTL ) • Following the earth’s curvature in ML tunnel V correctors in each Q V dispersion matching by v correctors at both ends The curved orbit is introduced as ‘design’ or orbit distortion?

  5. Diagnostics • Cavity BPM • Laser Wire for emittance measurement New definition of RTML: BC is not included. Diagnostics and correction section upstream of BC1 is included in RTML? Polarization measurement?

  6. Beam Physics Issues • Stray Field • Tolerance ( K.Kubo ) • 2nT for orbit jitter of 0.2sy • This can be corrected by fast feed-forward • Higher for emittance growth • From what the criteria 0.2sy comes?. Criteria for emittance growth?

  7. Stray Field ( Measurement ) Is it OK after all? N.Solyak 2011

  8. Beam Physics Issues (2) • Emittance Preservation ( A. Latina )

  9. Other Beam Physics Issues in TDR • ISR Vertical emittance growth is negligible • Beam-Ion instability ( L.Wang, et al ) • < 2mPa • Halo Formation from Scattering( S.M.Seletskiy ) • 2mPa  2e-6 of beam intensity < tolerance of 1e-5 • Space-Charge Effect • Incoherent space charge tune shift is O(0.15) in v • To be studied

  10. Back Up

  11. K.Kubo

  12. K.Kubo

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