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Diagnostic and Layout Parameters for DR Beam Tuning and Accelerator Physics Improvement

This document outlines the parameters and layouts specific to the extraction from the double ring (DR) in accelerator physics, focusing on the ERTL/PRTL systems. It includes essential diagnostics such as cavity BPM and laser wire for emittance measurement, along with the configuration of horizontal and vertical doglegs to adjust beam elevation. It addresses beam tuning challenges, such as dispersion matching, coupling corrections, and the impacts of stray fields and halo formation. A summary of the ongoing work and future simulation studies is also provided to ensure optimal performance and emittance preservation.

wilma-beard
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Diagnostic and Layout Parameters for DR Beam Tuning and Accelerator Physics Improvement

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  1. S.Kuroda ( KEK ) RTML( Except Bunch Compressor ) Parameters and Layout Diagnostics and Beam Tuning Accelerator Physics Accelerator Components

  2. Beam Parameters

  3. Layout

  4. Extraction from the DR ( ERTL/PRTL ) No vertical dogleg in ERTL because of the DR vertical position

  5. 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

  6. Return Line ( ELTL/PLTL )(2) Geometry of the dog-leg defined in document EDMS: D*0969955 • Horizontal dogleg at the junction of ML and BDS, which is different in ELTL and PLTL due to positron target

  7. Return Line ( ELTL/PLTL )(3) Mountain topography Flat topography

  8. Turn Around • Horizontal dogleg • Vertical dogleg to adjust elevation to ML • 180-8 deg. turn around with dispersion matching( 8 deg. is needed for spin rotator ) • Bunch by bunch feed-forward. Time delay is 600 ns. z Spin Rotator x H-dogleg y V-dogleg z

  9. Spin Rotator

  10. Diagnostics • Cavity BPM • Laser Wire for emittance measurement

  11. Beam Tuning • Dispersion Correction • Normal and skew Q in ERTL/PRTL in hx region • In pairs with –I --> No introduction of coupling • Normal Q in h/v dogleg of Turn Around • Coupling correction • 4 skew Qs in zero dispersion region downstream of ERTL/PRRTL and Spin Rotator

  12. Beam Physics Issues • ISR Vertical emittance growth is negligible • Beam-Ion instability ( L.Wang, et al ) • < 2mPa

  13. Beam Physics Issues (2) • Stray Field • Tolerance ( K.Kubo ) • 2nT for orbit jitter of 0.2sy • This can be corrected by fast feed-forward • Higher for emittance growth

  14. Stray Field ( Measurement ) N.Solyak 2011

  15. Beam Physics Issues (3) • 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

  16. Beam Physics Issues (4) • Emittance Preservation ( A. Latina )

  17. Accelerator Components • Magnets • Vacuum • Requirement: < 2mPa

  18. Summary and Work to Be Done • Lattice and optics design is almost done in TDR • Must be re-designed when the accelerator length is adjusted. • A few things of accelerator physics issue to be done? • Simulation study should be continued( emittance, ..) • Stray field measurement should be continued. • Space charge tune shift • …

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