1 / 18

RTML ( Except Bunch Compressor )

S.Kuroda ( KEK ). RTML ( Except Bunch Compressor ). Parameters and Layout Diagnostics and Beam Tuning Accelerator Physics Accelerator Components. Beam Parameters. Layout. Extraction from the DR ( ERTL/PRTL ). No vertical dogleg in ERTL because of the DR vertical position.

wilma-beard
Download Presentation

RTML ( Except Bunch Compressor )

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 • …

More Related