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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.

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rtml except bunch compressor

S.Kuroda ( KEK )

RTML( Except Bunch Compressor )

Parameters and Layout

Diagnostics and Beam Tuning

Accelerator Physics

Accelerator Components

extraction from the dr ertl prtl
Extraction from the DR ( ERTL/PRTL )

No vertical dogleg in ERTL because of the DR vertical position

return line eltl pltl
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

return line eltl pltl 2
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
return line eltl pltl 3
Return Line ( ELTL/PLTL )(3)

Mountain topography

Flat topography

turn around
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

diagnostics
Diagnostics
  • Cavity BPM
  • Laser Wire for emittance measurement
beam tuning
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
beam physics issues
Beam Physics Issues
  • ISR

Vertical emittance growth is negligible

  • Beam-Ion instability ( L.Wang, et al )
    • < 2mPa
beam physics issues 2
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
beam physics issues 3
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
beam physics issues 4
Beam Physics Issues (4)
  • Emittance Preservation ( A. Latina )
accelerator components
Accelerator Components
  • Magnets
  • Vacuum
    • Requirement: < 2mPa
summary and work to be d one
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