RTML ( Except Bunch Compressor )
-
Upload
wilma-beard -
Category
Documents
-
view
33 -
download
2
description
Transcript of RTML ( Except Bunch Compressor )
![Page 1: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/1.jpg)
RTML( Except Bunch Compressor )
Parameters and LayoutDiagnostics and Beam TuningAccelerator PhysicsAccelerator Components
S.Kuroda ( KEK )
![Page 2: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/2.jpg)
Beam Parameters
![Page 3: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/3.jpg)
Layout
![Page 4: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/4.jpg)
Extraction from the DR ( ERTL/PRTL )
No vertical dogleg in ERTL because of the DR vertical position
![Page 5: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/5.jpg)
Return Line ( ELTL/PLTL )• Following the earth’s curvature in ML tunnel
V correctors in each QV dispersion matching by v correctors at both ends
![Page 6: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/6.jpg)
Return Line ( ELTL/PLTL )(2)• Horizontal dogleg at the junction of ML and
BDS, which is different in ELTL and PLTL due to positron target
Geometry of the dog-leg defined in document EDMS: D*0969955
![Page 7: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/7.jpg)
Return Line ( ELTL/PLTL )(3)Mountain topography
Flat topography
![Page 8: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/8.jpg)
Turn Around
Spin Rotator
H-dogleg
V-dogleg
z
x
z
y
• 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.
![Page 9: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/9.jpg)
Spin Rotator
![Page 10: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/10.jpg)
Diagnostics• Cavity BPM • Laser Wire for emittance measurement
![Page 11: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/11.jpg)
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
![Page 12: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/12.jpg)
Beam Physics Issues
• ISR
Vertical emittance growth is negligible • Beam-Ion instability ( L.Wang, et al )– < 2mPa
Horizontal emittance growth
Arc( RTL ) 90nm (1.1 % )
Turn-around 430nm ( 5.4 % )
![Page 13: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/13.jpg)
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
![Page 14: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/14.jpg)
Stray Field ( Measurement )
N.Solyak 2011
![Page 15: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/15.jpg)
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
![Page 16: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/16.jpg)
Beam Physics Issues (4)
• Emittance Preservation ( A. Latina )
![Page 17: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/17.jpg)
Accelerator Components• Magnets
• Vacuum– Requirement: < 2mPa
![Page 18: RTML ( Except Bunch Compressor )](https://reader030.fdocuments.in/reader030/viewer/2022020721/5681309d550346895d968b05/html5/thumbnails/18.jpg)
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– …