DocumentCode :
2162100
Title :
Nonlinear effects in the SLC e+ transport line
Author :
Braun, H. ; Kulikov, A. ; Pitthan, R. ; Woodley, M.
Author_Institution :
Paul Scherrer Inst., Villigen, Switzerland
fYear :
1991
fDate :
6-9 May 1991
Firstpage :
1845
Abstract :
The target area of the SLC positron system, 2 km down the linac, is connected back to the front end of the machine by 2 km-long transport line, consisting of 75 FODO cells, with a quadrupole aperture of 10 cm. The beam in the return line experiences a loss larger than predicted. Taking into account the relatively high dodecapole component in the FODO lattice quadrupoles of 2.5% of the quadrupole component at a radius of 4.65 cm, it is found through particle tracking that nonlinear resonances occur for certain values of the phase advance per FODO cell, particularly at 90 degrees , the standard value previously used. These resonances lead to particle loss in the outer layers of phase space due to the particles with a large amplitude being more affected by the dodecapole moment.<>
Keywords :
electron accelerators; linear accelerators; particle beam diagnostics; FODO cells; SLC positron system; dodecapole component; dodecapole moment; nonlinear resonances; particle beam diagnostics; quadrupole aperture; transport line; Apertures; Beam steering; Coils; Colliding beam accelerators; Collimators; Earth; Linear accelerators; Monitoring; Particle accelerators; Particle tracking;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
Type :
conf
DOI :
10.1109/PAC.1991.164797
Filename :
164797
Link To Document :
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