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ID 20752
file
creator
Cheng, Weh-Hao
Gluckstern, Robert L.
NDC
Physics
abstract
Simultaneous longitudinal and transverse focusing can be obtained in a drift tube linac by alternating the sign of the synchronous phase. It is found both theoretically and numerically that, in the alternating-phase-focused (APF) linac with a symmetric synchronous phase sequence, the lowest-order resonance due to the synchrobetatron coupling naturally occurs, causing significant emittance transfer between the longitudinal and transverse motions. Equations for the averaged APF motion are derived to investigate the coupling effect. Two approximate invariants are obtained. Results from computer simulations based on a modified parmila code yield good agreement with the formulas for the invariant and tune shift derived from the theory. We then suggest a way to move the parameters away from the lowest-order resonance. Simulation results for the effect of space charge on the emittance exchange along with the synchrobetatron coupling are briefly discussed.
journal title
Physical Review E
volume
Volume 48
issue
Issue 6
start page
4689
end page
4698
date of issued
1993-12
publisher
The American Physical Society
issn
1063-651X
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 1993 The American Physical Society
relation url
department
Graduate School of Advanced Sciences of Matter