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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/51378
Record Status
Checked
Record Id
51378
Title
Compensation of transverse field asymmetry in the high-beta quarter-wave resonator of the HIE-ISOLDE linac at CERN
Contributors
MA Fraser (Cockcroft Inst., Manchester Univ., and CERN) (Pr.Au.)
,
M Pasini (KUL and CERN)
,
A D'Elia (Cockcroft Inst., Manchester Univ., and CERN)
,
RM Jones (Cockcroft Inst., and Manchester Univ.)
Abstract
The superconducting upgrade of the REX-ISOLDE radioactive ion beam (RIB) post-accelerator at CERN will utilise a compact lattice comprising quarter-wave resonators (QWRs) and solenoids, accelerating beams in the mass range 2.5 < A/q < 4.5 to over 10 MeV/u. The short and independently phased quarter-wave structures allow for the acceleration of RIBs over a variable velocity profile and provide an unrivalled longitudinal acceptance when coupled with solenoid focusing. The incorporation of the solenoids into the cryomodule shortens the linac, whilst maximising the acceptance, but the application of solenoid focusing in the presence of asymmetric QWR fields can have consequences for the beam quality. The rotation of an asymmetric beam produces an effective emittance growth in the laboratory reference system. We present modifications of the cavity geometry to optimise the symmetry of the transverse fields in the high-beta QWR. A racetrack shaped beam port is analysed and a modification made to the inner conductor with a geometry that will enable a niobium film to be effectively sputtered onto the cavity surface.
Organisation
ISOLDE
,
ASTeC-AP
,
CI
,
STFC
Keywords
quarter-wave resonator
,
transverse asymmetry
,
Physics
,
HIE-ISOLDE
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Paper In Conference Proceedings
In 14th International Conference on RF Superconductivity (SRF 2009), Berlin, Germany, 20-25 Sep 2009,
CI Preprints
, Cockcroft-09-36 (2009).
arXiv:0909.4930v1
2009
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