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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/31553001
Record Status
Checked
Record Id
31553001
Title
Design and testing of a four rod crab cavity for High Luminosity LHC
Contributors
B Hall (Cockcroft Inst., and Lancaster Univ.)
,
G Burt (Cockcroft Inst., and Lancaster Univ.)
,
R Apsimon (Cockcroft Inst., and Lancaster Univ.)
,
C Lingwood (Cockcroft Inst., and Lancaster Univ.)
,
A Tutte (Cockcroft Inst., and Lancaster Univ.)
,
A Grudiev
,
A Macpherson
,
M Navarro-Tapia
,
R Calaga
,
K Hernández-Chahín
,
R Appleby (Cockcroft Inst., and Manchester Univ.)
,
P Goudket (STFC Daresbury Lab.)
Abstract
A 4-rod deflecting structure is proposed as a possible crab cavity design for the LHC high luminosity upgrade. Crab cavities are required for the LHC luminosity upgrade to provide a greater bunch overlap in the presence of a crossing angle, but must fit in the existing limited space. The structure has two parallel sections consisting of two longitudinally opposing quarter-wave rods, where each rod has the opposite charge from each of its nearest neighbors. The structure is transversely compact because the frequency is dependent on the rod lengths rather than the cavity radius. Simulations were undertaken to investigate the effect of rod shape on surface fields, higher order multipole terms and induced wakefields in order to obtain the optimal rod shape. The simulation results presented show that the addition of focus electrodes or by shaping the rods the sextupole contribution of the cavity voltage can be negated; the sextupole contribution is 321.57 mTm/m2, Epeak=27.7 MV/m, and Bpeak=63.9 mT at the design voltage of 3 MV. The damping requirements for the LHC are critical and suitable couplers to damp all modes but the operating mode are presented. The results of various testing cycles of the first SRF 4 rod prototype cavity are presented and show that the cavity has reached the required transverse voltage of 3 MV.
Organisation
ASTeC
,
CI
,
STFC
Keywords
Funding Information
STFC
(ST/G008248/1);
STFC
(ST/N001575/1);
EC
, Seventh Framework Programme (284404);
CERN
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Phys Rev Spec Top-Ac
20, no. 1 (2017): 012001.
doi:10.1103/PhysRevAccelBeams.20.012001
2017
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