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Title: Double Quarter Wave Crab Cavity Field Profile Analysis and Higher Order Mode Characterization

The Large Hadron Collider (LHC) is underway for a major upgrade to increase its luminosity by an order of magnitude beyond its original design specifications. This novel machine configuration known as the High Luminosity LHC (HL-LHC) will rely on various innovative technologies including very compact and ultra-precise superconducting crab cavities for beam rotation. A double quarter wave crab cavity (DQWCC) has been designed at Brookhaven National Laboratory for the HL-LHC. This cavity as well as the structural support components were fabricated and assembled at Niowave. The field profile of the crabbing mode for the DQWCC was investigated using a phase shift bead pulling technique and compared with simulated results to ensure proper operation or discover discrepancies from modeled results and/or variation in fabrication tolerances. Higher-Order Mode (HOM) characterization was also performed and correlated with simulations.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Accelerator R and D Div.
  2. (United States). Physics and Astronomy Dept.
Publication Date:
OSTI Identifier:
1154889
Report Number(s):
BNL--105949-2014-IR; BNL-C-A/AP/520
R&D Project: KBCH139; KB0202011; TRN: US1500114
DOE Contract Number:
AC02-98CH10886
Resource Type:
Technical Report
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CERN LHC; BEAM LUMINOSITY; SUPERCONDUCTING CAVITY RESONATORS; COMPARATIVE EVALUATIONS; DESIGN; ROTATION; SIMULATION; SUPPORTS; PHASE SHIFT; PARTICLE BEAMS; TOLERANCE; FABRICATION; VARIATIONS