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Title: BNL 56 MHz HOM Damper Prototype Fabrication at JLab

A prototype Higher-Order Mode (HOM) Damper was fabricated at JLab for the Relativistic Heavy-Ion Collider's (RHIC) 56 MHz cavity at Brookhaven National Laboratory (BNL). Primarily constructed from high RRR Niobium and Sapphire, the coaxial damper presented significant challenges in electron-beam welding (EBW), brazing and machining via acid etching. The results of the prototype operation brought about changes in the damper design, due to overheating braze alloys and possible multi-pacting. Five production HOM dampers are currently being fabricated at JLab. This paper outlines the challenges faced in the fabrication process, and the solutions put in place.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Jefferson Lab., Newport News, VA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
OSTI Identifier:
1221887
Report Number(s):
JLAB-ACC--15-2082; DOE/OR/23177--3420
TRN: US1601452
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2015, Richmond, VA (United States), 3-8 May 2015
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; ELECTRON BEAM WELDING; BRAZING; BROOKHAVEN RHIC; MHZ RANGE 01-100; NIOBIUM; SAPPHIRE; ETCHING; BRAZING ALLOYS; SUPERCONDUCTING CAVITY RESONATORS; DESIGN; CHEMICAL MACHINING; ELECTROMAGNETIC FIELDS; MODE CONTROL