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Title: Materials and technological processes for High-Gradient accelerating structures: new results from mechanical tests of an innovative braze-free cavity.

Journal Article · · Journal of Instrumentation
 [1];  [2];  [3];  [4];  [5];  [6]
  1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  2. National Inst. of Nuclear Physics (INFN), Milan (Italy)
  3. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
  4. National Inst. of Nuclear Physics (INFN), Frascati (Italy); Rome International Centre for Materials Science Superstripes (RICMASS) (Italy)
  5. National Inst. of Nuclear Physics (INFN), Frascati (Italy)
  6. Comeb, Rome (Italy)
+ Show Author Affiliations

Pure oxygen-free high-conductivity copper is a widely used material for manufacturing accelerating cavities working at room temperature. Several studies attempted to explain limitations associated with the maximum allowed field gradients and the behaviour of vacuum RF breakdown in copper accelerating structures through generation and movement of dislocations under stresses associated with RF electric and magnetic fields. Pure copper and also copper alloys undergo mechanical and thermal treatments to be hardened and strengthened during manufacturing, although their mechanical properties significantly change after heating above 590°C. High temperature brazing and diffusion bonding are assembly methods widely used to manufacture ultra-high vacuum accelerating devices. However, these processes, occurring at about 800–1000°C, significantly affect the mechanical properties of copper and copper alloys. We introduce here a novel Tungsten Inert Gas welding procedure, which is fast and keeps the high-gradient surfaces of the cavity and other components well below the copper annealing temperature. This process may be successfully used to manufacture copper-based accelerating components. This technology further preserves the hardness and cleanliness of copper in order to achieve the maximum accelerating gradient.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1617158
Journal Information:
Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 01 Vol. 15; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

References (18)

Effect of friction stir processing on microstructure and mechanical properties of aluminium journal March 2012
Dislocation nucleation from near surface void under static tensile stress in Cu journal July 2011
New local field quantity describing the high gradient limit of accelerating structures journal October 2009
Effect of friction stir processing on microstructure and mechanical properties of aluminium journal March 2012
High-power comparison among brazed, clamped and electroformed X-band cavities
  • Spataro, B.; Alesini, D.; Chimenti, V.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 657, Issue 1 https://doi.org/10.1016/j.nima.2011.06.047
journal November 2011
EuPRAXIA@SPARC_LAB Design study towards a compact FEL facility at LNF
  • Ferrario, M.; Alesini, D.; Anania, M. P.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 909 https://doi.org/10.1016/j.nima.2018.01.094
journal November 2018
Dislocation nucleation from near surface void under static tensile stress in Cu journal July 2011
Electrical resistivity of copper, gold, palladium, and silver journal October 1979
Innovative compact braze-free accelerating cavity journal September 2018
rf breakdown tests of mm-wave metallic accelerating structures journal January 2016
rf breakdown measurements in electron beam driven 200 GHz copper and copper-silver accelerating structures journal November 2016
Design of the Compact Linear Collider main linac accelerating structure made from two halves journal April 2017
High gradient experiments with X -band cryogenic copper accelerating cavities journal October 2018
Next generation high brightness electron beams from ultrahigh field cryogenic rf photocathode sources journal February 2019
New local field quantity describing the high gradient limit of accelerating structures journal October 2009
Experimental study of rf pulsed heating journal April 2011
Effects of surface damage on rf cavity operation journal June 2006
Extra strengthening and work hardening in gradient nanotwinned metals journal November 2018

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