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Title: Review of R&D at DESY on ingot niobium for accelerators

An R&D program at DESY exploring the potential of the production of 1.3 GHz TESLA shape cavities from large grain or ingot niobium material has been carried out as a feasibility study for using ingot niobium material for the European X-ray Free-Electron Laser project. The most important issues like feasibility of the fabrication of niobium discs from ingots, material properties, cavity fabrication, treatment, and finally the cryogenic radiofrequency (RF) performance of the cavity in the accelerator modules are presented and discussed. At least 25% higher intrinsic quality factor comparing to conventional fine-grain niobium and high accelerating gradient of up to 45 MV/m have been demonstrated during the cryogenic RF tests both in the vertical cryostats and in a completely assembled accelerating cryo-module.
Authors:
; ; ;  [1]
  1. Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, DE-22607 Hamburg (Germany)
Publication Date:
OSTI Identifier:
22492691
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1687; Journal Issue: 1; Conference: Ingot niobium summary workshop, Newport News, VA (United States), 4 Dec 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; COMPARATIVE EVALUATIONS; CRYOSTATS; DESY; FABRICATION; FEASIBILITY STUDIES; FREE ELECTRON LASERS; GHZ RANGE 01-100; NIOBIUM; QUALITY FACTOR; RADIOWAVE RADIATION; RF SYSTEMS; SUPERCONDUCTING CAVITY RESONATORS; X RADIATION