State of the art of multicell SC cavities and perspectives
Superconducting cavity technology has made major progresses in the last decade with the introduction of high purity niobium on an industrial scale and, at the same time, by an improved understanding of the limiting processes in cavity performance, such as multipacting, field emission loading and thermal break-down. Multicell niobium cavities for beta = 1 particle acceleration, e.g. for the TESLA project, are routinely exceeding gradients of Eacc = 20 MV/m after the application of surface preparation techniques such as buffered chemical polishing or electropolishing, high pressure ultrapure water rinsing, UHV heat treatment and clean room assembly. The successes of the technology for beta = 1 accelerators has triggered a whole set of possible future applications for beta < 1 particle acceleration such as spallation neutron sources (SNS, ESS), transmutation of nuclear waste (TRASCO, ASH) or rare isotopes (RIA). The most advanced of these projects is SNS now under construction at Oak Ridge National Laboratory. This paper will review the technical solutions adopted to advance SRF technology and their impact on cavity performance, based on the SNS prototyping efforts. 2K at these high gradients are no longer out of reach. For the accelerator builder the challenge remains to come up with a good and reasonable design, which takes into account the status of the technology and does not over-estimate the achievable cavity performances in a large assembly such as, e.g., a multi-cavity cryo-module. In the following the criteria for multi-cell sc cavity design are reviewed and it is attempted to give a snapshot of the present status of multi-cell cavity performances.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 836687
- Report Number(s):
- JLAB-ACC-02-108; DOE/ER/40150-3126; TRN: US0500877
- Resource Relation:
- Conference: EPAC, Paris (FR), 06/03/2002--06/07/2002; Other Information: PBD: 1 Aug 2002
- Country of Publication:
- United States
- Language:
- English
Similar Records
High gradient superconducting niobium cavities: A review of the present status
Cavity Preparation/assembly Techniques and Impact on Q, Realistic Q - Factors in a Module, Review of Modules
Related Subjects
43 PARTICLE ACCELERATORS
ACCELERATORS
BUILDERS
CAVITIES
CHEMICAL POLISHING
CLEAN ROOMS
CONSTRUCTION
ELECTROPOLISHING
FIELD EMISSION
HEAT TREATMENTS
NEUTRON SOURCES
NIOBIUM
RADIOACTIVE WASTES
SPALLATION
TRANSMUTATION
WATER