skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Design and vertical tests of double-quarter wave cavity prototypes for the high-luminosity LHC crab cavity system

Journal Article · · Physical Review Accelerators and Beams
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; « less

Crab crossing is essential for high-luminosity colliders. The high-luminosity Large Hadron Collider (HL-LHC) will equip one of its interaction points (IP1) with double-quarter wave (DQW) crab cavities. A DQW cavity is a new generation of deflecting rf cavities that stands out for its compactness and broad frequency separation between fundamental and first high-order modes. The deflecting kick is provided by its fundamental mode. Each HL-LHC DQW cavity shall provide a nominal deflecting voltage of 3.4 MV, although up to 5.0 MV may be required. A proof-of-principle (POP) DQW cavity was limited by quench at 4.6 MV. This paper describes a new, highly optimized cavity, designated the DQW SPS series, which satisfies dimensional, cryogenic, manufacturing, and impedance requirements for beam tests at the Super Proton Synchrotron (SPS) and operation in the LHC. Two prototypes of this DQW SPS series were fabricated by U.S. industry and cold tested after following a conventional superconducting radio-frequency surface treatment. Both units outperformed the POP cavity, reaching a deflecting voltage of 5.3-5.9 MV. This voltage - the highest reached by a DQW cavity - is well beyond the nominal voltage of 3.4 MV and may even operate at the ultimate voltage of 5.0 MV with a sufficient margin. This paper covers fabrication, surface preparation, and cryogenic rf test results and implications.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP); U.S. LHC Accelerator Research Program (LARP); European Union (EU); Small Business Innovation Research (SBIR) program
Contributing Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); NIOWAVE Inc., Lansing, MI (United States); CERN
Grant/Contract Number:
AC02-98CH10886; AC02-05CH11231; SC0007519; AC02-07CH11359; SC0012704; 284404
OSTI ID:
1464300
Alternate ID(s):
OSTI ID: 1457155; OSTI ID: 1463858; OSTI ID: 1480806
Report Number(s):
arXiv:1805.08123; FERMILAB-PUB-18-207-TD; BNL-207933-2018-JAAM; PRABCJ; 082002
Journal Information:
Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 21 Journal Issue: 8; ISSN 2469-9888
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

References (11)

RF deflector design and measurements for the longitudinal and transverse phase space characterization at SPARC
  • Alesini, David; Di Pirro, Giampiero; Ficcadenti, Luca
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 568, Issue 2 https://doi.org/10.1016/j.nima.2006.07.050
journal December 2006
The Kapitza conductance of PVF-coated copper and some materials used for superconducting magnets journal January 1992
Frequency dependence of trapped flux sensitivity in SRF cavities journal February 2018
Influence of various vacuum surface treatments on the secondary electron yield of niobium
  • Calder, Roger; Dominichini, Georges; Hilleret, Noël
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 13, Issue 1-3 https://doi.org/10.1016/0168-583X(86)90581-1
journal March 1986
Unprecedented quality factors at accelerating gradients up to 45 MVm −1 in niobium superconducting resonators via low temperature nitrogen infusion journal August 2017
Design, prototyping, and testing of a compact superconducting double quarter wave crab cavity journal April 2015
Cryogenic test of a proof-of-principle superconducting rf-dipole deflecting and crabbing cavity journal August 2013
Superconducting TESLA cavities journal September 2000
The crab cavities cryomodule for SPS test journal July 2017
RF Superconductivity book March 2009
Design and testing of a four rod crab cavity for High Luminosity LHC journal January 2017

Cited By (2)

Design studies of a compact superconducting rf crab cavity for future colliders using Nb/Cu technology journal July 2019
Development and vertical tests of a 166.6 MHz proof-of-principle superconducting quarter-wave beta = 1 cavity journal August 2019

Similar Records

Cryogenic RF tests of US LARP DQW SPS-series cavities
Technical Report · Thu Oct 24 00:00:00 EDT 2019 · OSTI ID:1464300
+12 more
Niobium-coated copper cavities for the eRHIC crabbing system
Technical Report · Fri Jun 22 00:00:00 EDT 2018 · OSTI ID:1464300
Design, prototyping, and testing of a compact superconducting double quarter wave crab cavity
Journal Article · Tue Apr 28 00:00:00 EDT 2015 · Physical Review Special Topics. Accelerators and Beams · OSTI ID:1464300
+10 more

Related Subjects

43 PARTICLE ACCELERATORS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
42 ENGINEERING
particle collider
crab activity
luminosity
radio frequency calculations
superconducting RF