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Title: STATUS OF THE LANL ACTIVITIES IN THE FIELD OF RF SUPERCONDUCTIVITY

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
785875
Report Number(s):
LA-UR-01-4988
TRN: US0302043
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Aug 2001
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 42 ENGINEERING; LANL; SUPERCONDUCTIVITY; RF SYSTEMS; TECHNOLOGY ASSESSMENT

Citation Formats

T. TAJIMA, K. C. CHAN, and ET AL. STATUS OF THE LANL ACTIVITIES IN THE FIELD OF RF SUPERCONDUCTIVITY. United States: N. p., 2001. Web.
T. TAJIMA, K. C. CHAN, & ET AL. STATUS OF THE LANL ACTIVITIES IN THE FIELD OF RF SUPERCONDUCTIVITY. United States.
T. TAJIMA, K. C. CHAN, and ET AL. Wed . "STATUS OF THE LANL ACTIVITIES IN THE FIELD OF RF SUPERCONDUCTIVITY". United States. doi:. https://www.osti.gov/servlets/purl/785875.
@article{osti_785875,
title = {STATUS OF THE LANL ACTIVITIES IN THE FIELD OF RF SUPERCONDUCTIVITY},
author = {T. TAJIMA and K. C. CHAN and ET AL},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 01 00:00:00 EDT 2001},
month = {Wed Aug 01 00:00:00 EDT 2001}
}

Conference:
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  • Since the last workshop we have tested six b=0.64, 700 MHz, 5-cell elliptical superconducting cavities in collaboration with JLAB in vertical cryostats. All the cavities exceeded the requirements for Accelerator Production of Tritium (APT) (Q0 = 5 x 109 at Eacc = 5 MV/m) with ample margin. The low-field Q0 at 2 K was 2-3 x 1010 and the maximum accelerating field reached 12 MV/m, which corresponds to peak electric and magnetic fields of 41 MV/m and 835 Oe, respectively. Power couplers have also been tested in a test bench up to over 1 MW. Since the APT project hasmore » transitioned to Advanced Accelerator Applications (AAA) project, a new type of superconducting accelerating structure called spoke cavity emerged as an excellent candidate for the low energy sections between the RFQ and the elliptical cavities. We tested a b=0.29, 340 MHz, 2-gap spoke cavity on loan from Argonne National Laboratory. The results showed Q0 = 2 x 109 at low fields and a maximum accelerating field Eacc = 12.5 MV/m at 4 K. At 5 MV/m, the Q0 was 1.5 x 109. Encouraged by these results, we started fabricating some spoke cavities and are planning to test one of them in the beamline of LEDA (Low Energy Demonstration Accelerator) in the future.« less
  • This report briefly summarizes activities, including: tests of elliptical cavities; design and testing of high-power couplers and cryomodules; design, procurement, and tests of 2-gap spoke cavities. It also summarizes critical technology issues.
  • This paper reports the status of hardware development for the linac portion of the Argonne tandem-linac accelerator system (ATLAS). The ATLAS superconducting linac consists of an independent-phased array of 45 superconducting niobium resonators of the split-ring type. The linac has been operating in its present form since 1985, on a 24-hours per day, 5 days per week schedule. An upgrade of the ATLAS system is currently under construction the positive-ion injector (PII). The PII system will consist of an ECR positive-ion source mounted on a high-voltage platform injecting a very-low-velocity superconducting linac. The completed system will provide for the accelerationmore » of beams of mass up to uranium, and will replace the tandem electrostatic accelerator as the injector for ATLAS. The status of resonator development for the superconducting linac is reported in this paper. Accelerating gradients in the existing ATLAS linac are currently limited by excessive heating and rf loss in the fast-tuning system associated with each superconducting resonator. Development of an upgraded fast-tuning system is also reported here. 7 refs., 5 figs.« less