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Title: EXPERIMENTAL HEAT LEAK MEASUREMENTS ON THE APT 210 KW CW RF POWER COUPLER

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
783373
Report Number(s):
LA-UR-01-3794
TRN: US0110551
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 Jun 2001
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 07 ISOTOPES AND RADIATION SOURCES; ACCELERATORS; RF SYSTEMS; POWER SUPPLIES; HEAT LOSSES; TRITIUM; ISOTOPE PRODUCTION

Citation Formats

J. WAYNERT, P. BLUMENFELD, and ET AL. EXPERIMENTAL HEAT LEAK MEASUREMENTS ON THE APT 210 KW CW RF POWER COUPLER. United States: N. p., 2001. Web.
J. WAYNERT, P. BLUMENFELD, & ET AL. EXPERIMENTAL HEAT LEAK MEASUREMENTS ON THE APT 210 KW CW RF POWER COUPLER. United States.
J. WAYNERT, P. BLUMENFELD, and ET AL. 2001. "EXPERIMENTAL HEAT LEAK MEASUREMENTS ON THE APT 210 KW CW RF POWER COUPLER". United States. doi:. https://www.osti.gov/servlets/purl/783373.
@article{osti_783373,
title = {EXPERIMENTAL HEAT LEAK MEASUREMENTS ON THE APT 210 KW CW RF POWER COUPLER},
author = {J. WAYNERT and P. BLUMENFELD and ET AL},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2001,
month = 6
}

Conference:
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  • A cryogenic test rig was designed and fabricated to measure the heat leak from room temperature to 2 K from the Accelerator Production of Tritium (APT) 700 MHz, 210 kW continuous wave (CW) co-axial power coupler (PC). The outer conductor of the PC is stainless steel with 15 {micro}m copper film on the inside. The copper inner conductor operates at room temperature and contributes considerable infra-red radiation heat load to 2 K. Two thermal intercept heat exchangers cooled by supercritical helium are incorporated into the outer conductor to reduce the heat conducted to the lowest temperatures. A brief description ofmore » the experimental apparatus is presented. A comparison of the experimental measurements and the predictions of a detailed thermal model is given. There is also a discussion of anomalous behavior observed in the thermal intercepts, and fluctuations in the helium coolant properties.« less
  • Hydrogen desorbed from the beam tube of the super collider by synchrotron radiation may adversely affect the luminosity lifetime of the proton beam. One solution to this problem is to place a distributed cryopump within the beam tube which will pump desorbed gasses. Such a cryopump can be effected by attaching cryosorber to the cold (4 K) magnet bore tube. A concentric tube, or liner, centered within the magnet bore tube shields the cryosorber from the synchrotron radiation, and becomes the beam tube. By perforating a fraction of the liner surface with small (on the order of 1--3 mm) holes,more » the liner/cryosorber assembly becomes a distributed pump. The liner temperature may be allowed to equilibrate at a temperature close to that of the 4 K bore tube. However, actively stationing the liner at 80 K is of interest because the synchrotron radiation heat can then be deposited in the liquid nitrogen system. This, at least partially, decouples the allowable beam current from the helium cryogenic system. Active control is accomplished by means of 80 K helium flowing through a trace tube attached to the outside of the liner.« less
  • Hydrogen desorbed from the beam tube of the super collider by synchrotron radiation may adversely affect the luminosity lifetime of the proton beam. One solution to this problem is to place a distributed cryopump within the beam tube which will pump desorbed gasses. Such a cryopump can be effected by attaching cryosorber to the cold (4 K) magnet bore tube. A concentric tube, or liner, centered within the magnet bore tube shields the cryosorber from the synchrotron radiation, and becomes the beam tube. By perforating a fraction of the liner surface with small (on the order of 1--3 mm) holes,more » the liner/cryosorber assembly becomes a distributed pump. The liner temperature may be allowed to equilibrate at a temperature close to that of the 4 K bore tube. However, actively stationing the liner at 80 K is of interest because the synchrotron radiation heat can then be deposited in the liquid nitrogen system. This, at least partially, decouples the allowable beam current from the helium cryogenic system. Active control is accomplished by means of 80 K helium flowing through a trace tube attached to the outside of the liner.« less
  • An apparatus was designed and constructed to measure the transient cooling effects on a gas inside a closed space. Modeled after a type of Stirling engine, the closed space was built with a cylinder and a displacer which divided the gas space into a hot space, a cold space, and a regenerator space. A method was developed to calculate the heat transfer coefficient in each closed space from the measured pressure transient. 7 refs.