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Title: High-Power RF Window, Final Report

Publication Date:
Research Org.:
Asgard Microwave, Spokane, WA
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Type / Phase:
Resource Type:
Technical Report
Country of Publication:
United States
43 PARTICLE ACCELERATORS; 42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Distributed Window; Waveguide Window; High-Power Window, Microwave Window

Citation Formats

Aster, David B. High-Power RF Window, Final Report. United States: N. p., 2007. Web.
Aster, David B. High-Power RF Window, Final Report. United States.
Aster, David B. Thu . "High-Power RF Window, Final Report". United States. doi:.
title = {High-Power RF Window, Final Report},
author = {Aster, David B.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 22 00:00:00 EST 2007},
month = {Thu Feb 22 00:00:00 EST 2007}

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  • The construction of a reheatable high-power ceramic window used with a traveling-wave linear accelerator between the acceleraror waveguide and the source of of power is described. This window consists of a high-purity alumina disk mounted in the common wall between two offset sections of rectangular waveguide. This location removes the ceramic disk from direct electron bombardment, in case this is a problem. O.F.H.C. copper is vacuum-cast around the edge of the disk, which is metailized with titanium hydride. A molybdenum washer is cast in the copper centered on the edge of the disk, which reduces the strain on the copper-ceramicmore » joint during subsequent reheats by restricting the expansion of the copper. After being cast, the metalized disk is machined, then vacuum-checked heated to 500 deg in hydrogen cooled and rechecked for vacuum tighthess. If still vacuumtight, it is hydrogen-furnacebrazed with a silver- copper eutectic in o the waveguide assembly. Windows of this type typically have a voltagestanding-wave ratio (V.S.W.R.) in the range 1.01 to 1.03. One window gave a V.S.W.R. or 1.01 at 2855 megacycles with a V.S.W.R. less than 1.02 for 200 megacycles centered around 2850 megacycies. This type of window was used successfully on four linacs. (auth)« less
  • The window used to transmit electron beams for use in high average power UV/visible lasers has been a critical technology issue. The window structure must satisfy a number of conflicting requirements including: vacuum integrity, strength to overcome both the static and dynamic pressure loads of the laser gas and a low mass density to minimize energy loss by the electron beam. In addition, it must not perturb the laser gas flow and must be able to dissipate the power deposited by the electron beam. Two experiments were undertaken to demonstrate the applicability of phase transition cooling for high power lasermore » systems. In the first of these a full width 50 cm module was tested with a constant input heat source. The second experiment used a pulsed e-beam source to demonstrate cooling for a low duty cycle high peak power pulsed system. The applicability of phase transition cooling for a dual foil geometry was clearly demonstrated. Cooling rates in excess of 100 W/(sq cm)/foil surface with mass flow rates consistent with low areal mass density were achieved. This represents a factor of ten improvement over prexisting state of the art.« less