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  Matched calorimetric loads for high power millimeter-wave gyrotrons

Bruschi, A., Muzzini, V., Spinicchia, N., Benocci, R., Carcano, G., Cirant, S., et al. (2003). Matched calorimetric loads for high power millimeter-wave gyrotrons. Fusion Engineering and Design, 66-68, 549-554. doi:10.1016/S0920-3796(03)00110-8.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3109-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-310F-3
Genre: Journal Article

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 Creators:
Bruschi, A.1, Author
Muzzini, V.1, Author
Spinicchia, N.1, Author
Benocci, R.1, Author
Carcano, G.1, Author
Cirant, S.1, Author
Gandini, F.1, Author
Gittini, G.1, Author
Granucci, G.1, Author
Leuterer, F.2, Author              
Mellera, V.1, Author
Monaco, F.3, Author              
Münich, M.4, Author              
Nardone, A.1, Author
Schütz, H.5, Author              
Signorelli, E.1, Author
Simonetto, A.1, Author
Sozzi, C.1, Author
Affiliations:
1Istituto di Fisica del Plasma ENEA-CNR-EURATOM, Sulla Fusione via Cozzi 53, 20125, Milan, Italy; Dip. di Fisica, Università di Milano-Bicocca, P.zza della Scienza 3, 20126, Milan, Italy; Istituto per l'Energetica e le Interfasi, CNR, Sez.di Milano, v. Cozzi 53, 20125, Milan, Italy, ou_persistent22              
2Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
3Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              
4External Organizations, ou_persistent22              
5Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              

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Free keywords: 22nd Symposium on Fusion Technology (SOFT 2002), Helsinki, 2002-09-09 to 2002-09-13
 Abstract: High power gyrotron testing at long pulses is a necessary step in the development of mm-wave systems for fusion research. For this purpose a compact calorimetric load is being developed, with low overall reflectivity (<5%) and aiming at 1 MW-CW capabilities, after the good performances of the loads (0.5 MW, 0.5 s per pulse) installed on the 140 GHz ECRH plant of the FTU Tokamak in Frascati. Tests at the same frequency but at higher power (0.7 MW, 1 s) and longer pulses (up to 2 s at 0.5 MW) on the ASDEX-Upgrade ECRH plant showed, after repeated exposures, damages on the absorbing layer, recognized as thermal effects due to the local enhancement of incident power: the effects visible near the entrance port are explained studying the superposition (with interference) of waves reflected inside the sphere. Samples of degraded and non-degraded coating have been analyzed with various techniques, revealing changes of the substrate's physical characteristics. Measurements of absorber temperature during and after the pulse, performed with an infrared detector looking directly into the load, allowed estimates of the peak temperature and thermal properties of the coating in the real working conditions. Improvements on power deposition, geometry and cooling are proposed, to be integrated in a new load design.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Fusion Engineering and Design
  Alternative Title : Fusion Eng. Des.
Source Genre: Journal
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Publ. Info: Copyright © 2003 Elsevier B.V. All rights reserved
Pages: - Volume / Issue: 66-68 Sequence Number: - Start / End Page: 549 - 554 Identifier: -