R&D progress of the high power negative ion accelerator for the ITER NB system at JAEA
Identifieur interne : 000559 ( France/Analysis ); précédent : 000558; suivant : 000560R&D progress of the high power negative ion accelerator for the ITER NB system at JAEA
Auteurs : M. Kashiwagi [Japon] ; M. Taniguchi [Japon] ; M. Dairaku [Japon] ; H. P. L. De Esch [France] ; L. R. Grisham [États-Unis] ; L. Svensson [France] ; H. Tobari [Japon] ; N. Umeda [Japon] ; K. Watanabe [Japon] ; K. Sakamoto [Japon] ; T. Inoue [Japon]Source :
- Nuclear Fusion [ 0029-5515 ] ; 2009.
Abstract
At JAEA, as the Japan Domestic Agency (JADA) for ITER, a MAMuG (multi-aperture multi-grid) accelerator has been developed to perform the required R&D for the ITER neutral beam (NB) system. As a result of countermeasures to handle excess heat load to the ion source by backstreaming positive ions, H ion beam current was increased to 0.32A (the ion current density of 140Am2) at a beam energy of 796keV. This high power beam acceleration simulated the ITER operation condition maintaining the perveance (H ion current density/beam energy3/2) of the ITER accelerator. After the high power beam operation, the pulse length was successfully extended from 0.2 to 5s at 550keV, which yielded a 131mA H ion beam as an initial test of the long pulse operation. A test of a single-aperture single-gap (SINGAP) accelerator was performed at JAEA under an ITER R&D task agreement. The objective of this test was to compare two different accelerator concepts (SINGAP and MAMuG) at the same test facility. As a result, the MAMuG accelerator was defined as the baseline design for ITER, due to advantages in its better voltage holding and less electron acceleration. In three-dimensional beam trajectory analyses, the aperture offset at the bottom of the extractor was found to be effective for compensation of beamlet deflection due to their own space charge. It has been analytically demonstrated that these compensated beamlets can be focused at a focal point by adopting the aperture offset at the final grid of the accelerator.
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DOI: 10.1088/0029-5515/49/6/065008
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Fusion</title><idno type="ISSN">0029-5515</idno><idno type="eISSN">1741-4326</idno><imprint><publisher>IOP Publishing and International Atomic Energy Agency</publisher><date type="published" when="2009">2009</date><biblScope unit="volume">49</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="1">1</biblScope><biblScope unit="page" to="7">7</biblScope><biblScope unit="production">Printed in the UK</biblScope></imprint><idno type="ISSN">0029-5515</idno></series><idno type="istex">6742B0FA9A751F7C6C9DEF4D6C0F471082BB2376</idno><idno type="DOI">10.1088/0029-5515/49/6/065008</idno><idno type="PII">S0029-5515(09)03675-8</idno><idno type="articleID">303675</idno><idno type="articleNumber">065008</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0029-5515</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">At JAEA, as the Japan Domestic Agency (JADA) for ITER, a MAMuG (multi-aperture multi-grid) accelerator has been developed to perform the required R&D for the ITER neutral beam (NB) system. As a result of countermeasures to handle excess heat load to the ion source by backstreaming positive ions, H ion beam current was increased to 0.32A (the ion current density of 140Am2) at a beam energy of 796keV. This high power beam acceleration simulated the ITER operation condition maintaining the perveance (H ion current density/beam energy3/2) of the ITER accelerator. After the high power beam operation, the pulse length was successfully extended from 0.2 to 5s at 550keV, which yielded a 131mA H ion beam as an initial test of the long pulse operation. A test of a single-aperture single-gap (SINGAP) accelerator was performed at JAEA under an ITER R&D task agreement. The objective of this test was to compare two different accelerator concepts (SINGAP and MAMuG) at the same test facility. As a result, the MAMuG accelerator was defined as the baseline design for ITER, due to advantages in its better voltage holding and less electron acceleration. In three-dimensional beam trajectory analyses, the aperture offset at the bottom of the extractor was found to be effective for compensation of beamlet deflection due to their own space charge. It has been analytically demonstrated that these compensated beamlets can be focused at a focal point by adopting the aperture offset at the final grid of the accelerator.</div></front></TEI><affiliations><list><country><li>France</li><li>Japon</li><li>États-Unis</li></country><region><li>New Jersey</li></region><orgName><li>Université de Princeton</li></orgName></list><tree><country name="Japon"><noRegion><name sortKey="Kashiwagi, M" sort="Kashiwagi, M" uniqKey="Kashiwagi M" first="M." last="Kashiwagi">M. Kashiwagi</name></noRegion><name sortKey="Dairaku, M" sort="Dairaku, M" uniqKey="Dairaku M" first="M." last="Dairaku">M. Dairaku</name><name sortKey="Inoue, T" sort="Inoue, T" uniqKey="Inoue T" first="T." last="Inoue">T. Inoue</name><name sortKey="Kashiwagi, M" sort="Kashiwagi, M" uniqKey="Kashiwagi M" first="M." last="Kashiwagi">M. Kashiwagi</name><name sortKey="Sakamoto, K" sort="Sakamoto, K" uniqKey="Sakamoto K" first="K." last="Sakamoto">K. Sakamoto</name><name sortKey="Taniguchi, M" sort="Taniguchi, M" uniqKey="Taniguchi M" first="M." last="Taniguchi">M. Taniguchi</name><name sortKey="Tobari, H" sort="Tobari, H" uniqKey="Tobari H" first="H." last="Tobari">H. Tobari</name><name sortKey="Umeda, N" sort="Umeda, N" uniqKey="Umeda N" first="N." last="Umeda">N. Umeda</name><name sortKey="Watanabe, K" sort="Watanabe, K" uniqKey="Watanabe K" first="K." last="Watanabe">K. Watanabe</name></country><country name="France"><noRegion><name sortKey="De Esch, H P L" sort="De Esch, H P L" uniqKey="De Esch H" first="H. P. L." last="De Esch">H. P. L. De Esch</name></noRegion><name sortKey="Svensson, L" sort="Svensson, L" uniqKey="Svensson L" first="L." last="Svensson">L. Svensson</name></country><country name="États-Unis"><region name="New Jersey"><name sortKey="Grisham, L R" sort="Grisham, L R" uniqKey="Grisham L" first="L. R." last="Grisham">L. R. Grisham</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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