NINETEENTH CENTURY MUSIC最新文献_第7页

Residual gas analysis hardware and software data acquisition system at NSTX NSTX的残余气体分析硬件和软件数据采集系统

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027683

D. Mastrovito, W. Blanchard, J. Dong, R. Gernhardt, H. Kugel, G. Oliaro, T. Provost

{"title":"Residual gas analysis hardware and software data acquisition system at NSTX","authors":"D. Mastrovito, W. Blanchard, J. Dong, R. Gernhardt, H. Kugel, G. Oliaro, T. Provost","doi":"10.1109/FUSION.2002.1027683","DOIUrl":"https://doi.org/10.1109/FUSION.2002.1027683","url":null,"abstract":"The National Spherical Torus Experiment (NSTX) is the first step in an investigation of the physics principles of low-aspect-ratio spherical tori (ST) designed to study non-inductive start-up, current sustainability, current profile control, confinement, transport, pressure limits, stability and disruption resilience, as well as unique scrape-off layer (SOL) and divertor characteristics. NSTX started plasma operations in February 1999. During the first extended period of experiments, plasma discharge reproducibility and performance were strongly affected by impurity control and wall conditions. During this time, residual gas analyzer (RGA) data has been used during non-operating periods and between discharges to measure contributions to the vessel base-pressure (2-3E/sup -8/ Torr) that resulted from impurity gases evolving from internal surfaces. The RGA is a quadrupole mass spectrometer (QMS) with a Faraday Cup and electron multiplier. Recently, a second RGA system was installed to monitor fast changes in impurity gas production during and immediately after plasma discharges, which are indicative of changing conditions. In order to achieve the required response time, scan rates were increased by limiting the range of masses scanned. A data acquisition board was used to drive the new RGA system in concurrence with the NSTX shot cycle. Specialized interactive software to put acquired data into MDSplus, control data acquisition and assist in data analysis was written in Visual Basic and IDL.","PeriodicalId":44192,"journal":{"name":"NINETEENTH CENTURY MUSIC","volume":"37 1","pages":"234-237"},"PeriodicalIF":0.4,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91022141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"艺术学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A multi-channel phase detector using programmable logic devices 使用可编程逻辑器件的多通道相位检测器

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027652

N. Greenough, S. Depasquale, D. Lafrance

引用次数: 1

Recent results and future plan on JT-60U JT-60U的最新成果和未来计划

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027694

S. Ishida

{"title":"Recent results and future plan on JT-60U","authors":"S. Ishida","doi":"10.1109/FUSION.2002.1027694","DOIUrl":"https://doi.org/10.1109/FUSION.2002.1027694","url":null,"abstract":"Recently, JT-60U has intensively addressed enhancement and long sustainment of steady state performance in the use of negative-ion based neutral beam injection (N-NBI) and electron cyclotron (EC) wave injection. The N-NBI increased the current drive efficiency up to 1.55/spl times/10/sup 19/ A/m/sup 2//W at 360 keV and enhanced the fusion triple product up to n/sub i/(0)/spl tau//sub E/T/sub l/(0)/spl sim/3.0/spl times/10/sup 20/ keV sm/sup -3/ during, a full current drive condition. Increasing the plasma triangularity extended the duration of a plasma with /spl beta//sub N//spl sim/2.7 up to /spl sim/60 /spl tau//sub E/. The EC heating in combination with lower hybrid wave injection produced a very high electron temperature of /spl sim/26 keV for a reversed shear plasma. For reversed shear plasmas, the formation and sustainment of a central current hole was also discovered. High-field-side pellet injection extended the confinement up to H/sub 89p//spl sim/2 at n/n/sub G//spl sim/0.7. For the modification of JT-60, a fully superconducting tokamak, JT-60SC, is planned to further economical and environmental attractiveness in a tokamak DEMO reactor. The mission of JT-60SC is to realize high performance steady state operation and demonstrate the plasma applicability of low activation material for a plasma of break-even class relevant to the reactor plasma. Physics issues, design and machine description for JT-60SC with I/sub p/=4 MA, B/sub t/=3.8 T and R/sub p/=2.8 in are outlined.","PeriodicalId":44192,"journal":{"name":"NINETEENTH CENTURY MUSIC","volume":"1 1","pages":"276-281"},"PeriodicalIF":0.4,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86470593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"艺术学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Development of a high field solenoid magnet for the MAST Spherical Tokamak MAST球形托卡马克用高磁场电磁磁铁的研制

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027724

G. Voss, E. Ciattaglia

{"title":"Development of a high field solenoid magnet for the MAST Spherical Tokamak","authors":"G. Voss, E. Ciattaglia","doi":"10.1109/FUSION.2002.1027724","DOIUrl":"https://doi.org/10.1109/FUSION.2002.1027724","url":null,"abstract":"The Mega Amp Spherical Tokamak (MAST) is an experimental fusion device currently operating at the Culham Science Centre. The low aspect ratio of the spherical tokamak combined with the need to develop a high flux swing from its central solenoid leads to high forces on the conductors that form the centre column. This column consists of a compact solenoid wound around the inner limbs of the toroidal field coils. In order to achieve the nominal plasma parameters, the dimensions of the centre column were optimised to make best possible use of the space available. The most critical region of the solenoid magnet design is the end turn and tail section where complex 3D magnetic fields interact with the current in the end turn conductors giving an asymmetric stress distribution. The hoop load in this end turn is particularly troublesome since it must be reacted across a bonded joint, which inevitably generates tensile and shear stresses within it. This paper describes how this problem has been solved for the new MAST centre column by the use of compact quadrupole tails formed close to the main coil and connected to it by tight bends formed in the water cooled copper conductor. A test coil employing these features and fitted with engineering diagnostics has been manufactured and tested at Culham to the maximum design current. This coil not only demonstrated the manufacturing processes involved but also provided test data, which compares well with engineering analysis.","PeriodicalId":44192,"journal":{"name":"NINETEENTH CENTURY MUSIC","volume":"8 1","pages":"409-412"},"PeriodicalIF":0.4,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87648703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"艺术学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Status of WENDELSTEIN 7-X construction WENDELSTEIN 7-X施工现状

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027691

J. Feist

引用次数: 48

High heat flux tests of carbon composites for KSTAR and NSTX KSTAR和NSTX碳复合材料的高热流密度试验

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027708

R. Nygren, D. Youchison, J. Kim, K. Im, K.S. Kim, H.C. Park

{"title":"High heat flux tests of carbon composites for KSTAR and NSTX","authors":"R. Nygren, D. Youchison, J. Kim, K. Im, K.S. Kim, H.C. Park","doi":"10.1109/FUSION.2002.1027708","DOIUrl":"https://doi.org/10.1109/FUSION.2002.1027708","url":null,"abstract":"Uncooled samples of various carbon fiber composites (CFCs), nominally 2.50 cm square and 1.00 cm in height were exposed in the Electron Beam Test System (EBTS) to heat fluxes up to /spl sim/100 MW/m/sup 2/ for shots typically of 1.5 s. The heat flux was focused on a square 1 /spl times/ 1 cm at the center of the sample. For NSTX (National Spherical Torus Experiment), five samples of Allied Signal 2-D CFC Type 865-19-4 were tested with 1.5 s shots at heat fluxes to 120 MW/m/sup 2/. For KSTAR (Korean Superconducting Tokamak Advanced Research) Project, a total of 37 samples of 29 various CFCs were tested. Duplicates samples with thermocouples were used to measure the absorbed heat and to calculate the fraction of the beam power absorbed. The samples were tested to 100 MW/m/sup 2/ with 1.5 s shots and then selected samples were tested at 60 MW/m/sup 2/ for shots up to 3.5 s. The most basic results from all of these tests is that, as expected, none of the samples fractured. For the KSTAR test, some samples achieved higher heat fluxes than others while their surface temperatures remained below a threshold of 2800/spl deg/C. Other observations presented in the paper are based on post-test examinations of the surface morphologies. The paper was presented in poster form at SOFE99 but not published there and is represented here.","PeriodicalId":44192,"journal":{"name":"NINETEENTH CENTURY MUSIC","volume":"19 1","pages":"345-347"},"PeriodicalIF":0.4,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87377538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"艺术学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Results and status of the Alcator C-Mod tokamak alcatator C-Mod托卡马克实验结果及现状

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027697

S. Wukitch, W. Beck, E. Fitzgerald, R. Granetz, D. Gwinn, M. Grimes, J. Irby, E. Marmar, D. Terry, P. Titus, R. Vieira, S. Wolfe, J. Zaks, S. Bernabei, R. Ellis, L. Gereg, J. Hosea, D. Loesser, G. Schilling, J. Wilson

{"title":"Results and status of the Alcator C-Mod tokamak","authors":"S. Wukitch, W. Beck, E. Fitzgerald, R. Granetz, D. Gwinn, M. Grimes, J. Irby, E. Marmar, D. Terry, P. Titus, R. Vieira, S. Wolfe, J. Zaks, S. Bernabei, R. Ellis, L. Gereg, J. Hosea, D. Loesser, G. Schilling, J. Wilson","doi":"10.1109/FUSION.2002.1027697","DOIUrl":"https://doi.org/10.1109/FUSION.2002.1027697","url":null,"abstract":"Recent Alcator C-Mod experimental campaigns have focused upon the study of the Advanced Tokamak regimes, which includes characterization of the RF heating, the formation and dynamics of internal barriers, H-mode edge pedestal, and divertor and scrape-off physics. The ICRF system has been recently upgraded with the improved performance of the 4-strap antenna. Total ICRF power in excess of 5 MW has been launched successfully into the plasma during this campaign. Due to the compact nature of C-Mod, the power feeds for the antenna are vacuum strip lines. Their orientation, to the tokamak B-field, is governed by maintaining E<15 kV/cm in locations where the RF E-field is parallel to tokamak B-field. Other modifications included improved protection tile grounding and installation of protective shields for Faraday screen ceramic isolators. The antennas also make use of BN protection tiles to eliminate high Z impurities from the antennas. The present empirical power limit results from arcing in a region of the antenna strap where E/spl sim/15 kV/cm and parallel to B and injections from the metallic fasteners used to attach the BN tiles to the antenna.","PeriodicalId":44192,"journal":{"name":"NINETEENTH CENTURY MUSIC","volume":"4 1","pages":"290-295"},"PeriodicalIF":0.4,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72660976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"艺术学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Potential profile measurements by laser-induced fluorescence method in a helium discharge plasma 激光诱导荧光法测量氦放电等离子体电位剖面

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027731

K. Yoshikawa, K. Takiyama, K. Masuda, Y. Yamamoto, H. Toku, K. Nagasaki, H. Hashimoto, A. Nagafuchi, T. Mizutani, M. Ohnishi, H. Horiike

引用次数: 2

High power density ion cyclotron antennas for next step device (applications) 用于下一步器件的高功率密度离子回旋加速器天线(应用)

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027703

G. Bosia, G. Agarici, B. Beaumont, S. Bremond, K. Vulliez

引用次数: 2

Safety and environmental considerations in the selection of fusion power plant design options 核聚变电厂设计方案选择中的安全和环境考虑

IF 0.4 1区艺术学

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI: 10.1109/FUSION.2002.1027654

N. Taylor

引用次数: 1