摘要:

AbstractMeasured plasma density and temperature profiles have been used as input to a 3‐D Monte Carlo neutral code, NIMBUS, to calculate an effective recycling velocity of neutral deuterium from the JET limiters of ∼1.5×104m/s (2.5 eV). This result quantitatively explains the observed relation between edge density and central density in JET ohmic discharges. It is found that ≲ 30% of the total ionization occurs within t

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280432

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractTwo dimensional calculations of impurity transport in a high recycling divertor scrape‐off region have been made with an updated version of the ZTRANS Monte Carlo computer code. The calculations use plasma parameters for the Doublet 3 divertor, as computed by the Planet Fluid Transport Code. The effects of electric field, particle drift velocities, and thermal forces are included in the calculations. For all impurity species studied, it is found that impurity transport is dominated by frictional forces, over most of the scrape‐off region. Light impurities, however, impinge substantially closer to the divertor plate center than do heavy impurities, which tend to impinge at the outer plate bound

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280433

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280434

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280435

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280436

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280437

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractA two‐dimensional Monte Carlo impurity atom/ion code, LIM, was used to model a number of DITE and JET experiments including (a) the ratio of charge states collected by the Matthews probe in DITE, (b) the net erosion pattern on the 1986 JET limiters, and (c) radial and toroidal CI, CII, CIII cloud shapes in the vicinity of DITE limiter

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280438

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractA Monte Carlo code, LIM (LimiterImpurity), is used to track impurity atoms and ions toroidally/radially in the vicinity of a limiter. As an illustration of the use of LIM, two cases are analysed: physical sputtering and sublimation of carbon from the limiter. For the same total impurity production from the limiter, physical sputtering is found to be approximately three times more efficient at contaminating the plasma centre as sublimation. A number of further quantities, which can be compared with experiment, are computed: (a) the toroidal/radial shapes of the impurity clouds of successive ionization states, (b) the average impurity ion temperature in each cloud, (c) the ratio of the different charge states of the impurities returning to the limiter, their spatial distribution and impact energy, and (d) total radiated power.

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280439

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractImpurity modelling of the Scrape‐Off Layer, SOL, is reviewed. Simple analytic models are sometimes adequate for relating central impurity levels to edge plasma conditions and for explaining the patterns of net erosion/deposition found on limiters. More sophisticated approaches, which are also necessary, are categorized and reviewed. A plea is made for the acquisition of a more comprehensive data base of edge plasma properties since reliable impurity modelling appears to be dependent on more extensive use of experimental inpu

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280440

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0863-1042    

DOI:10.1002/ctpp.2150280401

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY