Coupled plasma-neutral transport model for the scrape-off region

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Analysis of the scrape-off region requires treatment of the plasma transport along and across the field lines and inclusion of the neutral transport effects. A method for modeling the scrape-off region that is presented here uses separate models for each of these aspects that are coupled together through an iteration procedure that requires only minimal numerical effort. The method is applied here to estimate the neutral pumping rates in the pump-limiter and divertor options for a proposed deuterium-tritium (D-T) ignition experiment. High neutral recycling in the vicinity of the neutralizer plate dramatically affects pumping rates for both the pump-limiter and ... continued below

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Pages: 49

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Galambos, J.D.; Peng, Y.K.M. & Heifetz, D. March 1, 1985.

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Description

Analysis of the scrape-off region requires treatment of the plasma transport along and across the field lines and inclusion of the neutral transport effects. A method for modeling the scrape-off region that is presented here uses separate models for each of these aspects that are coupled together through an iteration procedure that requires only minimal numerical effort. The method is applied here to estimate the neutral pumping rates in the pump-limiter and divertor options for a proposed deuterium-tritium (D-T) ignition experiment. High neutral recycling in the vicinity of the neutralizer plate dramatically affects pumping rates for both the pump-limiter and divertor. In both cases, the plasma flow into the channel surrounding the neutralizer plate is greatly reduced by the neutral recycling. The fraction of this flow that is pumped can be large (> 50%), but in general it is dependent on the particular geometry and plasma conditions. It is estimated that pumping speeds approximately greater than 10/sup 5/ L/s are adequate for the exhaust requirements in the pump-limiter and the divertor cases. Also, high neutral recycling on the front surface of the limiter tends to increase the neutral pumping rate.

Physical Description

Pages: 49

Notes

NTIS, PC A03/MF A01.

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  • Other: DE85007559
  • Report No.: ORNL/FEDC-84/6
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/6085181 | External Link
  • Office of Scientific & Technical Information Report Number: 6085181
  • Archival Resource Key: ark:/67531/metadc1109480

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Creation Date

  • March 1, 1985

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

Description Last Updated

  • May 11, 2018, 12:42 p.m.

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Galambos, J.D.; Peng, Y.K.M. & Heifetz, D. Coupled plasma-neutral transport model for the scrape-off region, report, March 1, 1985; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1109480/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.