Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code

Data-constrained interpretative analyses of plasma transport in convection dominated helicon discharges in the Proto-MPEX linear device, and predictive calculations with additional Electron Cyclotron Heating/Electron Bernstein Wave (ECH/EBW) heating, are reported. The B2.5-Eirene code, in which the...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Physics of plasmas 2017-11, Vol.24 (11)
Hauptverfasser: Owen, Larry W., Rapp, Juergen, Canik, John, Lore, Jeremy D.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
container_end_page
container_issue 11
container_start_page
container_title Physics of plasmas
container_volume 24
creator Owen, Larry W.
Rapp, Juergen
Canik, John
Lore, Jeremy D.
description Data-constrained interpretative analyses of plasma transport in convection dominated helicon discharges in the Proto-MPEX linear device, and predictive calculations with additional Electron Cyclotron Heating/Electron Bernstein Wave (ECH/EBW) heating, are reported. The B2.5-Eirene code, in which the multi-fluid plasma code B2.5 is coupled to the kinetic Monte Carlo neutrals code Eirene, is used to fit double Langmuir probe measurements and fast camera data in front of a stainless-steel target. The absorbed helicon and ECH power (11 kW) and spatially constant anomalous transport coefficients that are deduced from fitting of the probe and optical data are additionally used for predictive simulations of complete axial distributions of the densities, temperatures, plasma flow velocities, particle and energy fluxes, and possible effects of alternate fueling and pumping scenarios. The somewhat hollow electron density and temperature radial profiles from the probe data suggest that Trivelpiece-Gould wave absorption is the dominant helicon electron heating source in the discharges analyzed here. There is no external ion heating, but the corresponding calculated ion temperature radial profile is not hollow. Rather it reflects ion heating by the electron-ion equilibration terms in the energy balance equations and ion radial transport resulting from the hollow density profile. With the absorbed power and the transport model deduced from fitting the sheath limited discharge data, calculated conduction limited higher recycling conditions were produced by reducing the pumping and increasing the gas fueling rate, resulting in an approximate doubling of the target ion flux and reduction of the target heat flux.
format Article
fullrecord <record><control><sourceid>osti</sourceid><recordid>TN_cdi_osti_scitechconnect_1659644</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>1659644</sourcerecordid><originalsourceid>FETCH-osti_scitechconnect_16596443</originalsourceid><addsrcrecordid>eNqNjc0KwjAQhHNQsP68w-K9ErWNelUqXoQeeuitlHTbrLRZSYK-vhV8AE8DMx_fTES0lQcZK5WUMzH3_iGlTFR6jAQWrrb-yS7AwA32ZDvgFjTbF-pAbKHhgWwdsAEzzvrbkNemdh16IAu548DxPc9KeFMwEAzCebdJ44wcWhxVDS7FtK17j6tfLsT6mhWXW8w-UOU1BdRmVNvxs9qq9KSSZP8X9AFYNkV2</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code</title><source>AIP Journals Complete</source><source>Alma/SFX Local Collection</source><creator>Owen, Larry W. ; Rapp, Juergen ; Canik, John ; Lore, Jeremy D.</creator><creatorcontrib>Owen, Larry W. ; Rapp, Juergen ; Canik, John ; Lore, Jeremy D. ; Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)</creatorcontrib><description>Data-constrained interpretative analyses of plasma transport in convection dominated helicon discharges in the Proto-MPEX linear device, and predictive calculations with additional Electron Cyclotron Heating/Electron Bernstein Wave (ECH/EBW) heating, are reported. The B2.5-Eirene code, in which the multi-fluid plasma code B2.5 is coupled to the kinetic Monte Carlo neutrals code Eirene, is used to fit double Langmuir probe measurements and fast camera data in front of a stainless-steel target. The absorbed helicon and ECH power (11 kW) and spatially constant anomalous transport coefficients that are deduced from fitting of the probe and optical data are additionally used for predictive simulations of complete axial distributions of the densities, temperatures, plasma flow velocities, particle and energy fluxes, and possible effects of alternate fueling and pumping scenarios. The somewhat hollow electron density and temperature radial profiles from the probe data suggest that Trivelpiece-Gould wave absorption is the dominant helicon electron heating source in the discharges analyzed here. There is no external ion heating, but the corresponding calculated ion temperature radial profile is not hollow. Rather it reflects ion heating by the electron-ion equilibration terms in the energy balance equations and ion radial transport resulting from the hollow density profile. With the absorbed power and the transport model deduced from fitting the sheath limited discharge data, calculated conduction limited higher recycling conditions were produced by reducing the pumping and increasing the gas fueling rate, resulting in an approximate doubling of the target ion flux and reduction of the target heat flux.</description><identifier>ISSN: 1070-664X</identifier><language>eng</language><publisher>United States: American Institute of Physics (AIP)</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><ispartof>Physics of plasmas, 2017-11, Vol.24 (11)</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000000169346681 ; 000000020948852X ; 000000029192465X ; 0000000327859280</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885</link.rule.ids><backlink>$$Uhttps://www.osti.gov/servlets/purl/1659644$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Owen, Larry W.</creatorcontrib><creatorcontrib>Rapp, Juergen</creatorcontrib><creatorcontrib>Canik, John</creatorcontrib><creatorcontrib>Lore, Jeremy D.</creatorcontrib><creatorcontrib>Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)</creatorcontrib><title>Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code</title><title>Physics of plasmas</title><description>Data-constrained interpretative analyses of plasma transport in convection dominated helicon discharges in the Proto-MPEX linear device, and predictive calculations with additional Electron Cyclotron Heating/Electron Bernstein Wave (ECH/EBW) heating, are reported. The B2.5-Eirene code, in which the multi-fluid plasma code B2.5 is coupled to the kinetic Monte Carlo neutrals code Eirene, is used to fit double Langmuir probe measurements and fast camera data in front of a stainless-steel target. The absorbed helicon and ECH power (11 kW) and spatially constant anomalous transport coefficients that are deduced from fitting of the probe and optical data are additionally used for predictive simulations of complete axial distributions of the densities, temperatures, plasma flow velocities, particle and energy fluxes, and possible effects of alternate fueling and pumping scenarios. The somewhat hollow electron density and temperature radial profiles from the probe data suggest that Trivelpiece-Gould wave absorption is the dominant helicon electron heating source in the discharges analyzed here. There is no external ion heating, but the corresponding calculated ion temperature radial profile is not hollow. Rather it reflects ion heating by the electron-ion equilibration terms in the energy balance equations and ion radial transport resulting from the hollow density profile. With the absorbed power and the transport model deduced from fitting the sheath limited discharge data, calculated conduction limited higher recycling conditions were produced by reducing the pumping and increasing the gas fueling rate, resulting in an approximate doubling of the target ion flux and reduction of the target heat flux.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><issn>1070-664X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqNjc0KwjAQhHNQsP68w-K9ErWNelUqXoQeeuitlHTbrLRZSYK-vhV8AE8DMx_fTES0lQcZK5WUMzH3_iGlTFR6jAQWrrb-yS7AwA32ZDvgFjTbF-pAbKHhgWwdsAEzzvrbkNemdh16IAu548DxPc9KeFMwEAzCebdJ44wcWhxVDS7FtK17j6tfLsT6mhWXW8w-UOU1BdRmVNvxs9qq9KSSZP8X9AFYNkV2</recordid><startdate>20171114</startdate><enddate>20171114</enddate><creator>Owen, Larry W.</creator><creator>Rapp, Juergen</creator><creator>Canik, John</creator><creator>Lore, Jeremy D.</creator><general>American Institute of Physics (AIP)</general><scope>OIOZB</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000000169346681</orcidid><orcidid>https://orcid.org/000000020948852X</orcidid><orcidid>https://orcid.org/000000029192465X</orcidid><orcidid>https://orcid.org/0000000327859280</orcidid></search><sort><creationdate>20171114</creationdate><title>Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code</title><author>Owen, Larry W. ; Rapp, Juergen ; Canik, John ; Lore, Jeremy D.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-osti_scitechconnect_16596443</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Owen, Larry W.</creatorcontrib><creatorcontrib>Rapp, Juergen</creatorcontrib><creatorcontrib>Canik, John</creatorcontrib><creatorcontrib>Lore, Jeremy D.</creatorcontrib><creatorcontrib>Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)</creatorcontrib><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Owen, Larry W.</au><au>Rapp, Juergen</au><au>Canik, John</au><au>Lore, Jeremy D.</au><aucorp>Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code</atitle><jtitle>Physics of plasmas</jtitle><date>2017-11-14</date><risdate>2017</risdate><volume>24</volume><issue>11</issue><issn>1070-664X</issn><abstract>Data-constrained interpretative analyses of plasma transport in convection dominated helicon discharges in the Proto-MPEX linear device, and predictive calculations with additional Electron Cyclotron Heating/Electron Bernstein Wave (ECH/EBW) heating, are reported. The B2.5-Eirene code, in which the multi-fluid plasma code B2.5 is coupled to the kinetic Monte Carlo neutrals code Eirene, is used to fit double Langmuir probe measurements and fast camera data in front of a stainless-steel target. The absorbed helicon and ECH power (11 kW) and spatially constant anomalous transport coefficients that are deduced from fitting of the probe and optical data are additionally used for predictive simulations of complete axial distributions of the densities, temperatures, plasma flow velocities, particle and energy fluxes, and possible effects of alternate fueling and pumping scenarios. The somewhat hollow electron density and temperature radial profiles from the probe data suggest that Trivelpiece-Gould wave absorption is the dominant helicon electron heating source in the discharges analyzed here. There is no external ion heating, but the corresponding calculated ion temperature radial profile is not hollow. Rather it reflects ion heating by the electron-ion equilibration terms in the energy balance equations and ion radial transport resulting from the hollow density profile. With the absorbed power and the transport model deduced from fitting the sheath limited discharge data, calculated conduction limited higher recycling conditions were produced by reducing the pumping and increasing the gas fueling rate, resulting in an approximate doubling of the target ion flux and reduction of the target heat flux.</abstract><cop>United States</cop><pub>American Institute of Physics (AIP)</pub><orcidid>https://orcid.org/0000000169346681</orcidid><orcidid>https://orcid.org/000000020948852X</orcidid><orcidid>https://orcid.org/000000029192465X</orcidid><orcidid>https://orcid.org/0000000327859280</orcidid><oa>free_for_read</oa></addata></record>
fulltext fulltext
identifier ISSN: 1070-664X
ispartof Physics of plasmas, 2017-11, Vol.24 (11)
issn 1070-664X
language eng
recordid cdi_osti_scitechconnect_1659644
source AIP Journals Complete; Alma/SFX Local Collection
subjects 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
title Transport modeling of convection dominated helicon discharges in Proto-MPEX with the B2.5-Eirene code
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-28T10%3A20%3A01IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-osti&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Transport%20modeling%20of%20convection%20dominated%20helicon%20discharges%20in%20Proto-MPEX%20with%20the%20B2.5-Eirene%20code&rft.jtitle=Physics%20of%20plasmas&rft.au=Owen,%20Larry%20W.&rft.aucorp=Oak%20Ridge%20National%20Laboratory%20(ORNL),%20Oak%20Ridge,%20TN%20(United%20States)&rft.date=2017-11-14&rft.volume=24&rft.issue=11&rft.issn=1070-664X&rft_id=info:doi/&rft_dat=%3Costi%3E1659644%3C/osti%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_id=info:pmid/&rfr_iscdi=true