Observations of neutral depletion and plasma acceleration in a flowing high-power argon helicon plasma
Neutral depletion effects are observed in a steady-state flowing argon helicon plasma with a magnetic nozzle for high rf input powers (up to 3 kW ). Noninvasive diagnostics including 105 GHz microwave interferometry and optical spectroscopy with collisional-radiative modeling are used to measure the...
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| Veröffentlicht in: | Physics of plasmas 2008-07, Vol.15 (7), p.072115-072115-12 |
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| container_end_page | 072115-12 |
|---|---|
| container_issue | 7 |
| container_start_page | 072115 |
| container_title | Physics of plasmas |
| container_volume | 15 |
| creator | Denning, C. Mark Wiebold, Matt Scharer, John E. |
| description | Neutral depletion effects are observed in a steady-state flowing argon helicon plasma with a magnetic nozzle for high rf input powers (up to
3
kW
). Noninvasive diagnostics including
105
GHz
microwave interferometry and optical spectroscopy with collisional-radiative modeling are used to measure the electron density
(
n
e
)
, electron temperature
(
T
e
)
, and neutral density
(
n
n
)
. A region of weak neutral depletion is observed upstream of the antenna where increasing rf power leads to increased electron density (up to
n
e
=
1.6
×
10
13
cm
−
3
) while
T
e
remains essentially constant and low
(
1.7
–
2.0
eV
)
. The downstream region exhibits profound neutral depletion (maximum 92% line-averaged ionization), where
T
e
rises linearly with increasing rf power (up to
4.9
eV
) and
n
e
remains constrained (below
6.5
×
10
12
cm
−
3
). Flux considerations indicate accelerated plasma flow (Mach 0.24) through the antenna region due to an axial pressure gradient with reduced collisional drag from neutral depletion. |
| doi_str_mv | 10.1063/1.2950301 |
| format | Article |
| fullrecord | <record><control><sourceid>scitation_osti_</sourceid><recordid>TN_cdi_scitation_primary_10_1063_1_2950301</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>pop</sourcerecordid><originalsourceid>FETCH-LOGICAL-c448t-2ed82e03ec98876a81c1321b40392d6c9af4557e4c2509fd70f31c6f4ddd7bd13</originalsourceid><addsrcrecordid>eNqNkEtLxDAUhYMoOI4u_AcBVwod82qabgQZfMHAbBTchUwe00inKUmdwX9vOxV0o7i6l3u-e7j3AHCO0QwjTq_xjJQ5oggfgAlGoswKXrDDoS9Qxjl7PQYnKb0hhBjPxQS45SrZuFWdD02CwcHGvndR1dDYtrbDFKrGwLZWaaOg0trWNu5p6HsJujrsfLOGlV9XWRt2NkIV171a2drrvo6bp-DIqTrZs686BS_3d8_zx2yxfHia3y4yzZjoMmKNIBZRq0shCq4E1pgSvGKIlsRwXSrH8rywTJMclc4UyFGsuWPGmGJlMJ2Ci9E3pM7LpH1nddWf0VjdSYIJFyVjPXU5UjqGlKJ1so1-o-KHxEgOMUosv2Ls2ZuRHcz2j_8O_8xSBieHLHuDq38b_AVvQ_wGZWsc_QTc4JeM</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Observations of neutral depletion and plasma acceleration in a flowing high-power argon helicon plasma</title><source>AIP Journals Complete</source><source>AIP Digital Archive</source><creator>Denning, C. Mark ; Wiebold, Matt ; Scharer, John E.</creator><creatorcontrib>Denning, C. Mark ; Wiebold, Matt ; Scharer, John E.</creatorcontrib><description>Neutral depletion effects are observed in a steady-state flowing argon helicon plasma with a magnetic nozzle for high rf input powers (up to
3
kW
). Noninvasive diagnostics including
105
GHz
microwave interferometry and optical spectroscopy with collisional-radiative modeling are used to measure the electron density
(
n
e
)
, electron temperature
(
T
e
)
, and neutral density
(
n
n
)
. A region of weak neutral depletion is observed upstream of the antenna where increasing rf power leads to increased electron density (up to
n
e
=
1.6
×
10
13
cm
−
3
) while
T
e
remains essentially constant and low
(
1.7
–
2.0
eV
)
. The downstream region exhibits profound neutral depletion (maximum 92% line-averaged ionization), where
T
e
rises linearly with increasing rf power (up to
4.9
eV
) and
n
e
remains constrained (below
6.5
×
10
12
cm
−
3
). Flux considerations indicate accelerated plasma flow (Mach 0.24) through the antenna region due to an axial pressure gradient with reduced collisional drag from neutral depletion.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.2950301</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>United States: American Institute of Physics</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; ANTENNAS ; ARGON ; ELECTRON DENSITY ; ELECTRON TEMPERATURE ; INTERFEROMETRY ; MICROWAVE RADIATION ; NEUTRON SPECTROSCOPY ; PLASMA ACCELERATION ; PLASMA DIAGNOSTICS</subject><ispartof>Physics of plasmas, 2008-07, Vol.15 (7), p.072115-072115-12</ispartof><rights>American Institute of Physics</rights><rights>2008 American Institute of Physics</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c448t-2ed82e03ec98876a81c1321b40392d6c9af4557e4c2509fd70f31c6f4ddd7bd13</citedby><cites>FETCH-LOGICAL-c448t-2ed82e03ec98876a81c1321b40392d6c9af4557e4c2509fd70f31c6f4ddd7bd13</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/pop/article-lookup/doi/10.1063/1.2950301$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>230,314,780,784,794,885,1559,4511,27923,27924,76255,76261</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/21268944$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Denning, C. Mark</creatorcontrib><creatorcontrib>Wiebold, Matt</creatorcontrib><creatorcontrib>Scharer, John E.</creatorcontrib><title>Observations of neutral depletion and plasma acceleration in a flowing high-power argon helicon plasma</title><title>Physics of plasmas</title><description>Neutral depletion effects are observed in a steady-state flowing argon helicon plasma with a magnetic nozzle for high rf input powers (up to
3
kW
). Noninvasive diagnostics including
105
GHz
microwave interferometry and optical spectroscopy with collisional-radiative modeling are used to measure the electron density
(
n
e
)
, electron temperature
(
T
e
)
, and neutral density
(
n
n
)
. A region of weak neutral depletion is observed upstream of the antenna where increasing rf power leads to increased electron density (up to
n
e
=
1.6
×
10
13
cm
−
3
) while
T
e
remains essentially constant and low
(
1.7
–
2.0
eV
)
. The downstream region exhibits profound neutral depletion (maximum 92% line-averaged ionization), where
T
e
rises linearly with increasing rf power (up to
4.9
eV
) and
n
e
remains constrained (below
6.5
×
10
12
cm
−
3
). Flux considerations indicate accelerated plasma flow (Mach 0.24) through the antenna region due to an axial pressure gradient with reduced collisional drag from neutral depletion.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>ANTENNAS</subject><subject>ARGON</subject><subject>ELECTRON DENSITY</subject><subject>ELECTRON TEMPERATURE</subject><subject>INTERFEROMETRY</subject><subject>MICROWAVE RADIATION</subject><subject>NEUTRON SPECTROSCOPY</subject><subject>PLASMA ACCELERATION</subject><subject>PLASMA DIAGNOSTICS</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNqNkEtLxDAUhYMoOI4u_AcBVwod82qabgQZfMHAbBTchUwe00inKUmdwX9vOxV0o7i6l3u-e7j3AHCO0QwjTq_xjJQ5oggfgAlGoswKXrDDoS9Qxjl7PQYnKb0hhBjPxQS45SrZuFWdD02CwcHGvndR1dDYtrbDFKrGwLZWaaOg0trWNu5p6HsJujrsfLOGlV9XWRt2NkIV171a2drrvo6bp-DIqTrZs686BS_3d8_zx2yxfHia3y4yzZjoMmKNIBZRq0shCq4E1pgSvGKIlsRwXSrH8rywTJMclc4UyFGsuWPGmGJlMJ2Ci9E3pM7LpH1nddWf0VjdSYIJFyVjPXU5UjqGlKJ1so1-o-KHxEgOMUosv2Ls2ZuRHcz2j_8O_8xSBieHLHuDq38b_AVvQ_wGZWsc_QTc4JeM</recordid><startdate>20080701</startdate><enddate>20080701</enddate><creator>Denning, C. Mark</creator><creator>Wiebold, Matt</creator><creator>Scharer, John E.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20080701</creationdate><title>Observations of neutral depletion and plasma acceleration in a flowing high-power argon helicon plasma</title><author>Denning, C. Mark ; Wiebold, Matt ; Scharer, John E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c448t-2ed82e03ec98876a81c1321b40392d6c9af4557e4c2509fd70f31c6f4ddd7bd13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><topic>ANTENNAS</topic><topic>ARGON</topic><topic>ELECTRON DENSITY</topic><topic>ELECTRON TEMPERATURE</topic><topic>INTERFEROMETRY</topic><topic>MICROWAVE RADIATION</topic><topic>NEUTRON SPECTROSCOPY</topic><topic>PLASMA ACCELERATION</topic><topic>PLASMA DIAGNOSTICS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Denning, C. Mark</creatorcontrib><creatorcontrib>Wiebold, Matt</creatorcontrib><creatorcontrib>Scharer, John E.</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Denning, C. Mark</au><au>Wiebold, Matt</au><au>Scharer, John E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Observations of neutral depletion and plasma acceleration in a flowing high-power argon helicon plasma</atitle><jtitle>Physics of plasmas</jtitle><date>2008-07-01</date><risdate>2008</risdate><volume>15</volume><issue>7</issue><spage>072115</spage><epage>072115-12</epage><pages>072115-072115-12</pages><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>Neutral depletion effects are observed in a steady-state flowing argon helicon plasma with a magnetic nozzle for high rf input powers (up to
3
kW
). Noninvasive diagnostics including
105
GHz
microwave interferometry and optical spectroscopy with collisional-radiative modeling are used to measure the electron density
(
n
e
)
, electron temperature
(
T
e
)
, and neutral density
(
n
n
)
. A region of weak neutral depletion is observed upstream of the antenna where increasing rf power leads to increased electron density (up to
n
e
=
1.6
×
10
13
cm
−
3
) while
T
e
remains essentially constant and low
(
1.7
–
2.0
eV
)
. The downstream region exhibits profound neutral depletion (maximum 92% line-averaged ionization), where
T
e
rises linearly with increasing rf power (up to
4.9
eV
) and
n
e
remains constrained (below
6.5
×
10
12
cm
−
3
). Flux considerations indicate accelerated plasma flow (Mach 0.24) through the antenna region due to an axial pressure gradient with reduced collisional drag from neutral depletion.</abstract><cop>United States</cop><pub>American Institute of Physics</pub><doi>10.1063/1.2950301</doi><tpages>12</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1070-664X |
| ispartof | Physics of plasmas, 2008-07, Vol.15 (7), p.072115-072115-12 |
| issn | 1070-664X 1089-7674 |
| language | eng |
| recordid | cdi_scitation_primary_10_1063_1_2950301 |
| source | AIP Journals Complete; AIP Digital Archive |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY ANTENNAS ARGON ELECTRON DENSITY ELECTRON TEMPERATURE INTERFEROMETRY MICROWAVE RADIATION NEUTRON SPECTROSCOPY PLASMA ACCELERATION PLASMA DIAGNOSTICS |
| title | Observations of neutral depletion and plasma acceleration in a flowing high-power argon helicon plasma |
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