On the measurement of the threshold electric field for runaway electron generation in the Frascati Tokamak Upgrade
Experiments have been carried out to evaluate the threshold electric field for runaway generation during the flat-top phase of ohmic discharges in the Frascati Tokamak Upgrade tokamak. An investigation of the conditions for runaway electron generation and suppression has been performed for a wide ra...
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| Veröffentlicht in: | Physics of plasmas 2016-12, Vol.23 (12) |
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| creator | Popovic, Z. Esposito, B. Martín-Solís, J. R. Bin, W. Buratti, P. Carnevale, D. Causa, F. Gospodarczyk, M. Marocco, D. Ramogida, G. Riva, M. |
| description | Experiments have been carried out to evaluate the threshold electric field for runaway generation during the flat-top phase of ohmic discharges in the Frascati Tokamak Upgrade tokamak. An investigation of the conditions for runaway electron generation and suppression has been performed for a wide range of plasma parameter values. The measured threshold electric field is found to be significantly larger (
∼
2
−
5
times) than predicted by the relativistic collissional theory of runaway generation,
E
R
=
n
e
e
3
ln
Λ
/
4
π
ε
0
2
m
e
c
2
, and can be explained to a great extent by an increase of the critical electric field due to the effect of the electron synchrotron radiation losses. These findings are consistent with the results of an ITPA joint experiment to study the onset, growth, and decay of relativistic runaway electrons [Granetz et al., Phys. Plasmas 21, 072506 (2014)]. Confirmation of these results for disruptions with high electric field might imply significantly lower requirements on electron densities for suppression and prevention of runaway formation in ITER. |
| doi_str_mv | 10.1063/1.4968839 |
| format | Article |
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∼
2
−
5
times) than predicted by the relativistic collissional theory of runaway generation,
E
R
=
n
e
e
3
ln
Λ
/
4
π
ε
0
2
m
e
c
2
, and can be explained to a great extent by an increase of the critical electric field due to the effect of the electron synchrotron radiation losses. These findings are consistent with the results of an ITPA joint experiment to study the onset, growth, and decay of relativistic runaway electrons [Granetz et al., Phys. Plasmas 21, 072506 (2014)]. Confirmation of these results for disruptions with high electric field might imply significantly lower requirements on electron densities for suppression and prevention of runaway formation in ITER.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.4968839</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Electric fields ; Electrons ; Plasma physics ; Plasmas (physics) ; Relativism ; Relativistic effects ; Relativistic theory ; Synchrotron radiation ; Tokamak devices</subject><ispartof>Physics of plasmas, 2016-12, Vol.23 (12)</ispartof><rights>Author(s)</rights><rights>2016 Author(s). Published by AIP Publishing.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c362t-3622534a0f784f63019519de889eebfc42783a60b9f86dd785df300f62e1e5bd3</citedby><cites>FETCH-LOGICAL-c362t-3622534a0f784f63019519de889eebfc42783a60b9f86dd785df300f62e1e5bd3</cites><orcidid>0000-0003-2045-0001</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/pop/article-lookup/doi/10.1063/1.4968839$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>314,780,784,794,4512,27924,27925,76384</link.rule.ids></links><search><creatorcontrib>Popovic, Z.</creatorcontrib><creatorcontrib>Esposito, B.</creatorcontrib><creatorcontrib>Martín-Solís, J. R.</creatorcontrib><creatorcontrib>Bin, W.</creatorcontrib><creatorcontrib>Buratti, P.</creatorcontrib><creatorcontrib>Carnevale, D.</creatorcontrib><creatorcontrib>Causa, F.</creatorcontrib><creatorcontrib>Gospodarczyk, M.</creatorcontrib><creatorcontrib>Marocco, D.</creatorcontrib><creatorcontrib>Ramogida, G.</creatorcontrib><creatorcontrib>Riva, M.</creatorcontrib><title>On the measurement of the threshold electric field for runaway electron generation in the Frascati Tokamak Upgrade</title><title>Physics of plasmas</title><description>Experiments have been carried out to evaluate the threshold electric field for runaway generation during the flat-top phase of ohmic discharges in the Frascati Tokamak Upgrade tokamak. An investigation of the conditions for runaway electron generation and suppression has been performed for a wide range of plasma parameter values. The measured threshold electric field is found to be significantly larger (
∼
2
−
5
times) than predicted by the relativistic collissional theory of runaway generation,
E
R
=
n
e
e
3
ln
Λ
/
4
π
ε
0
2
m
e
c
2
, and can be explained to a great extent by an increase of the critical electric field due to the effect of the electron synchrotron radiation losses. These findings are consistent with the results of an ITPA joint experiment to study the onset, growth, and decay of relativistic runaway electrons [Granetz et al., Phys. Plasmas 21, 072506 (2014)]. Confirmation of these results for disruptions with high electric field might imply significantly lower requirements on electron densities for suppression and prevention of runaway formation in ITER.</description><subject>Electric fields</subject><subject>Electrons</subject><subject>Plasma physics</subject><subject>Plasmas (physics)</subject><subject>Relativism</subject><subject>Relativistic effects</subject><subject>Relativistic theory</subject><subject>Synchrotron radiation</subject><subject>Tokamak devices</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LwzAYx4MoOKcHv0HAk0Jn0rRpepThVBjssoG3kLVPtm5rU5NU2bc3W4ceBC_P64__84LQLSUjSjh7pKMk50Kw_AwNKBF5lPEsOT_EGYk4T94v0ZVzG0JIwlMxQHbWYL8GXINynYUaGo-NPpb82oJbm12JYQeFt1WBdQUh1cZi2zXqS-1PLdPgFTRgla9CWPWSE6tcESp4braqVlu8aFdWlXCNLrTaObg5-SFaTJ7n49doOnt5Gz9No4Lx2EfBxClLFNGZSDRnhOYpzUsQIgdY6iKJM8EUJ8tcC16WmUhLzQjRPAYK6bJkQ3TX67bWfHTgvNyYzjZhpIxpTFOWxowG6r6nCmucs6Bla6ta2b2kRB5eKqk8vTSwDz3risofb_2BP439BWUbVvkH_qv8DYV1hbM</recordid><startdate>201612</startdate><enddate>201612</enddate><creator>Popovic, Z.</creator><creator>Esposito, B.</creator><creator>Martín-Solís, J. R.</creator><creator>Bin, W.</creator><creator>Buratti, P.</creator><creator>Carnevale, D.</creator><creator>Causa, F.</creator><creator>Gospodarczyk, M.</creator><creator>Marocco, D.</creator><creator>Ramogida, G.</creator><creator>Riva, M.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0003-2045-0001</orcidid></search><sort><creationdate>201612</creationdate><title>On the measurement of the threshold electric field for runaway electron generation in the Frascati Tokamak Upgrade</title><author>Popovic, Z. ; Esposito, B. ; Martín-Solís, J. R. ; Bin, W. ; Buratti, P. ; Carnevale, D. ; Causa, F. ; Gospodarczyk, M. ; Marocco, D. ; Ramogida, G. ; Riva, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c362t-3622534a0f784f63019519de889eebfc42783a60b9f86dd785df300f62e1e5bd3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Electric fields</topic><topic>Electrons</topic><topic>Plasma physics</topic><topic>Plasmas (physics)</topic><topic>Relativism</topic><topic>Relativistic effects</topic><topic>Relativistic theory</topic><topic>Synchrotron radiation</topic><topic>Tokamak devices</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Popovic, Z.</creatorcontrib><creatorcontrib>Esposito, B.</creatorcontrib><creatorcontrib>Martín-Solís, J. R.</creatorcontrib><creatorcontrib>Bin, W.</creatorcontrib><creatorcontrib>Buratti, P.</creatorcontrib><creatorcontrib>Carnevale, D.</creatorcontrib><creatorcontrib>Causa, F.</creatorcontrib><creatorcontrib>Gospodarczyk, M.</creatorcontrib><creatorcontrib>Marocco, D.</creatorcontrib><creatorcontrib>Ramogida, G.</creatorcontrib><creatorcontrib>Riva, M.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physics of plasmas</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Popovic, Z.</au><au>Esposito, B.</au><au>Martín-Solís, J. R.</au><au>Bin, W.</au><au>Buratti, P.</au><au>Carnevale, D.</au><au>Causa, F.</au><au>Gospodarczyk, M.</au><au>Marocco, D.</au><au>Ramogida, G.</au><au>Riva, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>On the measurement of the threshold electric field for runaway electron generation in the Frascati Tokamak Upgrade</atitle><jtitle>Physics of plasmas</jtitle><date>2016-12</date><risdate>2016</risdate><volume>23</volume><issue>12</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>Experiments have been carried out to evaluate the threshold electric field for runaway generation during the flat-top phase of ohmic discharges in the Frascati Tokamak Upgrade tokamak. An investigation of the conditions for runaway electron generation and suppression has been performed for a wide range of plasma parameter values. The measured threshold electric field is found to be significantly larger (
∼
2
−
5
times) than predicted by the relativistic collissional theory of runaway generation,
E
R
=
n
e
e
3
ln
Λ
/
4
π
ε
0
2
m
e
c
2
, and can be explained to a great extent by an increase of the critical electric field due to the effect of the electron synchrotron radiation losses. These findings are consistent with the results of an ITPA joint experiment to study the onset, growth, and decay of relativistic runaway electrons [Granetz et al., Phys. Plasmas 21, 072506 (2014)]. Confirmation of these results for disruptions with high electric field might imply significantly lower requirements on electron densities for suppression and prevention of runaway formation in ITER.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4968839</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0003-2045-0001</orcidid><oa>free_for_read</oa></addata></record> |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Electric fields Electrons Plasma physics Plasmas (physics) Relativism Relativistic effects Relativistic theory Synchrotron radiation Tokamak devices |
| title | On the measurement of the threshold electric field for runaway electron generation in the Frascati Tokamak Upgrade |
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