Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment-β (LTX-β)
A comparison of three sets of Lithium Tokamak Experiment-β (LTX-β) discharges is presented, each with progressively more lithium evaporatively deposited on the stainless steel plasma facing components (PFCs). Multiple observations independently indicate a reduction in recycling with increasing lithi...
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-06-01
|
| Series: | Nuclear Materials and Energy |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179123000479 |
| _version_ | 1797801058464956416 |
|---|---|
| author | A. Maan D.P. Boyle R. Majeski S. Banerjee M. Francisquez R. Kaita G.J. Wilkie W. Capecchi S. Kubota C. Hansen V. Soukhanovskii |
| author_facet | A. Maan D.P. Boyle R. Majeski S. Banerjee M. Francisquez R. Kaita G.J. Wilkie W. Capecchi S. Kubota C. Hansen V. Soukhanovskii |
| author_sort | A. Maan |
| collection | DOAJ |
| description | A comparison of three sets of Lithium Tokamak Experiment-β (LTX-β) discharges is presented, each with progressively more lithium evaporatively deposited on the stainless steel plasma facing components (PFCs). Multiple observations independently indicate a reduction in recycling with increasing lithium deposition - plasma current, discharge duration, density pumpout, and edge electron temperatures increase while plasma density and neutral influx decrease. These measurements make use of several new operational and diagnostics upgrades that have been installed on LTX-β to enable recycling analysis and quantification. Installation of an upgraded Supersonic Gas Injector (SGI) provides access to rapid density pumpout, enabling estimation of effective particle confinement times. Edge density and temperature are measured using a new, movable, low field side, off-midplane, swept single langmuir probe in addition to the LTX-β core Thomson scattering system. The neutral particle influx from the high field side limiter is measured using a hydrogen Lyman-α array. Prospects for future modeling and analysis integrating all of these measurements is discussed. |
| first_indexed | 2024-03-13T04:44:38Z |
| format | Article |
| id | doaj.art-966b1d6562c948368f1e90557ae689f5 |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-03-13T04:44:38Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-966b1d6562c948368f1e90557ae689f52023-06-19T04:28:25ZengElsevierNuclear Materials and Energy2352-17912023-06-0135101408Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment-β (LTX-β)A. Maan0D.P. Boyle1R. Majeski2S. Banerjee3M. Francisquez4R. Kaita5G.J. Wilkie6W. Capecchi7S. Kubota8C. Hansen9V. Soukhanovskii10Princeton Plasma Physics Laboratory, Princeton, NJ, USA; Corresponding author.Princeton Plasma Physics Laboratory, Princeton, NJ, USAPrinceton Plasma Physics Laboratory, Princeton, NJ, USAPrinceton Plasma Physics Laboratory, Princeton, NJ, USAPrinceton Plasma Physics Laboratory, Princeton, NJ, USAPrinceton Plasma Physics Laboratory, Princeton, NJ, USAPrinceton Plasma Physics Laboratory, Princeton, NJ, USAPhysics, University of Wisconsin, Madison, WI, USAPhysics and Astronomy, University of California, Los Angeles, CA, USAAeronautics and Astronautics, University of Washington, Seattle, WA, USA; Applied Physics and Applied Mathematics, Columbia University, New York, NY, USALawrence Livermore National Laboratory, Livermore, CA, USAA comparison of three sets of Lithium Tokamak Experiment-β (LTX-β) discharges is presented, each with progressively more lithium evaporatively deposited on the stainless steel plasma facing components (PFCs). Multiple observations independently indicate a reduction in recycling with increasing lithium deposition - plasma current, discharge duration, density pumpout, and edge electron temperatures increase while plasma density and neutral influx decrease. These measurements make use of several new operational and diagnostics upgrades that have been installed on LTX-β to enable recycling analysis and quantification. Installation of an upgraded Supersonic Gas Injector (SGI) provides access to rapid density pumpout, enabling estimation of effective particle confinement times. Edge density and temperature are measured using a new, movable, low field side, off-midplane, swept single langmuir probe in addition to the LTX-β core Thomson scattering system. The neutral particle influx from the high field side limiter is measured using a hydrogen Lyman-α array. Prospects for future modeling and analysis integrating all of these measurements is discussed.http://www.sciencedirect.com/science/article/pii/S2352179123000479Lithium wallPlasma material interactionsRecycling |
| spellingShingle | A. Maan D.P. Boyle R. Majeski S. Banerjee M. Francisquez R. Kaita G.J. Wilkie W. Capecchi S. Kubota C. Hansen V. Soukhanovskii Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment-β (LTX-β) Nuclear Materials and Energy Lithium wall Plasma material interactions Recycling |
| title | Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment-β (LTX-β) |
| title_full | Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment-β (LTX-β) |
| title_fullStr | Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment-β (LTX-β) |
| title_full_unstemmed | Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment-β (LTX-β) |
| title_short | Improved neutral and plasma density control with increasing lithium wall coatings in the Lithium Tokamak Experiment-β (LTX-β) |
| title_sort | improved neutral and plasma density control with increasing lithium wall coatings in the lithium tokamak experiment β ltx β |
| topic | Lithium wall Plasma material interactions Recycling |
| url | http://www.sciencedirect.com/science/article/pii/S2352179123000479 |
| work_keys_str_mv | AT amaan improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT dpboyle improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT rmajeski improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT sbanerjee improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT mfrancisquez improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT rkaita improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT gjwilkie improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT wcapecchi improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT skubota improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT chansen improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb AT vsoukhanovskii improvedneutralandplasmadensitycontrolwithincreasinglithiumwallcoatingsinthelithiumtokamakexperimentbltxb |