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TJ-II: Two dimensional distribution of plasma potential and density: Difference between revisions

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TJ-II: Two dimensional distribution of plasma potential and density (view source)

Revision as of 17:10, 21 January 2022

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The first experiments aimed at obtaining the 2D distribution of plasma potential were performed in TJ-II using Heavy Ion Beam Probe (HIBP) with the variation of two parameters: plasma entrance angle and the energy of the Cs+ probing beam in the range 128-148 keV <ref>R. Sharma et al., Physics of Plasmas 27, 062502 (2020)</ref>.  
The first experiments aimed at obtaining the 2D distribution of plasma potential were performed in TJ-II using Heavy Ion Beam Probe (HIBP) with the variation of two parameters: plasma entrance angle and the energy of the Cs+ probing beam in the range 128-148 keV <ref>R. Sharma et al., Physics of Plasmas 27, 062502 (2020)</ref>.  


During 2019-20 the dual HIBP system has been used to experimentally characterize the 2D structures of plasma potential and density mean-value distributions and fluctuations in TJ-II mapped by varying the beam energy in a wider range 100 -150 keV.
During 2021 HIBP was extended to 176 keV with a beam current up to 300 μA <ref>A. Melnikov et al., PPCF (2021) submitted</ref>


The goal of this proposal is to expand the HIBP energy range [80 - 200 keV] to explore the whole TJ-II poloidal cross-section.
The goal of this proposal is to expand the HIBP energy range [80 - 200 keV] to explore the whole TJ-II poloidal cross-section.
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== Description of required resources ==
== Description of required resources ==
Required resources:
 
* Number of plasma discharges or days of operation:  
Required resources:  
* Essential diagnostic systems:
 
* Type of plasmas (heating configuration):
• Number of days of operation: 2
* Specific requirements on wall conditioning if any:
* External users: need a local computer account for data access: yes/no
• Essential diagnostic systems: Dual HIBP [May / June]
* Any external equipment to be integrated? Provide description and integration needs:
• Type of plasmas (heating configuration): ECRH & NBI
 
• Wall conditioning: Sufficient density control for good reproducibility in NBI plasmas.


== Preferred dates and degree of flexibility ==
== Preferred dates and degree of flexibility ==
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[[Category:TJ-II internal documents]]
[[Category:TJ-II internal documents]]
[[Category:TJ-II experimental proposals 2021]]
[[Category:TJ-II experimental proposals Spring 2021]]
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