TJ-II: Commissioning of new Gas Puff Imaging system

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Experimental campaign

2021

Proposal title

Commissioning of new Gas Puff Imaging (GPI) system

Name and affiliation of proponent

I. Voldiner,E. de la Cal, B. van Milligen and C. Hidalgo LNF, Ciemat

Details of contact person at LNF

I. Voldiner and E. de la Cal

Description of the activity

A new gas injection system is under construction and will be installed in TJ-II for the next campaign. It will be used for GPI with a camera system that allows 3 simultaneous filtered frames to apply the He I ratio technique. The objective is to get 2D measurements of the edge plasma electron density ne and temperature Te with spatial resolution of 3 mm and temporal resolution down to 10 microseconds so as to study plasma turbulence. The first step will be the commissioning of the puffing system in TJ-II plasmas and take first images to see that the mounting is correct and optimise the Helium puffing levels into the plasma. The second step will be to obtain first images of ne and Te images and compare it with previous measurements and other diagnostics such as Reflectometry and Thomson Scattering [1]. The third step will be to find the best settings to study plasma turbulence [2].

[1] E. de la Cal E., Guasp J. and TJ-II Team 2011 Plasma Phys. Control. Fusion 53 085006

[2] E. de la Cal and TJ-II TEAM, Nucl. Fusion 56 (2016) 106031


International or National funding project or entity

If applicable, enter funding here or write N/A

Description of required resources

Required resources:

  • Number of plasma discharges or days of operation: 4
  • Essential diagnostic systems: Thomson Scattering, Reflectometry
  • Type of plasmas (heating configuration): ECRH and NBI
  • Specific requirements on wall conditioning if any: He puffing
  • External users: need a local computer account for data access: yes/no
  • Any external equipment to be integrated? Provide description and integration needs:

Preferred dates and degree of flexibility

Preferred dates: (format dd-mm-yyyy)

References



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