TJ-II: Measurements using Gas Puff Imaging system

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Experimental campaign

Spring 2022

Proposal title

TJ-II: Measurements using Gas Puff Imaging system

Name and affiliation of proponent

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

Details of contact person at LNF

I. Voldiner

Description of the activity

Rational: Ongoing development and refinement of a novel gas injection system is underway at TJ-II stellarator. 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. Incremental improvements in hardware and analysis prompt new tests in experimental environment.

Goals: Obtain simultaneous measurements of edge plasma density and temperature profiles using GPI and other diagnostics such as Reflectometry, Langmuir probes, Supersonic He-I spectroscopy and Thomson Scattering [1] to validate and determine the applicability range of the Collisional Radiative Model. Simultaneously limits of applicability and effects of the gas puffing on discharge parameters will be explored in higher variety of scenarios to further explore 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

Include funding here (grants, national plans)

Description of required resources

Required resources:

  • Number of plasma discharges or days of operation: 3 (1 day in March - ECRH, 2 days in April-June - NBI)
  • Essential diagnostic systems: GPI, Supersonic He-puffing, AM Reflectometry, TS, Langmuir probes
  • Type of plasmas (heating configuration): ECRH and NBI
  • Specific requirements on wall conditioning if any: good plasma wall condition is requiered in NBI due to additional gas 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)


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