TJ-II:Measurement of Te and ne of Blobs analyzing recycling helium emission in front of a poloidal limiter

Experimental campaign

2017 Spring

Proposal title

Measurement of Te and ne of Blobs analyzing recycling helium emission in front of a poloidal limiter

Name and affiliation of proponent

E. de la Cal

Details of contact person at LNF (if applicable)

Enter contact person here or N/A E. de la Cal

Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)

The electron density ne of Blobs has been measured with the Helium line ratio technique looking with a Fast camera system to helium to the gas from a puffing tube [1]. The comparison of the ne-turbulent structure and that of the emission brought us to the preliminary conclusion that the helium neutrals become also turbulent due to the coupling with the plasma fluctuations. In the present experiment we will try to repeat the measurements but looking to the helium neutrals recycling at a poloidal limiter.

[1] E. de la Cal and the TJ-II Team, Nuclear Fusion 56 (2016) 106031

If applicable, International or National funding project or entity

Plan Nacional "FZTEFA. Flujos zonales (ENE2015-68206-P)

Description of required resources

Required resources:

• Number of plasma discharges or days of operation: 2 days
• Essential diagnostic systems:
• Type of plasmas (heating configuration): Helium plasmas with NBI / ECH
• Specific requirements on wall conditioning if any:
• 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

[1] E. de la Cal and the TJ-II Team, Nuclear Fusion 56 (2016) 106031

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