TJ-II: Evolution of LCR by HIBP and Probes
Experimental campaign
Autumn 2021
Proposal title
Evolution of the core LRC, measured by Dual HIBP and of the edge LRC, measured by probes after Pellet Injection in ECRH and NBI
Name and affiliation of proponent
A. Melnikov, I. García-Cortés, K. McCarthy, M.A. Ochando, Nerea Panadero, Macarena Liniers and HIBP group
National Research Centre ‘Kurchatov Institute’, Moscow, Russian Federation
National Research Nuclear University ‘MEPhI’, Moscow, Russian Federation
Institute of Plasma Physics, NSC KIPT Kharkov, Ukraine
Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain
Details of contact person at LNF
Description of the activity
It is believed that the anomalous transport in toroidal devices (tokamaks and stellarators) has a turbulent nature. Turbulence has a very complicated structure, containing the self-regulating mechanism - Zonal Flow (ZF) - poloidally and toroidally symmetric plasma structures intertwinned with dynamic of turbulent eddies [1]. Manifestation of the ZF is the Long-range correlations (LRC), observed in both plasma edge by dual probes [2] and plasma core by Dual HIBP [3]. Perturbation of the plasma density and temperature profiles after Pellet Injection (PI) in ECRH and NBI plasmas, specifically during PIEC (NBI) will allow us to follow the evolution of the plasma turbulence, LRC and plasma potential in the transient regimes from normal to enhanced confinement and back. Such simultaneous measurements has a strong potential to shed a new light to the physical mechanism of the turbulent transport reduction in case of PIEC (NBI) compared to density evolution without confinement enhancement (PI in ECRH).
International or National funding project or entity
Cryogenic and impurity pellet studies in the stellarators TJ-II and W7-X Ref: PID2020-116599RB-I00
Description of required resources
Required resources:
- Number of plasma discharges or days of operation: 2 days
- Essential diagnostic systems: HIBP, Langmuir Probes
- Type of plasmas (heating configuration): ECRH and NBI
- 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)