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TJ-II: Pellet induced Enhanced Confinement: the role of Er and turbulence: Difference between revisions
TJ-II: Pellet induced Enhanced Confinement: the role of Er and turbulence (view source)
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However, the underlying physics that can induce this regime is still unclear in TJ-II. Taking into account that Er and turbulence seems to play a key role in similar phenomena observed in the W7-X (enhanced confinement after pellet injection)<ref>T. Estrada et al., Nucl. Fusion 61 (2021) 046008</ref>, we propose series of PIs into plasmas with controlled density and different NBI heating powers (from low power, with 1 NBI working, to high power, with both NBI working) in order to study simultaneously the evolution of plasma potential and Er profiles (HIBPs and DR) as well as of the plasma density and its fluctations (HIBPs and DR). | However, the underlying physics that can induce this regime is still unclear in TJ-II. Taking into account that Er and turbulence seems to play a key role in similar phenomena observed in the W7-X (enhanced confinement after pellet injection)<ref>T. Estrada et al., Nucl. Fusion 61 (2021) 046008</ref>, we propose series of PIs into plasmas with controlled density and different NBI heating powers (from low power, with 1 NBI working, to high power, with both NBI working) in order to study simultaneously the evolution of plasma potential and Er profiles (HIBPs and DR) as well as of the plasma density and its fluctations (HIBPs and DR). | ||
== International or National funding project or entity == | == International or National funding project or entity == | ||
Studies of fuelling and impurity control in the stellarators TJ-II and W7-X through the use of cryogenic and TESPEl pellets (Estudios de abastacimiento y control de impurezas en los stellarators mediante el uso de perdigones criogenicos y TESPEL", | |||
Ref: PID2020-116599RB-I00 | Ref: PID2020-116599RB-I00 | ||
== Description of required resources == | == Description of required resources == | ||
Required resources: | Required resources: | ||
* Number of plasma discharges or days of operation: | * Number of plasma discharges or days of operation: 2 days (scan in NBI power and magnetic configuration) | ||
* Essential diagnostic systems: TS, HIBP, Doppler Reflectometer, He-Beam | * Essential diagnostic systems: TS, HIBP, Doppler Reflectometer, He-Beam, Pellet injection | ||
* Type of plasmas (heating configuration): | * Type of plasmas (heating configuration): ECRH, NBI | ||
* Specific requirements on wall conditioning if any: | * Specific requirements on wall conditioning if any: Good control of NBI heated plasmas | ||
* External users: need a local computer account for data access: | * External users: need a local computer account for data access: no | ||
* Any external equipment to be integrated? | * Any external equipment to be integrated? No: | ||
== Preferred dates and degree of flexibility == | == Preferred dates and degree of flexibility == | ||
Preferred dates: | Preferred dates: 26-10-2021 to 30-11-2021 when HIBPs available | ||
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