TJ-II: Determination of the spatial periodicity of NBI-driven Alfvén Eigenmodes and study of its magnetic configuration dependence: Difference between revisions
| Line 15: | Line 15: | ||
== Description of the activity == | == Description of the activity == | ||
MHD activity produced by Alfvén Eigenmodes (AEs) is routinely observed in NBI-heated TJ-II plasmas <ref>A. Cappa et al, Nuclear Fusion, 61(6):066019 (2021), and references therein</ref>. The results provided by recently installed sets of helical magnetic coils complement the previous experimental data and, together with advanced analysis tools like the 3D Lomb periodogram <ref>S. Zegenhagen, et al., Plasma Physics and Controlled Fusion, 48(9):1333–1346 (2006)</ref> allows the determination of the AEs spatial periodicity with an accuracy non reachable so far. | MHD activity produced by Alfvén Eigenmodes (AEs) is routinely observed in NBI-heated TJ-II plasmas <ref>A. Cappa et al, Nuclear Fusion, 61(6):066019 (2021), and references therein</ref>. The results provided by recently installed sets of helical magnetic coils complement the previous experimental data and, together with advanced analysis tools like the 3D Lomb periodogram <ref>S. Zegenhagen, et al., Plasma Physics and Controlled Fusion, 48(9):1333–1346 (2006)</ref> allows the determination of the AEs spatial periodicity with an accuracy non reachable so far. | ||
With this goal in mind we propose to study the alfvénic activity produced by both co and counter NBI injectors separately, as well as the one produced by simultaneous, balanced heating with both injectors (compensated plasma current). We plan to perform this study in at least two magnetic configurations, 100_44_64 (edge_iota 1.65) and 100_60_68 (1.77), looking for the expected influence of the configuration on the shear Alfvén spectrum. | |||
== International or National funding project or entity == | == International or National funding project or entity == | ||
Revision as of 17:10, 18 January 2022
Experimental campaign
Spring 2022
Proposal title
Determination of the spatial periodicity of NBI-driven Alfvén Eigenmodes and study of its magnetic configuration dependence.
Name and affiliation of proponent
Álvaro Cappa, CIEMAT. Pedro Pons, CIEMAT. Macarena Liniers, CIEMAT. Enrique Ascasíbar, CIEMAT.
Details of contact person at LNF
Enrique Ascasíbar, CIEMAT.
Description of the activity
MHD activity produced by Alfvén Eigenmodes (AEs) is routinely observed in NBI-heated TJ-II plasmas [1]. The results provided by recently installed sets of helical magnetic coils complement the previous experimental data and, together with advanced analysis tools like the 3D Lomb periodogram [2] allows the determination of the AEs spatial periodicity with an accuracy non reachable so far.
With this goal in mind we propose to study the alfvénic activity produced by both co and counter NBI injectors separately, as well as the one produced by simultaneous, balanced heating with both injectors (compensated plasma current). We plan to perform this study in at least two magnetic configurations, 100_44_64 (edge_iota 1.65) and 100_60_68 (1.77), looking for the expected influence of the configuration on the shear Alfvén spectrum.
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:
- Essential diagnostic systems:
- Type of plasmas (heating configuration):
- 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)