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Observations of core ion cyclotron emission on ASDEX Upgrade tokamak
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Ochoukov, R., Bobkov, V., Chapman, Benjamin, Dendy, R. O., Dunne, M., Faugel, H., García-Muñoz, M., Geiger, B., Hennequin, P., McClements, K. G., Moseev, D., Nielsen, S., Rasmussen, J., Schneider, P., Weiland, M. and Noterdaeme, J.-M. (2018) Observations of core ion cyclotron emission on ASDEX Upgrade tokamak. Review of Scientific Instruments, 89 (10). 10J101. doi:10.1063/1.5035180 ISSN 0034-6748.
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Official URL: https://doi.org/10.1063/1.5035180
Abstract
The B-dot probe diagnostic suite on the ASDEX Upgrade tokamak has recently been upgraded with a new 125 MHz, 14 bit resolution digitizer to study ion cyclotron emission (ICE). While classic edge emission from the low field side plasma is often observed, we also measure waves originating from the core with fast fusion protons or beam injected deuterons being a possible emission driver. Comparing the measured frequency values with ion cyclotron harmonics present in the plasma places the origin of this emission on the magnetic axis, with the fundamental hydrogen/second deuterium cyclotron harmonic matching the observed values. The actual values range from ∼27 MHz at the on-axis toroidal field BT = −1.79 T to ∼40 MHz at BT = −2.62 T. When the magnetic axis position evolves during this emission, the measured frequency values track the changes in the estimated on-axis cyclotron frequency values. Core ICE is usually a transient event lasting ∼100 ms during the neutral beam startup phase. However, in some cases, core emission occurs in steady-state plasmas and lasts for longer than 1 s. These observations suggest an attractive possibility of using a non-perturbing ICE-based diagnostic to passively monitor fusion alpha particles at the location of their birth in the plasma core, in deuterium-tritium burning devices such as ITER and DEMO
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Library of Congress Subject Headings (LCSH): | Tokamaks, Cyclotrons | ||||||||
Journal or Publication Title: | Review of Scientific Instruments | ||||||||
Publisher: | American Institute of Physics | ||||||||
ISSN: | 0034-6748 | ||||||||
Official Date: | October 2018 | ||||||||
Dates: |
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Volume: | 89 | ||||||||
Number: | 10 | ||||||||
Article Number: | 10J101 | ||||||||
DOI: | 10.1063/1.5035180 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 18 July 2018 | ||||||||
Date of first compliant Open Access: | 18 July 2018 | ||||||||
RIOXX Funder/Project Grant: |
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