TY - JOUR
T1 - Conceptual design of heavy ion beam probes on the PLATO tokamak
AU - Ido, T.
AU - Fujisawa, A.
AU - Takemura, K.
AU - Kobayashi, T. K.
AU - Nishimura, D.
AU - Kasuya, N.
AU - Fukuyama, A.
AU - Moon, C.
AU - Yamasaki, K.
AU - Inagaki, S.
AU - Nagashima, Y.
AU - Yamada, T.
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Nos. JP17H06089 and JP18K03589. The authors appreciate Professor K. Itoh of Chubu University for the encouragement and Dr. A. Shimizu of NIFS for valuable discussion.
Publisher Copyright:
© 2021 Author(s).
PY - 2021/5/1
Y1 - 2021/5/1
N2 - Heavy ion beam probe (HIBP) systems have been designed for the new tokamak, PLATO [A. Fujisawa, AIP Conf. Proc. 1993, 020011 (2018)]. The designs have been completed, and the installations are in progress. Two HIBPs are being installed in toroidal sections 180° apart to investigate long-range correlations in the toroidal direction. Each HIBP consists of an injection beamline and a detection beamline as usual. Yet, one of the HIBPs is equipped with an additional detection beamline; the measurement positions of its two detection beamlines can be placed on almost the same magnetic surface yet at poloidal angles that differ by ∼180°. The use of three detection beamlines allows us to investigate spatial asymmetry and long-range correlations in both the toroidal and poloidal directions, simultaneously. The detected beam intensity is expected to be enough for turbulence measurements in almost the entire plasma region when the electron density is up to 1 × 1019 m-3 by selecting appropriate ion species for the probe beam. Each detector has three channels 10 mm apart, allowing measurement of local structures of micro-scale turbulence. Therefore, using the HIBPs on the PLATO tokamak will enable both local and global properties of plasma turbulence to be investigated, simultaneously.
AB - Heavy ion beam probe (HIBP) systems have been designed for the new tokamak, PLATO [A. Fujisawa, AIP Conf. Proc. 1993, 020011 (2018)]. The designs have been completed, and the installations are in progress. Two HIBPs are being installed in toroidal sections 180° apart to investigate long-range correlations in the toroidal direction. Each HIBP consists of an injection beamline and a detection beamline as usual. Yet, one of the HIBPs is equipped with an additional detection beamline; the measurement positions of its two detection beamlines can be placed on almost the same magnetic surface yet at poloidal angles that differ by ∼180°. The use of three detection beamlines allows us to investigate spatial asymmetry and long-range correlations in both the toroidal and poloidal directions, simultaneously. The detected beam intensity is expected to be enough for turbulence measurements in almost the entire plasma region when the electron density is up to 1 × 1019 m-3 by selecting appropriate ion species for the probe beam. Each detector has three channels 10 mm apart, allowing measurement of local structures of micro-scale turbulence. Therefore, using the HIBPs on the PLATO tokamak will enable both local and global properties of plasma turbulence to be investigated, simultaneously.
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U2 - 10.1063/5.0041814
DO - 10.1063/5.0041814
M3 - Article
C2 - 34243249
AN - SCOPUS:85106866957
SN - 0034-6748
VL - 92
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 5
M1 - 053553
ER -