Effect of the potential of confined plasma on end-loss Ion in GAMMA 10/PDX

Seowon Jang, Makoto Ichimura, Mafumi Hirata, Ryuya Ikezoe, Mizuki Sakamoto, Shuhei Sumida, Koki Izumi, Atsuto Tanaka, Yushi Kubota, Ryo Sekine, Hiroki Kayano, Yousuke Nakashima

Research output: Contribution to journalArticle

Abstract

In the GAMMA 10/PDX tandem mirror, studies on divertor physics have been performed in the west end region by utilizing end-loss plasmas flowing from the confinement region. Since the plasma density in the end region is quite low (~ 1016 m-3), an increase of the end-loss ion flux is required. The increase of the end-loss ion flux has been obtained by increasing the density in the confinement region on previous experiments. When an additional ICRF heating using the antennas in the anchor cells has been performed, a significant increase of the ion flux has been observed with the increase of the potential in the central cell although the change of line densities in the confinement region is little. The effect of the potential on the ion flux has been examined on the GAMMA 10/PDX using about 10,000 discharges. The ion flux increases almost linearly with the potential and the density increase. By comparing with a simple calculation, the increase of the ion flux is explained by the expansion of loss cone boundary of ions and the decrease of the transport time of the end-loss ions from the confinement region to the end region.

Original languageEnglish
Article number2402032
JournalPlasma and Fusion Research
Volume14
Issue numberSpecialissue1
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

ions
plasma loss
tandem mirrors
cells
plasma density
cones
antennas
physics
heating
expansion

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Jang, S., Ichimura, M., Hirata, M., Ikezoe, R., Sakamoto, M., Sumida, S., ... Nakashima, Y. (2019). Effect of the potential of confined plasma on end-loss Ion in GAMMA 10/PDX. Plasma and Fusion Research, 14(Specialissue1), [2402032]. https://doi.org/10.1585/pfr.14.2402032

Effect of the potential of confined plasma on end-loss Ion in GAMMA 10/PDX. / Jang, Seowon; Ichimura, Makoto; Hirata, Mafumi; Ikezoe, Ryuya; Sakamoto, Mizuki; Sumida, Shuhei; Izumi, Koki; Tanaka, Atsuto; Kubota, Yushi; Sekine, Ryo; Kayano, Hiroki; Nakashima, Yousuke.

In: Plasma and Fusion Research, Vol. 14, No. Specialissue1, 2402032, 01.01.2019.

Research output: Contribution to journalArticle

Jang, S, Ichimura, M, Hirata, M, Ikezoe, R, Sakamoto, M, Sumida, S, Izumi, K, Tanaka, A, Kubota, Y, Sekine, R, Kayano, H & Nakashima, Y 2019, 'Effect of the potential of confined plasma on end-loss Ion in GAMMA 10/PDX', Plasma and Fusion Research, vol. 14, no. Specialissue1, 2402032. https://doi.org/10.1585/pfr.14.2402032
Jang S, Ichimura M, Hirata M, Ikezoe R, Sakamoto M, Sumida S et al. Effect of the potential of confined plasma on end-loss Ion in GAMMA 10/PDX. Plasma and Fusion Research. 2019 Jan 1;14(Specialissue1). 2402032. https://doi.org/10.1585/pfr.14.2402032
Jang, Seowon ; Ichimura, Makoto ; Hirata, Mafumi ; Ikezoe, Ryuya ; Sakamoto, Mizuki ; Sumida, Shuhei ; Izumi, Koki ; Tanaka, Atsuto ; Kubota, Yushi ; Sekine, Ryo ; Kayano, Hiroki ; Nakashima, Yousuke. / Effect of the potential of confined plasma on end-loss Ion in GAMMA 10/PDX. In: Plasma and Fusion Research. 2019 ; Vol. 14, No. Specialissue1.
@article{df109ef27cef42b9a051c208da45819b,
title = "Effect of the potential of confined plasma on end-loss Ion in GAMMA 10/PDX",
abstract = "In the GAMMA 10/PDX tandem mirror, studies on divertor physics have been performed in the west end region by utilizing end-loss plasmas flowing from the confinement region. Since the plasma density in the end region is quite low (~ 1016 m-3), an increase of the end-loss ion flux is required. The increase of the end-loss ion flux has been obtained by increasing the density in the confinement region on previous experiments. When an additional ICRF heating using the antennas in the anchor cells has been performed, a significant increase of the ion flux has been observed with the increase of the potential in the central cell although the change of line densities in the confinement region is little. The effect of the potential on the ion flux has been examined on the GAMMA 10/PDX using about 10,000 discharges. The ion flux increases almost linearly with the potential and the density increase. By comparing with a simple calculation, the increase of the ion flux is explained by the expansion of loss cone boundary of ions and the decrease of the transport time of the end-loss ions from the confinement region to the end region.",
author = "Seowon Jang and Makoto Ichimura and Mafumi Hirata and Ryuya Ikezoe and Mizuki Sakamoto and Shuhei Sumida and Koki Izumi and Atsuto Tanaka and Yushi Kubota and Ryo Sekine and Hiroki Kayano and Yousuke Nakashima",
year = "2019",
month = "1",
day = "1",
doi = "10.1585/pfr.14.2402032",
language = "English",
volume = "14",
journal = "Plasma and Fusion Research",
issn = "1880-6821",
publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",
number = "Specialissue1",

}

TY - JOUR

T1 - Effect of the potential of confined plasma on end-loss Ion in GAMMA 10/PDX

AU - Jang, Seowon

AU - Ichimura, Makoto

AU - Hirata, Mafumi

AU - Ikezoe, Ryuya

AU - Sakamoto, Mizuki

AU - Sumida, Shuhei

AU - Izumi, Koki

AU - Tanaka, Atsuto

AU - Kubota, Yushi

AU - Sekine, Ryo

AU - Kayano, Hiroki

AU - Nakashima, Yousuke

PY - 2019/1/1

Y1 - 2019/1/1

N2 - In the GAMMA 10/PDX tandem mirror, studies on divertor physics have been performed in the west end region by utilizing end-loss plasmas flowing from the confinement region. Since the plasma density in the end region is quite low (~ 1016 m-3), an increase of the end-loss ion flux is required. The increase of the end-loss ion flux has been obtained by increasing the density in the confinement region on previous experiments. When an additional ICRF heating using the antennas in the anchor cells has been performed, a significant increase of the ion flux has been observed with the increase of the potential in the central cell although the change of line densities in the confinement region is little. The effect of the potential on the ion flux has been examined on the GAMMA 10/PDX using about 10,000 discharges. The ion flux increases almost linearly with the potential and the density increase. By comparing with a simple calculation, the increase of the ion flux is explained by the expansion of loss cone boundary of ions and the decrease of the transport time of the end-loss ions from the confinement region to the end region.

AB - In the GAMMA 10/PDX tandem mirror, studies on divertor physics have been performed in the west end region by utilizing end-loss plasmas flowing from the confinement region. Since the plasma density in the end region is quite low (~ 1016 m-3), an increase of the end-loss ion flux is required. The increase of the end-loss ion flux has been obtained by increasing the density in the confinement region on previous experiments. When an additional ICRF heating using the antennas in the anchor cells has been performed, a significant increase of the ion flux has been observed with the increase of the potential in the central cell although the change of line densities in the confinement region is little. The effect of the potential on the ion flux has been examined on the GAMMA 10/PDX using about 10,000 discharges. The ion flux increases almost linearly with the potential and the density increase. By comparing with a simple calculation, the increase of the ion flux is explained by the expansion of loss cone boundary of ions and the decrease of the transport time of the end-loss ions from the confinement region to the end region.

UR - http://www.scopus.com/inward/record.url?scp=85063629234&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063629234&partnerID=8YFLogxK

U2 - 10.1585/pfr.14.2402032

DO - 10.1585/pfr.14.2402032

M3 - Article

AN - SCOPUS:85063629234

VL - 14

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

SN - 1880-6821

IS - Specialissue1

M1 - 2402032

ER -