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Development of a new magnetic mirror device at the Korea Advanced Institute of Science and Technology.

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Title: Development of a new magnetic mirror device at the Korea Advanced Institute of Science and Technology.
Authors: Oh, D.1 (AUTHOR), Choe, M.1 (AUTHOR), Baek, G.1 (AUTHOR), Kim, D.1 (AUTHOR), Jung, B. K.2 (AUTHOR), Chung, K. J.3 (AUTHOR), Kourakis, I.4 (AUTHOR), Sung, C.1 (AUTHOR) choongkisung@kaist.ac.kr
Source: Journal of Plasma Physics. Mar2024, Vol. 90 Issue 2, p1-19. 19p.
Subjects: Magnetic devices, Magnetic flux density, Plasma physics, Gas dynamics, Plasma torch
Abstract: A new magnetic mirror machine named KAIMIR (KAIST mirror) has been designed and constructed at the Korea Advanced Institute of Science and Technology (KAIST) to study mirror plasma physics and simulate the boundary regions of magnetic fusion plasmas such as in a tokamak. The purpose of this paper is to introduce the characteristics and initial experimental results of KAIMIR. The cylindrical vacuum chamber has a length of 2.48 m and a diameter of 0.5 m and consists of three sub-chambers, namely the source, centre and expander chambers. A magnetic mirror configuration is achieved by electromagnetic coils with a maximum magnetic field strength of 0.4 T at the mirror nozzles and 0.1 T at the centre. The source plasma is generated by a plasma washer gun installed in the source chamber with a pulse forming network system. The typical discharge time is ~12 ms with a ~6 ms (1–7 ms) steady period. Initial results show that the on-axis electron density at the centre is 1019–20 m−3 and the electron temperature is 4–7 eV. Two parameters were varied in this initial phase, the source power and the mirror ratio, which is the ratio of highest to lowest magnetic field strength in the mirror-confined region. We observed that the increase of the electron density was mitigated for a source power above 0.2 MW. It was also found that the electron density increases almost linearly with the mirror ratio. Accordingly, the stored electron energy was also linearly proportional to the mirror ratio, similar to the scaling of the gas dynamic trap. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Plasma Physics is the property of Cambridge University Press and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 177041284
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Development of a new magnetic mirror device at the Korea Advanced Institute of Science and Technology.
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  Data: <searchLink fieldCode="AR" term="%22Oh%2C+D%2E%22">Oh, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Choe%2C+M%2E%22">Choe, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Baek%2C+G%2E%22">Baek, G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+D%2E%22">Kim, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jung%2C+B%2E+K%2E%22">Jung, B. K.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chung%2C+K%2E+J%2E%22">Chung, K. J.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kourakis%2C+I%2E%22">Kourakis, I.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sung%2C+C%2E%22">Sung, C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> choongkisung@kaist.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Plasma+Physics%22">Journal of Plasma Physics</searchLink>. Mar2024, Vol. 90 Issue 2, p1-19. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetic+devices%22">Magnetic devices</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+flux+density%22">Magnetic flux density</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+physics%22">Plasma physics</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+dynamics%22">Gas dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+torch%22">Plasma torch</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A new magnetic mirror machine named KAIMIR (KAIST mirror) has been designed and constructed at the Korea Advanced Institute of Science and Technology (KAIST) to study mirror plasma physics and simulate the boundary regions of magnetic fusion plasmas such as in a tokamak. The purpose of this paper is to introduce the characteristics and initial experimental results of KAIMIR. The cylindrical vacuum chamber has a length of 2.48 m and a diameter of 0.5 m and consists of three sub-chambers, namely the source, centre and expander chambers. A magnetic mirror configuration is achieved by electromagnetic coils with a maximum magnetic field strength of 0.4 T at the mirror nozzles and 0.1 T at the centre. The source plasma is generated by a plasma washer gun installed in the source chamber with a pulse forming network system. The typical discharge time is ~12 ms with a ~6 ms (1–7 ms) steady period. Initial results show that the on-axis electron density at the centre is 1019–20 m−3 and the electron temperature is 4–7 eV. Two parameters were varied in this initial phase, the source power and the mirror ratio, which is the ratio of highest to lowest magnetic field strength in the mirror-confined region. We observed that the increase of the electron density was mitigated for a source power above 0.2 MW. It was also found that the electron density increases almost linearly with the mirror ratio. Accordingly, the stored electron energy was also linearly proportional to the mirror ratio, similar to the scaling of the gas dynamic trap. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Plasma Physics is the property of Cambridge University Press and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1017/S0022377824000242
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      – Code: eng
        Text: English
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        PageCount: 19
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    Subjects:
      – SubjectFull: Magnetic devices
        Type: general
      – SubjectFull: Magnetic flux density
        Type: general
      – SubjectFull: Plasma physics
        Type: general
      – SubjectFull: Gas dynamics
        Type: general
      – SubjectFull: Plasma torch
        Type: general
    Titles:
      – TitleFull: Development of a new magnetic mirror device at the Korea Advanced Institute of Science and Technology.
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            NameFull: Oh, D.
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            NameFull: Choe, M.
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            NameFull: Baek, G.
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            NameFull: Kim, D.
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            – D: 01
              M: 03
              Text: Mar2024
              Type: published
              Y: 2024
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