A superconductive transition edge sensor (TES) calorimeter is for the first time applied for the diagnostics of the reversed field pinch plasma produced in the toroidal pinch experiment RX (TPE-RX), and the instrumental system is fully described. The first result from the soft x-ray spectroscopy in with an energy resolution are also presented. The TES calorimeter is made of a thin bilayer film of titanium and gold with a transition temperature of and its best energy resolution at our laboratory is , while it was significantly degraded by about a factor of eight during the plasma operation. The TES microcalorimeter was installed in a portable adiabatic demagnetization refrigerator (ADR), which is originally designed for a rocket experiment. The detector box is carefully designed to shield the strong magnetic field produced by the ADR and TPE-RX. The ADR was directly connected to TPE-RX with a vacuum duct in the sideway configuration, and cooled down to stabilized with an accuracy of rms using an improved proportional, integral, and derivative (PID) control method. Thin aluminized Toray Lumirror or Parylene-N films were used for the IR to UV blocking filters of the incident x-ray window to allow soft x-rays coming into the detector with good efficiency. TPE-RX was operated with the plasma current of , and the wave forms of the TES output for every plasma shot lasting were obtained with a digital oscilloscope. The wave forms were analyzed with the optimal filtering method, and x-ray signals were extracted. A total of 3472 counts of x-ray signals were detected for 210 plasma shots during the flat-top phase of . Combined with the data measured with a lithium drifted silicon detector in the range, spectral features are investigated using a spectral fitting package XSPEC. The obtained spectrum is well explained by thermal plasma emission, although an impurity iron-L line emissions at variously ionized states are dominant around . At least three different temperature components ranging are required to account for the spectral shape, while the average temperature is consistent with the ruby laser Thomson scattering measurement.
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April 2006
Research Article|
April 12 2006
Soft x-ray measurement of the toroidal pinch experiment RX reversed field pinch plasma using transition edge sensor calorimeter
Keisuke Shinozaki;
Keisuke Shinozaki
a)
Department of Physics,
Tokyo Metropolitan University (TMU)
, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Akio Hoshino;
Akio Hoshino
Department of Physics,
Tokyo Metropolitan University (TMU)
, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Yoshitaka Ishisaki;
Yoshitaka Ishisaki
Department of Physics,
Tokyo Metropolitan University (TMU)
, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Umeyo Morita;
Umeyo Morita
Department of Physics,
Tokyo Metropolitan University (TMU)
, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Takaya Ohashi;
Takaya Ohashi
Department of Physics,
Tokyo Metropolitan University (TMU)
, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Tatehiro Mihara;
Tatehiro Mihara
Cosmic Radiation, The Institute of Physical and Chemical Research
, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Kazuhisa Mitsuda;
Kazuhisa Mitsuda
Institute of Space and Astronautical Science
, Japan Aerospace Exploration Agency (ISAS/JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
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Keiichi Tanaka;
Keiichi Tanaka
SII Nano-Technology Inc. (SIINT)
, 563 Takatsuka-Shinden, Matsudo, Chiba 270-2222, Japan
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Yasuyuki Yagi;
Yasuyuki Yagi
National Institute of Advanced Industrial Science and Technology (AIST)
, 1-1-1 Tsukuba, Ibaraki 305-8568, Japan
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Haruhisa Koguchi;
Haruhisa Koguchi
National Institute of Advanced Industrial Science and Technology (AIST)
, 1-1-1 Tsukuba, Ibaraki 305-8568, Japan
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Yoichi Hirano;
Yoichi Hirano
National Institute of Advanced Industrial Science and Technology (AIST)
, 1-1-1 Tsukuba, Ibaraki 305-8568, Japan
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Hajime Sakakita
Hajime Sakakita
National Institute of Advanced Industrial Science and Technology (AIST)
, 1-1-1 Tsukuba, Ibaraki 305-8568, Japan
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a)
Electronic mail: [email protected]
Rev. Sci. Instrum. 77, 043104 (2006)
Article history
Received:
May 10 2005
Accepted:
January 12 2006
Citation
Keisuke Shinozaki, Akio Hoshino, Yoshitaka Ishisaki, Umeyo Morita, Takaya Ohashi, Tatehiro Mihara, Kazuhisa Mitsuda, Keiichi Tanaka, Yasuyuki Yagi, Haruhisa Koguchi, Yoichi Hirano, Hajime Sakakita; Soft x-ray measurement of the toroidal pinch experiment RX reversed field pinch plasma using transition edge sensor calorimeter. Rev. Sci. Instrum. 1 April 2006; 77 (4): 043104. https://doi.org/10.1063/1.2173029
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