Study of retro reflector array for the polarimeter-interferometer system on EAST Tokamak

T. Lan; S. X. Wang; H. Q. Liu; J. Liu; Y. X. Jie; Z. Y. Zou; W. M. Li; X. Gao; H. Qin

doi:10.1088/1748-0221/10/12/C12017

Study of retro reflector array for the polarimeter-interferometer system on EAST Tokamak

T. Lan
, S. X. Wang
, H. Q. Liu
, J. Liu
, Y. X. Jie
, Z. Y. Zou
, W. M. Li
, X. Gao
, H. Qin

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

In this paper, we experimentally verify the feasibility of replacing individual retro reflectors (RRs) with retro reflector array (RRA) in EAST POlarimeter/INTerferometer (POINT) system, by considering mode transformation and power wastage. Being exposed to plasma environment directly, RRs have risks of deformation, erosion and deposition. RRA is preferable because it can be installed within a smaller space and provide a gap of several centimeters for the shutter design. This protective structure can reduce the cost of device maintenance and bring down system errors. According to Helmholtz-Kirchhoff integral theorem, the optimized incident diameter for the RRA, constituted by seven hexagonal RR cells, is 40 mm in POINT system. The corresponding bench tests are carried out by measuring the propagation properties of reflected beams by plane RRA for perpendicular incidence and reflected beams by terrace RRA for oblique incidence. The experimental results illustrate that RRA can be satisfactorily applied in POINT system at the optimized incident diameter. In view of the energy wastage caused by plasma film coating, it is found that RRA has more advantages for diagnostics using shorter wavelengths, such as the case in ITER.

Original language	English (US)
Article number	C12017
Journal	Journal of Instrumentation
Volume	10
Issue number	12
DOIs	https://doi.org/10.1088/1748-0221/10/12/C12017
State	Published - Dec 16 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation
Mathematical Physics

Keywords

interferometry, spectroscopy and imaging
Nuclear instruments and methods for hot plasma diagnostics; Plasma diagnostics

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10.1088/1748-0221/10/12/C12017

Cite this

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title = "Study of retro reflector array for the polarimeter-interferometer system on EAST Tokamak",

abstract = "In this paper, we experimentally verify the feasibility of replacing individual retro reflectors (RRs) with retro reflector array (RRA) in EAST POlarimeter/INTerferometer (POINT) system, by considering mode transformation and power wastage. Being exposed to plasma environment directly, RRs have risks of deformation, erosion and deposition. RRA is preferable because it can be installed within a smaller space and provide a gap of several centimeters for the shutter design. This protective structure can reduce the cost of device maintenance and bring down system errors. According to Helmholtz-Kirchhoff integral theorem, the optimized incident diameter for the RRA, constituted by seven hexagonal RR cells, is 40 mm in POINT system. The corresponding bench tests are carried out by measuring the propagation properties of reflected beams by plane RRA for perpendicular incidence and reflected beams by terrace RRA for oblique incidence. The experimental results illustrate that RRA can be satisfactorily applied in POINT system at the optimized incident diameter. In view of the energy wastage caused by plasma film coating, it is found that RRA has more advantages for diagnostics using shorter wavelengths, such as the case in ITER.",

keywords = "interferometry, spectroscopy and imaging, Nuclear instruments and methods for hot plasma diagnostics; Plasma diagnostics",

author = "T. Lan and Wang, \{S. X.\} and Liu, \{H. Q.\} and J. Liu and Jie, \{Y. X.\} and Zou, \{Z. Y.\} and Li, \{W. M.\} and X. Gao and H. Qin",

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year = "2015",

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doi = "10.1088/1748-0221/10/12/C12017",

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T1 - Study of retro reflector array for the polarimeter-interferometer system on EAST Tokamak

AU - Lan, T.

AU - Wang, S. X.

AU - Liu, H. Q.

AU - Liu, J.

AU - Jie, Y. X.

AU - Zou, Z. Y.

AU - Li, W. M.

AU - Gao, X.

AU - Qin, H.

PY - 2015/12/16

Y1 - 2015/12/16

N2 - In this paper, we experimentally verify the feasibility of replacing individual retro reflectors (RRs) with retro reflector array (RRA) in EAST POlarimeter/INTerferometer (POINT) system, by considering mode transformation and power wastage. Being exposed to plasma environment directly, RRs have risks of deformation, erosion and deposition. RRA is preferable because it can be installed within a smaller space and provide a gap of several centimeters for the shutter design. This protective structure can reduce the cost of device maintenance and bring down system errors. According to Helmholtz-Kirchhoff integral theorem, the optimized incident diameter for the RRA, constituted by seven hexagonal RR cells, is 40 mm in POINT system. The corresponding bench tests are carried out by measuring the propagation properties of reflected beams by plane RRA for perpendicular incidence and reflected beams by terrace RRA for oblique incidence. The experimental results illustrate that RRA can be satisfactorily applied in POINT system at the optimized incident diameter. In view of the energy wastage caused by plasma film coating, it is found that RRA has more advantages for diagnostics using shorter wavelengths, such as the case in ITER.

AB - In this paper, we experimentally verify the feasibility of replacing individual retro reflectors (RRs) with retro reflector array (RRA) in EAST POlarimeter/INTerferometer (POINT) system, by considering mode transformation and power wastage. Being exposed to plasma environment directly, RRs have risks of deformation, erosion and deposition. RRA is preferable because it can be installed within a smaller space and provide a gap of several centimeters for the shutter design. This protective structure can reduce the cost of device maintenance and bring down system errors. According to Helmholtz-Kirchhoff integral theorem, the optimized incident diameter for the RRA, constituted by seven hexagonal RR cells, is 40 mm in POINT system. The corresponding bench tests are carried out by measuring the propagation properties of reflected beams by plane RRA for perpendicular incidence and reflected beams by terrace RRA for oblique incidence. The experimental results illustrate that RRA can be satisfactorily applied in POINT system at the optimized incident diameter. In view of the energy wastage caused by plasma film coating, it is found that RRA has more advantages for diagnostics using shorter wavelengths, such as the case in ITER.

KW - interferometry, spectroscopy and imaging

KW - Nuclear instruments and methods for hot plasma diagnostics; Plasma diagnostics

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ER -

Study of retro reflector array for the polarimeter-interferometer system on EAST Tokamak

Abstract

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