Alphysica Ltd.

Saint Petersburg, Russia

Alphysica Ltd.

Saint Petersburg, Russia
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Grigoriev S.,D.V. Efremov Scientific Research Institute of Eelectrophysical Apparatus | Tanchuk V.,D.V. Efremov Scientific Research Institute of Eelectrophysical Apparatus | Senik K.,D.V. Efremov Scientific Research Institute of Eelectrophysical Apparatus | Krasikov Y.,Jülich Research Center | And 4 more authors.
Fusion Engineering and Design | Year: 2015

The First Mirror (M1), as part of the ITER core CXRS diagnostics, is responsible for acquisition and transportation of the optical signal from the plasma to the corresponding spectrometer. The M1 is the most vulnerable component of this system working in severe conditions caused by its location in the direct view of the plasma. Based on the numerical analysis an optimized arrangement of baffles was found for the optical channel. It is shown that such measures like the deeper M1 positioning in the shielding, duct configuration and baffles implementation made it possible to reduce heat loads on the M1 by a factor of about 102-103. © 2015 Elsevier B.V.


Grigoriev S.,D.V. Efremov Scientific Research Institute of Eelectrophysical Apparatus | Voinchet R.,Jülich Research Center | Gornikel I.,Alphysica Ltd. | Krasikov Y.,Jülich Research Center | And 3 more authors.
Fusion Engineering and Design | Year: 2011

The first mirror (M1) as an important part of the CXRS diagnostic system is responsible for acquisition and transportation of the optical signal of required quality from the ITER plasma to detectors. At the same time, the M1 is the most vulnerable component of this system working in drastic and severe conditions caused by its location in the direct view of the plasma. To minimize impurities deposition and guarantee the required lifetime for M1 its temperature shall be maintained within the operational range of 350 ± 50 °C. The computation of M1 of the reference CXRS design demonstrates that, firstly, helium is the best candidate among the analyzed gases (He, N2, Ar) to be used as a coolant to maintain the M1 temperature in the required operational range of 350 ± 50 °C giving the highest heat transfer coefficient and the lowest hydraulic losses at moderate flow rates (vgas = 40-60 m/s) and, secondly, optimization of the cooling channels configuration together with an increase in the gas velocity and/or with heat transfer intensifiers makes it possible to provide the required M1 temperature conditions. © 2011 Elsevier B.V. All Rights Reserved.

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