Absolute calibration of sniffer probes on Wendelstein 7-X

被引：10

作者：

Moseev, D. ^{[1
]}

Laqua, H. P. ^{[1
]}

Marsen, S. ^{[1
]}

Stange, T. ^{[1
]}

Braune, H. ^{[1
]}

Erckmann, V. ^{[1
]}

Gellert, F. ^{[1
,2
]}

Oosterbeek, J. W. ^{[3
]}

机构：

[1] Max Planck Inst Plasma Phys, Greifswald, Germany

[2] Ernst Moritz Arndt Univ Greifswald, Greifswald, Germany

[3] Eindhoven Univ Technol, Eindhoven, Netherlands

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2016年 / 87卷 / 08期

关键词：

Stray light - Calibration;

D O I：

10.1063/1.4960349

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Here we report the first measurements of the power levels of stray radiation in the vacuum vessel of Wendelstein 7-X using absolutely calibrated sniffer probes. The absolute calibration is achieved by using calibrated sources of stray radiation and the implicit measurement of the quality factor of the Wendelstein 7-X empty vacuum vessel. Normalized absolute calibration coefficients agree with the cross-calibration coefficients that are obtained by the direct measurements, indicating that the measured absolute calibration coefficients and stray radiation levels in the vessel are valid. Close to the launcher, the stray radiation in the empty vessel reaches power levels up to 340 kW/m(2) per MW injected beam power. Furthest away from the launcher, i.e., half a toroidal turn, still 90 kW/m(2) per MW injected beam power is measured.

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