TITLE

In situ spectral calibration method for the impurity influx monitor (divertor) for ITER using angled physical contact fibers

AUTHOR(S)
Iwamae, A.; Ogawa, H.; Sugie, T.; Kusama, Y.
PUB. DATE
March 2011
SOURCE
Review of Scientific Instruments;Mar2011, Vol. 82 Issue 3, p033502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The in situ calibration method for the impurity influx monitor (divertor) is experimentally examined. The total reflectance of the optical path from the focal point of the Cassegrain telescope to the first mirror is derived using a micro retroreflector array. An optical fiber with angled physical contact (APC) connectors reduces the return edge reflection. APC fibers and a multimode coupler increase the signal-to-noise ratio by about one order compared to that of triple-branched fibers and enable measurement of the wavelength dependence of the total reflectance of the optical system even after potential deterioration of mirror surfaces reduces reflectance.
ACCESSION #
59744555

 

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