TY - JOUR
T1 - High throughput measurements of soft x-ray impurity emission using a multilayer mirror telescope
AU - Stutman, D.
AU - Tritz, K.
AU - Delgado-Aparicio, L.
AU - Finkenthal, M.
AU - Suliman, G.
AU - Roquemore, L.
AU - Kaita, R.
AU - Kugel, H.
AU - Johnson, D.
AU - Tamura, N.
AU - Sato, K.
AU - Sudo, S.
AU - Tarrio, C.
PY - 2006
Y1 - 2006
N2 - A 4 in. multilayer mirror telescope has been tested on National Spherical Torus Experiment (NSTX) for high throughput measurements of the beam excited soft x-ray impurity emission. The design is aimed at imaging low- k turbulent fluctuations in the plasma core. The test device used curved and planar MoSi mirrors to focus with ≈15% optical transmission and few angstrom bandwidths, the 135 Å Lyα line from injected Li III atoms, or the n=2-4 line from intrinsic C VI ions. As test detectors we used 1 cm2 absolute extreme ultraviolet diodes, equipped with 400 kHz bandwidth, low noise preamplifiers. With the available view on NSTX the telescope successfully detected small impurity density fluctuations associated with 11 modes rotating at midradius, indicating that a high signal to noise ratio and cost effective core turbulence diagnostic is feasible based on this concept.
AB - A 4 in. multilayer mirror telescope has been tested on National Spherical Torus Experiment (NSTX) for high throughput measurements of the beam excited soft x-ray impurity emission. The design is aimed at imaging low- k turbulent fluctuations in the plasma core. The test device used curved and planar MoSi mirrors to focus with ≈15% optical transmission and few angstrom bandwidths, the 135 Å Lyα line from injected Li III atoms, or the n=2-4 line from intrinsic C VI ions. As test detectors we used 1 cm2 absolute extreme ultraviolet diodes, equipped with 400 kHz bandwidth, low noise preamplifiers. With the available view on NSTX the telescope successfully detected small impurity density fluctuations associated with 11 modes rotating at midradius, indicating that a high signal to noise ratio and cost effective core turbulence diagnostic is feasible based on this concept.
UR - http://www.scopus.com/inward/record.url?scp=33750519060&partnerID=8YFLogxK
U2 - 10.1063/1.2227436
DO - 10.1063/1.2227436
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AN - SCOPUS:33750519060
SN - 0034-6748
VL - 77
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 10
M1 - 10F330
ER -
