Multilayer mirror and foil filter AXUV diode arrays on CDX-U spherical torus

V. A. Soukhanovskii; D. Stutman; M. Iovea; M. Finkenthal; H. W. Moos; T. Munsat; B. Jones; D. Hoffman; R. Kaita; R. Majeski

doi:10.1063/1.1323254

Multilayer mirror and foil filter AXUV diode arrays on CDX-U spherical torus

V. A. Soukhanovskii, D. Stutman, M. Iovea, M. Finkenthal, H. W. Moos, T. Munsat, B. Jones, D. Hoffman, R. Kaita, R. Majeski

PPPL Tokamak Expermntl Science

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12 Scopus citations

Abstract

Recent upgrades to CDX-U spherical torus diagnostics include two 10-channel AXUV diode arrays. The multilayer mirror (MLM) array measures the λ 150 O VI brightness profile in the poloidal plane using the Mo/B₄C synthetic multilayer structures as dispersive elements. The foil filter array has a tangential view and is equipped with interchangeable clear aperture, beryllium and titanium filters. This allows measurements of radiated power, O VI or C V radial distributions, respectively. The O VI and C V emissivity and the radiated power profiles are highly peaked. A Neoclassical impurity accumulation mechanism is considered as an explanation. For radiated power measurements in the T_e ≤ 100 eV plasmas, photon energy dependent corrections must be used in order to account for nonlinear AXUV sensitivity in the range E_phot≤20 eV. The arrays are also used for characterization of resistive MHD phenomena, such as the low m modes, saw-tooth oscillations and internal reconnection events. Based on the successful operation of the diagnostics, a new ultra soft x-ray multilayer mirror diode AXUV diode array monitoring the 34 Å emissivity distribution of C VI will be built and installed on the National Spherical Torus Experiment.

Original language	English (US)
Pages (from-to)	737-741
Number of pages	5
Journal	Review of Scientific Instruments
Volume	72
Issue number	1 II
DOIs	https://doi.org/10.1063/1.1323254
State	Published - Jan 2001

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.1323254

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@article{eef9e01d057546429802f528e438f2e5,

title = "Multilayer mirror and foil filter AXUV diode arrays on CDX-U spherical torus",

abstract = "Recent upgrades to CDX-U spherical torus diagnostics include two 10-channel AXUV diode arrays. The multilayer mirror (MLM) array measures the λ 150 O VI brightness profile in the poloidal plane using the Mo/B4C synthetic multilayer structures as dispersive elements. The foil filter array has a tangential view and is equipped with interchangeable clear aperture, beryllium and titanium filters. This allows measurements of radiated power, O VI or C V radial distributions, respectively. The O VI and C V emissivity and the radiated power profiles are highly peaked. A Neoclassical impurity accumulation mechanism is considered as an explanation. For radiated power measurements in the Te ≤ 100 eV plasmas, photon energy dependent corrections must be used in order to account for nonlinear AXUV sensitivity in the range Ephot≤20 eV. The arrays are also used for characterization of resistive MHD phenomena, such as the low m modes, saw-tooth oscillations and internal reconnection events. Based on the successful operation of the diagnostics, a new ultra soft x-ray multilayer mirror diode AXUV diode array monitoring the 34 {\AA} emissivity distribution of C VI will be built and installed on the National Spherical Torus Experiment.",

author = "Soukhanovskii, \{V. A.\} and D. Stutman and M. Iovea and M. Finkenthal and Moos, \{H. W.\} and T. Munsat and B. Jones and D. Hoffman and R. Kaita and R. Majeski",

year = "2001",

month = jan,

doi = "10.1063/1.1323254",

language = "English (US)",

volume = "72",

pages = "737--741",

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issn = "0034-6748",

publisher = "American Institute of Physics",

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T1 - Multilayer mirror and foil filter AXUV diode arrays on CDX-U spherical torus

AU - Soukhanovskii, V. A.

AU - Stutman, D.

AU - Iovea, M.

AU - Finkenthal, M.

AU - Moos, H. W.

AU - Munsat, T.

AU - Jones, B.

AU - Hoffman, D.

AU - Kaita, R.

AU - Majeski, R.

PY - 2001/1

Y1 - 2001/1

N2 - Recent upgrades to CDX-U spherical torus diagnostics include two 10-channel AXUV diode arrays. The multilayer mirror (MLM) array measures the λ 150 O VI brightness profile in the poloidal plane using the Mo/B4C synthetic multilayer structures as dispersive elements. The foil filter array has a tangential view and is equipped with interchangeable clear aperture, beryllium and titanium filters. This allows measurements of radiated power, O VI or C V radial distributions, respectively. The O VI and C V emissivity and the radiated power profiles are highly peaked. A Neoclassical impurity accumulation mechanism is considered as an explanation. For radiated power measurements in the Te ≤ 100 eV plasmas, photon energy dependent corrections must be used in order to account for nonlinear AXUV sensitivity in the range Ephot≤20 eV. The arrays are also used for characterization of resistive MHD phenomena, such as the low m modes, saw-tooth oscillations and internal reconnection events. Based on the successful operation of the diagnostics, a new ultra soft x-ray multilayer mirror diode AXUV diode array monitoring the 34 Å emissivity distribution of C VI will be built and installed on the National Spherical Torus Experiment.

AB - Recent upgrades to CDX-U spherical torus diagnostics include two 10-channel AXUV diode arrays. The multilayer mirror (MLM) array measures the λ 150 O VI brightness profile in the poloidal plane using the Mo/B4C synthetic multilayer structures as dispersive elements. The foil filter array has a tangential view and is equipped with interchangeable clear aperture, beryllium and titanium filters. This allows measurements of radiated power, O VI or C V radial distributions, respectively. The O VI and C V emissivity and the radiated power profiles are highly peaked. A Neoclassical impurity accumulation mechanism is considered as an explanation. For radiated power measurements in the Te ≤ 100 eV plasmas, photon energy dependent corrections must be used in order to account for nonlinear AXUV sensitivity in the range Ephot≤20 eV. The arrays are also used for characterization of resistive MHD phenomena, such as the low m modes, saw-tooth oscillations and internal reconnection events. Based on the successful operation of the diagnostics, a new ultra soft x-ray multilayer mirror diode AXUV diode array monitoring the 34 Å emissivity distribution of C VI will be built and installed on the National Spherical Torus Experiment.

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Multilayer mirror and foil filter AXUV diode arrays on CDX-U spherical torus

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