TY - JOUR
T1 - Current profile reconstruction using electron temperature imaging diagnostics
AU - Tritz, K.
AU - Stutman, D.
AU - Delgado-Aparicio, L. F.
AU - Finkenthal, M.
AU - Pacella, D.
AU - Kaita, R.
AU - Stratton, B.
AU - Sabbagh, S.
PY - 2004/10
Y1 - 2004/10
N2 - Flux surface shape information can be used to constrain the current profile for reconstruction of the plasma equilibrium. One method of inferring flux surface shape relies on plasma x-ray emission; however, deviations from the flux surfaces due to impurity and density asymmetries complicate the interpretation. Electron isotherm surfaces should correspond well to the plasma flux surfaces, and equilibrium constraint modeling using this isotherm information constrains the current profile. The KFIT code is used to assess the profile uncertainty and to optimize the number, location and SNR required for the Te detectors. As Te imaging detectors we consider tangentially viewing, vertically spaced, linear gas electron multiplier arrays operated in pulse height analysis (PHA) mode and multifoil soft x-ray arrays. Isoflux coordinate sets provided by T e measurements offer a strong constraint on the equilibrium reconstruction in both a stacked horizontal array configuration and a crossed horizontal and vertical beam system with q 0 determined to within ±4%. The required SNR can be provided with either PHA or multicolor diagnostic techniques, though the multicolor system requires. ∼ × 4 better statistics for comparable final errors.
AB - Flux surface shape information can be used to constrain the current profile for reconstruction of the plasma equilibrium. One method of inferring flux surface shape relies on plasma x-ray emission; however, deviations from the flux surfaces due to impurity and density asymmetries complicate the interpretation. Electron isotherm surfaces should correspond well to the plasma flux surfaces, and equilibrium constraint modeling using this isotherm information constrains the current profile. The KFIT code is used to assess the profile uncertainty and to optimize the number, location and SNR required for the Te detectors. As Te imaging detectors we consider tangentially viewing, vertically spaced, linear gas electron multiplier arrays operated in pulse height analysis (PHA) mode and multifoil soft x-ray arrays. Isoflux coordinate sets provided by T e measurements offer a strong constraint on the equilibrium reconstruction in both a stacked horizontal array configuration and a crossed horizontal and vertical beam system with q 0 determined to within ±4%. The required SNR can be provided with either PHA or multicolor diagnostic techniques, though the multicolor system requires. ∼ × 4 better statistics for comparable final errors.
UR - http://www.scopus.com/inward/record.url?scp=9944257630&partnerID=8YFLogxK
U2 - 10.1063/1.1790056
DO - 10.1063/1.1790056
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:9944257630
SN - 0034-6748
VL - 75
SP - 4033
EP - 4036
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 10 II
ER -