title: Novel energy resolving x-ray pinhole camera on Alcator C-Mod.
abstract: A new energy resolving x-ray pinhole camera has been recently installed on Alcator C-Mod. This diagnostic is capable of 1D or 2D imaging with a spatial resolution of ≈1 cm, an energy resolution of ≈1 keV in the range of 3.5-15 keV and a maximum time resolution of 5 ms. A novel use of a Pilatus 2 hybrid-pixel x-ray detector [P. Kraft et al., J. Synchrotron Rad. 16, 368 (2009)] is employed in which the lower energy threshold of individual pixels is adjusted, allowing regions of a single detector to be sensitive to different x-ray energy ranges. Development of this new detector calibration technique was done as a collaboration between PPPL and Dectris Ltd. The calibration procedure is described, and the energy resolution of the detector is characterized. Initial data from this installation on Alcator C-Mod is presented. This diagnostic provides line-integrated measurements of impurity emission which can be used to determine impurity concentrations as well as the electron energy distribution.
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: N A
authors.initials: NA
authors.lastname: Pablant
authors.forename: L
authors.initials: L
authors.lastname: Delgado-Aparicio
authors.forename: M
authors.initials: M
authors.lastname: Bitter
authors.forename: S
authors.initials: S
authors.lastname: Brandstetter
authors.forename: E
authors.initials: E
authors.lastname: Eikenberry
authors.forename: R
authors.initials: R
authors.lastname: Ellis
authors.forename: K W
authors.initials: KW
authors.lastname: Hill
authors.forename: P
authors.initials: P
authors.lastname: Hofer
authors.forename: M
authors.initials: M
authors.lastname: Schneebeli