Dual crystal x-ray spectrometer at 1.8 keV for high repetition-rate single-photon counting spectroscopy experiments. (22nd August 2016)

• Record Type: Journal Article
• Authors: Gamboa, E.J.; Bachmann, B.; Kraus, D.; MacDonald, M.J.; Bucher, M.; Carron, S.; Coffee, R.N.; Drake, R.P.; Emig, J.; Ferguson, K.R.; Fletcher, L.B.; Glenzer, S.H.; Gorkhover, T.; Hau-Riege, S.P.; Krzywinski, J.; Levitan, A.L.; Meiwes-Broer, K.-H.; Osipov, T.; Pardini, T.; Peltz, C.; Skruszewicz, S.; Bostedt, C.; Fennel, T.; Döppner, T.
• Is Part Of: Journal of instrumentation. Volume 11:Number 8(2016:Aug.)
• Page Start: P08015
• Page End: P08015
• Publication Date: 2016-08-22
• Subjects: Nuclear instruments and methods for hot plasma diagnostics -- Plasma diagnostics - interferometry, spectroscopy and imaging -- Plasma generation (laser-produced, RF, x ray-produced); Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/11/08/P08015
• Languages: English
• ISSNs: 1748-0221

Abstract

Abstract: With the recent development of high-repetition rate x-ray free electron lasers (FEL), it is now possible to perform x-ray scattering and emission spectroscopy measurements from thin foils or gasses heated to high-energy density conditions by integrating over many experimental shots. Since the expected signal may be weaker than the typical CCD readout noise over the region-of-interest, it is critical to the success of this approach to use a detector with high-energy resolution so that single x-ray photons may be isolated. Here we describe a dual channel x-ray spectrometer developed for the Atomic and Molecular Optics endstation at the Linac Coherent Light Source (LCLS) for x-ray spectroscopy near the K-edge of aluminum. The spectrometer is based on a pair of curved PET (002) crystals coupled to a single pnCCD detector which simultaneously measures x-ray scattering and emission in the forward and backward directions. The signals from single x-ray photons are accumulated permitting continuous single-shot acquisition at 120 Hz.