Abstract
The Laser MegaJoule (LMJ) located at CEA-CESTA will be equipped with x-ray plasma diagnostics using different kinds of x-ray components such as filters, mirrors, crystals, detectors and cameras. To guarantee LMJ measurements, detectors such as x-ray cameras need to be regularly calibrated. An x-ray laboratory is devoted to this task and performs absolute x-ray calibrations for similar x-ray cameras running on Laser Integration Line (LIL). This paper presents the x-ray calibration bench with its x-ray tube based High Energy x-ray Source (HEXS) and some calibration results. By mean of an ingenious transposition system under vacuum absolute x-ray calibration of x-ray cameras, like streak and stripline ones, can be carried out. Coupled to a new collimation system with micrometric accuracy on aperture sensitivity quantum efficiency measurements can be achieved with reduced uncertainties.
Highlights
The Laser Integration Line (LIL) at CEA-CESTA near Bordeaux is a Laser MégaJoule (LMJ) laser line prototype and a laser-matter interaction plasma source facility as well
The Laser MégaJoule (LMJ) located at CEA-CESTA will be equipped with x-ray plasma diagnostics using different kinds of x-ray components such as filters, mirrors, crystals, detectors and cameras
Further comparisons made with previous work show that our measurements reproduce qualitatively the x-ray framing camera (XFC) behaviour observed on LURE synchrotron [5]: in particular we observe the same rising of XFC yield at high energy
Summary
The LIL at CEA-CESTA near Bordeaux is a LMJ laser line prototype and a laser-matter interaction plasma source facility as well. To analyze the corresponding x-ray emission spectrum different kinds of plasma diagnostics are used around the interaction chamber of this facility. For a correct interpretation of measurements performed with plasma diagnostics using these detectors it has been shown [1] that they need to be regularly calibrated before each experimental campaign. To achieve this goal we have been developing a new x-ray calibration laboratory since 2008 which aims to carry out absolute x-ray calibration on these kinds of cameras with the continuous concern of reducing uncertainties. This paper describes the HEXS calibration bench with some results obtained on x-ray detectors and comparisons with theoretical models
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