BIW2012 - List of Authors (Bicrel, B.)

Paper	Title	Page
TUPG006	PDV Investigations on the CESAR Facility: 700 keV, 350 kA Pulsed Electron Beam	1
	B. Cadilhon, B. Bicrel, T. Desanlis, A. Galtié, L. Voisin CEA, Le Barp, France
	CESAR is a high current electron beam facility. It consists of a 2Ω pulsed power generator which can deliver a 350kA, 700kV, 65ns pulsed electron beam thanks to a vacuum diode. The electron beam is focused on a target material in which it deposits its energy very quickly. Different measurement techniques are investigated such as impulse, rear surface motion or pressure to study thermo-mechanical behaviour of studied materials. Former works* have already been carried out using diagnostics such as time resolved spectrometer or x-ray imagery to define the main characteristics of the electron beam. Today, we are focusing on the measurement of surface velocities up to several hundreds meters-per-second on different types of shock physics experiments. It is a time resolved surface velocimetry using the heterodyne technique. This diagnostic is assembled with single-mode fiber lasers to deliver light to and from the target. The return Doppler-shifted light is mixed with the original laser light to generate a beat frequency proportional to the velocity. We describe here our approach to measure velocities with heterodyne technique. We present recent data obtained with this diagnostics.

Paper

Title

Page

PDV Investigations on the CESAR Facility: 700 keV, 350 kA Pulsed Electron Beam

1

B. Cadilhon, B. Bicrel, T. Desanlis, A. Galtié, L. Voisin
CEA, Le Barp, France

CESAR is a high current electron beam facility. It consists of a 2Ω pulsed power generator which can deliver a 350kA, 700kV, 65ns pulsed electron beam thanks to a vacuum diode. The electron beam is focused on a target material in which it deposits its energy very quickly. Different measurement techniques are investigated such as impulse, rear surface motion or pressure to study thermo-mechanical behaviour of studied materials. Former works* have already been carried out using diagnostics such as time resolved spectrometer or x-ray imagery to define the main characteristics of the electron beam. Today, we are focusing on the measurement of surface velocities up to several hundreds meters-per-second on different types of shock physics experiments. It is a time resolved surface velocimetry using the heterodyne technique. This diagnostic is assembled with single-mode fiber lasers to deliver light to and from the target. The return Doppler-shifted light is mixed with the original laser light to generate a beat frequency proportional to the velocity. We describe here our approach to measure velocities with heterodyne technique. We present recent data obtained with this diagnostics.