Michel Roche

160 kV, 200 mA dc accelerator for high 14 MeV neutron yield

Abstract This paper describes an electrostatic, low energy, high current accelerator (160 kV, 200 mA), being in routine operation for two years. The (d, T) reaction gives yields of 5 × 10 11 n/s·cm 2 for a neutron emission of 6 × 10 12 n/s in 4 π . In such conditions the irradiated surface has a 5 cm diameter. The deuteron beam supplied from a duoplasmatron source is conducted on rotating tritiated target. The target is movable on a rail-guided carriage mechanism which allows for automatic changing.

Energy Deposition Measurement by Thin-Film Resistors

We present a method for measuring energy deposition by resistivity variation. This method has been applied to the measurement of an intense x-ray burst and to the diagnosis of a pulsed fast reactor.

Utilisation de resistances fissiles pour la mesure de flux neutroniques intenses pulses

Abstract The measurement of pulsed neutron fluxes may be realized by a new method presented in this paper. The energy of the fissions induced in a uranium ( 235 U or 238 U) thread is measured, quasi-adiabatically, by recording its temperature through the change of its resistivity. We first review the theoretical aspects; then we go through the realization of the gauges, and finally we give the experimental results obtained for the diagnostics of a pulsed reactor. Measurements performed on the same reactor, CALIBAN, but running on two different modes - pulsed mode, using fissile resistors, and steady state, using fission chambers - show that its spectrum does not change between these two modes.

DESIGN STUDY OF A LOW-ENERGY AND HIGH-POWER ACCELERATOR.

Abstract A low-energy (150 to 250 kV), but very powerful electrostatic accelerator is described. Its purpose is to yield very intense (3 × 10 12 n cm −2 s −1 ) neutron flux (14 MeV). We can reach these neutronic results thanks to the original target holders which are presented here.

Projet d'experience de fusion par confinement inertiel utilisant un chauffage par electrons oscillant dans un miroir magnetique

Abstract We describe here a new concept aiming to the realization of inertial thermonuclear fusion by relativistic electron beams. A magnetic mirror is placed behind the exploded pusher. It allows to accelerate very high current densities owing to the role of ions in the diode, and to reflect the electrons which fluctuate round the anode and give a high enhancement of energy deposition.