Calorimetric-time-of-flight technique for determination of energy spectra of particles from a high intensity pulsed proton target

A Calorimetric-Time-Of-Flight (CTOF) technique is proposed for real-time, h igh precision measurement of neutrons spectrum, and for evaluation of charg ed particles spectra and parameters of gamma radiation. By using the CTOF t echnique, it is possible to make these measurements in framework of the sin gle experiment. This technique consists of a set of current mode time-of-fl ight instruments each having a set of organic scintillation detector placed at a different distance from a source at an interested angle from the init ial proton beam direction. The CTOF technique is applicable to burst source conditions with radiation pulse duration of some dozens of nanoseconds and intensity of the order of 10(10)-10(12) particles per pulse. Tn experiment , a cylindrical tungsten target of 20 cm in diameter, 22.5 cm thick, was ir radiated with 50 ns width, 1.2 and 0.5 GeV proton pulses of 2.5 x 10(11) pp p. One-litre scintillators followed with 120 m long light-guides and photom ultipliers were used for determining neutron and proton spectra and gamma r ays flux intensity at the angle 175 degrees from the initial proton beam di rection. The method and results of this experiment are given in this paper. (C) 2001 Elsevier Science B.V. All rights reserved.