Conceptual design for a fast neutron ionization chamber for fusion reactor plasma diagnostics

摘要

A conceptual design for a radiation-hard ''pointing'' fast neutron ionization chamber that is capable of delivering a 1 MHz countrate of T(D,n) events at ITER is given. The detector will use a (approximately)1 cm(sup 3) volume of CO(sub 2) fill gas at 0.1 bar pressure in a 500 V/cm electric field. The pulse widths will be (approximately)10 ns, enabling it to operate in a flux of (approximately) 6 (times) 10(sup 13) DT n/cm(sup 2)/sec. A special collimator design is used, giving an estimated angular resolution of 4.5 degrees HWHM.