Speaker
Dr
Masaki Kataigiri
(Japan Atomic Energy Research Institute)
Description
We have been developing a neutron imaging gas detector with a high
spatial resolution and with a high temporal response for the neutron
scattering instruments at the pulsed neutron source in the Japan
proton accelerator research complex.
To meet the requirements for the instruments for neutron
reflectometory or for small angle neutron scattering, where a
spatial resolution of less than 1 mm and a pulse–pair resolution of
less than 1 us are required, the gas detector with individual read-
outs was developed. The detector comprises the gas vessel which
withstands up to 10 atm with the feed-throughs of 541 channels,
multi-channel fast amplifier-shaper-discriminator boards, data
encoding and taking system.
The performances of the prototype detector using a multi-wire (MW)
detector head, which has an active area of 40 x 40 mm^2 with a wire
pitch of 1 mm for each dimension, were evaluated using a collimated
neutron beam. It was confirmed that the detector exhibited a
spatial resolution of 1.5 mm and a pulse-pair resolution of about
100 ns with a gas pressure of 6 atm helium with a mixture of 30%
CF4. The position-linearity with a deviation less than 1 % was also
confirmed.
Moreover, the micro-strip (MS) detector head, which has an active
area of 50x50 mm^2 with a strip pitch of 0.4 mm for each dimension,
was installed on the detector system and the performances were also
evaluated up to the total gas pressure of 8 atm.
In the presentation the results obtained by the detector with the
MW / MS heads are presented as well as the description of the
developed detector system.
Primary author
Dr
Tatsuya Nakamura
(Japan Atomic Energy Research Institute)
Co-author
Dr
Masaki Kataigiri
(Japan Atomic Energy Research Institute)
