Development of a neutron spectrometer, counter telescope with thick radiator, for TFTR D-T experiments

M. Osakabe, J. Fujita, J. Kodaira, M. Sasao, H. Yamanishi, S. Itoh, M. D. Diesso, L. C. Johnson, A. L. Roquemore

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3 Citations (Scopus)


A ΔE-E type proton recoil telescope, called COTETRA, was developed and is presently being applied to TFTR D-T fusion experiments. Two types of COTETRA were prepared for this experiment. One set is used primarily for high-resolution measurements of the neutron energy and uses Si diode as an E detector (set A), while another set (set B) uses a plastic scintillator to attain high count-rate capability. Both sets of COTETRA have small physical dimensions and use fast NIM electronic modules for high neutron flux rate measurements. A data acquisition system has been developed for the TFTR CAMAC system. A calibration experiment has been performed using a D-T neutron generator. Energy resolution of 4.0% is obtained for set A. Set B is expected to work at a count rate of up to 104 cps, which corresponds to a neutron flux rate of ∼109 (n/cm2)/s at the detector position. Currently, both of them are installed under the multichannel neutron collimator of TFTR.

Original languageEnglish
Pages (from-to)920-922
Number of pages3
JournalReview of Scientific Instruments
Issue number1
Publication statusPublished - 1995

All Science Journal Classification (ASJC) codes

  • Instrumentation


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