D-D fusion neutron-spectra measurements and ion-temperature determination at Alcator C
A neutron spectrometer system has been designed, assembled, and used to measure the D-D neutron spectrum at Alcator C. The design of the shielding and collimation was critical to the successful measurement of the spectrum and involved an integral approach in which the neutronics of the Alcator C was exploited to obtain a successful system. The system consists of a /sup 3/He ionization chamber mounted in a multi-component shield system. Essentially the outermost part of the shield and collimator has been designed to moderate the MeV-range neutrons to thermal energies. The inner part of the shield is designed to capture the thermalized neutrons with a minimum of gamma production. As a result, measurements during plasma discharges indicate that the ratio of the number of counts in the 2.45-MeV peak to the total number of neutron counts in the ion chamber is 1.67.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
- DOE Contract Number:
- AC02-78ET51013
- OSTI ID:
- 6424163
- Report Number(s):
- DOE/ET/51013-65; PFC/RR-83-3; ON: DE83011020
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALCATOR DEVICE
NEUTRON SPECTROMETERS
DESIGN
DEUTERIUM
IONIZATION CHAMBERS
NEUTRON SPECTRA
THERMONUCLEAR REACTIONS
CLOSED PLASMA DEVICES
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEOSYNTHESIS
ODD-ODD NUCLEI
RADIATION DETECTORS
SPECTRA
SPECTROMETERS
STABLE ISOTOPES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics