Measurements of DT and DD neutron yields by neutron activation on TFTR
- Los Alamos National Lab., NM (United States)
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- JET Joint Undertaking, Abingdon (United Kingdom)
A variety of elemental foils have been activated by neutron fluence from TFTR under conditions with the DT neutron yield per shot ranging from 10{sup 12} to over 10{sup 18}, and with the DT/(DD+DT) neutron ratio varying from 0.5% (from triton burnup) to unity. Linear response over this large dynamic range is obtained by reducing the mass of the foils and increasing the cooling time, all while accepting greatly improved counting statistics. Effects on background gamma-ray lines from foil-capsule-material contaminants. and the resulting lower limits on activation foil mass, have been determined. DT neutron yields from dosimetry standard reactions on aluminum, chromium, iron, nickel, zirconium, and indium are in agreement within the {plus_minus}9% (one-sigma,) accuracy of the measurements: also agreeing are yields from silicon foils using the ACTL library cross-section. While the ENDF/B-V library has too low a cross-section. Preliminary results from a variety of other threshold reactions are presented. Use of the {sup 115}In(n,n) {sup 115m}In reaction (0.42 times as sensitive to DT neutrons as DD neutrons) in conjunction with pure-DT reactions allows a determination of the DT/(DD+DT) ratio in trace tritium or low-power tritium beam experiments.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10165475
- Report Number(s):
- LA-UR-94-1605; CONF-940552-15; ON: DE94014819; TRN: 94:014600
- Resource Relation:
- Conference: 10. topical conference on high-temperature plasma diagnostics,Rochester, NY (United States),8-12 May 1994; Other Information: PBD: 5 May 1994
- Country of Publication:
- United States
- Language:
- English
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