| Autor: |
Smither, Robert K., Greenwood, Lawrence R., Hendel, Hans |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; May85, Vol. 56 Issue 5, p1078, 3p |
| Abstrakt: |
A new method has been found to measure the ion temperature of a hot D-T plasma. The new method makes use of two new neutron dosimetry reactions, [sup 54]Fe(n,2n)[sup 53]Fe and [sup 27]A1(n,2n)[sup 26] A1. What makes these reactions special is that their threshold energies are quite close to the centroid of the energy distribution of the neutrons emitted from a D-T plasma. This makes their reaction yields sensitive to only the upper half of the neutron energy distribution and therefore sensitive to both changes in the centroid and the width of the neutron energy distribution. The sensitivity to the width of the neutron energy distribution allows one to measure the ion temperature. If the plasma is in thermal equilibrium the ion temperature can be calculated from the ratio of the yields of the [sup 54]Fe(n,2n)[sup 53]Fe reaction to the [sup 27]A1(n, p)[sup 27]Mg reaction or a similar nonsensitive reaction. No absolute measurements are needed. Using both of the new dosimetry reactions the asymmetry of the neutron energy distribution for nonequilibrium conditions (neutral beams) can be measured. The [sup 54]Fe(n,2n)[sup 53]Fe reaction is sensitive enough to monitor a single shot in TFTR. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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