Abstract
Experiments with a liquid 3He target with convectional circulation and a liquid 4He cooling system are described. A theoretical treatment is given which agrees with the experimental results. If properly constructed, the target can take up more than 1 W. In that case the 3He leaving the reaction region must have a temperature near 3 K, which is higher than the temperatures measured directly. A small expansion vessel on top of the heat exchanger appeared to be important for the functioning of the target under conditions of high power dissipation. On the basis of our calculations, the variation of the experimental averaged target thickness with the beam power of the NIKHEF 3He target at Amsterdam can be largely explained.
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