Modern Physics Ques 194
- Results of calculations for four different designs of a fusion reactor using D-D reaction are given below. Which of these is most promising based on Lawson criterion ?
(2009)
(a) Deuteron density $=2.0 \times 10^{12} $ $cm^{-3}$, confinement time $ =5.0 \times 10^{-3} $ $s $
(b) Deuteron density $=8.0 \times 10^{14} $ $cm^{-3}$, confinement time $=9.0 \times 10^{-1} $ $s$
(c) Deuteron density $=4.0 \times 10^{23} $ $cm^{-3}$, confinement time $ =1.0 \times 10^{-11}$ $ s $
(d) Deuteron density $=1.0 \times 10^{24} $ $cm^{-3}$, confinement time $ =4.0 \times 10^{-12} $ $ s $
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Answer:
Correct Answer: 194.(b)
Solution:
Formula:
- As given in the paragraph, a reactor is termed successful, if
$ n t _0>5 \times 10^{14} $ $s $ $cm^{-3} $
BETA
