1.

Results of calculations for four difforent designs of a fusion reactor using D-D reaction are given below. Which of these is most promising based on Lawson criterion ?

Answer»

Deuteron density `=2.0 xx 10^(12)CM^(-3)", CONFINEMENT time "=5.0 xx 10^(-3)s.`
Deuteron density `=8.0 xx 10^(14)cm^(-3)," confinement time "=9.0 xx 10^(-1)s`.
Deuteron density `=4.0 xx 10^(23)cm^(-3)", confinement time "=1.0 xx 10^(-11)s.`
Deuteron density `=1.0 xx 10^(24)cm^(-3)" confinement time "=4.0 xx 10^(-12)s`.

Solution :The product of the deuteron density and confinement time `t_(0)` should be GREATER than Lawson criteria,
`5 xx 10^(14) s cm^(-3)`
DEUTRON density `=8.0 xx 10^(+14) cm^(-3)`
confinement time `=9.0 xx 10^(-1)s`
Lawson criteria `=8.0 xx 10^(+14) xx9.0 xx 10^(-1)`
`=7.2 xx 10^(+14)`
It is not enough if the density is very high but the confinement time also should be high enough for the reaction.


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