Table 1: Experimental results of bootstrap current in tokamak devices.
Tokamak Devices   time   $I_{\rm b}(MA)$   $f_{\rm bt}($%)
TFTR 1988 0.52 58
JET 1989 0.85 28
$\rm JT-60$ 1990 0.37 77
${\rm JT}-60U$ 1992 0.85 58

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