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Recent developments of low-emittance electron guns for accelerator are reviewed. In the acceleratorˆeld, DC biased triode thermionic gun (Pierce type gun) has been widely used and is still conventional. On the other hand, because of strong demands on the high brightness electron beam by FEL and other advanced accelerator concepts based on linear accelerator, the low emittance beam generation becomes one of the most important issue in the accelerator science. The R&D eŠort is"accelerated" by twodoi:10.3131/jvsj2.55.29 fatcat:3bxhgynzb5anrlf2po5zriu36a