Author/Authors :
Togawa، نويسنده , , K and Nakanishi، نويسنده , , T and Baba، نويسنده , , T and Furuta، نويسنده , , F and Horinaka، نويسنده , , H and Kurihara، نويسنده , , Y and Matsumoto، نويسنده , , H and Matsuyama، نويسنده , , T and Nishitani، نويسنده , , T and Okumi، نويسنده , , S and Omori، نويسنده , , T and Suzuki، نويسنده , , C and Takeuchi، نويسنده , , Y and Wada، نويسنده , , K and Wada، نويسنده , , K and Yamamoto، نويسنده , , M and Yoshioka، نويسنده , , M، نويسنده ,
Abstract :
Polarized electron beam with sub-nanosecond multi-bunch structure has been first produced from an InGaAs–AlGaAs strained-layer superlattice photocathode with heavy surface doping. The extracted charge of 0.6×1010e−/bunch is determined by the space charge limit of the 50 keV gun. The multi-bunch effect due to the surface charge limit phenomenon, which is peculiar to a negative electron affinity surface of semiconductor photocathode, is not observed in the second bunch separated by 2.8 ns. We conclude that a superlattice photocathode with a heavily doped surface is the best photocathode for the future linear colliders.
