2015 年 12 巻 1 号 p. 34-37
P3 WS (Photocathode Physics for Photoinjector Workshop) was held in LBNL (Laurence Berkeley National Laboratory), Berkeley, California, US from Nov. 3. to 5. 2014. This is the third of the WS series which had been started in 2010 at BNL (Brookhaven National Laboratory). The WS has been held once in every two years and the second WS was at Cornell University. In the modern accelerators, the linac becomes more important because various advanced beams which are not possible in Synchrotron can be accelerated. In the modern linac, photo-cathode is one of the most critical devices which sometimes determines the accelerator performance. In the WS, photocathode and related physics were discussed from the accelerator point of view. However, not only the accelerator physicists, but also many material and condensed matter physicists attended the WS. This is a new trend in the Photocathode studies which reflects the essential role of the Photocathode in the advanced accelerators. The WS is briefly reported.