Photocathode electron guns are key to the generation of high-quality electron bunches which are currently the primary source of electrons for linear electron accelerators. The photogun test bench built at the Joint Institute for Nuclear Research (JINR) is currently being used to further develop the hollow (backside irradiated) photocathode concept. A major result was the replacement of the hollow photocathode by a technologically more feasible transmission photocathode made from a metal mesh which serves as a substrate for films of various photomaterials. A number of thin-film cathodes on quartz glass substrates are fabricated by photolithography. Vectorial photoeffect (related to the surface-normal component of the wave electric field) is observed and found to significantly affect the quantum yield. The dependence of the quantum yield of diamond-like carbon photocathodes on the manufacturing technology is investigated. The Rutherford backscattering and elastic recoil detection techniques are combined to carry out the elemental analysis of the films. An estimate of the emittance of a 400 pC electron beam is obtained using the cross-section method.
Keywords: DC photoinjector, transmissive photocathode, vectorial photoeffect PACS:29.25.Bx, 79.60.−i (all) DOI:10.3367/UFNe.2017.03.038145 URL: https://ufn.ru/en/articles/2017/10/h/ Citation: Balalykin N I, Minashkin V F, Nozdrin M A, Shirkov G D, Zelenogorskii V V, Gacheva E I, Poteomkin A K, Huran J "Electron gun with a transmission photocathode for the Joint Institute for Nuclear Research photoinjector" Phys. Usp.60 1051–1058 (2017)