Author: Fedosseev, V.
Paper Title Page
MOPFI058 Studies of Cs3Sb Cathodes for the CLIC Drive Beam Photoinjector Option 413
 
  • I. Martini, E. Chevallay, S. Döbert, V. Fedosseev, C. Heßler, M. Martyanov
    CERN, Geneva, Switzerland
  
  Within the CLIC (Com­pact Lin­ear Col­lider) pro­ject, fea­si­bil­ity stud­ies of a pho­toin­jec­tor op­tion for the drive beam as an al­ter­na­tive to its base­line de­sign using a thermionic elec­tron gun are on-go­ing. This R&D pro­gram cov­ers both the laser and the pho­to­cath­ode side. Whereas the avail­able laser pulse en­ergy in ul­tra-vi­o­let (UV) is cur­rently lim­ited by the op­ti­cal de­fects in the 4th har­mon­ics fre­quency con­ver­sion crys­tal in­duced by the 0.14 ms long pulse trains, re­cent mea­sure­ments of Cs3Sb pho­to­cath­odes sen­si­tive to green light showed their po­ten­tial to over­come this lim­i­ta­tion. More­over, using vis­i­ble laser beams leads to bet­ter sta­bil­ity of pro­duced elec­tron bunches and one can take ad­van­tages of the avail­abil­ity of higher qual­ity op­tics. The stud­ied Cs3Sb pho­to­cath­odes have been pro­duced in the CERN pho­toe­mis­sion lab­o­ra­tory using the co-de­po­si­tion tech­nique and tested in a DC gun set-up. The analy­sis of data ac­quired dur­ing the cath­ode pro­duc­tion process will be pre­sented in this paper, as well as the re­sults of life-time mea­sure­ments in the DC gun.