Magnesium Cathode: A test case for surface photoemission

par Xije Wang (BNL)

mardi 2 avr. 2013, 11:00 → 12:00 Europe/Paris

Salle 101 (LAL)

The photoemission process for most metals is dominated by volume (bulk) photoemission, and the three-step model is a good representation of this process. But Magnesium (Mg) is one of the few metals whose work function (~3.6 eV) is lower than its surface plasmon frequency (~7.7 eV), which opens the possibility of the surface photoemission or surface-plasmon assisted photoemission. Surface or surface-plasmaon assisted photoemission could be a critical technology for next generation photocathode, and it will enable a metal cathode simultaneously having a high quantum efficiency and a low thermal emittance. The operational experience of Mg photocathode at the BNL is presented in this talk. We will also discuss the experimental studies of the rough surface plasmon enhanced photoemission.

Poster SemXW.pdf