The photoemission properties of sodium potassium antimony (NaKSb) photocathodes grown at Cornell were measured at high gradients in the UCLA Pegasus S-band photoinjector. These measurements were enabled by the flexible suitcase-loadlock system which has been developed in the last few years based on the INFN-style design and cathode plugs. Preliminary measurements have been carried out using UV (266 nm) laser pulses which were readily available to illuminate the cathode. The quantum efficiency was measured to be 1.5% at 266 nm and was shown to have a degradation time of around 4.5 days. The MTE was also measured and calculated at 266 nm using solenoid scans and linear beam transport to be .7 ± 0.2 eV. Dark current was measured with accelerating gradients of up to 75 MV/m.
NaKSb photocathode tests in a high gradient S-band photoinjector / Garcia, D.; Schaap, B.; Ody, A.; Musumeci, P.; Pennington, C.; Maxson, J.; Silvi, G. J.; Mostacci, A.; Chiadroni, E.; Giribono, A.. - (2024). [10.18429/jacow-ipac2024-wepc67].
NaKSb photocathode tests in a high gradient S-band photoinjector
G. J. Silvi;A. Mostacci;E. Chiadroni;A. Giribono
2024
Abstract
The photoemission properties of sodium potassium antimony (NaKSb) photocathodes grown at Cornell were measured at high gradients in the UCLA Pegasus S-band photoinjector. These measurements were enabled by the flexible suitcase-loadlock system which has been developed in the last few years based on the INFN-style design and cathode plugs. Preliminary measurements have been carried out using UV (266 nm) laser pulses which were readily available to illuminate the cathode. The quantum efficiency was measured to be 1.5% at 266 nm and was shown to have a degradation time of around 4.5 days. The MTE was also measured and calculated at 266 nm using solenoid scans and linear beam transport to be .7 ± 0.2 eV. Dark current was measured with accelerating gradients of up to 75 MV/m.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
