Speaker
Description
A high gradient in the accelerating structure enhances beam quality and accelerator efficiency but may also lead to the "dark current" issue. In high-gradient SRF photoinjector, dark current represents an "unwanted beam". It arises from field emission in the cavity and the photocathode, which is subsequently accelerated through the gun.
In the operation of the ELBE SRF gun-II, a correlation has been observed between dark current, photocathode quantum efficiency (QE), and its lifetime. Consequently, understanding the sources and dynamics of dark current is critical for ensuring machine safety and maintaining gun performance.
This paper presents our investigations of dark current at the ELBE SRF gun-II. The beam dynamics of the dark current are analyzed using the ASTRA code, enabling us to track field-emitted electrons originating from the cathode area and other sources.
| Region represented | Europe |
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| Paper preparation format | Word |
