| Paper |
Title |
Page |
| TUPPH008 |
Experimental Approaches of Emittance Dilution Induced by Misalignments in a Photoinjector
|
247 |
| |
- J. H. Park, M. Babzien, K. Kusche, V. Yakimenko
BNL, Upton, Long Island, New York
|
|
| |
One of the main issues in the generation of a high-brightness electron beam is the preservation of beam emittance. Here we discuss one of possible source of emittance dilution, the rf kick, due to misalignment. The emittance of a high-brightness electron beam from a photoinjector is affected by the status of alignments due to deflection force by the accelerating field. The misaligned beam with the accelerating field axis experiences emittance growth by an electron-beam defection that is proportional to the electric field strength in the cavity. Misalignments of beam axis induce different deflections on beam particles with different energy, causing emittance dilution of the beam. In order to reduce the emittance dilution the photoinjector is required well alignments of all components. We show significant emittance growth as misalignments function against the electron beam-axis to accelerating column. We also measured the emittance change as the function of the laser position on the cathode.
|
|