Reduction of Multipole Fields in Photocathode RF Gun
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概要
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Photocathode rf gun, the high-brightness electron source with extremely low emittance is highly required for future light sources such as X-ray free electron lasers (XFEL). The coupling hole between the waveguide and the cavity of a photocathode rf gun causes asymmetries in the rf fields at the coupler cell. The dipole and quadruple fields are the dominant sources of the transverse rf emittance growth. In the BNL Gun-III, the dipole field is reduced by adding a symmetric pumping hole at the opposite side of the waveguide coupling hole. The dipole field can be reduced further by adjusting the size of the pumping hole. However, the quadruple field cannot be suppressed by the single pumping hole. We have designed new rf cavity in which the quadruple field as well as the dipole one are suppressed. In this design, two additional pumping ports are placed at the 90° positions with respect to the coupling hole and the pumping holes. Beam dynamics simulation for newly designed rf gun shows that the vertical transverse emittance is reduced by about 60% compared to the old one.
- 2010-08-25
著者
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Ko In
Department Of Physics Pohang University Of Science And Technology
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Namkung Won
Department Of Chemical Engineering And Energy & Environment Research Center Korea Advanced Insti
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Park Sung-ju
Pohang Accelerator Laboratory Postech
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Cho Moohyun
Department Of Physics Postech
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Hong Juho
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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Moon Sungik
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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Parc Yongwoon
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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Park Sung-Ju
Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea
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Cho Moohyun
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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Ko In
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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Namkung Won
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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