Limiting effects in double EEX beamline

[摘要] The double emittance exchange (EEX) beamline is suggested to overcome the large horizontal emittance and transverse jitter issues associated with the single EEX beamline while preserving its powerful phase-space manipulation capability. However, the double EEX beamline also has potential limitations due to coherent synchrotron radiation (CSR) and transverse jitter. The former limitation arises because double EEX uses twice as many bending magnets as single EEX which means stronger CSR effects degrading the beam quality. The latter limitation arises because a longitudinal jitter in front of the first EEX beamline is converted into a transverse jitter in the middle section (between the EEX beamlines) which can cause beam loss or beam degradation. In this paper, we numerically explore the effects of these two limitations on the emittance and beam transport.

[发布机构] Pohang Accelerator Laboratory, Pohang, Gyeongbuk; 790-784, Korea, Republic of^1;Argonne National Laboratory, Argonne; IL; 60439, United States^2

[关键词] Beam transport;Bending magnets;Coherent synchrotron radiation;Emittance exchange;Emittances;Limiting effects;Middle section;Phase spaces