Absolute Bunch Length Measurements of Low Energy Beams Using Accelerating RF Cavity
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J.-G. Hwang
HZB, Berlin, Germany
Y. Honda, T. Miyajima
KEK, Ibaraki, Japan
E.-S. Kim
KUS, Sejong, Republic of Korea
The experimental technique has been proposed and demonstrated by authors for measuring the temporal distribution and absolute bunch length of picosecond-level low-energy electron bunch generated by an electron gun using radial electric and azimuthal magnetic fields of an accelerating (TM01 mode) radio frequency cavity. In this scheme, an accelerating RF cavity provides a phase-dependent transverse kick to the electrons, resulting in the linear coupling of the trajectory angle with the longitudinal position inside the bunch like a transverse deflecting cavity. In this paper, we show a detailed estimation of various aspects of the the temporal resolution of this method with feasible parameters and deconvolution of the Gaussian distribution for accurate reconstruction of the temporal distribution. Measurement of bunch length and … Ji-Gwang Hwang (Helmholtz-Zentrum, Berlin), Tsukasa Miyajima, Yosuke Honda (KEK, Tsukuba), Eun-San Kim (Sejong U.) Published in Sci. Rep. 10 (2020) no.1, 18905
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E.H. Lim
Korea University Sejong Campus, Sejong, Republic of Korea
Y.S. Chung, G.D. Kim, J.W. Kwon, H.J. Woo
IBS, Daejeon, Republic of Korea
E.-S. Kim
KUS, Sejong, Republic of Korea
RAON has various diagnostic devices for measuring beam characteristics, such as Faraday Cup, Wire Scanner, and Beam Loss Monitor, etc. Each device is driven by PLC system and acquires current data with a DAQ based uTCA system. All the parameters are controlled by EPICS as process variables (PV) and monitored on GUI of CS-Studio. PVs of PLC and DAQ were named according to the RAON naming convention. Epics sequences are written in finite state machine code to work diagnostic device sequentially. Below we show the working principle of the epics based diagnostics devices control system and measurement results.
