PAC2013 - List of Authors (Takahashi, T.)

Paper	Title	Page
TUPSM01	Study on 2 Cell RF-Deflector Cavity for Ultra-short Electron Bunch Measurement	628
	T. Takahashi, Y. Nishimura, M. Nishiyama, K. Sakaue, M. Washio Waseda University, Tokyo, Japan T. Takatomi, J. Urakawa KEK, Ibaraki, Japan
	Funding: Work supported by JSPS Grant-in-Aid for Scientific Research (A) 10001690 and the Quantum Beam Technology Program of MEXT. We have been studying on a system to measure ultra-short electron beam bunch length at Waseda University. We adopted the rf-deflector system which can convert the longitudinal distribution to transverse by sweeping the electron bunch. We used HFSS for designing the rf-deflector cavity and GPT for beam tracking. In order to achieve the desired magnitude of magnetic field in the rf-deflector, we decided to use a 2-cells cavity of rectangular structure. Finally we optimized the design for the rf-deflector which is operating on π-mode, standing wave, dipole (TM120) mode at 2856 MHz. We have confirmed this rf-deflector has enough performance, which is 100 femt seconds bunch measurement, by GPT simulations. Now we have finished manufacturing with the collaboration of High Energy Accelerator Research Organization (KEK). We could adjust resonant frequency to 2856 MHz and combine the waveguide with the rf-deflector precisely. We will integrate the rf-deflector into an S-band Cs-Te photocathode rf electron gun system in Waseda University, and carry out bunch length measurement in this summer. In this conference, we will report the present progresses and future plan.

Paper

Title

Page

Study on 2 Cell RF-Deflector Cavity for Ultra-short Electron Bunch Measurement

628

T. Takahashi, Y. Nishimura, M. Nishiyama, K. Sakaue, M. Washio
Waseda University, Tokyo, Japan
T. Takatomi, J. Urakawa
KEK, Ibaraki, Japan

Funding: Work supported by JSPS Grant-in-Aid for Scientific Research (A) 10001690 and the Quantum Beam Technology Program of MEXT.
We have been studying on a system to measure ultra-short electron beam bunch length at Waseda University. We adopted the rf-deflector system which can convert the longitudinal distribution to transverse by sweeping the electron bunch. We used HFSS for designing the rf-deflector cavity and GPT for beam tracking. In order to achieve the desired magnitude of magnetic field in the rf-deflector, we decided to use a 2-cells cavity of rectangular structure. Finally we optimized the design for the rf-deflector which is operating on π-mode, standing wave, dipole (TM120) mode at 2856 MHz. We have confirmed this rf-deflector has enough performance, which is 100 femt seconds bunch measurement, by GPT simulations. Now we have finished manufacturing with the collaboration of High Energy Accelerator Research Organization (KEK). We could adjust resonant frequency to 2856 MHz and combine the waveguide with the rf-deflector precisely. We will integrate the rf-deflector into an S-band Cs-Te photocathode rf electron gun system in Waseda University, and carry out bunch length measurement in this summer. In this conference, we will report the present progresses and future plan.