TY  - CONF
AU  - Jimbo, K.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - The Betatron Equation with the Synchro-Betatron Coupling Term and Suppression of the Coupled Bunch Mode
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The synchrotron oscillation, which is both longitudinal and horizontal oscillations, occurs under a constant longitudinal velocity of revolving particle. The synchrotron and betatron equations for revolving particles are derived from the improved Hamiltonian. The betatron equation accompanys the shinchro-betatron resonant coupling term. The coherent synchrotron oscillation frequency of the bunch is defined from the integrated phase. Taking advantage of the resonant coupling term, an experiment to suppress magnetically the destabilized coupled-bunch mode of the synchrotron oscillation is proposed.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 957
EP  - 959
KW  - synchrotron
KW  - betatron
KW  - coupling
KW  - closed-orbit
KW  - dipole
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPTS045
UR  - http://jacow.org/ipac2019/papers/mopts045.pdf
ER  - 

TY  - CONF
AU  - Sei, N.
AU  - Hayakawa, K.
AU  - Hayakawa, Y.
AU  - Nogami, K.
AU  - Ogawa, H.
AU  - Ohgaki, H.
AU  - Sakai, T.
AU  - Sumitomo, Y.
AU  - Takahashi, Y.
AU  - Tanaka, T.
AU  - Zen, H.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Research of Coherent Edge Radiation Generated by Electron Beams Oscillating Free-Electron Lasers
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - We have studied far-infrared coherent radiation with an S-band linac at Laboratory for Electron Beam Research and Application (LEBRA) at Nihon University. We have already developed a couple of terahertz-wave sources based on coherent synchrotron radiation and coherent transition radiation*, which have been applied to spectroscopic research**. Moreover, we developed coherent edge radiation (CER) at the downstream bending magnets in the FEL sections. Because the edge radiation has an annular shape distribution characterized by the asymmetric first-order Laguerre-Gaussian mode, the CER can be extracted from an optical cavity of the FEL system without a diffraction loss of the FEL beam***. The root-mean-squared bunch length of the electron beam was evaulated by measuring the CER spectra, which was about the same level as the FEL micropulse width. Although the infrared FELs at LEBRA had a long slippage length, the CER intensity can be a guidepost enhancing the FEL power because of the existence of their correlation. In this presentation, the characteristics of the CER including correlation between the CER and the FEL will be reported.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1772
EP  - 1774
KW  - FEL
KW  - electron
KW  - radiation
KW  - cavity
KW  - experiment
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPRB039
UR  - http://jacow.org/ipac2019/papers/tuprb039.pdf
ER  -