TY  - CONF
AU  - Yuri, Y.
AU  - Fukuda, M.
AU  - Yuyama, T.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Transverse Profile Shaping of a Charged-Particle Beam using Multipole Magnets - Formation of Hollow Beams -
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The use of multipole magnets enables us to shape the transverse profile of a charged-particle beam into various ones that can never be realized through linear beam optics. To date, the formation of a large-area beam with a uniform transverse intensity distribution has been actually realized using octupole magnets in several accelerator facilities. In this presentation, we demonstrate the formation of different beam profiles using multipole magnets rather than existing rectangular uniform beams. Results of tracking simulations and beam-formation experiments will be shown on the formation of clear-cut beams with different cross-sectional shapes, depending on the order and strength of applied multipole magnets. The dynamic behavior of a beam focused with multipole magnets is also investigated theoretically to better understand the numerical and experimental results.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 184
EP  - 186
KW  - octupole
KW  - target
KW  - optics
KW  - multipole
KW  - radiation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPGW041
UR  - http://jacow.org/ipac2019/papers/mopgw041.pdf
ER  - 

TY  - CONF
AU  - Hosaka, Y.
AU  - Honda, Y.
AU  - Kosuge, A.
AU  - Omori, T.
AU  - Sakaue, K.
AU  - Takahashi, T.
AU  - Uesugi, Y.
AU  - Urakawa, J.
AU  - Washio, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Mode-Locked Pulse Oscillation of a Self-Resonating Enhancement Optical Cavity
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - A power enhancement optical cavity is a compelling means of realizing a pulsed laser with a high peak power and high repetition frequency, which is not feasible using a simple amplifier scheme. However, a precise feedback system is necessary for maintaining the narrow resonance condition of the optical cavity; this has become a major technical issue in developing such cavities. We have developed a new approach that does not require any active feedback system, by placing the cavity in the outer loop of a laser amplifier. We report on the first demonstra-tion of a mode-locked pulse oscillation using the new system.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1471
EP  - 1474
KW  - cavity
KW  - laser
KW  - resonance
KW  - controls
KW  - feedback
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPGW032
UR  - http://jacow.org/ipac2019/papers/tupgw032.pdf
ER  -