Abstracts Brochure - CERN

MOPCH — Poster Session 26-Jun-06 16:00 - 18:00
*J. Feikes et al. "Sub-Picoseconds Electron Bunches in the BESSY Storage Ring", EPAC’04, Luzerne (Switzerland), July
2004.
Plans for the Generation of Short Radiation Pulses at the Diamond Storage Ring
Diamond is a third generation light source
under commissioning in Oxfordshire UK. In R. Bartolini (Diamond) M. Borland, K.C. Harkay (ANL)
view of the increasing interest in the production
of short radiation pulses, we have investigated the possibility to operate with a low-alpha optics, the use of a
third harmonic cavity for bunch shortening and the implementation of a crab cavity scheme in the Diamond storage
ring. The results of the initial accelerator studies will be described, including the modification of the beam optics,
non-linear beam dynamics optimisation and choice of RF parameters for the crab cavity operation. The expected
performance of these schemes will be summarised.
Circulation of Short and Intense Electron Bunch in Quasi-isochronous Lattice
One new method is proposed which supplies
synchrotron radiation light from a short and
intense electron bunch. This method supplies
a short and intense x-ray pulse and extremely
strong coherent radiation in a long
Y. Shoji, Y. Hisaoka, T. Matsubara, T. Mitsui (NewSUBARU/SPring-
8, Laboratory of Advanced Science and Technology for Industry
(LASTI)) T. Asaka, S. Suzuki (JASRI/SPring-8)
wavelength region to beam lines of a storage ring. SPring-8 linac supplied a short and intense 1.0 GeV electron beam
to NewSUBARU storage ring. The electron bunch was compressed to 10ps (full width) from the normal condition
(20ps full width) using ECS system. The pulse charge was 0.10nC/bunch and the energy spread was (±) 0.2 % (full
width) at the injection point. The ring lattice was adjusted at a quasi-isochronous condition to keep the short bunch
for many revolutions. The estimated linear and non-linear momentum compaction factors were -6·10 -5 (the linear
factor), 0.0 (the second order factor) and +0.9 (the third order factor). The bunch length was measured by a streak
camera, and the coherent radiation was detected by a Shottky diode detector. The short bunch was successfully
circulated for about 50 turns.
Development of High Brightness Soft X-ray Source Based on Inverse Compton Scattering
Compact soft X-ray source based on inverse
compton scattering have been developed at
Waseda University. Using 1047nm laser light
from Nd:YLF laser scattered off 4.2MeV electron
beam generated from a photo-cathode
R. Moriyama, Y. Hama, K. Hidume, A. Oshima, T. Saito, K. Sakaue,
M. Washio (RISE) H. Hayano, J.U. Urakawa (KEK) S. Kashiwagi
(ISIR) R. Kuroda (AIST)
rf-gun, we have already suceeded to generate the soft X-ray. The energy of this x-ray is included in the part of water
window, in which absorption of water is much less than that of moleculars that organize a living body. Furthermore,
this x-ray source has other features such as short pulse, proportional mono-energy and energy variableness. Because
of these tures, the application to the biological microscope have been expected. However, the flux of x-ray is not
satisfied for the biological microscope application. Therefore, to multiply a soft X-ray flux, we utilized multi-pass
amplifier for the laser light and improved a collision chamber. In this conference, we will report the experimental
results and future plans.
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