Abstracts Brochure - 2nd International Particle Accelerator Conference

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Classification 5: Beam Dynamics and Electromagnetic Fields
Poster Panel 47
ID: 3546 - WEPC036
Coherent Synchrotron Radiation Source Based
on an Isochronous Accumulator Ring with
Femtosecond Electron Bunches, Nuan-Ya Huang
(NTHU, Hsinchu), Wai Keung Lau (NSRRC,
Hsinchu), Hiroyuki Hama, Fujio Hinode, Shigeru
Kashiwagi, Masayuki Kawai, Fusashi Miyahara,
Toshiya Muto, Ken-ichi Nanbu, Yuu Tanaka
(Tohoku University, Sendai) - A compact
isochronous accumulator ring has been studied as a
source of coherent synchrotron radiation (CSR) at a
wavelength region from THz to GHz. Since the
thermionic rf gun is substantially stable in general,
we anticipate a bunch train of very short electron
pulses can be provided satisfactorily by means of
velocity bunching. Careful numerical simulations
show possibility of the bunch length of much less
than 100 fs with a bunch charge of 20 pC, which
will contain sufficiently large form factor for
production of CSR at the wavelengths longer than ~
0.1 mm. The coherent THz radiation of high average
power will be achieved if the short bunches can be
circulated in the accumulator ring without bunch
lengthening. This paper will describe the
optimization of thermionic injector to produce
femtosecond bunches in addition to study of the
lattice designing of complete isochronous optics for
the accumulator ring.
Sub Classification: D01 Beam Optics - Lattices,
Correction Schemes, Transport
Poster Panel 48
ID: 3082 - WEPC009
Design of an Antiproton Injection and Matching
Beam Line for the AD Recycler Ring,
Oleg Karamyshev, Galina Karamysheva, Alexander
Ivanovich Papash (JINR, Dubna, Moscow Region;
MPI-K, Heidelberg), Michele Ruth Fisher Siggel-
King, Carsten Peter Welsch (Cockcroft Institute,
Warrington, Cheshire; The University of Liverpool,
Liverpool) - A small antiproton recycler ring (AD-
Rec) for use in the MUSASHI beamline at the
CERN AD has been designed by the QUASAR
Group for operation at energies between 3 and 30
keV. A highly efficient beam line for capturing the
beam after extraction from the trap, transporting and
injecting it into the AD Rec is very important to
minimize losses and full the ring up to its space
charge limit. In this contribution, the beam optical
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and mechanical design of the injector is presented.
Funding Agency: Work supported by STFC, the
Helmholtz Association and GSI under contract VH-
NG.328.
Sub Classification: D01 Beam Optics - Lattices,
Correction Schemes, Transport
Poster Panel 49
ID: 4135 - WEPC006
Upgrade Plans on the Superconducting Electron
Accelerator S-DALINAC, Michaela Kleinmann,
Ralf Eichhorn, Florian Hug, Norbert Pietralla (TU
Darmstadt, Darmstadt) - The S-DALINAC is a
superconducting recirculating electron accelerator
with maximum design energy of 130 MeV operating
in cw at 3 GHz. Even so the gradients of the
superconducting cavities are well above design, their
design quality factor of 3*10^9 have not been
reached so far, leading to higher heat transfer into
the liquid helium than expected. Due to the limited
cooling power of the cryo-plant being 120 W, the
final energy achievable in cw operation is around 85
MeV, currently. In order to provide a cw beam with
the designed final energy in the future, the
installation of an additional recirculation path is
projected. We will report on the beam-line and the
magnet design for the new recirculation path. In
addition, we will present the layout of two proposed
scraper-systems which will be used to remove the
halo of the electron beam allowing high precision
coincidence experiments with very low background
for nuclear physics in the future.
Funding Agency: Work supported by DFG through
SFB 634
Sub Classification: D01 Beam Optics - Lattices,
Correction Schemes, Transport
Poster Panel 50
ID: 3347 - WEPC013
Tests for Low Vertical Emittance at Diamond
using LET Algorithm, Simone Maria Liuzzo,
Maria Enrica Biagini, Pantaleo Raimondi
(INFN/LNF, Frascati (Roma)), Riccardo Bartolini
(Diamond, Oxfordshire; JAI, Oxford) - We present
measurements recently performed at the Diamond
Light Source, aimed at the achievement of low
vertical emittance using the Low Emittance Tuning
(LET) algorithm developed for a SuperB factory
project presently in progress. The tests have been
focused on the comparison between this method and