Abstracts Brochure - CERN

TUPCH — Poster Session 27-Jun-06 16:00 - 18:00
THz Diagnostic for the Femto-second Bunch Slicing Project at the Swiss Light Source
Interaction of electron bunches with a femtosecond
Ti:Sa laser beam along a modulator V. Schlott, D. Abramsohn, G. Ingold, D. Suetterlin (PSI)
wiggler in the SLS storage ring results in an
energy modulation of the electron beam on the scale of the laser pulse length. While high energy photon pulses
(5-20 keV, 100 fs long) are produced by an in-vacuum undulator (radiator) and used for time resolved experiments
within the SLS femto-second bunch slicing project, coherent synchrotron radiation (CSR) emitted by the adjacent
bending magnet in the THz-regime is used for longitudinal slicing diagnostics and monitoring of slicing efficiency.
The paper describes the simulation and layout of the THz-diagnostic beam-line including the measurement of the
transfer function performed with a Bruker Optics IFS 66v/S spectrometer. The longitudinal slicing diagnostics and
first determinations of slicing efficiencies are presented as well.
Status of Synchrotron Radiation Monitor at TLS
Synchrotron radiation monitor of the Taiwan
Light Source have been upgraded recently. C.H. Kuo, J. Chen, K.-T. Hsu, S.Y. Hsu (NSRRC)
Improvement of optics and modelling was
performed to improve accuracy of measurement for small beam size. Synchrotron light interferometer is implemented
for complementary measurement. IEEE-1394 digital CCD camera is used to improve image transmission quality,
camera remote control and to extend dynamic range. Intensify gated camera are included in this upgrade for
dynamic property observation of the stored beam. Functionality enhancement of image analysis is also supported.
Efforts and achievements will be summarized in this report.
High-intensity Bremsstrahlung Monitoring System
The realization of promising photonuclear
technologies (a soft technology for medical
isotope production, radioactive waste handling,
activation analysis, etc) calls for the
sources of high-energy (Egamma>10MeV)
V.L. Uvarov, S.P. Karasyov, V.I. Nikiforov, R.I. Pomatsalyuk, V.A.
Shevchenko, I.N. Shlyakhov, A.Eh. Tenishev, Yu.V. Zhebrovsky
(NSC/KIPT)
and high-intensity (>=10E03W/cm2) photons. These sources may by obtained by converting a beam from a highcurrent
electron Linac into bremsstrahlung. The method of combined activation of a set of foils that have different
energy thresholds of the (gamma,n) reactions is proposed to determine the space-energy characteristics of such
radiation. In each energy range the geometrical characteristics of the bremsstrahlung flux are reconstructed from
the foil surface gamma-activity distribution. The last one is determined through one-dimensional scanning of the
foils by a specially designed detecting head that includes a linear matrix of 16 collimated semiconductor detectors
(CdZnTe; 2x2x2,mm). A preliminary analysis of the system geometry and applicability of the method was performed
by computer simulation based on the PENELOPE software. A developed PC based measuring system with CAMAC
interface is described.
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