Abstracts Brochure - CERN

THPLS013
THPLS014
THPLS015
29-Jun-06 16:00 - 18:00 THPLS — Poster Session
The Magnets of the Metrology Light Source in the Willy Wien Laboratory
P. Budz, K. Buerkmann, V. Duerr, J. Kolbe, D. Krämer, J. Rahn, G.
Wüstefeld (BESSY GmbH) I.N. Churkin (BINP SB RAS) R. Klein, G.
Ulm (PTB)
450
PTB, the German National Metrology Institute
in close cooperation with BESSY II, is
currently carrying out the project of constructing
the low-energy "Metrology Light
Source" (MLS) as a synchrotron radiation fa-
cility situated in the close vicinity of BESSY II. Construction of the MLS housing is in progress and nearly finished.
The user operation is scheduled to begin in 2008. Dedicated to metrology and technology development in the UV
and EUV spectral range, the MLS will bridge the gap that is existent since the shutdown of BESSY I. A 100 MeV
microtron delivered by Danfysik A/S will provide the electrons for the MLS with a structure of asymmetric double
bend achromat. The total circumference of the MLS is 48 m. The electron energy is ramped to the desired value
between 200 MeV and 600 MeV. The MLS magnetic lattice, consisting of 8 bending magnets, 24 quadrupole magnets,
24 sextupole magnets and 4 octupole magnets, is laid out to facilitate this operation. The contract for the MLS magnets
is awarded to the Budker Institute for Nuclear Physics. A description of the MLS magnets based on the results of the
factory acceptance tests should be presented.
Status of the Metrology Light Source
K. Buerkmann, W. Anders, P. Budz, O. Dressler, V. Duerr, J. Feikes,
H.G. Hoberg, D. Krämer, P. Kuske, R. Lange, J. Rahn, T. Schneegans,
E. Weihreter, G. Wuestefeld (BESSY GmbH) R. Klein, G. Ulm (PTB)
For more than 25 years, the Physikalisch-
Technische-Bundesanstalt (PTB) uses synchrotron
radiation at the storage rings BESSY
I and II for photon metrology in the spectral
range of UV to x-rays. Since decommission-
ing of BESSY I (1999), there is a gap in the spectral range of UV and EUV wavelength due to the higher electron energy
of BESSY II. Thus, in 2003, the Metrology Light Source (MLS), a low energy electron storage ring, was approved, as
central instrument in the future Willy Wien Laboratory (WWL). Design, construction and operation of the MLS are
realized by BESSY, based on the PTB requirements for a permanent accessible radiometry source, optimized for the
spectral range between UV up to VUV. The MLS is tuneable in energy between 200 MeV and 600 MeV, designed for
currents between 1pA up to 200mA. Civil construction of WWL in the close vicinity to BESSY is nearing completion.
The first MLS components will be installed in spring 2006, commissioning of the 100MeV Microtron is scheduled for
summer 2006, while commissioning of the storage ring will start in spring 2007. Regular user operation will begin in
January 2008. A status and an overview on the construction of the MLS are
Spectral Fingerprints of Femtoslicing in the THz Regime
K. Holldack, S. Khan, T. Quast (BESSY GmbH) R. Mitzner (Universität
Muenster, Physikalisches Institut)
Femtosecond (fs) THz pulses are observed as
a consequence of laser-induced energy modulation
of electrons in the BESSY II storage
ring in order to generate fs x-ray pulses via
femtoslicing*. The THz pulses are spectrally characterized by step-scan and rapid scan FTIR spectroscopy. The
temporal shape of the laser-induced density modulation is reconstructed from the THz spectra. It is studied as a
function of laser and storage ring parameters and monitored over several revolutions. The results are compared with
numerical simulations. The THz spectra acquired over a few seconds are used to optimize the laser parameters for
achieving minimum x-ray pulse lengths in femtoslicing experiments.