Abstracts Brochure - CERN

THPLS116
THPLS117
THPLS118
29-Jun-06 16:00 - 18:00 THPLS — Poster Session
Undulator Magnet for Terahertz FEL
M.L. Petrosyan, L.A. Gabrielyan, M.L. Petrosyan, G.K. Tovmasyan
(YerPhI)
480
The description and results of research of undulator
magnet characteristics are presented.
The undulator is tapered type and is collected
from permanent magnets made of fer-
romagnetic materials. The length of the undulator is 2.7 meters with the period of 9 sm. The additional windings on
poles of undulator are used to indemnificate the disorder of magnetic induction values of elements. The Hall sensor
and a pulse method of measurement of integrated characteristics with the help of a longitudinal string are used for
research of magnetic characteristics.
In-vacuum and FEL Undulators at Danfysik
F. Bødker, H. Bach, E.B. Christensen, E. Juul, C.W.O. Ostenfeld, M.
Pedersen, T.L. Svendsen (Danfysik A/S)
Danfysik has recently designed and produced
two in-vacuum insertion devices. The
first device is a 19 mm period device made
for the Swiss Light Source and the second is
a 20 mm period device for SOLEIL. Both are hybrid undulators with Samarium Cobalt magnets where the SLS device
is made with steel poles while the SOLEIL undulator is optimized for high peak field using Vanadium Permendur
poles and relative large magnet blocks. A quasi-periodic undulator has been built for FEL applications at the FOM-
Institute for Plasma Physics. The device is based on a standard pure permanent undulator design but then converted
into a quasi-periodic device. The magnetic performance of the device was in excellent agreement with theoretical
calculations with high suppression of the 3. and 5. harmonics. A conventional undulator has also been built for FEL
applications at FZR Rossendorf. A high degree of software assistance and automation has been developed for the
magnet mounting, shimming and magnetic testing of the insertion devices. This technique reduces the shimming
time significantly, reduces the need for highly trained personnel and results in superior magnetic performance.
Status of the SOLEIL Insertion Devices
F. Briquez, C. Benabderrahmane, P. Berteaud, O.V. Chubar, A. Dael,
L. Dubois, J.-M. Filhol, M. Girault, O. Marcouillé, F. Marteau, M.
Massal, F. Paulin, M.V. Valleau, J. Vétéran (SOLEIL) M.-E. Couprie
(CEA)
SOLEIL is the French 2.75 GeV synchrotron
radiation light source of low emittance under
construction near Paris. It will provide high
intensity photons covering a wide spectral
range from the IR to the hard x-rays. The storage
ring commissioning will start in April
2006, and the first photons in the beam lines are expected during summer 2006. The first set of Insertion Devices
(ID) will be installed before the commissioning or within the first year of operation of the machine. They consist
of one 640 mm period and three 256 mm period electromagnetic helical undulators, three 80 mm period Apple II
type undulators, and three 20 mm period in-vacuum undulators. All these ID’s make use of a wide panoply of
technical solutions for generating various types of magnetic fields. Magnetic and conceptual designs were performed
by SOLEIL, and the technical realisation was carried out together with the different manufacturers. The design
specificities of the different types of ID’s and the magnetic field characterisation and optimisation will be reported.
The first commissioning on the beam of these undulators will be described.