Abstracts Brochure - CERN

THPLS128
THPLS129
THPLS130
THPLS131
29-Jun-06 16:00 - 18:00 THPLS — Poster Session
Overview of Diamond IDs for Phase 1
E.C. Longhi, A.I. Baldwin, S.P. Mhaskar, J.C. Schouten, C.W.
Thompson, R.P. Walker (Diamond) J.A. Clarke (CCLRC/DL/
ASTeC)
484
Diamond Light Source is a 3GeV synchrotron
currently under construction in the UK,
which will be operational in early 2007. It is
a third generation light source comprising 22
usable straight sections for insertion devices.
Phase 1 of beamline construction will include eight Insertion Devices: five PPM in-vacuum undulators, two APPL·10 -2
devices to be installed in the same straight, and one 3.5T superconducting wiggler. This paper describes the current
status of construction and magnetic measurements for each of the Phase 1 devices.
Field Measurements and Trajectory Calculations for the CUTE-FEL Undulator
We are building a Compact Ultrafast TEra-
B. Biswas, S. Krishnagopal, V. Kumar (RRCAT)
hertz Free-Electron Laser (CUTE-FEL) to lase
in the far infrared spectrum (80-100 microns)
using a 10 MeV electron beam from a PWT linac. We have built a 2.5 m long undulator in two sections for this FEL.
Recently, a 3-axis field measurement of this undulator has been done from which the details of the beam trajectories in
two planes have been studied. Here, we present the details of design and development of corrector coils for improving
the beam trajectory, the field measurements and trajectory calculations.
Thermal Neutron Demagnetization of NdFeB Permanent Magnets
R.W. Klaffky, B. Maranville, R. Shull (New Affiliation Request
Pending) R.M. Lindstrom (NIST)
At the Advanced Photon Source at Argonne
National Laboratory, NdFeB insertion device
magnets have shown losses of magnetization
on a few straight sections where the largest
electron beam losses occur due to limiting vacuum chamber apertures. In the worst case, these magnetization losses
were evident after a three month operational period. To isolate the effect that thermal neutrons have on these magnets,
the magnetization and coercivity were studied for two NdFeB grades as a function of dose from 7.5 x 10(12) to 6 x
10(13) neutrons/cm2. After saturation, the remanent magnetization was found to decrease linearly with the logarithm
of the dose. At a dose of 7.5 x 10(12) neutrons/cm2.sec, there was already a 43 percent magnetization loss for the N45
grade and a 15 percent loss for the N48 grade. There was no apparent change in coercivity with dose. The change
in remanent magnetization is a consequence of boron thermal neutron capture through the 10B(n,alpha)7Li reaction,
which generates MeV energy alpha particles and lithium ions.
Design and Tuning of NSRL Undulator UD-1
The design, construction, and tuning of the
Q.K. Jia (USTC/NSRL)
first undulator UD-1 in NSRL are described.
The magnetic field design and requirement
are given. The results of the magnet blocks measurement and the magnetic field tuning by interchanging magnet
blocks are presented.