Abstracts Brochure - 2nd International Particle Accelerator Conference

Poster Panel 108
ID: 3228 - MOPC108
Cornell SRF New Materials Program,
Sam Posen, Matthias Liepe, Yi Xie (CLASSE,
Ithaca, New York) - The performance of bulk
niobium accelerator cavities has come very close to
its fundamental limit set by the critical magnetic
field. To continue progress, the SRF group at
Cornell has recently pioneered an extensive program
to investigate new implementations of
superconducting cavities. We have developed
facilities to fabricate Nb3Sn, a superconductor
which will theoretically be able to reach more than
twice the maximum accelerating field of Nb in a
cavity under the same operating conditions. In
addition, with the critical temperature of Nb3Sn
being twice that of Nb, Nb3Sn would allow
operating SRF cavities with a much higher
cryogenic efficiency. We have also manufactured
TE cavities that measure the RF properties of small,
flat samples, ideal for material fabrication methods
in development. The shape of one of these cavities
puts significantly higher fields on the sample than on
the niobium cavity, allowing direct study of fields
higher than would be observable in any normal
cavity tests, a unique capability. This paper presents
an overview of the materials research program. First
results from tests of Nb3Sn samples are presented.
Funding Agency: NSF
Sub Classification: T07 Superconducting RF
Poster Panel 109
ID: 3220 - MOPC085
Establishing High Yield for High-gradient
Cavities, Felix Schlander, Sebastian Aderhold,
Eckhard Elsen, Detlef Reschke, Marc Wenskat
(DESY, Hamburg) - A series of some 600
superconducting 1.3 GHz cavities will start being
delivered to DESY by industry in early 2012.
Although a considerably smaller gradient satisfies
the needs for the European XFEL the electropolished
cavities (50% of the delivery) are deemed
to be suitable for gradients in excess of 35 MV/m,
the performance goal of the International Linear
Collider (ILC). Specifically 24 cavities will be
supplied without helium tank to enable further
investigations. The results may serve to improve
overall performance; limitations such as field
emission and thermal breakdown of
superconductivity ("quench") are still under
investigation. For this matter the DESY ILC group
has developed tools to monitor aspects of the cavity
fabrication. An automated optical mapping system
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(OBACHT) is being commissioned and will be
complemented by software for automated cavity
surface feature recognition. For cold RF tests a
Second Sound setup for locating the positions of the
thermal breakdown is routinely used. These
diagnostic tools will give guidance on postprocessing
cavities for best performance. The
current status of these projects will be described.
Funding Agency: This work is supported by the
Commission of the European Communities under
the 7th Framework Programme “Construction of
New Infrastructures – Preparatory Phase”, contract
number 206711.
Sub Classification: T07 Superconducting RF
Poster Panel 110
ID: 3580 - WEPO019
Magnetic Model of the CERN Proton
Synchrotron Main Magnetic Unit,
Mariusz Juchno (EPFL, Lausanne) - The CERN
Proton Synchrotron (PS) will remain one of the key
elements of the Large Hadron Collider (LHC)
injector system for next 20-25 years. An accurate
magnetic model of its combined-function magnets
will be essential in trimming the machine
characteristics to the requirements for the LHC and
its upgrades. A detailed 2D quasi-static analysis of
the PS magnets and their correction circuits allowed
to set-up a magnetic model taking into consideration
the magnetic field evolution and contribution of
separate magnet circuits at different field levels. An
experimental validation of the model is being carried
out through ad-hoc field measurements machine
studies iterated with a MAD-X model of the PS
machine to recreate the measured optical parameters
of the beam.
Sub Classification: T09 Room-Temperature
Magnets
Poster Panel 111
ID: 3237 - WEPO011
Design study of Electromagnet for 13MeV PET
Cyclotron, Byeong-No Lee, Jong-Seo Chai, Hyun
Wook Kim, Jin Hwan Oh, HoSeung Song (SKKU,
Suwon) - Cyclotron magnet for RI production which
used for PET scanning has been designed. Designed
pancake-shape magnet is advanced type of
KIRAMS-13*'s H-type Magnet. The AVF structure
with 20 ratio of hill and valley used for getting
strong axial focusing and produced the energy of
proton beam up to 13MeV with thin stripper foil. To
design and analyze the magnet CAD and TOSCA
were used, respectively. Footnotes KIRAMS-13* is