Abstracts Brochure - 2nd International Particle Accelerator Conference

Poster Panel 35
ID: 2926 - WEPS011
Application of Orbit Response Matrix Method at
CSNS/RCS, Yuwen An, Sheng Wang, Yuanyuan
Wei (IHEP Beijing, Beijing) - China Spallation
Neutron Source (CSNS) accelerator consists of an
H- linac and a Rapid Cycling Synchrotron(RCS).
RCS operates at 25Hz, accumulates 80MeV proton
beam, and accelerates to 1.6GeV. Application of
response matrix(RM) method to RCS has been
studied. The closed orbit correction can be well
performed by optimizing solution algorithm. To
calibrate the lattice function, the fudge factors of
quadrupoles, the offset of beam position monitors
are obtained by using RM methods, and the study to
improve the measurement accuracy has been done.
The detailed simulation results in the study are
shown in this paper.
Sub Classification: A04 Circular Accelerators
Poster Panel 36
ID: 2769 - WEPS012
Commissioning of Slow Extraction in HIRFL-
CSR, Jian Shi, Weiping Chai, Jie Li, Peng Li,
Ruishi Mao, Jia Wen Xia, Jiancheng Yang, Da Yu
Yin, Youjin Yuan (IMP, Lanzhou) - The HIRFL-
CSR* contains a complex in cancer therapy**, and
we realized the 1/3 order resonant slow extraction in
May 2008. In order to improve the beam quality that
required in the clinical treatment, we have
performed 5 times machine study. The extraction
efficiency has been improved to 65% by change the
shape of the separatrix, and the spot size in the target
is less than 3.5mm in FWHM, the spill uniformity
we obtained excelled 97%.In the 5th time, we
utilized the fast quadrupole to make a feedback, the
spill quality been improved a lot. We report the
latest commissioning result about the slow
extraction and spill quality in HIRFL-CSR.
* J.W. Xia, W.L. Zhan et al., Nuclear Instrum.
Methods A 488, 11 (2002).
** Y.J Yuan, High Power Laser and Particle Beams
17(2), Feb 2005. Funding Agency
Sub Classification: A04 Circular Accelerators
Poster Panel 37
ID: 3087 - WEPS033
Matching Laser Driven Proton Injectors to CH -
Drift Tube Linacs, Ali Almomani, Martin Droba,
Ulrich Ratzinger (IAP, Frankfurt am Main), Ingo
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Classification 4: Hadron Accelerators
11
Hofmann (GSI, Darmstadt; HIJ, Jena) -
Experimental results and theoretical predictions in
laser acceleration of protons achieved energies of ten
to several tens of MeV. This study demonstrates the
transporting and focusing of laser-accelerated 10
MeV protons by a pulsed magnetic solenoid with a
field gradient up to 18 T. The unique features of the
protons distribution like extremely small emittances
and high yield of the order of 10^13 protons per
shot, make them attractive for study. The possibility
of using these protons as a source of energetic ions
for ion accelerators is addressed. With respect to
transit energies, further acceleration by matching
into rf linac seems adequate. The bunch injection
into a proposed CH- structure is under investigation
at IAP Frankfurt. Options and simulation tools are
presented.
Sub Classification: A08 Linear Accelerators
Poster Panel 38
ID: 3576 - WEPS036
First Coupled CH Power Cavity for the FAIR
Proton Injector, Robert Brodhage, Christopher
Fix, Holger Podlech, Ulrich Ratzinger (IAP,
Frankfurt am Main), Gianluigi Clemente, Lars
Groening (GSI, Darmstadt) - For the research
program with cooled antiprotons at FAIR a
dedicated 70 MeV, 70 mA proton injector is
required. The main acceleration of this room
temperature linac will be provided by six CH
cavities operated at 325 MHz. Each cavity will be
powered by a 2.5 MW Klystron. For the second
acceleration unit from 11.5 MeV to 24.2 MeV a 1: 2
scaled model has been built. Low level RF
measurements have been performed to determine the
main parameters and to prove the concept of coupled
CH cavities. For this second tank technical and
mechanical investigations have been performed in
2010 to develop a complete technical concept for the
manufacturing. In Spring 2011, the construction of
the first power prototype has started. The main
components of this cavity will be ready for
measurements in summer 2011. At that time, the
cavity will be tested with a preliminary aluminum
drift tube structure, which will allow precise
frequency and field tuning. This paper will report on
the recent technical development and achievements.
It will outline the main fabrication steps towards that
novel type of proton DTL. Also first low level RF
measurements are expected.