Abstracts Brochure - CERN

MOPCH — Poster Session 26-Jun-06 16:00 - 18:00
optimum locations behind the spoiler, we analyze the beam losses and calculate the cleaning efficiency from tracking
studies. The results are compared with those of the conventional linear collimation system.
CRYRING as an Antiproton and Ion Decelerator at FAIR
At the FLAIR facility (Facility for Low-energy
Antiproton and Ion Research) at FAIR, H. Danared, A. Källberg, A. Simonsson (MSL)
antiprotons and heavy ions will be decelerated
to very low energies and ultimately to rest. One step in this deceleration is made in the magnetic storage ring LSR
(Low-Energy Storage Ring). CRYRING at the Manne Siegbahn Laboratory in Stockholm will be closed down within
the next few years, and since CRYRING has an energy range quite similar to the proposed LSR, is equipped with
beam cooling, and has several other features required for a deceleration ring, plans are being made for the transfer
of CRYRING to FAIR and for its use as the LSR ring. This paper describes some of the characteristics of CRYRING
relevant for its new role, modifications that need to be made, and test that have been performed at CRYRING with, e.g.,
deceleration of protons from 30 MeV to 300 keV kinetic energy, which is the proposed energy range for antiprotons
at LSR.
Design of the Double Electrostatic Storage Ring DESIREE
A double electrostatic storage ring named
DESIREE is under construction at the Manne
Siegbahn Laboratory and Stockholm University.
The two rings will have the same circumference,
9.2 m, and a common straight
section where merged beam experiments
P. Löfgren, G. Andler, L. Bagge, M. Blom, H. Danared, A. Källberg,
S. Leontein, L. Liljeby, A. Paal, K.-G. Rensfelt, A. Simonsson (MSL)
H. Cederquist, M. Larsson, S. Rosén, H.T. Schmidt, K. Schmidt
(FYSIKUM, AlbaNova, Stockholm University)
with ions of opposite signs will be performed. The whole structure will be contained in a single vacuum vessel
resulting in a very compact design. In addition to its unique double ring structure it will be possible to cool DESIREE
down to 10-20K using cryogenerators. This will reduce the internal vibrational and rotational excitations of stored
molecules. A cold system will also result in excellent vacuum conditions where longer lifetimes of the stored beams
can be expected. While the ion optical calculations have entered a final phase much of the work is now devoted to
solve many of the mechanical and cryogenic challenges of DESIREE. In order to test the mechanical and cryogenic
properties of for example insulators, vacuum seals, and laser viewports a small test system has been built. The test
system is expected to provide valuable information for the final design of DESIREE.
Low-intensity Beams for LHC Commissioning from the CERN PS-booster
A variety of low-intensity beams will be required
for LHC commissioning. In contrast M. Benedikt, JT. Tan (CERN)
to the nominal LHC physics beam, these single-bunch
beams are produced without longitudinal bunch splitting in the injector chain. Consequently, not only the
transverse but also the longitudinal beam characteristics have already to be established in the CERN PS-Booster. The
required intensities extend down to four orders of magnitude below the typical PS-Booster working range and the
transverse emittances must be adjustable to vary the beam brightness over a large range. The different beam variants
are briefly summarized and the specific techniques developed for their production, like low-voltage rf capture, and
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