Abstracts Brochure - CERN

TUPLS — Poster Session 27-Jun-06 16:00 - 18:00
Beam Commissioning of Ion Cooler Ring, S-LSR
S-LSR is a new ion cooler ring constructed
in Kyoto University. The circumference is
22.557 m and the maximum magnetic rigidity
is 1 Tm. The constructiion and the vacuum
baking had been finished in September,
T. Shirai, S. Fujimoto, M. Ikegami, A. Noda, H. Souda, M. Tanabe,
H. Tongu (Kyoto ICR) H. Fadil (MPI-K) T. Fujimoto, S.I. Iwata, S.
Shibuya (AEC) K. Noda (NIRS) I.A. Seleznev, E. Syresin (JINR)
2005. The beam commissioning was started since October, 2005. The injected beam is 7 MeV proton from the existing
linac. The beam circulation test and the electron beam cooling were carried out successfully and the beam information
and the characteristics of the ring were measured. One of the subjects of S-LSR is a realization of the crystalline beams
using the electron and laser cooling. The lattice of S-LSR was designed to suppress the beam heating as much as
possible and we also present such measurement results in this paper.
Peculiarities of Electron Cooler Operation and Construction at Ultra Low Energy in an
Electrostatic Ring
Few projects of electrostatic rings with electron
cooler are discussed now. Electron cool- E. Syresin (JINR)
ing at low electron energy of 10 eV was realized
at the KEK electrostatic ring. The electron cooling permits to suppress the ion multi scattering on residual gas
atoms and allows increasing the ion lifetime. Peculiarities of an electron cooler operation and construction at ultra low
energy in an electrostatic ring are considered. The cooler gun operation regime is cardinally changed at a reduction
of the electron energy to a value comparable with a cathode work function. A virtual cathode and ohmic resistance
of cathode emitter give an input in beam formation at ultra low energy. Effective electron cooling of heavy atomic
and bimolecular ions at mass of 100-1000 is reached at a small photocathode diameter of 1 mm and a high magnetic
expansion factor of 10 -1000 . The electron cooler construction has traditional design in KEK electrostatic ring. The
cooler construction can be simplified at a small circumference of electrostatic ring. Straight cooler schemes without
toroidal magnets permit to reduce ring space required for electron cooler.
Status of the HESR Electron Cooler Design Work
The electron energy of the HESR electron
cooler shall be variable from 450 keV to 4.5
MeV. Furthermore, the design shall not exclude
a further upgrade to 8 MeV. Operation
of the HESR in a collider mode, which re-
D. Reistad, T. Bergmark, O. Byström, B. Gålnander, S. Johnson,
T. Johnson, T. Lofnes, G. Norman, T. Peterson, K. Rathsman, L.
Westerberg (TSL) H. Danared (MSL)
quires electron cooling of both protons and antiprotons traveling in opposite directions, is an interesting option. The
status of the technical design of the HESR electron cooling system will be presented.
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