For the GSI future project Facility for Antiproton and Ion Research a beam intensity of 1012U28+ionss is planned to be extracted from the GSI heavy ion synchrotron SIS18. Measurements performed in 2001 showed that the beam lifetime of the ions in the synchrotron is decreasing with increasing number of injected particles due to vacuum instabilities caused by ion-induced desorption. The injection energy for the SIS18 is about 10MeVu and U28+ ions are accelerated to 200MeVu limited by the magnetic rigidity for the low charge state. The aim of this work was to measure the desorption yield as a function of the impact energy from injection to extraction of SIS18 at GSI. Low energy yields at 5.0, 9.7, and 17.7MeVu were measured at the Cyclotron of The Svedberg Laboratory in Uppsala. High energy yields at 40, 80, and 100MeVu were measured at SIS18 of GSI in a different setup. It was found that the desorption yield scales with the electronic energy loss (dEdx)eln, with n between 2 and 3, decreasing for increasing impact energy above the Bragg maximum.

2.
W.
Henning
,
Proceedings of the EPAC04
,
2004
(unpublished).
3.
H.
Kollmus
,
M.
Bender
,
M. C.
Bellachioma
,
E.
Mahner
,
A.
Krämer
,
L.
Westerberg
,
E.
Hedlund
,
O. B.
Malyshev
, and
H.
Reich-Sprenger
,
High Intensity and High Brightness Beams
, edited by
I.
Hofmann
,
J.-M.
Lagniel
, and
R. W.
Hasse
(
American Institute of Physics
,
New York
,
2005
), pp.
207
210
.
4.
E.
Hedlund
 et al,
Nucl. Instrum. Methods Phys. Res. A
586
,
377
(
2008
).
5.
H.
Kollmus
,
M.
Bender
,
W.
Assmann
,
A.
Krämer
,
M. C.
Bellachioma
, and
H.
Reich-Sprenger
,
Vacuum
82
,
402
(
2007
).
6.
M.
Bender
,
H.
Kollmus
, and
W.
Assmann
,
Nucl. Instrum. Methods Phys. Res. B
256
,
387
(
2007
).
7.
Tech-X Corporation
, www.txcorp.com
8.
F.
Grüner
,
W.
Assmann
, and
M.
Schubert
,
Phys. Rev. Lett.
93
,
213201
(
2004
).
9.
E.
Mahner
,
J.
Hansen
,
J.-M.
Laurent
, and
N.
Madsen
,
Phys. Rev. ST Accel. Beams
6
,
013201
(
2003
).
10.
A. W.
Molvik
 et al,
Phys. Rev. Lett.
98
,
064801
(
2007
).
11.
K.
Wien
,
Radiat. Eff. Defects Solids
109
,
137
(
1989
).
12.
V. P.
Shevelko
,
K.
Noda
,
Y.
Sato
,
H.
Tawara
, and
I. Yu.
Tolstikhina
,
Nucl. Instrum. Methods Phys. Res. B
211
,
460
(
2003
).
13.
R. D.
DuBois
 et al,
Phys. Rev. A
68
,
042701
(
2003
).
14.
C.
Omet
,
P.
Spiller
, and
H.
Kollmus
, GSI Scientific Report No. 2006,
2007
.
You do not currently have access to this content.