The evolution of the charge state distribution inside an electron beam ion source or trap (EBIS/T) is determined by interactions of the electron beam with the ions in the trap region. Hence, detailed information about the electron beam is required for evaluations of spectroscopic and ion extraction measurements performed at EBIS/T facilities. This article presents the results of investigations on the electron beam properties of an ion source of the Dresden EBIS type. For the first time theoretical predictions of the shape of the beam were tested for a noncryogenic EBIS working with low magnetic flux densities provided by permanent magnets. Position and width of the electron beam were measured at different electron energies showing an oscillation in the beam structure. At an energy of Ee=16keV and an emission current of Ie=30mA the beam is compressed to a radius of re=57μm (80% current). This refers to an average current density of je=232A/cm2.

1.
2.
P.
Beiersdorfer
,
H.
Chen
,
D. B.
Thorn
, and
E.
Träbert
,
Phys. Rev. Lett.
95
,
233003
(
2005
).
3.
H.
Bruhns
,
J.
Braun
,
K.
Kubicek
,
J. R.
Crespo López-Urrutia
, and
J.
Ullrich
,
Phys. Rev. Lett.
99
,
113001
(
2007
).
4.
P.
Beiersdorfer
,
R. E.
Olson
,
G. V.
Brown
,
H.
Chen
,
C. L.
Harris
,
P. A.
Neill
,
L.
Schweikhard
,
S. B.
Utter
, and
K.
Widmann
,
Phys. Rev. Lett.
85
,
5090
(
2000
).
5.
P.
Beiersdorfer
,
K. R.
Boyce
,
G. V.
Brown
,
H.
Chen
,
S. M.
Kahn
,
R. L.
Kelley
,
M.
May
,
R. E.
Olson
,
F. S.
Porter
,
C. K.
Stahle
, and
W. A.
Tillotson
,
Science
300
,
1558
(
2003
).
6.
G.
Hayderer
,
S.
Cernusca
,
M.
Schmid
,
P.
Varga
,
H. P.
Winter
,
F.
Aumayr
,
D.
Niemann
,
V.
Hoffmann
,
N.
Stolterfoht
,
C.
Lemell
,
L.
Wirtz
, and
J.
Burgdörfer
,
Phys. Rev. Lett.
86
,
3530
(
2001
).
7.
T.
Schenkel
,
A.
Persaud
,
A.
Kraemer
,
J. W.
McDonald
,
J. P.
Holder
,
A. V.
Hamza
, and
D. H.
Schneider
,
Rev. Sci. Instrum.
73
,
663
(
2002
).
8.
F.
Ullmann
,
F.
Grossmann
,
V. P.
Ovsyannikov
,
J.
Gierak
, and
G.
Zschornack
,
Appl. Phys. Lett.
90
,
083112
(
2007
).
9.
D.
Schulz-Ertner
,
A.
Nikoghosyan
,
C.
Thilmann
,
T.
Haberer
,
O.
Jäkel
,
C.
Karger
,
G.
Kraft
,
M.
Wannenmacher
, and
J.
Debus
,
Int. J. Radiat. Oncol., Biol., Phys.
58
,
631
(
2004
).
10.
G.
Herrmann
,
J. Appl. Phys.
29
,
127
(
1958
).
11.
H.
Kuramoto
,
T.
Kinugawa
,
H.
Watanabe
,
C.
Yamada
,
S.
Ohtani
,
I.
Yamada
, and
F. J.
Currell
,
Rev. Sci. Instrum.
73
,
42
(
2002
).
12.
I. V.
Alyamovsky
,
Electron Beams and Electron Guns
(
Sovetskoe Radio
,
Moscow
,
1966
), p.
417
.
13.
M. A.
Levine
,
J. N.
Marrs
,
J. N.
Bardsley
,
P.
Beiersdorfer
,
C. L.
Bennett
,
M. H.
Chen
,
T.
Cowan
,
D.
Dietrich
,
J. R.
Henderson
,
D. A.
Knapp
,
A.
Osterheld
,
B. M.
Penetrante
,
M. B.
Schneider
, and
J. H.
Schofield
,
Nucl. Instrum. Methods Phys. Res. B
43
,
431
(
1989
).
14.
D. A.
Knapp
,
R. E.
Marrs
,
S. R.
Elliot
,
E. W.
Magee
, and
R.
Zasadzinski
,
Nucl. Instrum. Methods Phys. Res. A
334
,
305
(
1993
).
15.
S. B.
Utter
,
P.
Beiersdorfer
,
J. R.
Crespo López-Urrutia
, and
K.
Widmann
,
Nucl. Instrum. Methods Phys. Res. A
428
,
276
(
1999
).
16.
G.
Zschornack
,
S.
Landgraf
,
F.
Grossmann
,
U.
Kentsch
,
V. P.
Ovsyannikov
,
M.
Schmidt
, and
F.
Ullmann
,
Nucl. Instrum. Methods Phys. Res. B
235
,
514
(
2005
).
17.
See http://www.dreebit.com for further information.
18.
F. J.
Currell
,
J.
Asada
,
K.
Ishii
,
A.
Minoh
,
K.
Motohashi
,
N.
Nakamura
,
K.
Nishizawa
,
S.
Ohtani
,
K.
Okazaki
,
M.
Sakurai
,
H.
Shiraishi
,
S.
Tsurubuchi
, and
H.
Watanabe
,
J. Phys. Soc. Jpn.
65
,
3186
(
1996
).
19.
J. R.
Crespo López-Urrutia
,
B.
Bapat
,
I.
Draganic
,
A.
Werdich
, and
J.
Ullrich
,
Phys. Scr., T
92
,
110
(
2001
).
You do not currently have access to this content.