Электронно-струнные источники многозарядных ионов с

34
3, 2010
621.384.6
. E.
, E. .
E. M.
, E. E.
, . .
, .
.
, . .
, . .
,
-
,
(
).
500—1000
,
)
,
(
.
).
100—200
r16+, Fe24+
,
.
8
Au51+,
,
10
.
PACS: 41.75.-i; 52.50.-b
:
,
,
,
,
,
-
.
,
,
.
-
[1],
.
-
,
.
10
1
,
—
-
,
-
.
.
,
70—80 %
.
.
,
1/ 2
Q = 1013 IA LM/ EeV
,
L —
.
.
,
,
( );
(
.
eV
).
15
,
-
,
.
, . .
, . .
,
,
,
,
,
18
. E.,
E. .,
L=1 .
1994 .
.
.
.
(
.
)
-
[2, 3].
-
.
.
.
.
, 141980,
,
E-mail: [email protected]
I=1
—
( ); IA —
= 10
,
.,
.
.
, 6.
1
,
5
2—4
.
-
2009 .
E. E.,
.
.,
. .,
E. M.,
. .,
. ., 2010
35
3, 2010
.
,
(
)
,
.
.
,
Au79+
E,
.
105
-
Au69+
,
,
-
.
Au77+
104
Au51+
Au32+
,
103
.
102
.
Fe24+
,
Au51+,
100—200
[4, 5].
8
101
1018
r16+,
-
1019
1020
1021
1022
1023
j ,
. 1.
(
) [6—8],
,
.
N
/N
25—50
r16+
,
10
Fe24+,
.
.
-
.
r16+
[9, 10],
= 1,5
,
j (
Fe24+
. 1).
j
2010 .
c(
,
Bg = B/R =
; R = 20 —
-
B=3T—
-
100—200 A/c 2
1 .
8
.
).
1
,
.
-
,
,
,
.
2—3
[11].
-
.
,
-
( /d)
d—
5
,
rc = 0,5
—
= v/
;
,
;
H
—
=
,
H
1,5
(rc/d)
,
—
.
-
.
.
-
gun
gun
R1/2
20
.
-
36
3, 2010
J
2
2
Nosc,
2,5—3
Ar16+
-
= 4 2Nosc.
—
Fe24+; Us
,
,
-
,
E
2
—
.
:
,
0,5
2J + eUs
J
.
3—3,5
1.
,
-
[10]:
,
,
b
> a.
[10]
2
Ib0
10
k( E/E)
11
2 1010,
k (Ib0/e) (L/(v)
—
-
E/E
;
0,3.
10
Ne = (IeL/ve)(1/4 )
Ie 200
—
L = 1,2 —
Ne
2 10 ,
, . .
;
.
Nmax = (2U L/3e)/(1 + 2 ln(b/a))
b—
—
[11],
.
;
.
-
-
,
1012,
,
-
.
[12].
. 2.
J
30
2,5—3
-
25
, n0/nbo
.
.
20
15
10
5
0
"
0
0,2
0,4
0,6
0,8
-2"
-
1
dE/E
,
. .
“
” [2, 3].
. 2.
“
3/2”
E/E
0,3,
n0/nb = k = 11,3
-
[2, 3],
(“
. 3.
(
.
.
(
3/2”).
,
(
.
. 2)
.
E/E
J/(eUs + J)
0,3—0,4,
. 3, )
,
)
(
.
. 3, ,
I = 300 A
.
. 3,
1)
,
).
-
37
3, 2010
I = 50
A.
,
,
22
,
Q– = aB3
20
. 3, ,
-
2)
,
,
.
18
16
14
Q–,
.
(
10
E/E
8
0,3—0,4.
,
6
-
4
,
.
(
.
2
,
. 3, ,
12
0
0,0
1,0
2,0
3,0
4,0
5,0
-
7,0
T,
. 4.
,
"
.
6,0
2, 3).
3).
Ar16+
" [4, 5].
-2" [2, 3]
—"
Fe24+,
,
"
:
= 0,5
Fe [5]
.
24+
= 1,1
8
"
Ii = 200
,
Ar16+ [4] Ii = 200
. 3.
— I = 50
Q–
A; — I = 300
6
Q–
A; 1—3 —
-
.
Q– = B3 [2, 3] (
:
. 4).
. 5.
— Ar16+ ;
"
— Fe24+
-2":
. 5.
,
38
3, 2010
-
,
Q–
B2.
[13],
–
3
Q
B,
-
,
,
–
.
B ).
,
10 %
,
.
,
. 6.
0,3,
E/E
,
,
-
.
.
-
(
)
.
Au51+,
8
10
0,08
dN/dE
[14].
-
. 7,
0,10
8
0,06
100
[14].
0,04
-
. 7,
0,02
0,00
.
-
-
4
(Q
.
200
0
1
2
3
[14].
,
-
.
4
,
. 6.
10-12
,
.
-
.
Q+
(0,6—0,8)Q–.
,
Tc/Ti ,
Ti
I
1
Ie
1 2 ln b a
v
10
,
kIb0
100
—
;
0,6—0,8 —
;
5—
.
—
.
—
. 7.
:
(
;
0,7
: Tc = 150, 450, 550
q = 50,2)
650
39
3, 2010
(4,6 109
(1014
3
-
4+
).
),
4,9
.
-
—
(
11
).
6+
= 29
.
38 %
, 1014
-
.
ISOLDE
11
4.
18
5%
-
11
-
. 8, ),
.
1,7 1013
4+
,
17 %
.
10
)
14
1,5
Q+,
(
4.
.
1,1
2
20
11
(
1
.
20
4+
11
:
,
Q+ =
,
-
3
1
0,5
1
.
-
0
0
,
1
2
2
3
4
5
6
t,
,
,
11
4+
,
-
3
.
-
1
,
2
4
.
"
-2"
,
,
[15].
10
-
1014
-
10
—
.
.
4+
-
2
. 8, .
. 8.
:
2
1—
:
—
10 :
; 2 — Q; 3 — dQ/dt;
1 — H+; 2 — C5+; 3 — C4+; 4 —
-
10
90 %
3,5
109
.
,
.
,
HIMAC,
3,1
,
-
6,4
0,71
.
10 %
.
,
3+
-
40
11
3, 2010
4+
1010
.
4 109
1
.
.
-
,
=5
.
8
.
2003 .
-c
) [6].
(
6
-
4
4
,
,
2
112
-
106
108
110
–2
.
,
.
2
3
98
102 100
–2
–4
–6
96
–8
1
–4
25—50
,
–6
,
-
–8
.
,
,
.
,
-
,
. 9.
—
:
; —
:1—
;2—
;3—
4—
,
[9, 10]
.
-
,
[6],
"
. 9,
.
-
.
1" [9, 10]
,
73,8
.
5
;
,
,
—1
.
-
.
,
,
.
3
Ar16+
Fe24+
-
5
2
,
.
10
.
10
(
,
,
.
:
-
-
. 9, ,
. 1—4).
-
,
.
"
.
1"
.
,
5
,
,
4,2 ,
. 9, )
-
,
—
40 .
.
41
3, 2010
"
.
10
.
,
2
-
.
,
3454.
,
yi = 8
-
-3 ".
10 .
, ri = 2
[10].
6
,
= 0,05
= 0,15
,
r-n
-n
, ( i = vi/
,
i
=
i
ri2/4
ri yi/4 i
i
= 10 c —
).
,
i
=
=
-
25
,
,
20
r
5
.
"
[9, 10, 12].
1"
2010 .
-
.
-
1. Donets E. D. Physics and Technology of Ion Sources// Ed. by
I. G. Brown, Wiley & Sons, NY, 1989. — 245 .
2.
. .,
. .,
. .
;
. 2067784 ;
."
", 1996. — 27 .
3. Donets E. D. // J. of Phys.: Conf. Series. 2004. No. 2. P. 213.
4. Donets E. D. et al. Electron String Source of Highly Charged
Ions: Studies and First Test on a Synchrotron// EPAC 02.
5. Donets D. E. et al.// Rev. Sci. Instrum. 2004. No. 75. P. 1543.
6.
. .,
. .,
. .
//
. RU 2 205 467 ;
."
", 2003.
15.
7. Donets . D. et al.// Rev. Sci. Instrum. 2002. No. 73. P. 696.
8. Donets E. E. // J. of Phys.: Conf. Series 2. 2004. No. 97.
9. Donets E. E. et al.// EPAC08. 2008. No. 403.
10. Donets E. D. et al.// HIAT09. 2009. No. E2.
11. Donets E. D. et al.// Review of Scientific Instruments. 2000.
V. 71. No. 2. P. 887.
12.
. .
.//
. 2009. . 35. 1. . 1.
13.
. .,
. .
:
CCC .1984. . 1225420.
14. Donets D. E. et al.// Review of science instruments. 2009.
V. 80. P. 063304.
15. Donets E. D. et al.// HIAT09. 2009. No. E1.
Electron-string ion sources of highly charged ions with linear
and tubular geometry of string
D. E. Donets, E. D. Donets, E. E. Donets, V. . Drobin, V. V. Salnikov, E. M. Syresin,
. V. Shabunov, V. B. Shutov
Joint Institute for Nuclear Research, 6 J. Curie str., Dubna, Moscow Region, 141980, Russia
E-mail: [email protected]
Electron string ion sources proposed in JINR are used in several accelerator centers for production of highly charged ions including bare nuclei. In this source the electrons confined in a high
magnetic field perform about 100—1000 oscillations between electron gun and reflector. It led to
creation of the dense electron plasma (electron string) at a low current of the electrons emitted from
the cathode. As result, the dissipated electron power is decreased by 2—3 orders of magnitudes at
same electron density in the reflex ion source. Electron string ion sources was used for production
of Ar16+, Fe24+ and Au51+ ion beams at current of 100—200 mA in a pulse of about 8 ms. To increase
capacity of the ion trap a tubular geometry of the electron string was proposed in JINR which
should provide ion output on a level, approaching to 10 mA of Ar16+ ions in the pulse mode.
PACS: 41.75.-i; 52.50.-b
Keywords: highly charged ion, ion source, electron beam, cathode, electron string, plasma.
Bibliography — 15 references.
Received 18 November 2009