Heavy ion beam injectors for the plasma potential and electron temperature measurements
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2000
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| Цитувати: | Heavy ion beam injectors for the plasma potential and electron temperature measurements / I.S. Bondarenko, O.O. Chmyga, M.B. Dreval, S.M. Khrebtov, O.D. Komarov, O.S. Kozachok, L.I. Krupnik, J.C. Cabral, A. Malaquias, I.S. Nedzelskiy, C.F. Varandas // Вопросы атомной науки и техники. — 2000. — № 6. — С. 181-182. — Бібліогр.: 2 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-785442015-03-19T03:02:06Z Heavy ion beam injectors for the plasma potential and electron temperature measurements Bondarenko, I.S. Chmyga, O.O. Dreval, M.B. Khrebtov, S.M. Komarov, O.D. Kozachok, O.S. Krupnik, L.I. Cabral, J.C. Malaquias, A. Nedzelskiy, I.S. Varandas, C.F. Plasma diagnostics 2000 Article Heavy ion beam injectors for the plasma potential and electron temperature measurements / I.S. Bondarenko, O.O. Chmyga, M.B. Dreval, S.M. Khrebtov, O.D. Komarov, O.S. Kozachok, L.I. Krupnik, J.C. Cabral, A. Malaquias, I.S. Nedzelskiy, C.F. Varandas // Вопросы атомной науки и техники. — 2000. — № 6. — С. 181-182. — Бібліогр.: 2 назв. — англ. 1562-6016 http://dspace.nbuv.gov.ua/handle/123456789/78544 533.9 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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DSpace DC |
| language |
English |
| topic |
Plasma diagnostics Plasma diagnostics |
| spellingShingle |
Plasma diagnostics Plasma diagnostics Bondarenko, I.S. Chmyga, O.O. Dreval, M.B. Khrebtov, S.M. Komarov, O.D. Kozachok, O.S. Krupnik, L.I. Cabral, J.C. Malaquias, A. Nedzelskiy, I.S. Varandas, C.F. Heavy ion beam injectors for the plasma potential and electron temperature measurements Вопросы атомной науки и техники |
| format |
Article |
| author |
Bondarenko, I.S. Chmyga, O.O. Dreval, M.B. Khrebtov, S.M. Komarov, O.D. Kozachok, O.S. Krupnik, L.I. Cabral, J.C. Malaquias, A. Nedzelskiy, I.S. Varandas, C.F. |
| author_facet |
Bondarenko, I.S. Chmyga, O.O. Dreval, M.B. Khrebtov, S.M. Komarov, O.D. Kozachok, O.S. Krupnik, L.I. Cabral, J.C. Malaquias, A. Nedzelskiy, I.S. Varandas, C.F. |
| author_sort |
Bondarenko, I.S. |
| title |
Heavy ion beam injectors for the plasma potential and electron temperature measurements |
| title_short |
Heavy ion beam injectors for the plasma potential and electron temperature measurements |
| title_full |
Heavy ion beam injectors for the plasma potential and electron temperature measurements |
| title_fullStr |
Heavy ion beam injectors for the plasma potential and electron temperature measurements |
| title_full_unstemmed |
Heavy ion beam injectors for the plasma potential and electron temperature measurements |
| title_sort |
heavy ion beam injectors for the plasma potential and electron temperature measurements |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2000 |
| topic_facet |
Plasma diagnostics |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/78544 |
| citation_txt |
Heavy ion beam injectors for the plasma potential and electron temperature measurements / I.S. Bondarenko, O.O. Chmyga, M.B. Dreval, S.M. Khrebtov, O.D. Komarov, O.S. Kozachok, L.I. Krupnik, J.C. Cabral, A. Malaquias, I.S. Nedzelskiy, C.F. Varandas // Вопросы атомной науки и техники. — 2000. — № 6. — С. 181-182. — Бібліогр.: 2 назв. — англ. |
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Вопросы атомной науки и техники |
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| fulltext |
UDC 533.9
Problems of Atomic Science and Technology. 2000. № 6. Series: Plasma Physics (6). p. 181-182 181
HEAVY ION BEAM INJECTORS FOR THE PLASMA POTENTIAL AND
ELECTRON TEMPERATURE MEASUREMENTS
I.S. Bondarenko, O.O. Chmyga, M.B. Dreval, S.M. Khrebtov,
O.D. Komarov, O.S. Kozachok, L.I. Krupnik
Institute Of Plasma Physics, NSC “KIPT”, Kharkov, Ukraine
J.C. Cabral, A. Malaquias, I.S. Nedzelskiy, C.F. Varandas
EURATOM/IST, Centro de Fusao Nuclear, Lisboa, Portugal
Introduction
Heavy ion beam probing is an important diagnostic
to measure fusion plasma parameters – plasma potential
(ϕpl), density (ne), electron temperature profiles as well
as their fluctuation.
The local electron temperature measurements by
means of the heavy ion beams with different masses are
based on the difference of ionization cross-section
dependence on plasma electron temperature. These
measurements, in particular, were carried out on
ISTTOK by means of Xe+ and Hg+ ion beams [1].
Unfortunately this method did not allowed to lead ion
beams of different masses and energies through fusion
device plasma during the same pulse.
The first aim of the present work is to describe the
using of a shaping-focusing system for primary ion
beam [2]. This system includes quasipierce extracting
system, three-electrode focusing lens, an acceleration
tube and an active beam control system.
The second aim of this work is to propose the new
types of double beam ion injectors for electron
temperature measurements, based on elaborated shaping
– focusing system.
Experimental results and discussion
Up to now in the HIBP ISTTOK diagnostic complex
has been used an ion injector with plasma-arc ion source
(Xe+, Cs+, Hg+). An ion current on the exit of a three-
electrode ion source extracting system is about 200 –
300 µA with an angular divergence 36 mrad. A cross
section of ion beam in operation area (1300 mm from
ion source) has defined by some apertures situated
inside the injector. The secondary beam current to the
detector plates is about 1 – 10 nA, if the primary beam
current after apertures 1,5 µA [1]. This low level of a
current signal leads to well-known difficulties of the
secondary beam current detecting against a background
of plasma loading noise. The increasing of the
secondary beam current may be achieved by increasing
of ion source exit current or by means of applying a
focusing system.
A shaping – focusing system, based on a quasipierce
extracting system, three-electrode focusing lens, a 32
electrode acceleration tube and an active beam control
system was elaborated in IPP NSC KIPT and tested in
CFN/IST with two types of ion sources: solid-state Cs
thermo-ionic source and Xe plasma-arc ion source. This
system with the potential distribution is presented in
Fig.1.
I – quasipierce extracting gap
II – focusing electrode
III – flight space
IV – acceleration space with a distributed potential
Fig.1
The experimental optimization of these systems with
a SIMION 3D code assistance allowed to obtain the
following ion beam parameters:
Ibeam Ebeam Uex ∅ beam Pinj
Cs+ 16 µA 22 keV 3 kV 0,5/2 mm 2.10-6 Torr
Xe+ 40 µA 22 keV 3 kV 1,5/2 mm 10-5 Torr
The ion current / accelerating voltage dependences
for plasma ion source are represented in Fig. 2.
182
Fig.2
The design of the shaping-focusing system gives a
possibility to change the thermoionic source to plasma
ion source very easily in order to work with a broad
spectrum of ion species.
Only Chaild-Lengmour law limits the ion current
experimental value in bough extracting systems for
given extracting gap without ion current losses on the
focusing system electrodes.
For electron temperature measurements during the
same pulse it is necessary to have two ion beams with
different masses and energies along one trajectory. In
order to lead two ion beams with different masses along
one trajectory across the fusion device magnetic field it
is necessary to have same Larmor radiuses in each point
of the magnetic field:
21 ii ρρ =
where
i
ii
i zH
E
⋅
⋅
⋅=
µ
ρ 21002,1
Ei – beam energy, µI – ion mass, zi – ion charge, H -
fusion device magnetic field.
2
1
12
i
i
ii EE
µ
µ=
for Cs+ and Tl+ ion beams we have
Cs
Tl
Cs
CsTl EEE 65,0==
µ
µ
It is proposed two versions of double ion beam
injector – ion beams, produced by these injectors will
have different masses, energies and one trajectory in the
fusion device magnetic field.
Fig.3
The first version is based on combination of two
solid-state thermoionic emitters: a ring emitter and axial
one with shaping-focusing system. This version allows
carrying out local and simultaneous electron
temperature measurements along defined trajectory (see
Fig.3).
The second version is based on plasma-arc ion
source and a shaping–focusing system with modulating
power supply. This modulating power supply will give a
possibility to have different beam energy levels with
defined frequency, about 10 3– 104 Hz. In this system
ion beams may be transported along defined trajectory
several times during fusion device pulse.
Conclusion
This report represents two versions, which are very
different from the points of view of technology and
scientific realization. The first version has more difficult
technical realization, but may be used to measure an
electron temperature in each point and any time moment
of plasma discharge. The second version is easier in
technology realization, but in this case we can measure
the electron temperature in different time moments. The
time divergence of these measurements depends on
frequency of a beam energy modulation. Now on base
of these versions, the calculations and technical design
of two injector types for ISTTOK (Lisbon, Portugal) are
carried on in Institute of Plasma Physics (Kharkov,
Ukraine). Calculations of these versions were carried
out by means of SIMON 3D program. The beam
energies are about 22 keV for Cs+, Xe+ and 14,4 keV for
Tl+, Hg+. Calculations showed a possibility to obtain ion
beam current about of several dozen microamperes.
Referenses
1. J.A.C.Cabral, O.J.Hancock et al. Plasma Sources
Scienc. Technol., 3 (1994), p. 1-9.
2. I.S.Bondarenko, A.A.Chmyga et al. 3rd Europhysics
Workshop, Budapest, June 18-19, 2000, p.14.
Introduction
Fig.3
Conclusion
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