The prototype of radioactive ion source
The design and experimental results of the RIB source prototype are presented. A source will have the container of ²³⁵U compounds heated up to 2200-2500°C. Vapors of uranium fission obtained when the ion source is irradiated by the high-energy neutron flux, are then ionized and extracted from the so...
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| Опубліковано в: : | Вопросы атомной науки и техники |
|---|---|
| Дата: | 2001 |
| Автори: | , , , , , , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/79272 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | The prototype of radioactive ion source / A.V. Aleksandrov, A. Andrighetto, P.A. Bak, N.Kh. Kot, P.V. Logatchev, S.V. Shiyankov, L. Stroe, L. Tecchio // Вопросы атомной науки и техники. — 2001. — № 3. — С. 189-190. — Бібліогр.: 1 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859496681647636480 |
|---|---|
| author | Aleksandrov, A.V. Andrighetto, A. Bak, P.A. Kot, N.Kh. Logatchev, P.V. Shiyankov, S.V. Stroe, L. Tecchio, L. |
| author_facet | Aleksandrov, A.V. Andrighetto, A. Bak, P.A. Kot, N.Kh. Logatchev, P.V. Shiyankov, S.V. Stroe, L. Tecchio, L. |
| citation_txt | The prototype of radioactive ion source / A.V. Aleksandrov, A. Andrighetto, P.A. Bak, N.Kh. Kot, P.V. Logatchev, S.V. Shiyankov, L. Stroe, L. Tecchio // Вопросы атомной науки и техники. — 2001. — № 3. — С. 189-190. — Бібліогр.: 1 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | The design and experimental results of the RIB source prototype are presented. A source will have the container of ²³⁵U compounds heated up to 2200-2500°C. Vapors of uranium fission obtained when the ion source is irradiated by the high-energy neutron flux, are then ionized and extracted from the source. In the experiments with the prototype loaded by ¹²C the source working temperature 2700°C was reached, the carbon ion current 10 nA was obtained. The total operation time of more than 100 hours with no performance degradation was demonstrated.
|
| first_indexed | 2025-11-24T23:24:19Z |
| format | Article |
| fulltext |
THE PROTOTYPE OF RADIOACTIVE ION SOURCE
A.V. Aleksandrov1, A. Andrighetto2, P.A. Bak1, N.Kh. Kot1,
P.V. Logatchev1, S.V. Shiyankov1, L. Stroe2, L. Tecchio2
1Budker Institute of Nuclear of Physics,
11, Ac. Lavrentiev Ave, Novosibirsk, 630090, Russia
2Laboratori Nazionali di Legnaro, Istituto Nazionale di Fisica Nucleare (LNL INFN),
Via Romea 4 35020 Legnaro (Padova) Italy
The design and experimental results of the RIB source prototype are presented. A source will have the container of
235U compounds heated up to 2200-25000C. Vapors of uranium fission obtained when the ion source is irradiated by
the high-energy neutron flux, are then ionized and extracted from the source. In the experiments with the prototype
loaded by 12C the source working temperature 27000C was reached, the carbon ion current 10 nA was obtained. The
total operation time of more than 100 hours with no performance degradation was demonstrated.
PACS numbers: 29.25.Rm
1 INTRODUCTION
The radioactive ion source (RIS) which is under de-
velopment for SPES project [1] will consist of the con-
tainer made of heat-resistant material (Ta, W), filled by
disks made of 235U compounds 1 mm in thickness. The
container heated up to the temperature 25000 C is irradi-
ated by the neutron flux 1010 sec-1∙cm-2. When neutrons
interact with 235U, the radioactive ions of various masses
are produced. Ions being diffused towards the disk sur-
face are evaporated into the container's free vacuum
space.
Fig. 1. Picture of ion source prototype (side view).
The produced vapor which contains radioactive ions
gets thermally ionized on the internal walls of a contain-
er. The flux of a mix of atoms and ions of radioactive
elements is directed to the accelerating space via the
container's emission hole, where then accelerated up to
20 keV/u.
To verify the possibility of RIS production the pro-
totype (Fig. 1, 2) with graphite as a working agent was
developed and tested. During the experiments on a pro-
totype the reliability of the selected design was con-
firmed, the evaluation of power consumption required to
maintain a given temperature inside the prototype was
done as well as the study of vacuum conditions re-
quired.
Fig. 2. Picture of ion source prototype (rear view).
2 PROTOTYPE DESCRIPTION
The prototype of RIS consists of tantalum container
(7, see Fig. 3) 20 mm in diameter and 30 mm in length,
which is positioned on the tungsten holder 4mm in di-
ameter. Graphite is placed inside the container. The con-
tainer is surrounded by 5 thermal screens (5) made of
sheet tantalum 0.1 mm in thickness. To reduce the ther-
mal flux from the high temperature volume, additional
thermal screens are set on the technological apertures
(10). One of the container wall has the emission hole 0.5
mm in diameter. Between the external cylindrical sur-
face of the container and the internal cylindrical surface
of the thermal screen, the cathode (3) is placed.
It is made of tungsten 1 mm in diameter and 280 mm
in length. To provide the cathode stability at high tem-
perature, the cathode holders are performed as three par-
allel tungsten rods, each 1 mm in diameter. One of them
acts as the extension of the cathode wire, and all of them
are joined by the tungsten bands performed as 0.25 mm
wire. It reduces the operational temperature and increas-
es the hardness of cathode holders. For cathode heating
up to the electron emission temperature, the power sup-
ply of 700 - 800 W is used. The container is electrically
insulated from a thermal screen and could be shifted up
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №3.
Серия: Ядерно-физические исследования (38), с. 189-190.
189
to 500 V. While heating the thermal screen internal sur-
faces, they also emit electrons to the container. Upon
the achievement of the container's steady-state tempera-
ture 25000C, the total power consumption in the source
reaches 1750 W. The external surface of the thermal
screen is around 125 cm2, so ensures the heat flux
around 140 W/cm2.
Fig. 3. Ion source prototype schematic view. 1 - iso-
lation transformer; 2 - direct current supply; 3 -
cathode holder; 4 - container holder; 5 - thermal
screens; 6 - cathode; 7 - container with graphite;
8 - emission hole; 9 - anode; 10 - additional thermal
screen; 11 - cathode heater; 12 - accelerating volt-
age source.
The anode (9) is positioned at a distance of 10 mm
from a thermal screen coaxial with the emission hole.
The voltage between the anode and the source is 20 kV.
The prototype of the RIS is mounted on the metal flange
welded with the butt-end of the ceramic vacuum pipe,
and placed into the cooling vacuum chamber under a
pressure around 10-5 Torr. The body of a RIS prototype
has a potential of +20 kV relative to the ground, so the
isolation transformer is used for power supply.
3 EXPERIMENTS WITH PROTOTYPE
When the prototype was tested, the working agent
inside the container was graphite due to the appropriate
level of its vapor pressure at the required temperature
(~ 25000C). The container temperature around the emis-
sion hole was measured by the pirometer, taking into ac-
count the thermal radiation ratio for tantalum εTa= 0.29.
Temperature measured by the pirometer was Tp=2050K,
and temperature of the container was calculated as:
K
T
T
Ta
p
c 2820
4
==
ε
.
This temperature measurement was confirmed by the
carbon vapor pressure in the jet that flew out from the
emission hole. In three hours at temperature 2050K the
carbon layer 0.05 mm in thickness was formed on the
anode surface. It defined the pressure value in the car-
bon vapor jet ~ 5∙10-2 Torr, and graphite temperature at
this vapor pressure was 2800K.
The obtained ion current was then studied in the
magnetic spectrometer. Fig. 4 shows the dependence of
the ion current on the atomic mass and the power fed
the container. The prototype stood around 100 hours
with no performance degradation, then electric break-
downs were detected on the ceramic insulators. After in-
sulators were cleaned, breakdowns were stopped.
Fig. 4. Ion current vs. atomic mass for various contain-
er's power supplies.
4 CONCLUSION
To increase the prototype lifetime without break-
down, the vacuum condition improvement is required,
and protection screens should be set before ceramic sur-
faces to reduce the spraying.
The prototype of the ion source with the vacuum
chamber was manufactured at BINP, Novosibirsk, and
then tested in LNL INFN, Legnaro. During the upcom-
ing series of experiments it is planned to test the proto-
type with uranium carbide as an operational substance.
REFERENCES
1. LNL-INFN (REP) 145/99, June 1999.
190
|
| id | nasplib_isofts_kiev_ua-123456789-79272 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-11-24T23:24:19Z |
| publishDate | 2001 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Aleksandrov, A.V. Andrighetto, A. Bak, P.A. Kot, N.Kh. Logatchev, P.V. Shiyankov, S.V. Stroe, L. Tecchio, L. 2015-03-30T08:50:24Z 2015-03-30T08:50:24Z 2001 The prototype of radioactive ion source / A.V. Aleksandrov, A. Andrighetto, P.A. Bak, N.Kh. Kot, P.V. Logatchev, S.V. Shiyankov, L. Stroe, L. Tecchio // Вопросы атомной науки и техники. — 2001. — № 3. — С. 189-190. — Бібліогр.: 1 назв. — англ. 1562-6016 PACS numbers: 29.25.Rm https://nasplib.isofts.kiev.ua/handle/123456789/79272 The design and experimental results of the RIB source prototype are presented. A source will have the container of ²³⁵U compounds heated up to 2200-2500°C. Vapors of uranium fission obtained when the ion source is irradiated by the high-energy neutron flux, are then ionized and extracted from the source. In the experiments with the prototype loaded by ¹²C the source working temperature 2700°C was reached, the carbon ion current 10 nA was obtained. The total operation time of more than 100 hours with no performance degradation was demonstrated. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники The prototype of radioactive ion source Прототип источника радиоактивных ионных пучков Article published earlier |
| spellingShingle | The prototype of radioactive ion source Aleksandrov, A.V. Andrighetto, A. Bak, P.A. Kot, N.Kh. Logatchev, P.V. Shiyankov, S.V. Stroe, L. Tecchio, L. |
| title | The prototype of radioactive ion source |
| title_alt | Прототип источника радиоактивных ионных пучков |
| title_full | The prototype of radioactive ion source |
| title_fullStr | The prototype of radioactive ion source |
| title_full_unstemmed | The prototype of radioactive ion source |
| title_short | The prototype of radioactive ion source |
| title_sort | prototype of radioactive ion source |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/79272 |
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