Published at : 25 Jan 2024
Volume : IJtech
Vol 15, No 1 (2024)
DOI : https://doi.org/10.14716/ijtech.v15i1.4406
Darsono | Research Center for Accelerator Technology, Research Organization of Nuclear Technique (ORTN)-National Research and Innovation Agency (BRIN), Puspitek Serpong 15310, Indonesia |
Taufik | Research Center for Accelerator Technology, Research Organization of Nuclear Technique (ORTN)-National Research and Innovation Agency (BRIN), Puspitek Serpong 15310, Indonesia |
Suprapto | Research Center for Accelerator Technology, Research Organization of Nuclear Technique (ORTN)-National Research and Innovation Agency (BRIN), Puspitek Serpong 15310, Indonesia |
Saefurrochman | Research Center for Accelerator Technology, Research Organization of Nuclear Technique (ORTN)-National Research and Innovation Agency (BRIN), Puspitek Serpong 15310, Indonesia |
Elin Nuraini | Research Center for Accelerator Technology, Research Organization of Nuclear Technique (ORTN)-National Research and Innovation Agency (BRIN), Puspitek Serpong 15310, Indonesia |
Sutadi | Research Center for Accelerator Technology, Research Organization of Nuclear Technique (ORTN)-National Research and Innovation Agency (BRIN), Puspitek Serpong 15310, Indonesia |
The technical challenge in constructing the
electron source (ES) lies in the joining of metal and ceramic tubes.
Furthermore, there is a lack of available technical comparison data for the
output performance between the diode and triode ES under the same experimental
conditions. The research aim is to describe a simple technique for constructing
the diode and triode ES for an electron beam machine (EBM) of 300 keV/20 mA,
and to investigate their output characteristics. The method used is to make a
flange for mounting the Tungsten filament, Pierce electrodes, and heat shield.
Two or three electrodes of the NEC (National Electric Corporation) accelerator
tube are removed before the flange is united into the NEC tube, becoming the
ES. The ES‘s are investigated in terms of their electron beam profiles and beam
current output for the variation of the extraction electrode voltage as well as
the focusing electrode voltage. The experimental results show that for the
triode ES, the focusing electrode voltage greatly affects the shape of the
electron beam profile up to 3 kV. However, for the diode ES, the shape of the
electron beam profile is slightly affected by the extraction electrode voltage.
The beam current output increases rapidly with the increase of the extraction
electrode voltage up to 2.5 kV. Above this voltage, the beam current slowly increases, and it
tends to reach saturation. The diode ES
provides a higher electron beam current output than the triode ES output, but
the triode ES provides a better shape of the electron beam profile. The
constructed ES can provide the electron beam current of 40 mA at the filament
current of 18 A.
Beam profile; Beam current; Diode and triode; Electron source; Extraction anode; NEC tube
The
Electron Beam Machine (EBM) is a type of electron accelerator technology that
has been widely utilized in industry as a tool for electron beam processing of
an object for various purposes. Prominent applications of EBM are the cross-linking of wire and cables (Seung-Tae et al., 2022), surface curing of
materials
One of the main components of the
EBM is the electron source (ES), which generates the electron beam. The use of
ES is not only for EBM but also for X-ray radiotherapy
Research Centre for Accelerator
Technology has been constructing the EBM for irradiation processing of the
natural rubber latex with the specification of 300 keV/20 mA. It needs the ES,
which can provide the electron beam current output of at least 30 mA with a
better beam diameter profile. Taufik and Darsono have carried out the
simulation of the diode ES by using two
NEC (National Electric Corporation) accelerator tubes for EBM latex using 3D OPERA software
The importance and novelty of
this research lie in the simplicity of the construction technique for the ES,
and notably, there has been no prior investigation comparing the technical data
of the output performance between diode and triode ES under the same
experimental conditions. These data are very important to choose the suitable
ES which will be used in the EBM of 300 keV/20 mA for irradiation processing of
the natural rubber latex. Therefore, the output performance of the diode and
triode ES is crucial to be investigated. This paper describes the construction
and characterization of the locally made ES by taking advantage of a general
accelerator tube of NEC. Two types of ES, namely the diode and the triode ES,
were constructed and investigated in this research. The two ES use the
electrode of Pierce type with the same specification, and they use the tungsten
filament of spiral shape with the same diameter. The purpose of this research
is to get the characteristic data of the ES output consisting of the electron
beam profile, and the beam intensity.
In the construction
of the ES, some important things that should be taken into account are the shape of the
filament, the electrode shape, the distance between electrodes, the hole of the
electrodes, and the materials used. The materials must meet the UHV (ultra-high
vacuum) standard, and mechanical work must use precise machinery. The ES
characterization uses the fluorescent detector to monitor a beam profile shape and uses the
Faraday Cup to measure the electron beam output.
2.1.
Construction of Electron Source
In this
work, the construction of the diode ES is based on the simulation result done by Taufik and Darsono (Taufik and Darsono, 2014). Meanwhile, the construction of the triode ES is based on the simulation
result conducted by Darsono et al.
Figure 1 The schematic structure
of the designed ES: (a) Diode ES; (b) Triode ES
Caption Figure 1(a): No. 1 is a flange, No. 2 is a
screw, No. 3 is UHV power feedthrough, No. 4 is a heat shield in the diode ES
and it is the focusing electrode in the triode ES, No. 5 is the cathode
electrode of Pierce type, No. 6 is a feedthrough for filament holder, No. 7 is
a tungsten filament
Figure 1(b):
No. 1 is a flange, No. 2 is a screw, No. 3 is UHV power feedthrough, No. 4 is a
heat shield in the diode ES and it is the focusing electrode in the triode ES,
No. 5 is the cathode electrode of Pierce type, No. 6 is a feedthrough for
filament holder, No. 7 is a tungsten filament, No. 8 is Alumina ring
The construction was started by making a flange of DN-160 CF that matched the NEC tube for mounting the Tungsten filament, the electrodes of Pierce type, and the heat shield. For the filament's power supply input, a UHV (Ultra-High Vacuum) power feedthrough was employed to provide insulation between the anode and cathode of the tungsten filament. For the triode ES, the focusing anode electrode was inserted between the cathode electrode and the extraction anode electrode. The focusing anode should be designed so that it is in contact with the first metal ring of the NEC tube in the incident direction of the electron beam. Moreover, the focusing anode was insulated with the flange of the NEC tube using the Alumina ring. All components of the ES were made in our mechanical workshop. After completing the construction of the ES components, they were assembled into the flange of DN-160 CF. Then, this flange was mounted on the NEC accelerator tube to become an ES.
Table 1 Parameter design of the ES
No |
Paramater |
Diode ES |
Triode ES | |
|
|
Spesification | ||
1 |
Filament |
Tungsten
Materials, wire diameter of 0.5 mm, spiral
shape of 12 mm diameter |
Tungsten
Materials, wire diameter of 0.5 mm spiral
shape of 12 mm diameter | |
2 |
Cathode
electrode |
Pierce
type with an opening diameter of 25 mm |
Pierce
type with an opening diameter of 25 mm | |
3 |
Focusing
anode |
None |
Modified
heat shield of diode ES. The electrode of
Pierce type with a hole diameter of 20 mm.
Alumina ring between the flange and focusing anode | |
4 |
Extraction
anode |
As the
electrode shape of the NEC accelerator tube |
As the
electrode shape of the NEC accelerator tube | |
5 |
Distance filament
to focusing anode |
None |
10 mm | |
6 |
Distance
filament to extraction anode |
38 mm |
38 mm | |
7 |
Distance
between the electrode of the NEC accelerator tube |
19 mm |
19 mm | |
8 |
ES Flange |
DN-160 CF |
DN-160 CF | |
9 |
Heat
shield |
Cylinder
shape |
Cylinder
shape | |
The construction was started by making a flange of DN-160
CF that matched the NEC tube for mounting the Tungsten filament, the electrodes of Pierce type, and the heat shield. For the
filament's power supply input, a UHV (Ultra-High Vacuum) power feedthrough was
employed to provide insulation between the anode and cathode of the tungsten
filament. For the triode ES, the focusing anode electrode was inserted between
the cathode electrode and the extraction anode
electrode. The focusing anode should be designed so that it is in contact with the first
metal ring of the NEC tube in the incident
direction of the electron beam. Moreover, the focusing anode was insulated with the flange of the
NEC tube using the Alumina ring. All components of the ES were made in our mechanical workshop. After completing the construction of the ES components, they were
assembled into the flange of DN-160 CF. Then, this flange was mounted on the NEC
accelerator tube to become an ES.
2.2. Characterization
The
constructed ES was characterized in terms of the electron beam profiles and beam current
output. The schematic for the measurement of the beam profile is shown in Figure 2. The beam profile
measurements used the method as described by Darsono et al.
Figure 2 A schematic of the beam profile measurement
of the ES
Figure 3
shows the experimental setup to measure the electron beam current output of the
diode and triode ES. The beam current was measured using a water-cooled Faraday Cup. The
power supply (PS) of the filament was locally made with the specification of 20
V-DC/25 A. Two regulated high voltages were used for the focusing anode voltage
of 10 kV-DC and for the extraction anode voltage of 30 kV-DC. In the case of
the diode ES, there are 8 electrodes used in the NEC tube, meanwhile, in the
case of the triode ES, there are 7 electrodes used. Both measurements were
carried out at the same experimental condition.
Figure 3 A schematic of the measurement of the beam current output of the ES: (a)
Diode ES; (b) Triode ES
3.1. Construction
of Electron Sources
Figures 4a and 4b show the construction results of the
flange for the diode ES and the triode ES, where Figure 4c
shows the NEC accelerator tube used. The white color observed
on the top of the flange, as depicted in Figure 4b, represents an Alumina ring.
This ring has been specifically designed to withstand the high voltage of 20
kV. On top of
the Alumina ring is the focusing anode electrode. The cathode electrode of the
triode ES is placed inside the tube of the focusing anode. The cathode
electrode of the Pierce type can be seen in Figure 4a, located on the inner
side of the heat shield.
Figure 4 The model of the diode and triode ES and its
NEC accelerator tube: (a) The flange of diode ES; (b) The flange of triode ES;
(c) The NEC accelerator tube
3.2. Characterisation
of Electron Sources
Table 2 is the measurement result of the electron beam profile using the phosphorescent TV
screen. The photograph image of the shape of the electron beam profile was
taken in the same experimental condition for both the diode and the triode ES. The experimental vacuum condition was 3 × 10-6
Torr, and the filament current was 14 A. At this filament current value and
fixed extraction voltage, the
electron beam current in the phosphorescent TV screen ranged from 28 µA to 50 µA depending on the magnitude value
of the focusing.
From Table 2, it can be said that the shape and the brightness intensity
of the electron beam profile are
influenced by the focusing and extraction anode voltages. At a
constant extraction anode voltage, it is observed that increasing the focusing
anode voltage results in improved beam profiles, indicating a more favorable
shape. This case is due to the potential
difference between the focusing anode and the heated filament,
which forces more electrons to emit from near the filament
surface. While at
fixed focusing anode voltage, the greater the extraction anode voltage is, the brighter the intensity of the electron
beam profile would be.
Tabel 2 The beam profile shape of the triode ES output
The
theoretical explanation of this experimental result is the following. When the filament is heated then the electron cloud
will form in front of the cathode. The applied voltage on the focusing anode will attract the electron
cloud from near the surface of the hot
filament. Moreover, the electron cloud can also change the
configuration of the electric field so that the electron emission from the
filament surface is limited. The magnitude of this electric field depends on
the focusing anode voltage due to the distance of the focusing anode electrode to the cathode electrode is kept constant. In order
for the electron beam to be removed or extracted from the ES chamber, a strong
electric field is required in the direction from the focusing anode to the cathode
(filament). In the
triode ES, the
configuration of three electrodes
functions as the Einzel lens. For a constant extraction anode voltage, therefore, the shape of the electron beam
profile is determined by the focusing anode voltage.
Furthermore, from Table 2, it can be seen that for extraction anode voltage higher than 0.5
keV, increasing the
focusing anode voltage higher than 3 kV it is no longer affects the
shape of the electron
beam profile. However, it affects the brightness intensity of the electron beam
shape. It is presumed that when the focusing anode voltage exceeds 3 kV,
the electron cloud is unable to alter the configuration of the electric field,
resulting in a consistent beam shape. In this condition, all electron clouds in the ES chamber are directed
to the acceleration tube by focusing anode voltage; therefore, the brightness
intensity increases. It can be summed that the focusing anode
voltage functions to control the beam profile. This experimental result is in
accordance with the experimental results which are reported by Deore et al.
The comparison of the shape of the beam profiles between the
triode and diode ES as function of the extraction anode voltage is shown in Table 3. In this comparison,
the triode ES is operated on the focusing anode voltage of 3 kV. It can be
seen that the shape of the beam profile of the triode ES is better than that of
the diode ES. From Table 3 also indicates that with an increase in extraction anode
voltage, there is a corresponding enhancement in the brightness intensity of
the electron beam profile. In simpler terms, higher extraction anode voltages
result in a greater extraction of electron beam charges.
The investigation results of the electron beam current output for both diode and triode ES as a function of the
extraction electrode voltages for various filament currents (If) are
shown in Figure 5. As a note in Figure 5 D-ES represents the diode ES, and T-ES
represents the triode ES. In these experiments, the data of the electron beam
current output were taken in the same values of the filament current ranging from 15 A up to 18 A and also in the same vacuum
condition. The magnitude
value of the initial vacuum condition at off filament current was 3 × 10-6
Torr, then this vacuum decreased with increasing the magnitude value of
the filament
current.
Tabel 3 The beam profile shape of the
diode and triode ES
The
investigation results of the electron beam current output for both diode and triode ES as a function of the
extraction electrode voltages for various filament currents (If) are
shown in Figure 5. As a note in Figure 5 D-ES represents the diode ES, and T-ES
represents the triode ES. In these experiments, the data of the electron beam
current output were taken in the same values of the filament current ranging from 15 A up to 18 A and also in the same vacuum
condition. The magnitude
value of the initial vacuum condition at off filament current was 3 × 10-6
Torr, then this vacuum decreased with increasing the magnitude value of
the filament
current.
From Figure 5, when the extraction anode voltages are increased,
then the electron beam current outputs of both ES’s also increase to a certain extent, and after
that, it tends to be saturated
at the extraction
anode voltage higher than 2.5 kV.
These experimental results are in agreement with similar previous studies, which show the same curve pattern of the
beam current output of the ES as a function of the extraction anode
voltage
El-Saftawy et al. have investigated the extraction beam characteristics and beam diagnosis for a
Pierce-type of diode electron gun with a spherical anode to acquire an electron beam
suitable for different applications
Figure 5 The effect of the anode
extraction voltage on the output of the
ES
Moreover, from Figure 5, it can
be seen that at a fixed extraction anode voltage, the variation of the filament
currents changes the magnitude value of the saturation electron beam current.
In other word, at constant electrode anode voltage, the saturation electron
beam current increases when the filament current increases. As
predicted, in this case, the current density of the saturated electron
emission, derived from the energized filament within the ES chamber, aligns
with the Richardson-Dushman equation. His equation states that the magnitude of the electron
cloud emitted from the filament is proportional to the square of the filament
temperature, whereas the filament temperature is proportional to the increasing
filament current. Our experimental results are also in agreement with
similar previous investigations carried out by Deore et al.
A more detailed examination of
Figure 5 reveals that the saturation electron beam current of the triode ES is
approximately 10% lower than that of the diode ES. These differences might be
due to the hole diameter of the
focusing anode electrode of the triode ES being smaller than that of the diode
ES, as depicted in Table 1. The highest electron beam current output, which can be achieved in
our experiment, is 40 mA. The magnitude of the resulting electron beam current
meets the specification of the ES of the EBM for irradiation processing of natural rubber latex.
Mostly, the focusing and
extraction anodes are one part of the ES and are separated from the accelerator
tube. However, manufacturing the ES, including the focusing and extraction
anodes inside, requires an advanced technology called the vacuum brazing
technique for joining the metal anode and a ceramic as an insulation material
that can hold several kV anode voltage differences. The metal and ceramic
joints also have to be able to withstand high vacuum. Therefore, the cost of
manufacturing that kind of ES becomes expensive. Meanwhile, in our design, one
or two acceleration electrodes of the electrostatic accelerator tube that have
been separated by ceramic insulation are modified to focusing and extraction
anodes. Therefore, no vacuum brazing process is required, and the cost of
manufacturing ES becomes much cheaper. Nevertheless, our ES can be used to
reduce the cost of the EBM for the electrostatic acceleration type only, which
is widely used in industrial applications and in
life and materials sciences
Moreover, the electron source
that has been successfully constructed uses a new and simple production
technique of the ES, namely by making a special flange as a main mechanical
component of ES shown in Figure 1. For the diode ES, this flange is loaded with
a power feedthrough that functions as a tungsten filament holder, a pierce
cathode electrode and a heat shield. For the triode ES, the flange is loaded
with a power feedthrough that functions as a tungsten filament holder, the
pierce cathode electrode and the modified heat shield function as focusing
controlled electrodes, plus an alumina ring to insulate the voltage on the
pierce cathode electrode and the focusing controlled electrode. Meanwhile, the
extractor electrode voltage utilizes an electrode on the accelerator tube.
The advantage of this ES’s
production technique is that the dimensions of the special flange of the ES can
be adjusted accordingly to that of the accelerator tube to be used in the
electron beam machine. The ES’s production can be done anywhere with a cheap
production cost as long as there is a machinery workshop. The market price of
the electron source is around 26,300 USD
Two types of ES have been
successfully constructed and characterized. The diode ES provides a slightly
higher output of the electron beam current compared with the triode ES output,
but the triode ES provides a better shape of the electron beam profile. The shape of the electron beam profile is predominantly determined by the focusing
anode voltage. The focusing electrode voltage from 0
kV up to 3 kV affects the shape of the electron beam profile. The greater the filament current is, the greater the electron
beam current output of the two ES would be. The magnitude of the electron beam current
output is greatly determined by the extraction electrode voltage and the
filament current, where the largest yield is 40 mA. For the two types of ES investigated, the experimental
results show that the beam current output increases rapidly with the increase of the extraction electrode voltage up to 2.5 kV,
but above this voltage, it tends to be saturated. The constructed ES meets the specifications required for EBM
latex. The production technique of the ES is very simple with low-cost
production, and the ES is easy to maintain.
The authors extend their
gratitude to the Head of the Research Center for Accelerator Technology for
providing IDR 200M of the 2020-2021 R&D budget essential for
conducting this research. Special thanks also go to our technicians, Mr.
Suhartono, Mr. Sukidi, and Mr. Sumaryadi, for their invaluable assistance in
completing this study.
Filename | Description |
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R1-EECE-4406-20230727095116.jpg | Revision Figure 3.a |
R1-EECE-4406-20230727095145.jpg | Revision Figure 3.b |
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