ELECTRON BEAM EXTRACTION ON PLASMA CATHODE ELECTRON SOURCES SYSTEM. The electron beam extraction through window of Plasma Generator Chamber (PGC) for Pulsed Electron Irradiator (PEI) device and simulation of plasma potential has been studied. Plasma electron beam is extracted to acceleration region for enlarging their power by the external accelerating high voltage (Vext) and then it is passed foil window of the PEI for being irradiated to any target (atmospheric pressure). Electron beam extraction from plasma surface must be able to overcome potential barrier at the extraction window region which is shown by estimate simulation (Opera program) based on data of plasma surface potential of 150 V with Ueks values are varied by 150 kV, 175 kV and 200 kV respectively. PGC is made of 304 stainless steel with cylindrical shape in 30 cm of diameter, 90 cm length, electrons extraction window as many as 975 holes on the area of (15 65) cm 2 with extraction hole cell in 0.3 mm of radius each other, an cylindrical shape IEP chamber is made of 304 stainless steel in 70 cm diameter and 30 cm length. The research result shown that the acquisition of electron beam extraction current depends on plasma parameters (electron density ne, temperature Te), accelerating high voltage Vext, the value of discharge parameter G, anode area Sa, electron extraction window area Se and extraction efficiency value .
A simulation of ion beam extraction and beam formation process for 150 keV/2mA ion implantor using SIMION 8.1. has been done. This simulation is aimed to provide an overview of the influence of the geometry and the effect of the variation of the voltage of both extractor and the acceleration tube of the ion source of ion implantor on the trajectory, beam diameter and beam emittance. The simulation was carried by varying the amount of particles that went through the acclerating tube, varying the accelerating voltage, and the extraction voltage, from 50 to 3000 particles, from 30 kV to 150 kV, and from 1 kV to 10 kV respectively. The simulation results show that the ion extraction process and the ion beam formation at the ion source of ion implantor is very dependent on the geometry and the voltage of both electrode and the extractor on the device. The incorrect electrode geometry and voltage would cause the particle trajectory to be non-linear, while the angle of the beam would diverge too much. We’ve also found that the amount of simulated particle would affect the homogeneity of the cross section of the beam. The bigger the amount of the simulated particle, the more homogeneous and stable the beam becomes. Unfortunately, for 3000 particles the running process was very long and prone to errors. Therefore in this simulation, the amount of particles is set to 2000, which gave us a rather uniform beam cross section. The variation of extraction voltage 1 kV to 10 kV while keeping the accelerating voltage constant at 150 kV produced an increment of the diameter of the ion beam from 3.84 cm to 4.12 cm. The variation of accelerating voltage from 30 kV to 150 kV while keeping the extraction voltage constant at 10 kV caused the spot diameter of the ion beam to increase. The value of the spot diameter of the ion beam when the accelerating voltage is kept at 150 kV are 4.12 ± 0.05 cm and 4.05 ± 0.05 cm for y-axis and x-axis respectively.
To support the operational safety of Soebali 2.0 (Sophisticated electron beam accelerator launched by Indonesia version 2.0), laboratory room condition with clean and dustfree, low temperature and humidity was required, and also maintained its stability using Air Conditioner (AC). In this regard, it was conducted to estimate the calculation of air cooling loads as a reference in determining the technical specification of AC that will be installed in Soebali 2.0 laboratory. Estimation was conducted to determine the air cooling loads that arise related to the construction of the building and supporting equipment for Soebali 2.0, which generates heat as the air cooling loads. Based on the estimation result, the total cooling capacity of the air conditioning system was about 153.585 BTU/hours or 15 kW. It was used for cooling the Soebali 2.0 laboratory room with 900 m3 of volume along with the operational supporting equipment was about 20 °C and relative humidity was 50 %.
Experimental and theoretical analysis of heat transfer at Electron Beam Machine (EBM) Laboratory in Center for Accelerator Science and Technology, National Nuclear Energy Agency (BATAN) are required to understand the heat transfer phenomena. The BATAN’s EBM is a typical 300 kV/20 mA. The room where EBM is based has to be set up according to the laboratory standard to perform at an optimum level. This work aims to evaluate if the installed two air conditioners with a total cooling capacity 160,000 Btu/hr inside the laboratory are sufficient to reach a temperature of 20 °C and atmospheric relative humidity (RH) from 45% to 55%. The laboratory was stacked up with brick, tinted glass window, aluminum door, and rolling door with a total volume of 836 m3. The experiment was performed in cloudy weather for six days from 8:00 a.m. to 4:00 p.m. and the data of temperatures at each spot were taken every one hour. There were three conditions of this experiment, air conditioner running with laboratory lamps set to be off, air conditioner running with laboratory lamps set to be on, and air conditioner running with laboratory lamps set to be on and insulating 10.5 m2 rolling door with 50 mm Styrofoam respectively every two days. The result showed that for the first condition, the average temperature of laboratory and atmospheric relative humidity (RH) was 22.5 °C and 59%, respectively. In the second condition, the average temperature of laboratory and atmospheric relative humidity (RH) was 21.9 °C and 65% respectively, whereas, in the third condition, the average temperature of laboratory and atmospheric relative humidity (RH) were 19.9 °C and 49% respectively. This result indicates that adding thermal insulation such as Styrofoam inside the building helps the air conditioners to reach its targeted temperature and RH.
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