Development of Electron Source Filament Current Data Acquisition System on EBM Arjuna 1.0

The electron source is one of the very important devices in an Electron Beam Machine (EBM) Arjuna 1.0. The electron source serves as an electron beam generator by producing electron source filament current. Currently, to observe the current of electron source filaments an indirect data acquisition system has been created. A potentiometer is coupled with a filament current power supply regulator motor; the potentiometer voltage generated when the motor is driven to regulate the power supply of the filament current is then calibrated so as to produce the value of the electron source filament current indirectly. The measurement values of the system are then processed and displayed into a 7-segment digital display on the control table. In this study, a system was designed to measure and digitalize the filament current of the electron source through the previous indirect measurement. To carry out the plan, Adam 4017+, Adam 4520, LabView software, and MySQL databases were used. The obtained electron source filament current data will be displayed with the LabView program and stored in the MySQL database. The results of the analysis of the display value of the electron source filament current compared with the measurement of standard measuring instruments resulted in an accuracy value of 95%. Regression correlation testing was also carried out resulting in an average value of regression coefficient (r) of 0.9967 showing the closeness of the relationship between the filament current variable and the potentiometer voltage in the indirect measurement system.