Design and identification of PID control on the cyclotron DECY 13 hydrogen ion source

The ion source is one part of the cyclotron system which functions to provide hydrogen gas input. The change in Hydrogen gas input from a manual valve system to an automatic one using a control device causes the gas flow to become unstable. Hydrogen gas flow affects the vacuum in the vacuum chamber, if an error occurs, it will interfere with the current flow and cause a discharge that causes damage to the instrumentation tool. So it is necessary to control the stability of the hydrogen gas flow. The application of the PID control system to the hydrogen gas flow is one of the efforts made to reduce errors that occur during DECY 13 cyclotron operation. PID is a control that provides proportional, derivative and integral values for errors that occur every time and reduces them. PID used in this study using the Ziegler Nichos method. This method uses the reaction curve of the system output to determine the control value. The modeling of the gas flow system is carried out by direct experiments by providing input in the form of flow to the vacuum chamber, so that the system response curve is obtained and processed with Matlab software. The results of the experiments carried out obtained a 3rd order transfer function with a match rate of 88.72 %. From this model, the values of Kp, Ki and Kd were adjusted using the Ziegler Nichols method and compared with IAE and ITAE to obtain control parameters. The results of the values obtained using the ZN method produce an overshoot of 0.6 %, a rise time of 0.2 s and a settling time of 0.5 s. The results of these responses indicate that the flow of hydrogen gas will be stable and provide a fast response when an error occurs so that it will not disturb the vacuum, discharge and maintain the stability of the DECY 13 cyclotron operation. (author)