Experimental set-up for high precision nuclear physics measurements at the IFIN-HH 9MV tandem accelerator

The experimental set-up working on the zero-degree beam-line of the 9MV Tandem Accelerator at IFIN-HH now offers a high accuracy and repeatability of the heavy ions nuclear physics experiments. This is achieved by an automated moving system, placed inside a circular reaction chamber, consisting of four moving arms covering a complete 360°. Each arm can hold one detector and is powered by a stepper motor having the possibility of micro-stepping up to 1/256 if the application requires, with a reduction gear box of 60:1 and a resolver acting as a witness for eventual position corrections. Moreover, the target support, positioned in the center of the chamber, is also assisted by a stepper motor and can rotate over 360° clockwise or counterclockwise. Two identical $\Delta$E – E telescopes have received an upgrade in both the gas automated pressure and constant flow regulation by using a software implemented PID (Proportional-Integral-Derivative) controller.