A normal-pressure MWPC for beam diagnostics at RIBLL2

TL;DR

This paper presents a newly developed normal-pressure MWPC for beam diagnostics at RIBLL2, featuring a large sensitive area, improved design to reduce discharges, and achieving high efficiency and resolution in tests with X-ray and ion beams.

Contribution

The paper introduces a novel MWPC design with a wider frame and no protection wires, optimized for beam diagnostics at RIBLL2, demonstrating effective performance in tests.

Findings

Position resolution better than 250 μm

Detection efficiency higher than 90%

Successful testing with X-ray and ion beams

Abstract

A normal pressure MWPC for beam diagnostics at RIBLL2 has been developed, which has a sensitive area of 80 mm$\times$80 mm and consists of three-layer wire planes. The anode plane is designed with a wider frame to reduce the discharge and without using protection wires. The detector has been tested with a $^{55}$Fe X-ray source and a 200 MeV/u $^{12}$C beam from CSRm. A position resolution better than 250 $\upmu$m along the anode wires and a detection efficiency higher than 90% have been achieved.