Speaker
Description
The Compressed Baryonic Matter (CBM) experiment is a fixed-target experiment designed to explore the properties of nuclear matter under extreme densities. It will be hosted at the upcoming Facility for Antiproton and Ion Research (FAIR), Darmstadt, Germany. The CBM Muon Chamber (MuCh) detector system will comprise four stations of gaseous detectors interleaved with absorber layers. Each station will consist of three layers of detectors. The first two stations employ advanced Gas Electron Multiplier (GEM) technology, capable of operating at very high interaction rates. As part of the FAIR Phase-0 program, the mini-CBM (mCBM) experiment has been conducted using the SIS18 beamline at GSI.
During the mCBM campaign in May 2025, two detector modules, one from Station-1 and one from Station-2 were installed and tested with high-intensity beams, along with other CBM subsystems. The Station-1 module was of pre-series type, while the Station-2 module represented the first prototype, commissioned for tests with nucleus–nucleus collisions during this beamtime. The active detector lengths were 80 cm for Station-1 and 100.5 cm for Station-2. A moulded cooling plate, developed for thermal management of the Front-End Boards (FEB), was also tested.
In this campaign, 209Bi(68+) ions at 1.7 AGeV (18.4 Tm) were collided with a 2.5 mm thick gold (Au) target, with beam intensities reaching up to 8 × 10^8 ions per 6 s spill. The MuCh system successfully recorded data across a range of operating voltages and beam intensities for both stations. A maximum MuCh data rate of ~600 MB/s was achieved. Preliminary analysis indicates a time correlation of ~23 ns with respect to the Time-of-Flight (TOF) reference detector, which remained stable throughout entire run. Furthermore, the MuCh modules demonstrated clear digi linearity with respect to TOF signals, confirming their stable and linear response.
| Position | PhD Student |
|---|---|
| Affiliation | Experimental High Energy Physics and Applicatons Group, Variable Energy Cyclotron Centre, Kolkata - 700064, INDIA |
| Country | India |