Veksler and Baldin Laboratory of High Energy Physics
Detector Technologies Seminar № 8-2026
Date and Time: Thursday, 8 October 2026, at 11:00
Venue: bld. 215, room 347, Veksler and Baldin Laboratory of High Energy Physics, online on Zoom
Seminar topic: “Performance and radiation damage of the heavy-ion silicon beam tracker in the BM@N Experiment”
Speaker: Danil Chemezov
Abstract:
The Silicon Beam Tracker (SiBT) of the BM@N experiment at the NICA complex (JINR, Dubna) is designed to reconstruct trajectories of beam ions upstream of the target. It consists of three stations based on double-sided silicon strip detectors (DSSDs) installed directly in the relativistic heavy-ion beam. The SiBT performance and radiation damage were studied using data from the 2026 experimental run with 124Xe beams at 1.6, 2.2, and 3.0 AGeV. During the run, the leakage current of the SiBT3 detector increased by 28.95 μA, while the charge collection efficiency in the beam center decreased to approximately 68% at the nominal bias voltage of 30 V. Increasing the bias voltage to 90 V restored the charge collection efficiency to approximately 95%. Despite the radiation-induced signal degradation, the tracking efficiency remained close to 99%. The accumulated radiation damage was also used to reconstruct the spatial distribution of the integrated beam fluence from strip-by-strip leakage-current measurements.
Seminar topic: “CVD detectors for the monitoring of extracted heavy ion beams from the Nuclotron”
Speaker: Aleksei Sheremetev
Abstract:
It is presented the development and first beam tests of fast single crystal chemical vapor deposition diamond detectors with broadband readout electronics for heavy ion beam diagnostics at the Nuclotron, in the context of detector and beam monitoring developments for the Nuclotron based Ion Collider Facility experimental programme. The detectors are based on chemical vapor deposition diamond films grown on boron doped high pressure high temperature diamond substrates and integrated with a compact broadband readout chain using commercially available 2 GHz amplifier stages. Their performance was characterised with radioactive sources and with a 1.76 AGeV Xe beam.
Measurements with a 238Pu alpha source demonstrated an energy resolution of approximately 228 keV FWHM using pulse integral reconstruction. In the 1.76 AGeV Xe beam test, substrate side signal readout with a single 20 dB amplification stage was used to preserve the dynamic range for large amplitude heavy ion signals. Timing analysis with a constant fraction method yielded a single detector time resolution of σdet = 9.0 ± 0.4 ps for 1.76 AGeV Xe ions, demonstrating that scCVD diamond detectors with broadband readout are promising sensors for ultrafast heavy ion beam diagnostics, reference timing for time of flight.