Veksler and Baldin Laboratory of High Energy Physics
Detector Technologies Seminar № 7-2026
Date and Time: Thursday, 24 September 2026, at 11:00
Venue: bld. 215, room 347, Veksler and Baldin Laboratory of High Energy Physics, online on Zoom
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Seminar topic: “In situ performance of the Vertex Silicon Plane in the BM@N experiment during Run 9”
Speaker: Dmitrii Dementev
Abstract:
The Vertex Silicon Plane (VSP) was commissioned and operated for the first time as the most upstream tracking station of the Baryonic Matter at Nuclotron (BM@N) experiment at the NICA accelerator complex during Run 9. The station consisting of six double-sided silicon microstrip modules based on the CBM–BM@N detector technology was installed about 8 cm downstream from the target inside the SP-41 analyzing magnet.
The in situ module performance was characterized in terms of the signal-to-noise ratio, time resolution, and Lorentz drift in the magnetic field. The most probable cluster signal-to-noise ratio ranges from 15.5 to 33.2, while the time resolution relative to the trigger pulse is about 12 ns. The tracking performance was evaluated using track–hit residuals and hit-matching efficiency; two independent reference configurations based on the Forward Silicon Detector (FSD) and Gas Electron Multiplier (GEM) tracking systems give consistent efficiencies of about 95%.
The contribution of the VSP to the BM@N tracking performance was further studied through the transverse track impact parameter and the reconstruction of short VSP–GEM tracklets. Owing to its position close to the target and its coverage at large polar angles, the VSP provides an additional near-target tracking point and makes it possible to extend the geometrical acceptance beyond that of the FSD- and GEM-based central tracking system.
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Seminar topic: “CVD detectors for the monitoring of extracted heavy ion beams from the Nuclotron”
Speaker: Aleksei Sheremetev
Abstract:
It is preasented 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 program. 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 characterized 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 sigma_det = 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 systems, and monitoring of the beam time structure at the Nuclotron and future NICA experiments.