Performance and Radiation Damage of the Heavy-Ion Silicon Beam Tracker in the BM@N Experiment
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 DSSD of the third station of SiBT 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, yielding an average fluence of approximately 1.3×1012 neq/cm2.
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BibTeX
@misc{chemezov2026performance,
title = {{Performance and Radiation Damage of the Heavy-Ion Silicon Beam Tracker in the BM@N Experiment}},
author = {D. Chemezov and S. Khabarov and Yu. Kopylov and I. Osokin and A. Sheremeteva and E. Streletskaya and O. Tarasov and E. Zubarev and N. Zamiatin},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.17947},
eprint = {2610.17947},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.17947},
}
RIS
TY - UNPB
TI - Performance and Radiation Damage of the Heavy-Ion Silicon Beam Tracker in the BM@N Experiment
AU - D. Chemezov
AU - S. Khabarov
AU - Yu. Kopylov
AU - I. Osokin
AU - A. Sheremeteva
AU - E. Streletskaya
AU - O. Tarasov
AU - E. Zubarev
AU - N. Zamiatin
PY - 2026
DA - 2026/10/13
PB - arXiv
DO - 10.48550/arxiv.2610.17947
UR - https://arxiv.org/abs/2610.17947
AB - 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 DSSD of the third station of SiBT 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, yielding an average fluence of approximately 1.3×10^12 n_eq/cm^2.
ER -