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New method for clustering thresholds determination in Microstrip Silicon Detector

S. Mazzolani, I. Mattei, L. Servoli

Abstract

The Microstrip Silicon Detector (MSD) is one of the subsystems of the FragmentatiOn Of Target (FOOT) experiment whose goal is to measure double differential nuclear fragmentation cross sections for applications in particle therapy and radioprotection in space. The MSD, composed of six 150 $μ$m-thick silicon sensors arranged in three X-Y measuring planes, is part of the FOOT experiment tracking region. In this work, we propose a new method to set the MSD thresholds for the clustering algorithm independently of the other detectors of the experiment. The obtained values can be used as reference values from which to perform a threshold scan in order to evaluate the single-ion detection efficiency of each MSD sensor and to orient the clustering analysis using tracking information.}

New method for clustering thresholds determination in Microstrip Silicon Detector

Abstract

The Microstrip Silicon Detector (MSD) is one of the subsystems of the FragmentatiOn Of Target (FOOT) experiment whose goal is to measure double differential nuclear fragmentation cross sections for applications in particle therapy and radioprotection in space. The MSD, composed of six 150 m-thick silicon sensors arranged in three X-Y measuring planes, is part of the FOOT experiment tracking region. In this work, we propose a new method to set the MSD thresholds for the clustering algorithm independently of the other detectors of the experiment. The obtained values can be used as reference values from which to perform a threshold scan in order to evaluate the single-ion detection efficiency of each MSD sensor and to orient the clustering analysis using tracking information.}
Paper Structure (8 sections, 2 equations, 6 figures, 1 table)

This paper contains 8 sections, 2 equations, 6 figures, 1 table.

Table of Contents

  1. Introduction
  2. The FOOT experiment
  3. Materials and Methods
  4. The Microstrip Silicon Detector (MSD)
  5. MSD Calibration
  6. Algorithm for setting cluster thresholds
  7. Data Analysis
  8. Conclusion

Figures (6)

  • Figure 1: Schematic view of the FOOT Magnetic Spectrometer setup FOOT_2021.
  • Figure 2: A schematic image of the Microstrip Silicon Detector. It shows a top view of the aluminum box containing the six 150 $\mu$m-thick sensors arranged in pairs, along with the three electronic connectors. The beam direction is along the Z-axis.
  • Figure 3: Event display of the quantity $\text{Signal} = \text{Signal}^{RAW} - \text{Ped} - \text{CN}$ normalized to the Single Strip Noise as a function of the strips related to Sensor 4, for a Calibration Run of the CNAO2024 data-taking campaign.
  • Figure 4: Cumulative histograms of Signal$^{Rel_{MAX}}_j/\text{SSN}_j$=$(\text{Signal}^{RAW}_{j} - \text{Ped}_j - \text{CN}_k)/\text{SSN}_j$ when exceeding the threshold variable Nthr, realized using the strip distance parameter equal to 1. The curves are normalized to 10$^4$ events, relate to MSD Sensor 4 and have been computed with two runs of CNAO2024 data taking campaign. The Y-axis, in logarithmic scale, represents the fraction of relative maxima above threshold, while the X-axis corresponds to Nthr. (Left) Representation of a Calibration Run (in absence of an incoming particle beam). (Right) Representation of a Physics Run (protons at 230 MeV impinging on the FOOT magnetic spectrometer setup with no target).
  • Figure 5: Cumulative histograms of a Calibration Run in blue, a Physics Run in red and their difference in green, relating to MSD Sensor 4.
  • ...and 1 more figures