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Spatial resolution improvement of PICOSEC Micromegas precise timing detectors

F. M. Brunbauer, R. Aleksan, Y. Angelis, S. Aune, J. Bortfeldt, M. Brunoldi, J. Datta, D. Desforge, G. Fanourakis, D. Fiorina, K. J. Floethner, M. Gallinaro, F. Garcia, I. Giomataris, K. Gnanvo, Q. Huang, F. J. Iguaz, D. Janssens, A. Kallitsopoulou, I. Karakoulias, M. Kovacic, P. Legou, M. Lisowska, J. Liu, M. Lupberger, I. Maniatis, M. Micetic, H. Muller, E. Oliveri, T. Papaevangelou, M. Pomorski, L. Ropelewski, K. Salamon, D. Sampsonidis, L. Scharenberg, T. Schneider, E. Scorsone, L. Sohl, N. Shankman, M. van Stenis, Y. Tsipolitis, S. E. Tzamarias, A. Utrobicic, I. Vai, R. Veenhof, P. Vitulo, X. Wang, S. White, Z. Zhang, Y. Zhou

Abstract

The combination of a Cherenkov radiator with a semi-transparent photocathode and a Micromegas based amplification stage allows PICOSEC Micromegas detectors to achieve a time resolution of better than 15ps. While tileable prototypes with 10x10 channels feature 1x1 cm^2 readout pads, finer readout granularity can be used to improve the spatial resolution. We report on the study of high readout granularity PICOSEC Micromegas prototypes which achieve around 0.5mm spatial resolution with 3.5mm large pads. No significant improvement was found when readout pad size was further reduced to 2.2mm. The timing resolution of the leading pad was found to be slightly degraded but remained better than 20ps for a medium granularity prototype. The achieved spatial resolution can enable PICOSEC Micromegas to be used as precise timing and moderate resolution tracking detector simultaneously.

Spatial resolution improvement of PICOSEC Micromegas precise timing detectors

Abstract

The combination of a Cherenkov radiator with a semi-transparent photocathode and a Micromegas based amplification stage allows PICOSEC Micromegas detectors to achieve a time resolution of better than 15ps. While tileable prototypes with 10x10 channels feature 1x1 cm^2 readout pads, finer readout granularity can be used to improve the spatial resolution. We report on the study of high readout granularity PICOSEC Micromegas prototypes which achieve around 0.5mm spatial resolution with 3.5mm large pads. No significant improvement was found when readout pad size was further reduced to 2.2mm. The timing resolution of the leading pad was found to be slightly degraded but remained better than 20ps for a medium granularity prototype. The achieved spatial resolution can enable PICOSEC Micromegas to be used as precise timing and moderate resolution tracking detector simultaneously.
Paper Structure (8 sections, 6 figures)

This paper contains 8 sections, 6 figures.

Table of Contents

  1. Introduction
  2. Experimental methods
  3. Spatial and timing resolution measurements
  4. Multi-pad module prototypes
  5. Medium readout granularity
  6. High readout granularity
  7. Discussion
  8. Conclusions

Figures (6)

  • Figure 1: Picosec Micromegas schematic: Cherenkov radiator with semi-transparent photocathode and two-stage Micromegas amplification structure. Taken from BORTFELDT2018317.
  • Figure 2: Comparison of Picosec readout structures: medium granularity (left) and high granularity (right). The active area is 15 mm diameter in both versions.
  • Figure 3: Exemplary event recorded with the medium granularity detector. Four pads are hit, the green point displays the reference tracker information, the semi-transparent blue circle shows the extent of the Cherenkov cone and the red dot shows the reconstructed position from a center-of-gravity algorithm.
  • Figure 4: Distribution of the number of hit pads per event for the two readout granularities.
  • Figure 5: Residual distribution in X direction between measured and reference hit position of the medium granularity readout.
  • ...and 1 more figures