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Mass testing of SiPMs for the CMVD at IICHEP
by Mamta Jangra, Raj Bhupen, Gobinda Majumder, Kiran Gothe, Mandar Saraf, Nandkishor Parmar, B. Satyanarayana, R. R. Shinde, Shobha K. Rao, Suresh S Upadhya, Vivek M Datar, Douglas A. Glenzinski, Alan Bross, Anna Pla-Dalmau, Vishnu V. Zutshi, Robert Craig Group, E Craig Dukes
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Submission summary
| Authors (as registered SciPost users): | Mamta Jangra |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2208.11446v2 (pdf) |
| Date submitted: | 2022-10-10 08:46 |
| Submitted by: | Jangra, Mamta |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 21st International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI2022) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
A Cosmic Muon Veto Detector (CMVD) is being built around the mini-Iron Calorimeter (mini-ICAL) detector at the transit campus of the India based Neutrino Observatory, Madurai. The CMV detector will be made using extruded plastic scintillators with embedded wavelength shifting (WLS) fibres which propagate re-emitted photons of longer wavelengths to silicon photo-multipliers (SiPMs). The SiPMs detect these scintillation photons, producing electronic signals. The design goal for the cosmic muon veto efficiency of the CMV is $>$99.99\% and fake veto rate less than 10$^{-5}$. A testing system was developed, using an LED driver, to measure the noise rate and gain of each SiPM, and thus determine its overvoltage ($V_{ov}$). This paper describes the test results and the analysed characteristics of about 3.5k SiPMs.
List of changes
1. Figure 1: Labeling of mini-ICAL and CMVD detector has been improved.
2. Figure 3: Bus width (4) label should overlap the bus
- The label is overlapped in new version.
3. Figure 3 and 4: Align figure captions.
- The captions are aligned as suggested.
4. Sec 4 L1 "A typical example of LED ...": Following text might improve clarity. A typical example of SiPM output signal in response to LED excitation is shown in Fig 5a.
- Replaced as suggested.
5. Figure 5b: Not clear in the plot what the number means. It seems to be the difference between peaks. If yes, width arrow can be used to indicate properly.
- Yes, it is the gap between two consecutive peaks. I have mentioned it in the text now.
6. Figure 5c: Can Y axis be defined as Gain (G)?
- Yes, it can be, with a conversion factor. I have implemented the changes.
7. How Vbr is defined from Figure 5c? Add the text.
- Added in the text.
8. Following on previous comment (7), definition of dG/dV is not immediately clear. Describing y axis of figure 5c as Gain can improve that. Similarly, equation 2 and subsequent text use $\mu$ for gain which is not consistent with dG/dV .
- The y-axis of figure 5c is described as gain in the paper now. The text has been added to make the definitions clear.
9. Figure 6: Add more details to the caption.
- I have added little more details in the captions.
10. Can you plot histograms for Figure 6a, Figure 6b and Figure 7 and discuss the spread quantitatively in the conclusion?
- The spread in the numbers are added in the conclusion.
Current status:
Reports on this Submission
Report #1 by Anonymous (Referee 2) on 2022-10-17 (Invited Report)
- Cite as: Anonymous, Report on arXiv:2208.11446v2, delivered 2022-10-17, doi: 10.21468/SciPost.Report.5914
Report
Thank you for the updated manuscript. I have made couple of suggestions and the manuscript can be accepted after implementing those minor changes.
Requested changes
1) Can you highlight that all your measurement were done at a constant temperature/room temperature? You do mention it in the caption of Fig. 6(b); however, it would be useful to highlight this earlier as well.
2) You have used wording 'Vth' in the conclusion to indicate breakdown voltage as well as over-voltage? Use consistent terminology and define Vth before using.