Abstract
Straw tube detectors are single wire proportional counters that are widely used as tracking devices. We have carried out R&D activity with a straw tube detector prototype. The aim of this work is to study the stability of the performance in terms of gain and energy resolution of these types of detectors under high rate of radiation. The gain and energy resolution of the detector are studied along with its variation with ambient temperature and pressure. X-rays from a radioactive source are used to irradiate the detector and to monitor the energy spectra simultaneously for calculating the gain. The method followed here is unique as the ageing measurements have been performed without using an accelerated particle beam or any radiation generator. The performance of a straw tube detector has been studied in a laboratory for more than 800 h at a stretch using a single sealed radioactive X-ray source with high intensity. Variation of gain and energy resolution of the straw tube detector under X-ray irradiation in \(\hbox {Ar}/\hbox {CO}_2\) gas mixture (volume ratio 80/20) is discussed in this article. The gain of an aged straw depends on gas flow rate. We have estimated the time required for the gain of a straw tube detector under ageing tests to recover on increasing the gas flow rate. We have also estimated the time resolution of the straw tube detectors by using cosmic rays as the trigger for the \(\hbox {Ar}/\hbox {CO}_2\) gas mixture in 70/30 volume ratio (different gas mixture was used for the measurement of the time resolution). This type of ageing and time resolution measurements in \(\hbox {Ar}/\hbox {CO}_2\) gas mixture has not been reported earlier. The details of the measurement process and the experimental results are presented in this article.
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Acknowledgements
The authors would like to thank Late Prof. Vladimir Peshekhonov of JINR, Dubna and Dr Christian J Schmidt of GSI Detector Laboratory for providing the straw tube prototype. They also would like to thank Dr S Chattopadhyay and Mr J Saini of VECC, Prof Rajarshi Ray, Prof Somshubhro Bandyopadhyay and Dr Sidharth K Prasad of Bose Institute for valuable discussions and suggestions during the course of the study. This work is partially supported by the research grant SR/MF/PS-01/2014-BI from DST, Govt. of India and the research grant of CBM-MuCh project from BI-IFCC, DST, Govt. of India. S Raha would like to acknowledge the support received under the Raja Ramanna Fellowship scheme of the Department of Atomic Energy, Government of India. S Biswas acknowledges the support of Intramural Research Grant provided by Bose Institute and DST- SERB Ramanujan Fellowship.
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Roy, S., Jaiswal, S., Chatterjee, S. et al. Stability study and time resolution measurement of straw tube detectors. Pramana - J Phys 95, 50 (2021). https://doi.org/10.1007/s12043-021-02094-0
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DOI: https://doi.org/10.1007/s12043-021-02094-0