Imaging $^{55}$Fe Electron Tracks in a GEM-based TPC Using a CCD Readout
| Autor: | D. Loomba, N. Phan, E. R. Lee |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics - Instrumentation and Detectors
Physics::Instrumentation and Detectors FOS: Physical sciences Electron 7. Clean energy 01 natural sciences 030218 nuclear medicine & medical imaging law.invention High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) 03 medical and health sciences 0302 clinical medicine Optics law 0103 physical sciences Instrumentation Mathematical Physics Physics Range (particle radiation) Scintillation Time projection chamber 010308 nuclear & particles physics business.industry Detector Instrumentation and Detectors (physics.ins-det) Lens (optics) Full width at half maximum business Energy (signal processing) |
| Popis: | Images of resolved 5.9 keV electron tracks produced from $^{55}$Fe X-ray interactions are presented for the first time using an optical readout time projection chamber (TPC). The corresponding energy spectra are also shown, with the FWHM energy resolution in the 30-40\% range depending on gas pressure and gain. These tracks were produced in low pressure carbon tetrafluoride (CF$_4$) gas, and imaged with a fast lens and low noise CCD camera system using the secondary scintillation produced in GEM/THGEM amplification devices. The GEM/THGEMs provided effective gas gains of $\gtrsim 2 \times 10^5$ in CF$_4$ at low pressures in the 25-100 Torr range. The ability to resolve such low energy particle tracks has important applications in dark matter and other rare event searches, as well as in X-ray polarimetry. A practical application of the optical signal from $^{55}$Fe is that it provides a tool for mapping the detector gain spatial uniformity. |
| Databáze: | OpenAIRE |
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