Instrument characterization demonstrates high optical gain in an argon-CF4 optical time projection chamber, indicating robust cosmic ray imaging without image post-processing.
Argon gas doped with 1% wavelength-shifter (CF 4 ) has been employed in an optical time projection chamber (OTPC) to image cosmic radiation. We present results obtained during the system commissioning, performed with two stacked glass thick gaseous electron multipliers (THGEMs) and an electron-multiplying charge coupled device (EMCCD camera) at 1 bar. Preliminary estimates indicate that the combined optical gain was of the order of 10 6 (ph/e), producing sharp and high-contrast raw images without resorting to any filtering or post-processing. A first assessment of the impact of pressurization showed no change in the attainable gains when operating at 1.5 bar.
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Amedo et al. (2024) studied this question.
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