Speaker
Description
Making precise calorimetric measurements of energy deposition in large liquid argon detectors depends on being able to accurately reconstruct the total deposited light given what is observed at the detectors. Understanding how the light travels and is potentially lost in the detector is a key input to that reconstruction. We present a direct measurement of the total attenuation length of vacuum ultraviolet light in liquid argon. This wavelength range covers the scintillation wavelengths of Argon and Xenon-doped Argon, a range where attenuation is dominated by Rayleigh scattering. The measurement was made in pure liquid argon at the Fermilab Noble Liquid Test Facility. Uniquely, the attenuation is measured as a function of wavelength using a monochromator rather than using the light produced from scintillation.
