Measurement of longitudinal electron diffusion in liquid argon

• DOI: 10.1016/j.nima.2016.01.094
• Publication Date: 2016-02-07T12:00:33Z
• Authors: Yichen Li; Thomas Tsang; Craig Thorn; Xin Qian; Milind Diwan; Jyoti Joshi; Steve Kettell; William Morse; Triveni Rao; James Stewart; Wei Tang; Brett Viren
• Keywords: Photocathode

Accepted by NIM on January 29th. 2016<br/>We report the measurement of longitudinal electron diffusion coefficients in liquid argon for electric fields between 100 and 2000 V/cm with a gold photocathode as a bright electron source. The measurement principle, apparatus, and data analysis are described. Our results, which are consistent with previous measurements in the region between 100 to 350 V/cm [1] , are systematically higher than the prediction of Atrazhev-Timoshkin[2], and represent the world's best measurement in the region between 350 to 2000 V/cm. The quantum efficiency of the gold photocathode, the drift velocity and longitudinal diffusion coefficients in gas argon are also presented.<br/>