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Jiangmen Underground Neutrino Observatory (JUNO) is the next generationneutrino experiment which aims at neutrino mass hierarchy problem along withmany other cutting-edge studies concerning neutrinos. Located 700m undergroundin Jiangmen China, JUNO's central detector is an acrylic sphere filled with20kt liquid scintillator with linear alkylbenzene(LAB) as scintillator solvent.To ensure that an unprecedented energy resolution of $\sigma_E/E \leqslant 3\%$can be reached, LAB used in JUNO must have excellent transparency at thewavelength ranging from 350nm to 450nm.  In the past decade much effort has been devoted to the development of hightransparency LAB based on the measurement of light attenuation length. Througha close cooperation with Jingling Petrochemical Corporation in Nanjing,transparency of LAB samples prepared for JUNO has been improved progressively.However, this improvement is also pushing our apparatus towards approaching itsmeasuring limit, undermining the credibility of our measurement. In order toget a result accurate and precise, an apparatus upgrading and a more detailederror analysis is inevitable.  In this article, we present an analysis of how apparatus upgrading helps withdecreasing measuring errors, and we conducted measurements using the newapparatus on several samples. A detailed error analysis is followed to validatethe results. We propose to apply statistical methods featuring Monte Carlosimulation to estimate systematic uncertainties. Deviations caused by fitmodels is also considered and the overall uncertainty is obtained by combiningtwo independent measurements. We finally report the light attenuation length ofa newly improved LAB sample to be $29.90\pm 0.95$m, which gives a new high ofall the preceding samples we tested. This study may provide a strong evidenceof JUNO's feasibility to reach its energy resolution.

Analysis of Light Attenuation Length Measurement of a High Quality Linear Alkylbenzene for the JUNO Experiment