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The JSNS$^2$ (J-PARC E56) experiment aims to search for a sterile neutrino atthe J-PARC Materials and Life Sciences Experimental Facility (MLF). After thesubmission of a proposal to the J-PARC PAC, Stage-1 approval was granted to theJSNS$^2$ experiment on April 2015.This approval followed a series of backgroundmeasurements which were performed in 2014.  Recently, funding (the grant-in-aid for scientific research (S)) in Japan forbuilding one 25~ton fiducial volume detector module was approved for theexperiment. Therefore, we aim to start the experiment with one detector inJFY2018-2019. We are now working to produce precise cost estimates and schedulefor construction, noting that most of the detector components can be producedwithin one year from the date of order. This will be reported at the next PACmeeting.  In parallel to the detector construction schedule, JSNS$^2$ will submit aTechnical Design report (TDR) to obtain the Stage-2 approval from the J-PARCPAC.The recent progress of the R$\&$D efforts towards this TDR are shown inthis report. In particular, the R$\&$D status of the liquid scintillator,cosmic ray veto system, and software are shown.  We have performed a test-experiment using 1.6~L of liquid scintillator at the3rd floor of the MLF building in order to determine the identities ofnon-neutrino background particles coming to this detector location during theproton bunch. This is the so-called "MLF 2015AU0001" experiment. We brieflyshow preliminary results from this test-experiment.

Status Report (22th J-PARC PAC): Searching for a Sterile Neutrino at J-PARC MLF (E56, JSNS2)