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This paper reports the recent progress made in developing a spiral fibertracker (SFT) for use in the E36 experiment scheduled at the Japan ProtonAccelerator Research Complex (J-PARC). The primary goal of this positive kaondecay experiment, which uses a stopped kaon beam, is to test lepton flavoruniversality to search for physics beyond the Standard Model of particlephysics. For this experiment, we are currently upgrading the E246 apparatus,which consists of the superconducting toroidal spectrometer previously used atthe High Energy Accelerator Research Organization (KEK), Japan. Conductinghigh-precision measurements will rely on efficiently detecting and trackingcharged particles (i.e., positive muons and positrons) from kaon decays.Combined with the three existing layers of multiwire proportional chambers, theSFT comprises four layers of ribbons, with each layer containing 1-mm-diameterdouble-clad plastic scintillating fibers; the ribbons are spirally wound in twohelicities around the kaon stopping target at the center of the detectorsystem. Scintillation photons are read out by multipixel photon countersconnected to the scintillating fibers by clear optical fiber extensions. Apreliminary bench test shows that a prototype two-layer fiber ribbon exhibits99.6% detection efficiency at the 1-photoelectron threshold. Finally, the SFTwas successfully assembled around the target holder.

Progress in developing a spiral fiber tracker for the J-PARC E36 experiment