The Telescope Array (TA) is the largest hybrid cosmic ray detector in the
Northern Hemisphere, which observes primary particles in the energy range from
2 PeV to 100 EeV. The main TA detector consists of 507 plastic scintillation
counters on a 1.2-km spacing square grid and fluorescence detectors at three
stations overlooking the sky above the surface detector array. The TA Low
energy Extension (TALE) hybrid detectors, which consists of ten fluorescence
telescopes, and 80 infill surface detectors with 400-m and 600-m spacing, has
continued to provide stable observations since its construction completion in
2018. The TAx4, a plan to quadruple the detection area of TA is also ongoing.
About half of the planned detectors have been deployed, and the current TAx4
continues to operate stably as a hybrid detector. I review the present status
of the TA experiment and the recent results on the cosmic-ray anisotropy, mass
composition and energy spectrum.
Comment: Submission to SciPost Phys. Proc
Subjects: Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Instrumentation and Methods for Astrophysics