Upgrade Of Cosmic Ray Reference System And Muon Track Reconstruction

Human understanding of cosmic ray has a history of one hundred years, with the continuous development of detection technique of cosmic rays with a more comprehensive understanding, and cosmic ray study also promoted the progress of human beings in particle physics and astrophysics. Since the past few decades, scientists from all over the world to do a variety of cosmic ray experiment, but still failed to explain the fundamental problem of the cosmic ray.In astrophysics, often by all sorts of high-energy particles from space radiation flow is called cosmic rays. In astrophysics, Cosmic ray acceleration mechanisms are accelerated out of the cosmic ray particles called primary cosmic rays, and secondary cosmic rays is refers to the primary cosmic rays and interstellar space gas interact of cosmic ray particles. In different energy cosmic ray observation method is different also, facing challenges and opportunities of a new generation of cosmic ray detection experiment was born, Chinese scientists put forward Large High Altitude Air Shower Observatory (Large High led Air small Observatory, LHAASO for short), located in China’s sichuan province ganzizhou daocheng county, covering area of 1 square kilometers, a variety of points of detector array.The square kilometre array (KM2A) is the main body of LHAASO array, it has two major scientific goal:more than 30 tev gamma ray astronomy and the knee area of physics.Is LHAASO cooperative member of shandong university is in charge of KM2A array detector unit of more than 5600 electronic each performance index for testing and calibration work, so the design has set up the Cosmic Ray Reference System (CoRaRS).The first chapter of this paper about the understanding of cosmic rays, the second chapter describes LHAASO KM2A array detector (ED) the new electronic unit performance requirements and design structure and then introduces the Cosmic Ray Reference System structure and working principle.In the third chapter is based on the location of the TGC features introduced the Cosmic Ray Reference System upgrade and cosmic ray muon track reconstruction method, so as to improve the spatial precision of the system and the position resolution (see chapter 4), the third chapter sections is introduced in the system application of the delay line to the ED power influence, to calculate the delay line of signal attenuation effect, then on the measuring accuracy of QDC scale, thus made a preparation for accurate measurement, the delay line and without delay line measurement made a contrast. The fourth chapter is the location of the system after the upgrade resolution and time resolution. Calculation results show that the spatial precision and resolution and location are improved, and the time delay system scintillator detector made scale, scale with methods like before the upgrade, but the scale is not the same as the examples.Time of scintillation detector measurement scale, the eight full scale value distribution of scintillation detector, CoRaRS time resolution and the construction of basic consistent, when finally the time resolution of the single scintillation detector for 600 ps, the reconstruction of the CoRaRS temporal resolution was about 500 ps.The fifth chapter is the system upgrade after testing the new ED, because the area of new ED the story of the detector is greater than the CoRaRS test area, two measurement, so we call them respectively is after the first two and two, the time resolution of 1.59 ns and 1.59 ns, the discriminator threshold voltage of -2 of the detection efficiency under the conditions of were higher than 95%, using CoRaRS reconstruction ability of particle track scanning electron detector for the whole area, got on various performance in all areas of its distribution uniformity.The sixth chapter is a simple summary of the whole work.