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تسجيل مستخدم جديدقياس شحنة الذرات الكوزمية مع محدد السنتيلاتور البلاستيكي لDAMPE
Charge Measurement of Cosmic Ray Nuclei with the Plastic Scintillator Detector of DAMPE
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واحدة من الأهداف الرئيسية لمستكشف الذرات البروتونية للمادة المظلمة (DAMPE) هي قياس الذرات النووية للأشعة كوكبية حتى عدد كبير من التي في، أو أكثر من ذلك، والتي تبقى مصدرها وانتشارها موضوعاً حارّاً في الفلك. الكشاف البلاستيكي الذي يوجد على رأس DAMPE مصمم لقياس شحنات الذرات النووية من H إلى Fe ويعمل ككشاف رفض للتمييز بين الأشعة غاما والذرات المشحونة. نقترح في هذا البحث عملية اعادة التشحين لتحسين أداء الكشاف البلاستيكي في قياس الشحنة. أساسيات نهجنا، بما في ذلك العثور على المسار، والتوحيد للكشاف البلاستيكي، وتصحيح الضعف الضوئي، وتصحيح الخفض والتساوي، يتم توصيفها بتفصيل في هذا البحث بعد وصف قصير لهيكل الكشاف ومبدأ عمله. نتائجنا تظهر أن الكشاف البلاستيكي يعمل بشكل جيد جداً وأن تقريباً جميع العناصر في الأشعة الكوكبية من H إلى Fe تم تحديدها بوضوح في طيف الشحنة.
One of the main purposes of the DArk Matter Particle Explorer (DAMPE) is to measure the cosmic ray nuclei up to several tens of TeV or beyond, whose origin and propagation remains a hot topic in astrophysics. The Plastic Scintillator Detector (PSD) on top of DAMPE is designed to measure the charges of cosmic ray nuclei from H to Fe and serves as a veto detector for discriminating gamma-rays from charged particles. We propose in this paper a charge reconstruction procedure to optimize the PSD performance in charge measurement. Essentials of our approach, including track finding, alignment of PSD, light attenuation correction, quenching and equalization correction are described detailedly in this paper after a brief description of the structure and operational principle of the PSD. Our results show that the PSD works very well and almost all the elements in cosmic rays from H to Fe are clearly identified in the charge spectrum.
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The Plastic Scintillator Detector (PSD) of the DArk Matter Particle Explorer (DAMPE) is designed to measure cosmic ray charge (Z) and to act as a veto detector for gamma-ray identification. In order to fully exploit the charge identification potentia
l of the PSD and to enhance its capability to identify the gamma ray events, we develop a PSD detector alignment method. The path length of a given track in the volume of a PSD bar is derived taking into account the shift and rotation alignment corrections. By examining energy spectra of corner-passing events and fully contained events, position shifts and rotations of all PSD bars are obtained, and found to be on average about 1mm and 0.0015 radian respectively. To validate the alignment method, we introduce the artificial shifts and rotations of PSD bars in the detector simulation. These shift and rotation parameters can be recovered successfully by the alignment procedure. As a result of the PSD alignment procedure, the charge resolution of the PSD is improved from $4%$ to $8%$ depending on the nuclei.
he DArk Matter Particle Explorer (DAMPE) is a general purposed satellite-borne high energy $gamma-$ray and cosmic ray detector, and among the scientific objectives of DAMPE are the searches for the origin of cosmic rays and an understanding of Dark M
atter particles. As one of the four detectors in DAMPE, the Plastic Scintillator Detector (PSD) plays an important role in the particle charge measurement and the photons/electrons separation. The PSD has 82 modules, each consists of a long organic plastic scintillator bar and two PMTs at both ends for readout, in two layers and covers an overall active area larger than 82 cm $times$ 82 cm. It can identify the charge states for relativistic ions from H to Fe, and the detector efficiency for Z=1 particles can reach 0.9999. The PSD has been successfully launched with DAMPE on Dec. 17, 2015. In this paper, the design, the assembly, the qualification tests of the PSD and some of the performance measured on the ground have been described in detail.
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