LHASSO宇宙線能譜展望課件

1、LHASSO宇宙線能譜展望馬玲玲 張壽山 畢白洋 尹麗巧高能物理研究所2017.9威海第三屆LHAASO合作組會(huì)議測(cè)量宇宙線能譜的現(xiàn)狀及所面臨的困難LHAASO分階段、多參數(shù)測(cè)量宇宙線能譜各階段LHAASO測(cè)量宇宙線能譜的能力總結(jié)和展望主要內(nèi)容測(cè)量宇宙線能譜的現(xiàn)狀及困難空間直接測(cè)量地面間接測(cè)量1：在200GV處測(cè)到了各成份能譜變硬2：在10TeV處測(cè)到了小的拐折3：將能譜測(cè)量至100TeV通過大氣簇射間接測(cè)量EAS 陣列契倫科夫望遠(yuǎn)鏡/陣列熒光望遠(yuǎn)鏡H+He能譜的測(cè)量ARGO-YBJ：3TeV-300TeVARGO-YBJ+C-telescopes 100TeV-3PeV700TeV處出現(xiàn)拐折

2、能量標(biāo)定不確定成份測(cè)量困難模型依賴 LHAASO能做什么？LHASSO Introduction 1KM2 Array (KM2A)5195 scintillator detectors every 15 m1171 muon detectors every 30m Wide Field of View Cherenkov telescope Array (WFCTA)18 Telescopes Energy meaurements HillasGeometry reconstruction ，Muon content Geometry reconstruction Core informat

3、ion Water Cherenkov detector Array (WCDA) 78,000m24400m above sea level 從10TeV到EeV跨5個(gè)量級(jí)連續(xù)一致的測(cè)量測(cè)量宇宙線分成份能譜分階段、多參數(shù) LHAASO 對(duì)宇宙線能譜的測(cè)量10TeV-100TeVEnergy ScaleWCDA, WFCTA100TeV-10PeV Knees for H,He,WCDA, WFCTA, KM2A10PeV-100PeVknee of FeWFCTA, KM2A100PeV-2EeV2nd knee & composition changingTransition from g

4、alactic to extra-galacticWFCTA, KM2A多參數(shù)測(cè)量1 inch PMTs增大動(dòng)態(tài)范圍測(cè)量芯區(qū)信息 Red:ironBlue:proton10PeVEnergy100PeVabWCDA:測(cè)量近芯區(qū)粒子數(shù)KM2A：電磁粒子，Muon的橫分布WFCTA: HillasEnergy scale of WFCTA prototype 80mWide Field of View Cherenkov Telescope (WFCTA/LHAASO) 5m2 spherical mirror；1616 PMT array Pixel size 1； FOV: 14 16; El

5、evation angle: 60.One of Cherenkov eventCREAM: 1.09x1.95x10-11(E/400TeV)-2.62 ARGO-YBJ: 1.95x10-11(E/400TeV)-2.61 LHAASO Prototype: 0.94x1.95x10-11(E/400TeV)-2.62The knee of (700230stat.70sys.) TeV is found100TeV 至 10PeV LHAASO探測(cè)器性能研究WCDA芯位重建: 3m方向重建: 0.3芯區(qū)粒子數(shù)KM2ATotal Muon numberWFCTASIZE (total PE

6、 in image) Width, Length簇射方向到像的質(zhì)心的角距離WFCTA指向天頂角：2835參數(shù)之間的相關(guān)性ProtonProton+heliumAperture m2Sr15004000Purity 90%95%有效面積和污染率Proton + helium Event rates and expected spectra based on 15% duty circle ARGO-WFCTA modelHorandel model H4A model KM2A:方向及芯位重建Muon數(shù)目電磁粒子數(shù)目 WFCTA:簇射方向到像的質(zhì)心的角距離Npe:契倫科夫像中的光電子數(shù)WFCTA

7、指向天頂角：45方位角：036010PeV 至100PeV LHAASO探測(cè)器性能研究Air depth of LHAASOAir depth with zenith 45成份鑒別Obtained from KM2ALog10(Ne/Nmuon)Blue: ironRed:protonObtained from WFCTADistance: the angular distance between image center to the arriving directions WFCTAKM2APurity in selecting iron: 84%Purity in selecting i

8、ron and MgAlSi: 94%The reconstructed energy is a function total Npe recorded by WFCTA and RpEnergy resolution 20% (Rp100m)25%(Rp200m)30%(Rp300m)能量重建Rp100mRp200mRp300m有效面積及事例率All particle Iron 50mRp250m50mRp230m50mRp200m100 irons15% duty cycle 15% duty cycle 由于LHAASO探測(cè)器的低閾能，能和空間實(shí)驗(yàn)相連接，因此可以通過交叉標(biāo)定以獲取絕對(duì)能標(biāo)通過WCDA，KM2A和WFCTA的聯(lián)合觀測(cè)，可以獲得proton（90%純度）或者proton+helium