Chung-Yao Chao Fellowship Interview

Transcription

1 Chung-Yao Chao Fellowship Interview Shaobo WANG Shanghai Jiao Tong University, China April 24, 2017 Supervisor: Prof. Xiangdong JI Dr. Ke HAN 1

2 Outlines Resume: Education Internship Previous Work and Achievements: HARPO experiment PandaX-III experiment Working plan 2

3 Resume : Education Education: Ph.D (2012~2016): LLR laboratory (Laboratoire Leprince-Ringuet), École Polytechnique, France. Thesis : Study of a TPC, active target for the polarimetry and gamma-ray astronomy by pair creation in HARPO (Hermetic ARgon Polarimeter). M.Sc (2010~2012): Physics department, Paris 11 University, France. Specialty in fundamental physics : particle accelerators and interactions with matter. B.Sc (2006~2010): Huazhong University of Science and Technology (HUST), China. Specialty : Optoelectronics. Fellowship: CNRS : National Centre of Scientific Research, France CNES : National Center of Space Studies, France 3

4 Resume : Internship ~ : Analysis of delta-rays created by cosmic rays in a TPC at high pressure, and characterization of the reconstruction of low energy electron, LLR, École Polytechnique, France ~ : Gold nanoparticles: Simulation of thermal field produced by photoinduit by using COMSOL, LPQM, École Centrale Paris, France ~ : Contribution to the study of the resolution in HADES (High Acceptance DiElectron Spectrometer) detector, IPN, Paris 11 University, France ~ : The calculation of the cross-section of Higgs production of LHC by various simulation softwares, LAL, Paris 11 University, France. 4

5 Previous Work and Achievements HARPO (Hermetic ARgon POlarimeter) experiment Prototype detector signal amplification and collection system calibration Event reconstruction frameworks and prototype detector performance characterization Data-taking with gamma beam at NewSUBARU of Spring 8 in Japan PandaX-III experiment Prototype detector characterization Micromegas calibration 5

6 HARPO experiment HARPO: a TPC concept as a high angular resolution polarimeter and telescope in the MeV-GeV range 30cm cubic TPC Ar/iC 4 H 10 95/5 % up to 5 bar Amplification : Micromegas (Micro-Mesh Gaseous Structure) +2GEM (Gas Electron Multiplier) Prototype Detector 2x288 strips readout (x&y), 1mm pitch AFTER chips readout electronics, 511 time bins, up to 50MH Polarization measurement Polarization asymmetry ϕ Azimuthal angle ϕ -> polarization D. Bernard,NIM A 701 (2013) 225 6

7 HARPO : Micromegas+GEMs characterization Characterization with 55 Fe (5.9keV) gamma source: 1bar Ar:Iso (95%:5%) Characterization with cosmic rays in prototype detector: 0.5bar ~2bar Ar:Iso (95%:5%) Characterization with cosmic rays in prototype Detector Characterization with 55 Fe Proc. SPIE 9144 arxiv: [astro-ph.im] Micromegas + GEM Micromegas + 2GEMs Effective gains up to a few 10,000 Cosmic track at 2 bar Ar:Iso Proceedings : PoS(TIPP2014)133 Gain in cosmic run 7

8 HARPO : Event Reconstruction Provide the HARPO event reconstruction and data-analysis frameworks Algorithm of event reconstruction Charge distribution from through tracks Event definition and selection Detector performance characterization Development in Kalman filter of 6D to improve angular resolution of detector Raw map X-Z Raw map Y-Z Proc. SPIE Int. Soc. Opt. Eng. 9144, 91441M (2014), [arxiv: [astro-ph.im]] Proc. SPIE Int. Soc. Opt. Eng. 9905, 99052R (2016), [arxiv: [astro-ph.im]] 3d track mrad Nucl. Instrum. Meth. A 701, 225 (2013) [arxiv: [astro-ph.im]] 8

9 HARPO : Data-taking with gamma beam Provide the HARPO monitoring and offline analysis Data analysis frameworks: polarization measurement Event monitoring Detector alignment Analysis basic Gas monitoring: gain and drift velocity Gas monitoring P = 0 P = 1 Trigger system performance: >trigger rate >electronic dead time >background rejection efficiency >useful event detection efficiency Nucl. Instrum. Meth. A, arxiv: [physics.ins-det] Proc. SPIE Int. Soc. Opt. Eng. 9905, 99052R (2016), [arxiv: [astro-ph.im]] Events selection and fraction calculation PoS(ICRC2015)1016 Gamma conversion in gas: > Theoretical calculation by cross-section > compare with data Journal of Physics: Conference Series (JPCS), arxiv: [astro-ph.im] Invitation report in 7th conference on Large TPCs for Low Energy Rare Events Proc. Real Time Conference (RT), 2016 IEEE-NPSS, /RTC

10 PandaX-III experiment PandaX-III: a high pressure TPC concept to search for neutrinoless double beta decay of 136 Xe Hall #B4 at China Jin Ping underground Lab (CJPL-II): 5 m of ultra-clean water shielding in all directions Copper Vessel: operated at 10 bar TPC (Time Projection Chamber): symmetric, double-end charge readout with cathode in the middle Amplification: Microbulk Micromegas Comparison of 0νββ and 2νββ signals.the sum of two electron energy Readout: 2 series of strips (x, y) Digitization : AGET chips electronics, 512 time bin, up to 100MHz Q value of 136 Xe 0νββ ~ 2.5 MeV PandaX-III detector Tank of water at CJPL-II PandaX-III CDR, [arxiv: }; Accepted by 10 SCIENCE CHINA Physics, Mechanics & Astronomy

11 PandaX-III : Prototype Detector characterization Prototype Detector characterization: Gas (1~10 bar): Ar:CO2, Ar:Iso and Xe:TMA Prototype Detector : Vessel: 600L(18kg Xe at 10bar) Source : 241 Am (gamma and alpha) and 137 Cs (gamma) 7 Micromegas modules (1 Micromegas mounted) 241 Am energy spectrum at 1bar Ar:Iso(5%) To optimize the design of Micromegas readout plane To study the energy calibration of TPC 13.9 kev Energy resolution: 17.5% at 13.9keV 17.8 kev 17.1% at 17.8keV To develop algorithm of 3D track reconstruction Muon track at 2 bar Xe:TMA XeSAT 2017 internal conference invitation Report 11

12 PandaX-III : Prototype detector characterization Micromegas calibration: Test box : one Micromegas Configurations: 55 Fe(5.9keV gamma), 1bar Ar:CO2 (70%:30%) Energy spectrum Preparing for 7 Micromegas: Micromegas capacitances measurement before gluing Prototype detector disassemble and clean Filed cage assembly and modification to adapt to 7 Micromags modules Feedthrough leakage test at 10 bar 12

13 Working plan Prototype detector characterization: 7 Mricromegas calibration by test box and then installation into prototype detector Prototype detector performance test with 241 Am gamma source at 1~10 bar Ar:Iso Data taking with 137 Cs, 22 Na and 232 Th gamma source at 1~10 bar Xe:TMA to calibrate energy resolution and event track Preparations for detector set up Event Reconstruction: Event reconstruction algorithm Track fitting Complement of PandaX-III data analysis frameworks 13

14 Working plan PandaX-III experiment calibration system: Design and construction of PandaX-III calibration system Multi-Micromegas calibration Radioactivity sources selection and simulation Detector calibration Data analysis Detector performance Excepted event recognition and selection Background research 14

15 Back up 15

16 sensitivity gap V. Schönfelder, New Astronomy Reviews, 48 (2004) 193 MeV GeV Leptonic model or Hadronic model H. Zhang and M. Böttcher, A.P. J. 774, 18 (2013) 16