Chung-Yao Fellowship 2016 interview

Transcription

1 1/12 Chung-Yao Fellowship 2016 interview Hiroki KUSANO Department of Physics and Astronomy, Shanghai Jiao Tong University May 8, 2016

2 Resume 1 2/12 Personal data Name: Hiroki Kusano Date of birth: Nov 15, hkusano@sjtu.edu.cn Nationality: Japan Education Oct 2012: PhD in Pure & Applied Physics (Waseda Univ., Japan) Doctor thesis: Studies on electron transport processes in high-density gaseous xenon: Dependence of electron drift and diffusion on gaseous density Advisor: Prof. N. Hasebe Mar 2009: Master of Science (Waseda Univ., Japan) Master thesis: Characterization of electron avalanche in high-density gaseous xenon Mar 2007: Bachelor of Science (Waseda Univ., Japan) Job history Apr 2016 present: Apr 2013 Mar 2016: Apr 2009 Mar 2011: Postdoctoral fellow, Shanghai Jiao Tong Univ., China Junior researcher, Waseda Univ., Japan Research associate, Waseda Univ., Japan

3 Resume 2 3/12 Research interest Experimental physics in radiation detectors and radiation measurements, and its application to fundamental physics and space missions R&D of high-pressure xenon detector High-pressure xenon time projection chamber Fundamental characteristics of high-pressure, liquid, and solid xenon such as ionization, scintillation, and electron transport R&D of nuclear spectrometer for planetary exploration Active X-ray spectrometer Study on pyroelectric X-ray generator γ-ray and neutron spectrometer Publication Refereed journal: 6 (4 articles as the first author) Refereed proceeding: 7 (5 articles as the first author) Presentation in international conference: 61 (9 presentations as the first author) Presentation in domestic conference: 37 (15 presentations as the first author)

4 Previous work and achievements 1 Development of a high-pressure xenon time projection chamber 4/12 High pressure xenon time projection chamber Prototype HPXe-TPC 3D trajectory of charged particles can be obtained from timing, energetic, and positional information on charge and light signals Application MeV γ-ray imager 0νββ search Fundamental characteristics of gaseous xenon as radiation detection medium Reconstructed 2D images of α particles (8 samples) M. Mimura, H. Kusano et al., Int. Workshop Adv. Cosmic Ray Sci. (2008)

5 Scintillation & ionization yield by α-particles 5/12 Scintillation and ionization yield was measured in high-pressure xenon under various gaseous density and electric field The results indicate the change of energy dissipation process of α particles in high-pressure xenon Ws-value for zero electric field Correlation of electrons and photons Average energy expended per photon or electron-ion pair T. Ishikawa, H. Kusano, et al., KEK Proc (2010) 204. H. Kusano et al., NIM A 683 (2012) 40.

6 Electron transport parameters 6/12 Electron mobility and longitudinal diffusion coefficient were measured under various gaseous density and electric field The results indicate the density-dependent variation of the effective momentum-transfer cross section for electron-atom scattering Mobility Longitudinal diffusion coefficient H. Kusano et al., Jpn. J. Appl. Phys. 51 (2012) H. Kusano et al., Jpn. J. Appl. Phys. 51 (2012) H. Kusano et al., JINST 8 (2013) C01028.

7 Previous work and achievements 2 7/12 Development of nuclear spectrometers for planetary exploration The elemental composition on planetary surface is essential to the study on the origin and evolution of planet Remote sensing: γ-ray & neutron spectrometry Characteristic γ-rays from natural radioactive isotope and induced by galactic cosmic rays Thermal & epithermal neutrons Cosmic ray (p, a, ) Fast neutron Gamma ray Global exploration Local exploration Landing exploration: X-ray spectrometry Characteristic X-rays induced by active excitation source Thin or no atmosphere Fluorescent X-ray Inelastic collision Neutron capture Atomic excitation Active excitation Moderation Nuclear interaction Fast neutrons Natural radioactivity K, Th, U Planetary surface

8 X-ray, γ-ray and neutron spectrometers 8/12 Proposal of an active X-ray spectrometer and γ-ray & neutron spectrometer Active X-ray spectrometer onboard the rover of lunar landing mission γ-ray & neutron spectrometer for Martian moon probe Li-glass scintillator GS20: φ100 mm x 4 mm thick Boron-loaded plastic scintillator BC454 or EJ254 (5% B): φ100 mm x φ51 mm x 76 mm thick 6 Li(n,α) Electronics box Thermal Nadir Epithermal 10 B(n,α) PMT (2" f) Bleeder circuit Satellite Fast Plastic scintillator SiPM (3 x 3 mm 2 ) Observable light signal Unobservable light signal Electronics box Gd film (0.25 mm thick) Preliminary design Design & development of X-ray, γ-ray and neutron spectrometers Active X-ray spectrometer Development of a new X-ray generator with high X-ray intensity Experimental study of pyroelectric X-ray generator Basic study on X-ray fluorescence analysis of rock and soil samples Effect of sample surface roughness, angle of X-rays, etc.

9 Study on pyroelectric X-ray generator 9/12 X-ray yield from pyroelectric X-ray generator was measured under various conditions in crystal size, inner gas pressure, geometric configuration, etc. More than 10 7 cps of time-averaged X-ray emission rate was achieved, which is about 60 times higher than the commercial one Time profile and energy spectra Pressure dependence Repetition of thermal cycles H. Nagaoka, H. Kusano, et al., Adv. Chem. Anal., Japan 46 (2015) 347. H. Kusano et al., Proc. SPIE 9213 (2014)

10 Summary of previous work and achievements 10/12 R&D of high-pressure xenon detector Measurements of several fundamental parameters in high-pressure xenon, and some of the results were obtained for the first time The results will provide the necessary data for designing and operating novel high-pressure xenon detectors R&D of nuclear spectrometer for planetary exploration Design of prototypes of X-ray, γ-ray and neutron spectrometers Study and improvement of pyroelectric X-ray generator for active X-ray generator Skills Hardware: Design, setup, and operation of detectors (gas, semiconductor, scintillator), vacuum and gas system, related devices (PMT, APD, etc.), and electronics Software: Windows/Linux OS, C/C++ language, ROOT, Garfield++, PENELOPE

11 Working plan 11/12 I will join the PandaX-III experiment to search the 0νββ of 136 Xe Are neutrinos Dirac or Majorana particles? What is the mass of neutrinos? In the PandaX-III experiment, a large-scale time projection chamber using high-pressure xenon, with a pressure of atm, is planned to be constructed Superior energy resolution Capability of background rejection by obtaining the topological information of electrons The main topic of my study is the design and development of the highpressure xenon time projection chamber and related systems (Micromegas readout, gas system, etc.) The results will contribute to the development of a large-scale highpressure detector in Jinping underground laboratory, which is planned to be started in 2017

12 Thank you! 12/12