Overview of Sonoluminescence project at Academia Sinica CIAE

Overview of Sonoluminescence project at Academia Sinica & CIAE Fong-Kai Lin(林楓凱) Tsz-King Wong(王子敬) Feb 2, 2005 1

Outline • • Background Collaboration Experiment in Oak Ridge National Lab. Our Research Directions Progress at Academia Sinica Progress at CIAE Summary 2

Collaboration • • • Academia Sinica CIAE (北京原子能院) NCU (中央大學) NCCU (中正大學) NJU （南京大學） 3

Background • Sonoluminescence found in 1930’s. (MBSL) • Gaitan made SBSL in 1989 • Nuclear fusion in SL ? – ORNL group first announced their observation in 2002 – More convictive proof found in 2004 • Key physical questions – How hot/dense does it get inside the SL bubble? – Light emission mechanism not clearly known 4

ORNL Experiment 5

Proof of Neutron Emission in ORNL’s Experiment 6

Our Research Direction • Understand light emission mechanism in SL -- Estimate the size of light emitting region in bubble by HBT method -- Pico-second timing measurement for SL pulse shape • Study prospects of high. ER temperature emissions than optical -- Try to repeat ORNL’s experiment -- Detect UV emission in SL by fluorescent luminescence (To be reported by Yang Yi tomorrow) 7

Progress at Academia Sinica • Experimental setup and improvement – Mechanical structure for angular measurement – DAQ (Lab. View and Linux) – Data Analysis (ROOT) – Gas system – Feedback control • Different cavity configurations 8

Mechanical Structure 9

Setup – Gas System 10

Setup – DAQ VME Crate System Slot … PMTs VME-PCI Gate PZT-driver Synchronous Output PMT Delay Tektronix 5054 A oscilloscope QDC USB-GPIB PC (Lab. View 7. 0) 11

Setup--DAQ 12

Setup – Feedback Control Resonance recedes as time passing! Function Generator PMT QDC PC frequency 13

Different Cavity Configuration 14

Progress at CIAE • Target: to repeat the ORNL experiment • Facility – CIAE Pulsed Neutron Generator – Neutron detector – PSD (pulse shape discriminator) and TOF (time of Flight) detector for particle discrimination and energy measurement 15

CIAE Facility – CPNG CIAE Pulsed Neutron Source • 14 Me. V or 3 Me. V • 1. 5 ns spill length, repetitive rate 1. 5 MHz • 1010 neutrons per spill Beamline 16

CIAE Facility – Detector • NE 213 • Liquid scintillation neutron detector • Sensitive Area: Φ 180 mm× 50 mm • Detect efficiency acceptable when E>1 Me. V 17

Summary • SL research project initiated – AS led, use HEP style/techniques to study the tabletop experiment, an inter-discipline science • AS: Set up experimental tools – UV detection: result soon – High acoustic pressure cavity • CIAE: neutron generator and detection – Repeat ORNL experiment – Under preparation 18