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

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Overview of Sonoluminescence project at Academia Sinica & CIAE

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

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

  3. 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）

  4. 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

  5. ORNL Experiment

  6. Proof of Neutron Emission in ORNL’s Experiment

  7. 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 highER 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)

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

  9. Mechanical Structure

  10. Setup – Gas System

  11. Setup – DAQ VME Crate System Slot PMTs … VME-PCI Gate PZT-driver Synchronous Output QDC Delay Tektronix 5054A oscilloscope PMT PC (LabView7.0) USB-GPIB

  12. Setup--DAQ

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

  14. Different Cavity Configuration

  15. 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

  16. CIAE Facility – CPNG • CIAE Pulsed Neutron Source • 14MeV or 3MeV • 1.5ns spill length, repetitive rate 1.5MHz • 1010 neutrons per spill Beamline

  17. CIAE Facility – Detector • NE213 • Liquid scintillation neutron detector • Sensitive Area: Φ180mm×50mm • Detect efficiency acceptable when E>1MeV

  18. Summary • SL research project initiated • AS led, use HEP style/techniques to study the table-top 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

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