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 QDC Delay
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
The small pipe side by side is for alpha measurement.
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: Set up experimental tools
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