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Online Muon Capture and Decay Experiment. Megan Alexander, Daniel Miner, Wojtek Skulski, Frank Wolfs University of Rochester Work funded by a grant from the APS WYP 2005 and a grant from the NSF. Overview. Purpose: - PowerPoint PPT Presentation
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Online Muon Capture and Decay Experiment
Megan Alexander, Daniel Miner, Wojtek Skulski, Frank Wolfs
University of RochesterWork funded by a grant from the APS WYP
2005 and a grant from the NSF.
APS Meeting March 2006 M.Alexander 2
Overview
Purpose: To capture and share data from cosmic muons, making a “real” physics experiment accessible to the public.
In this talk:Experimental detailsWebsite tour
APS Meeting March 2006 M.Alexander 3
Motivation
Time dilation (special relativity)Classic experiment, popular in advanced physics labsOutreachMount Washington, NH
APS Meeting March 2006 M.Alexander 4
Detector(Scintillator + PMT)
Experiment Setup
InternetInternet
DDC-8 Circuit Board
(DSP)
Cosmic Muons
ToolsXilinxCypress EZ-USB
BlackBoxApache
XML/SWF Charts
AWStats
APS Meeting March 2006 M.Alexander 5
DDC-8Developed by Wojtek Skulski.
Diagnostic OUT40 MHz * 10 bits
JTAG connector
FPGA
ADC 40 MHz * 10 bits (8 channels)
16 bidirectional TTL lines + 1 in(pool of extra logic I/O)
Analogsignal IN8 channels (only 1 used)withdigital offsetand gain control
RS-232
Logic connectors NIM 16 lines IN, 8 lines OUT
USB
RAM500 kB
ECL clock IN(optional)
microprocessor
APS Meeting March 2006 M.Alexander 6
Typical Muon Signals
Stopping Muons:Passing Muons:
μ+
μ+
e+
μ+
ve
μ+
vμ
APS Meeting March 2006 M.Alexander 7
Web View: Waveforms
Time constant: 2.1 μs
http://wolfspc.pas.rochester.edu/muon/daq.html
APS Meeting March 2006 M.Alexander 8
Web View:Energy Spectra
http://wolfspc.pas.rochester.edu/muon/EnergySpectra.html
• Conventional muon lifetime experiments do not exploit DSP for particle ID: this one does!
APS Meeting March 2006 M.Alexander 9
Downloadable Data
http://wolfspc.pas.rochester.edu/muon/DLData.html
APS Meeting March 2006 M.Alexander 10
Downloadable Data
View from Excel, MATLAB
APS Meeting March 2006 M.Alexander 11
Summary and Conclusion
Physics outreach enabled by hardware, software, web tools.Total unique visitors: