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Online Muon Capture andDecay ExperimentMegan Alexander, Daniel Miner,
Wojtek Skulski, Frank WolfsUniversity of Rochester
Work funded by a grant from the APS WYP 2005 and agrant from the NSF.
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Overview
Purpose:To capture and share data from cosmicmuons, making a “real” physics experimentaccessible to the public.
In this talk:Experimental detailsWebsite tour
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Motivation
Time dilation (special relativity)Classic experiment, popular in advancedphysics labsOutreachMount Washington, NH
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Detector(Scintillator + PMT)
Experiment Setup
Internet
DDC-8Circuit Board
(DSP)
Cosmic Muons
ToolsXilinxCypress EZ-USBBlackBoxApacheXML/SWF ChartsAWStats
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DDC-8Developed by Wojtek Skulski.
DiagnosticOUT40 MHz * 10bits
JTAG connector
FPGA
ADC 40 MHz * 10bits (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 clockIN(optional)
microprocessor
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Typical Muon SignalsStopping Muons:Passing Muons:
μ+
μ+
e+
μ+
ve
μ+
vµ
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Web View: Waveforms
Time constant: 2.1 μs
http://wolfspc.pas.rochester.edu/muon/daq.html
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Web View:Energy Spectra
http://wolfspc.pas.rochester.edu/muon/EnergySpectra.html
• Conventional muonlifetime experiments donot exploit DSP forparticle ID: this one does!
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Downloadable Data
http://wolfspc.pas.rochester.edu/muon/DLData.html
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Downloadable Data
View from Excel, MATLAB
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Summary and Conclusion
Physics outreach enabled by hardware,software, web tools.Total unique visitors:
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