crane: a jas-based data acquisition system for cosmic rays jennifer docktor & manuel reyes...
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CRAnE: A JAS-based Data CRAnE: A JAS-based Data Acquisition System for Cosmic RaysAcquisition System for Cosmic Rays
Jennifer Docktor & Manuel ReyesMentors Tom Glanzman & Willy Langeveld
August 13, 2003
Department of Energy Office of Science
Science Undergraduate Laboratory Internship (SULI)
Stanford Linear Accelerator Center
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Cosmic RaysCosmic Rays• High-energy protons collide
with atoms in Earth’s upper atmosphere
• Air shower particles with sufficient energy to reach the surface (mostly muons) are recorded as cosmic ray events by ground detectors
• Origin of high energy cosmic rays is not fully understood; the prevailing theory suggests extensive B-fields surrounding supernova remnants accelerate protons in space to near-light speeds.
http://itss.raytheon.com/cafe/qadir/q2953.html
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• Endeavor supported by the National Science Foundation
• Educate high school students and teachers about high-energy physics and involve them in research
• SLAC workshop June 19 – July 3, 2003– Built 10 cosmic ray telescopes (CRTs) that will be used to conduct experiments
in their classrooms
QuarkNet
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CRT DesignCRT Design
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CRT designCRT design• Scintillator panels
• Plastic produces a small flash of light when a charged particle passes through it
Scintillator panelsLight guides
• Polished Lucite “light guides”
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• Opaque materials for light shielding
CRT design
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CRT designCRT design
• Photomultiplier tubes (PMTs)• Convert light pulses into amplified electrical pulses
PMT
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• Voltage converters (base)• Converts low voltage (5V DC) from the logic board to high
voltage for the PMT
CRT designCRT design
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CRT designCRT design
•QuarkNet logic board version 2.0•GPS unit
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CRT Construction Week(June 23 – 27, 2003)
MannyJen
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CRTCRT ExperimentsExperiments(Only a very few examples)(Only a very few examples)
1. Measure angular distribution of cosmic ray flux through the paddles.
2. Muon flux experiments, such as by varying altitude or indoor/outdoor.
3. Air shower experiments (requires collaboration with other schools)
determine frequency, patterns, direction, and characteristics of air showers
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Why CRAnE?Why CRAnE?
• Data from the logic board is not easy to work with.
• For the purpose of a high school classroom, graphical data is more accessible.
• CRAnE (Cosmic Ray Analysis Environment) acts as a bridge between the raw output of the board and the needs of a classroom.
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Raw Data FormatRaw Data Format
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CRAnE InterfaceCRAnE Interface
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CRAnE in Action!CRAnE in Action!
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Java Analysis Studio (JAS)Java Analysis Studio (JAS)
• Java – platform independent, relatively portable
• Java Analysis Studio (JAS) is a freely available data analysis package that provides graphing capabilities.
• http://jas.freehep.org
• CRAnE acts as a plug-in to JAS, extending its operation to include cosmic ray data processing.
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Features of CRAnEFeatures of CRAnE
• Reads serial port output of CRT logic board
• Collects and saves relevant cosmic ray event data
• Maintains plots of cosmic ray rates in real-time
• CRAnE currently provides users with two graphs presenting information on the observed cosmic ray rate
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Plot 1: CR rate vs. TimePlot 1: CR rate vs. Time• The first graph displays the cosmic ray rate observed in n-
minute intervals over time
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Plot 2: Time interval histogramPlot 2: Time interval histogram• The second graph is a histogram of the time elapsed between
consecutive cosmic ray events detected by the CRT
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The Future of CRAnEThe Future of CRAnE
• Currently, the plan is to distribute CRAnE software along with the CRTs to the high schools interested in carrying out experiments
• CRAnE will also be made freely available for download on the Internet
• http://www.slac.stanford.edu/quarknet/crane (Under Construction)
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Suggested ImprovementsSuggested Improvements
• CRAnE currently uses the internal clock time of the user’s computer for graph data. Future versions will hopefully parse the GPS time data from the logic board.
• More graphical representations of the data should be supplied to users.
• CRAnE should also be able to recreate a graph from saved data files.
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AcknowledgmentsAcknowledgments
• SULI and the DOE Office of Science
• Tom Glanzman and Willy Langeveld• Project mentors
• Tony Johnson and Max Turri• JAS developers
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Questions?Questions?