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ElVis Developments for Simulation and Analysis Programs

ElVis Developments for Simulation and Analysis Programs. Tarun Pondicherry Summer 2006 Science Ed High School Intern Eliot Feibush, Mentor 8/16/2006. MSE – Motional Stark Effect. Local Magnetic Field Measurements by Motional Stark Splitting – JET

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ElVis Developments for Simulation and Analysis Programs

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  1. ElVis Developmentsfor Simulation and Analysis Programs Tarun Pondicherry Summer 2006 Science Ed High School Intern Eliot Feibush, Mentor 8/16/2006

  2. MSE – Motional Stark Effect • Local Magnetic Field Measurements by Motional Stark Splitting – JET • Determine direction of magnetic field lines inside plasma • MSE diagnostic measures current profiles in plasma Source: JET Website - jet.efda.org

  3. MSE Simulation • Simulate MSE diagnostic for ITER design • Source code from JET • Required GHOST graphics package – impractical to distribute • Modified by Tina Ludescher to output results to netCDF file instead of using GHOST • Separated Simulation from Visualization • Display graphs of netCDF variables in ElVis

  4. ElVis Developmentsfor Simulation and Analysis Programs Tarun Pondicherry Summer 2006 Science Ed High School Intern Eliot Feibush, Mentor 8/16/2006

  5. Overview Background My Topics: 1. MSE (Motional Stark Effect) 2. Monitoring Simulations 3. Interactive Techniques Demo

  6. Background • ElVis – Java based Visualization Software which graphs outputs of scientific experiments and simulations • Accepts input from a variety of sources including Data Files, Sockets, Simulations, etc. • Graphs 1D and 2D data in several forms (Animated, Surface, Contour, etc.) • Reads variables from netCDF Files; User composes graphs

  7. NetCDF File Format • File format and interface for scientific data storage • Machine Independent and accessible through URL • Consist of a collection of dimensions, variables and attributes • Variable • Single Value • Array of one or more Dimensions • Variables and Dimensions can have attributes specifying units, alternate names or other information • Unidata provides NetCDF API’s in C, Java and Fortran

  8. NetCDF File Elements • convention = elvis • elvis_template = mytemplate.xml • time = 50 • long_name = time_of_capture • unit = seconds • x_coordinate = 200 • time [time] • sine [x_coordinate X time] • amplitude = 1 • time = {0,2,6,17,…} • sine = {-1, -0.5, 0, 0.5,…} {-1, -0.75, -0.5, -0.25,…} … • Global Attributes • … • Dimensions • Attributes • … • … • Coordinate Variables [dim name] • Attributes • … • … • Variables (definition) [dim0 x dim1 x …] • Attributes • … • … • Variables (data) • …

  9. 1. ElVis Enhancements for netCDF Data • Motivation • MSE display requirements • Generalize monitoring of Fusion Simulations & Analysis programs

  10. My Goals Improve netCDF Panel in ElVis • Insert in first cell of GraphWindow (previously separate frame, confusing when many files open) • List all variables (previously listed only 1D and 2D) • Read files with large number of variables (TRANSP) Add New Capabilities to ElVis • Select 2D subset of 3D+ variable • Transpose 2D variable • Save/Load GW presentation templates • Progress pop-up • Monitor output files from long-running programs

  11. Data Selection • Allows variables with more than 2 dimensions to be plotted in ElVis • Users specify a 2D “slice” by selecting the index for the fixed dimensions • Result is ordinary 2D data • Can be presented as Animated, Surface, Contour or Multiplot • 2D slices can be plotted with normal 2D variables, other 2D slices or a combination of both – multiple 2D variables

  12. Data Selection and Display

  13. 2D Presentation Styles • Allow ElVis to convert between all types of 2D plots (Animated, f(x,i), Contour, Surface) • Original 2D data stored in memory • When presentation changes, data is read from memory to create the desired plot Added multi-plot – requested by MSE physicists

  14. Logarithmic Surface Plots • Applied logarithmic scaling functions to Surface plots • (Log functions developed by Steve Krenzel) • All axes (X, Y, Z) can be independently scaled as linear or logarithmic

  15. Transpose Data • Transposes data within the 2D array prior to plotting • Once transposed, data remains that way for any presentation option • Animated swaps X Axis and Index • Contour swaps X and Y • Surface swaps X and Z • Multiplot swaps X Axis and Index

  16. Data Interpolation • Allows Variables of Different Lengths to be plotted against each other • Adds or removes x values to match number f(x) values • Values added created by linear interpolation • Values removed by periodic sampling • Works for both 1D and 2D data • Performed automatically when dataset sizes vary

  17. Data Interpolation Example

  18. Graph Window Templates • Suggested by Steve Scott for MSE • Allow ElVis to show NetCDF Files with a user specified view • Enables author of the data to format graphs (without programming!) for collaborators to view over the Internet

  19. Graph Window Templates • Stored in XML under the user home directory • ElVis automatically finds templates in 3 ways: • .cdft file with the same name as the NetCDF File in the same directory • elvis_template attribute specified in NetCDF File • default template stored in settings.props in user home • Users can choose a different template from the drop down in the template panel • ElVis stores the most recently used template as the default

  20. 2. NetCDF File Monitoring • Allows Elvis to monitor simulations which periodically update a NetCDF File • Polls the file on the server, checks for dimension length change; user specifies rate • Starts and stops automatically if “running” attribute set to true or false in the NetCDF File • When the file is updated, ElVis loads new file and replots with the current template

  21. File Monitoring – Solution • Generalized way to monitor simulations • Overcomes the need for custom programming for monitoring • Can be combined with templates to compose the graphs without programming • Fusion Simulation Projects

  22. 3. Interactive Techniques • Resize graphs when frame is resized - warm-up exercise • Legend display options • Interactive Positioning • Graph width • Dataset editor • Edit set names • Color, style, thickness • Points, Lines • Access Greek Letters in Unicode Font • Save/Load to ElVis convention netCDF file

  23. Unicode Font Character Chooser • Unicode –16 bit font overcomes limit of ASCII’s 8 bits • Enables storing 1000s of characters organized by function, e.g. Greek Letters, Math Symbols • Java uses Unicode Fonts  Developed Character Chooser • Displays selected section in a grid • Displays recently selected characters at the bottom • User clicks on letter to add it to label

  24. Summary – How I spent my summer vacation • ElVis enhancements for MSE display requirements • Generalized solution for monitoring simulations • Interactive techniques

  25. Acknowledgements • Eliot Feibush • Jill Foley for MSE background info • James Morgan, Andrew Post-Zwicker and the PPPL Science Education Department • Princeton Plasma Physics Lab

  26. Demo • ElVis • http://w3.pppl.gov/elvis/

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