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ABSTRACT

Web Interfaces to MDSplus Data* W. Davis, P. Roney, T. Carroll, T. Gibney, D. Mastrovito Princeton Plasma Physics Laboratory, Princeton, NJ 08543. ABSTRACT

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ABSTRACT

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  1. Web Interfaces to MDSplus Data*W. Davis, P. Roney, T. Carroll, T. Gibney, D. Mastrovito Princeton Plasma Physics Laboratory, Princeton, NJ 08543 ABSTRACT The MDSplus Data Acquisition System has been used successfully on NSTX at PPPL since early 1999. While the X-window-based tools supplied with MDSplus are powerful, and the IDL programming language and the supplied TDI language are effective for complex and specialized analyses, some users prefer the convenience of applications which can be run in a Web browser. Web users don't need to know about X-windows, or even have accounts or privileges on server computers. MDSplots.html reads MDSplus "Scope" setup files and plots MDSplus signals with overlays. It uses a Perl script to open a pipe to an IDL subprocess, so security and performance issues are a concern. TreeSearch.html provides several options for finding information in MDSplus trees. MDSshots.html lists shots where the maximum for a specified signal is above or below a specified value. A variety of information in an MS-SQL database is also accessible from a Web browser. These utilities could be used at other sites which data in MDSplus. - needed • Why Use the Web to Access Data? Platform Independence No Accounts or Passwords necessary No special software needed No OS (e.g. Unix) knowledge needed No environmental variables needed (e.g. Paths) X-windows setup can be difficult • • • • • . Happy Users Methods Used HTML Forms TCP/IP Ports Perl Script Interactive Data Language (IDL) Active Server Pages Unix Shell Scripts Standard Security Practices Unix Cron Jobs Sample of Output from MDSplots Page SUMMARY Big help for some users No performance problems Not too difficult to build and maintain No Security Problems *Work Supported by US DOE Contract No. DE-AC02-76CHO-3073

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