MDS Plus at H-1NF

(Note: Reload often as this page is being updated in march 99)

The main MDSPlus information source is at MIT MDSPlus An introduction is given in The MDSPlus Data Acqusition System and MDSPlus Data Acquisition System, Current and Future

At the moment MDSPlus is available on the prlas2 workstation (Open VMS). MDS and MDSPlus coexist within the IDL there (please use 5.1 or higher). The basic access is MDS$OPEN, x=MDS$VALUE() but there are many other IDL accessible functions (advanced)
Instructions for setting up on Linux boxes at rsphysse

MDSPlus Q&A

How do I cut and paste signals from the traverser to the scope?
http://cmod2.pfc.mit.edu/help/@mdsplus/About
gives me garbage like
About

=title About MDSplus
=keyword About
External clocks on A14: If an 80kHz clock is connected to the "CLOCK" input, in the "external clock" field enter * : * : 12.5E-6 (details)
ANU MDSPLUS problems

PPPL MDSPLUS/IDL subroutines
DIII data papers
MDSPlus code Repository

TREE_VIEW

This is an IDL point and click data viewer written by John Howard at ANU, extended and ported to Windows by Boyd Blackwell:
To invoke (from OVMS) - make sure SETUP H1 has been executed, say in your LOGIN.COM
PRLAS2$> TREE_VIEW
This is like an integrated version of the traverser and scope, with additional point and click measurement features, and both an IDL and TCL command line, with history pulldowns including shot number. Hopefully more powerful and intuitive than "scope", but a little slower to zoom. This is in fact a generalized compound widget for building and adding to data viewers, with a small stub to make a simple viewer.

Fixit list

Incorrect times displayed in plots (PC version OK - Boyd to fix soon)
Inc/Dec shot number doesn't work (John?? - soon)
Needs lots of VM (100MByte) (only OVMS - PC version is very efficient - needs about 10MByte) - No easy solution - get a large quota for now, and restart every few hours. (Tom and Josh?? - there are some new VM keywords in IDL 5.2?)
Severe indigestion when attempting to read non existent shots (John??)

Bugs to Boyd Blackwell, John Howard

XWindows Traverser

The X-windows traverser will normally be accessible as an Xwindows menu item, but you can invoke it thru

PRLAS2>   mcr traverser                 [e.g.   mcr traverser -tree h1data -shot 32500]

Notes:

H1DATA database is a true MDSPlus database, with individual shots whose records (a few selected) point to a few selected shots of the old MDS data. I hope to do a translation of a series of about 10 shots, copying all data to the new format, for practice accessing newly defined data.
e.g. so far just shot 32500. (i_fault, dia_335)

Workshops/Seminars

Friday 1:30 H-1 Control room: MDSPlus Data Access and Aquisition:
Tom will demonstrate data access tools, then there will be an opportunity for hands-on access data on 4 screens in that room. Users will create and edit example trees, and retrieve data form them.
Later workshops will focus on
a/ the best structure for H-1 data
b/ access to old data through MDSPlus (MDS will be still available for
a few years at least)
c/ data acquisition in detail: adding new devices, task dispatcher.
d/ remote access to H-1 data and other databases

External clocks on A14: If an 80kHz clock is connected to the "CLOCK" input, in the "external clock" field enter * : * : 12.5E-6
On the a14 form there is a field called "External clock:" directly under the "Trigger:" field. If you put something in there then the module is set to external clock and the store uses this field for the clock expression. If your external clock is a single frequency clock then you put in a range. For example, a 1 MHz clock would be represented as: * : * : 1E-6 More complicated expressions can be used for complicated clocks. -TWF

Add me to H-1NF MDSPlus Mailing List (Directory of all files in this area) see also National Transport Code Collaboration

Questions about this page can be directed to: Boyd Blackwell

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