SAD and Python with EPICS

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SAD and Python with EPICS

• at IHEP,Beijing, 2002.8.21
• Noboru Yamamoto
• KEK, JAPAN

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Simple, well understood behavior
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High Level Applications in KEKB

• Applications and Operator displays in KEKB
  Application Launcher

• SAD is widely used for high level applications.
• medm/dm2k is used for simple displays.
• Python is also used for application development.

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SAD applications

• Operator Interface
• Optics measurement
• Optics calculation and Optics
• Collision Monitors ...
• Slow Feedback (with OPI)
• iBumpa system keeps beams in collision
• Closed orbit correction

)It is preferable to separate FB loop and its
user interface into different processes.
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KEKB Launcher

• Program written in SAD/KEKB Frame
• Starting point of KEKB operation
• User can register a new command on the fly.
• simple load balancing between servers.
• User can select a host to execute a command.

) Application reads a configuration file ,
kbl.conf, at start up and on request by operator.
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Applications in KBL
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A sample SAD/KBFrame application
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Applications using Python and Pmw
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SAD and Python compared

• Python
• General Purpose Object Oriented dynamic language
• Developed by Open source project
• Simple and Clean syntax
• Support CA and Tk widget
• RDBMS interface
• Variety of extension modules

• SAD
• Accelerator modeling
• Developed at KEK
• Mathematica like scripting
• support CA and Tk widget
• Modules for KEKB operation

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SAD installation

• SAD Source Download Page
• http//acc-physics.kek.jp/SAD/SADDownloadPage.html
  
• You need ID and password to download the source
  code. Contact susumu.kamada_at_kek.jp for your ID
  and password.
• You also need Tcl/Tk source code and a patch
  specific to SAD/Tkinter.
• Electric conference room for SAD (in Japanese).

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SAD script

• SAD Scripts follows Mathematica(R) syntax.No
  statements, just functions.
• Every Elements has a form
• Headarg1, arg2,...
• eg. Ifcond, st1, st2
• Some Element has a special notation
• Plus 1, 2 lt-gt 12
• Lista,b,c lt-gt a, b, c
• Name of element/function is same as that of
  Mathematica.

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KEKB Frame

• Framework, i.e. a collection of programs/scripts,
  to support development of GUI Application
• Standard Menu
• Help menu including Process Info
• status bar including print button
• Build upon Tkinter Widget Set

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Extending SAD

• SAD modules can be used to extend SAD script
  functionality, i.e. add a new function to SAD
  script.
• SAD modules is a library written in SAD script.
• Fortran and C is used to develop SAD program
  itself.
• Fortran or C can be used add a new functionality
  to SAD script.

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Python installation

• Python Web site http//www.python.org/
• Source code and binary(Windows, Mac, rpm)
• gnuziptar configure make from tar.gz file.
• Use of Pmw(Python mega widget) together with
  Tkinter is recommended
• Use of Gtk(PyGtk) is another possibility.
• Get CA interface from ANL EPICS web site or KEKB
  web site (or Both)

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Python syntax

• Python uses indentation to specify a block
  structure of a program e.g.if cond
  statements_1else statements_2other_statemen
  ts
• Usage of special characters are common to most of
  programing language.

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Extending Python

• Python modules add new functions and/or classes
  to Python language.
• There already exists a rich set of Python
  modules.
• C or C can be also used to develop new modules
  ( C-modules).
• Tools such as SWIG can be used to develop a C-
  module.

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Embedding Python

• Python can be used as an extension language of
  the existing program.
• It adds flexibility and extendability to the
  program.
• For example, PostgreSQL, a free RDBMS, can use
  Python to define a stored procedure or define a
  new object.