ESME Code Development

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ESME Code Development
Andrey Gutnik September
12, 2005 Physics Research
Amur State University, Russia, Blagoveshensk.
Fermi National Accelerator Laboratory
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CONTENTS

• Introduction to ESME
• - What is ESME?
• - Purpose and Application of ESME
• My Contribution to ESME
• Improving ESME Code / Compatibility with
  F90/95
• - ESME compilation in F90/95
• - Using F90 Modules to replace F77 Common
  blocks
• - USE Statements ONLY attribute
• - Subroutine Interface Blocks
• - INTENT attribute
• Acknowledgements Conclusion

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Introduction ESME

• Written by James MacLachlan and Francois
  Ostiguy
• E.S.M.E ?
• FORTRAN?
• Why use FORTRAN?
• Simulation Program for calculating
• Evolution of distribution of particles in
  energy, and
• azimuth coordinates by iterating a map
  corresponding to the single particle
• equations of motions.
• Optional calculations provided by ESME
• Fourier spectrum of beam current emittance,
  1st and 2nd moments
• Feedback contributions of RF system parameters
• Evaluation of beam induced voltages from space
  charge and longitudinal
• coupling impedance.
• Why converting from F77 to F90/95?

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ESME at a Glance
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ESME at a Glance
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ESME at a Glance
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ESME compilation in F90/95
Makescript
Subroutines
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USE Statements ONLY attribute

• The USE statement provides the means by which
  a scoping unit accesses named data objects,
  derived types, interface blocks, procedures,
  generic identifiers, and namelist groups in a
  module.
• The USE statement without the ONLY option
  provides access to all the public entities in the
  specified module.
• The USE statement with the ONLY option provides
  access only to those entities that appear as
  use-names in the only-list.

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Replacing Common Blocks with Module Programs
USE STATEMENT
INCLUDE line
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Procedure interface block is used to

• Make explicit interfaces for external and dummy
  procedures
• Define a generic procedure name
• Define a new operator symbol or specify extension
  of defined operator
• Define one or more new assignment coercions

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Interface blocks
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Conclusion

• Successful compilation of ESME code on F90/95
  compiler
• Upgrade from F77 to F90/95 Standards was also
  successful
• Progress is being made on porting ESME code to
  GFortran
• (G95 compiler) for Linux

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Acknowledgments

• Thanks go to
• My supervisor, Jim MacLachlan
• My mentors, Alexander Shemyakin and Victor Yarba
• References
• http//www-ap.fnal.gov/ESME

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Improving ESME Code Pointers
Improving ESME Memory Allocation Deallocation
Cray Pointer Extension
VS
ALLOCATABLE
F90/95 VS
F77

• Pointer is a data type
• Holds machine address of pointee

• Pointer is an attribute
• Holds machine address and data type

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