High level applications and EPICS control

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High level applications and EPICS control
GUOBAO SHEN NSLS-II, Control Group May 4th, 2009
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Contents

• From device control to beam control
• HLA environments
• MMLT
• Python
• Model server

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From device control to beam control

• Goal
• Desired accelerator beam
• Accelerator device control
• Hardware subsystem control
• Magnet power supply, beam diagnostics,
• Accelerator beam control
• Realized through device control

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From device control to beam control

• Accelerator device control

Displayer
Device Model
Controller
Sensor
Actuator
Device
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From device control to beam control

• Accelerator device control
• Distributed and modular architecture
• EPICS based device control
• Flexible, extensible, reusable, pluggable

Channel Access Client (CAC)? Connection Data
Transfers
Connection Server
Channel Access Protocol
Connection Data Transfers Channel Access
Server (CAS)?
Connection Data Transfers Channel Access
Server (CAS)?
DB Engine
Types
DB Engine
Types
Device Support
Device Support
Driver Support
Driver Support
I/O Controller
I/O Controller
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From device control to beam control

• Accelerator beam control

Operator Interface
Model based Control
High Level Applications
Beam Monitor
Accelerator Device
Beam
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HLA environments

• What is a HLA environment?
• A software environment for beam commissioning
  operation
• Physics applications, model based control
• Data archiving analysis
• Machine status save restore
• Machine real time status presentation
• Database related applications
• Available environments
• MMLT, SDDS, XAL,

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HLA environments

• Desired features
• Scripting
• Online simulator
• Convenient low level access
• Channel Access supporting
• Plotting and Graphical User Interface
• Numerical libraries (Optional)?

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MMLT

• MMLT is selected
• Closer to our modular architecture
• Rich available applications
• Used by many facilities for many years

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MMLT

• MMLT Enhancement
• Multi-simulators support

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MMLT

• MMLT Enhancement
• Directory structure

MMLT ROOT
Applications
EPICS CA
Links
Machine
MML
Tracy (.so)?
Elegant(.so)?
AT
AT
Tracy
Elegant
NSLS2
S.R.
S.R.
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MMLT

• Command to select model

use at simulator by default setpathnsls2 use
tracy simulator setpathnsls2 tracy switch to
online switch2online
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MMLT

• Display (plotfamily)
• Beta plotting
• 
  (b) against AT
• (a) against Tracy-3

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MMLT

• Scripting Example Orbit Correction
• Refer to Greg Portmanns example EPICS Meeting
  April 27, 2005

Create an Orbit Error vcm .0005
randn(180,1) 180 vertical correctors at
the NSLS-II setsp('VCM', vcm) Get the
vertical orbit Y getam('BPMy') plot vertical
orbit figuresubplot(3,1,1)plot(Y) Get the
Vertical response matrix from the model Ry
getrespmat('BPMy', 'VCM') 180x180
matrix Computes the SVD of the response
matrix Ivec 124 U, S, V svd(Ry, 0)
Find the corrector changes use 48 singular
values DeltaAmps -V(,Ivec) S(Ivec,Ivec)-1
U(,Ivec)' Y Changes the corrector
strengths setsp('VCM', DeltaAmps) plot
residual orbit after one orbit-correction
iteration Y2 getam('BPMy')subplot(3,1,2)plot(Y
2) plot different between residual orbit and
original subplot(3,1,3) plot(Y-Y2,Y)
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MMLT

• Chromaticity measurement
• (a) against Tracy-3
  (b) against AT

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MMLT

• Beam based alignment
• against AT
  against Tracy-3

X
Y
X
Y
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Python

• Why python?
• Good scripting language
• Good interface with other language
• Good math libraries
• Good GUI libraries
• Platform Independent
• Open source, free license

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Python
Scripting Example Access simulation server via CA
!/usr/bin/python2.5 matplotlib is used for
plotting "Virtual Accelerator Orbit
Test" import sys from time import sleep from
pylab import Use ca library from
Diamond sys.path.append("./ca/build/lib")? from
dca import
System library
Channel access library
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