1. P. K. Srivastava and LVPD Team* (Abstract ID:013)
Process Automation System for Integration and Operation of Large Volume Plasma Device
P. K. Srivastava and LVPD Team* (Abstract ID:013)
*LVPD Team: Ritesh Sugandhi, A.K.Sanyasi, Prabhakar Srivastava, L. M. Awasthi,
R. Jha, S. K. Mattoo and P. K. Kaw
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2. 10th IAEA conference on data acquisition and control system
Plan of Talk
Motivation
Large volume plasma device
Introduction
Operation cycle
Scope for automation
Automation process
Process artefacts –
Operational logic preparation, Instrumentation models development
Interface : Hardware and software
LabVIEW as SCADA
Results
Conclusion
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3. 10th IAEA conference on data acquisition and control system
Motivation
Process automation: Critical for Plasma Physics Experiments
Complex systems with multiple inter subsystem dependencies
System distributed over large area
Process & Time criticality
Fault identification and trouble shooting
Sequential as well parallel operations
Complex interlocks
Enforcing operational limits
Real time feedback & control
System and Human Safety
Data Management
Few working examples are as follows:
Linear Machines
VINETA
LAPD
CLM
Tokamaks
JET
Tore Supra
Aditya & SST -1
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4. Large Volume Plasma Device
EEF
LVPD
DAQ
Ch. Disp.
Experimental Chamber
Auxiliary Power systems
Data acquisition
SS 316 Double walled Cylinder
Magnet Power Supply
16 Channel VXI / 40 PXI
Length - 3m
Timer Card
Filament Power Supply
Diameter – 2m
5 Delay trigger Cards
Discharge Power Supply
Diagnostics Ports – 94 Nos
Probe drive controls
Filter Power Supply
Experimental Regime
Plasma Operation Control
Exciters/ Pulsing Supply
Ultimate vacuum ~ 2 x 10-6mbar
Neutral Gas feed system
Uninterrupted Power Supply
Working vacuum ~ 4 x 10-4mbar
Probe positioning system
Environment 99.99% Argon gas
Vacuum and Other Auxiliary system
Confinement (DC and Pulsed)
Multi filamentary, W, Cathode
Plasma density ~1011 /cc
Cathode Heating (Electrical)
Hydraulics & Pneumatics
duty cycle (Pulsed)
Plasma Discharge control
Cryogenics
1 Hz repetition rate
EEF magnetic field control
Water cooling
Axial magnetic field up to 150 G
Safety interlocks like temperature,
Vacuum, cooling, Flow e.t.c
EEF magnetic field up to 250 G
Air conditioning
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5. Large Volume Plasma Device
Physics studies
Up gradation is underway
Electron Temperature Gradient (ETG) driven Turbulence
Automation towards Single window operation of the LVPD experiment.
Vacuum operation
Plasma Transport: Relevance to fusion Devices
Power supplies operation
Understanding Electro - Magnetic Filter Physics
Linear Probe drives with Stepper motors based operation, etc
Exploring Active ETG experiments in LVPD
Up gradation to new PXIe based DAQ with 40 channels
Understanding role of energetic electrons in the physical processes involved in Magnetospheric plasma, Solar flares etc.
Enhancement of Plasma discharge period from 10ms - 50 ms
Enhancement of EEF pulse width from 15ms to 55 ms.
Role of magnetic filter in production of – ve (H-) ions in a plasma.
Up gradation to high density (1012/cm3) uniform plasma source.
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6. 10th IAEA conference on data acquisition and control system
LVPD Operation Cycle:
Data flow diagram
Describing the simulated end to end data flow model of operation of the machine
Describing the simulated end to end data flow model of operation of LVPD.
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7. Scope of automation (1/2)
Approach:
Automate the new technical subsystems starting from its development
Up-gradation of the manual controls and interlock to computerized control
Apply standardized protocols & conventions and A Graphical User Interface (GUI)
Scope
Proof of concept:
Automation of new Filament Power Supply (20V/10kA) and Linear Probe Drive System (12 No's)
Use of standard Process Modelling Techniques and Instrumentation Models
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8. Scope of automation (2/2)
Interlock
Subsystem level interlocks e.g. Operating limits and conditions for probe drive movement
System level interlock e.g. Filament PS and vacuum system interlock
Emergency stop
Safety
User level safety
Machine level safety by hardwired interlocks
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9. 10th IAEA conference on data acquisition and control system
Logic Development
(Vacuum System)
Static Modeling : Unified modelling language (ISO UML v1.4) is used for representation of state, activity and sequence
Dynamic Modeling describing system behaviour are simulated using Scicos toolkit of Scilab
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10. Simulation and Verification
Describes the vacuum pumping system model and plot of simulation as well as experimentally measured pressure profile.
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11. Instrumentation Diagrams
Instrumentation models (P&ID, PFD and Electrical diagram, one line diagram) inline with standard guidelines and symbols as per ISA (2009) and ISO Standards.
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12. Programmable Controller Interface
Selection of multi-drop serial RS485 interface
Semi autonomous operation
Each subsystem has a embedded controller (or PLC) program to locally control the unit and respond to a centralized master controller.
Modbus communication protocol:
Open source, standardized and portable software interface , request-reply mode of operation, 1 master and up to 247 addressable slaves
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13. Software Communication Interface
Packet Data Format
MODBUS RTU binary command format is used as a communication packet and Standard register mapping schema is finalized.
Commands
Read Holding register command is used for reading of status data and Write Holding register command is used for setting controls.
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14. LabVIEW for Automation
LabVIEW is used as a development platform for machine automation and control.
Reasons for selections are:
Graphical programming environment
Data flow programming
User and Logic integration under same toolkit
Data Analysis and field bus interface
In-house campus license and support available
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15. Modbus Library Functions
Implementation function block for modbus master and slave functionality
Used for development of test applications and interface simulators.
Open source and easy portability across LabVIEW
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16. 10th IAEA conference on data acquisition and control system
Results
LabVIEW based Filament Power Supply Graphical User Interface
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17. Graphical Programming
Implemented event driven program in LabVIEW
Describes initialize -> read/write -> data processing -> logging blocks
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18. Linear Probe Drive Comm. Test Application
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19. Status and Work in Progress
As a proof of concept, following systems are automated:
Linear Probe Drive (~ 1m travel length) control for 12 drives
20V/ 10kA Filament Power Supply System
Market survey done and procurement will be started for automation of other systems and subsystems.
The current test applications functionalities will be enhanced in terms of data processing and full phased SCADA system will be implemented using data logging and supervisory module of LabVIEW.
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20. Thank you for your kind attention !!!
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