INSTRUMENTATION ARCHITECTURE FOR ITER DIAGNOSTIC NEUTRAL BEAM POWER SUPPLY SYSTEM
A. Thakar, H. Dhola, R. Dave, N.P. Singh, B. Raval, D. Parmar, A. Patel, S. Gajjar, V. Gupta, U. Baruah,ITER-India, IPR, Gandhinagar, India
L. Svensson, J.Y. Journeaux, D. Lathi, B. Schunke ITER Organisation, St Paul Lez Durance, France
Abstract
A Neutral Beam (NB) Injection system is used for heating or diagnostics of the plasma in a Tokamak. The Diagnostics Neutral Beam (DNB) system for ITER (International Thermonuclear Experimental Reactor) based on acceleration of negative ions; injects a neutral (H˳) beam at 100keV with specified modulation into the plasma for charge exchange recombination spectroscopy. DNB Power Supply (DNBPS) system consists of various high voltage power supplies, high current power supplies and RF Generators. The system operates in a given operating sequence; very high electromagnetic transients are intrinsically generated during frequent short circuit at the accelerator grid (breakdowns) and sudden loss of load (Beam off).
Instrumentation is to be provided to operate the DNBPS system remotely with required control and protection in synchronisation with ITER operation as directed by CODAC (COntrol Data Access and Communication); the central control system for ITER. Instrumentation functionality includes 1.Operation and control of DNBPS
subsystems and associated auxiliaries 2.Protection of DNB components and power supplies using interlock system, 3.To ensure safe operation of high voltage hazardous systems 4. Acquisition of injector performance parameters and 5.To facilitate test and maintenance of individual subsystem.
This paper discusses about proposed DNBPS instrumentation architecture. The design generally follows the protocols from the ITER- Plant Control Design Handbook (PCDH).
INTRODUCTION The DNB P ower S upply s ystem [ 1,2, ] f eeds the required
controllable electrical power to the DNB beam source (BS), the Residual Ion Dump (RID) and the Active Correction and Compensation coils (ACCC). The system comprises of various high voltage, High Current power supplies and RF generators for plasma generation in the ion source, with integrated controllers.
Table 1: DNBPS Main Subsystems, their control, monitoring and protection parameters
Sub Systems Controlling parameter
Measurements Protection events
Acceleration Grid PS (AGPS)
96kV, 75A
Voltage, Modulation
Voltage, Current, Cooling water parameters
Breakdown, Beam off, Failure in RID voltage, Short circuit at power supply end
Extractor Grid Power Supply (EGPS)
12kV, 140A
Voltage, Modulation
Voltage, Current , Cooling water parameters
Breakdown, Beam off, Short circuit at power supply end
Residual Ion Dump Power supply (RIDPS)
8kV, 60A
Voltage, Operation time
Voltage, Current, Cooling water parameters
Short circuit
RF Generators
4 X 200kW
Frequency, RF power, Modulation
Frequency, Phase, Power, Cooling water parameters
Break down, Beam off (Reduce RF power to notch level)
Active Correction Coil Power Supply (ACCPS)
1.4kV, 440A
Current Current, Magnetic field around DNB cell, Cooling water parameters
Short circuit protection
Plasma Grid Bias Power Supply ; 30V, 600A
Current, Voltage
Current, Voltage, Cooling water parameters
Short circuit protection
Plasma Grid Filter Power Supply;15V, 4kA
Current, Voltage
Current, Voltage, Cooling water parameters
Short circuit protection
Cs oven Shutter control, Temperature
Temperature -
THPD40 Proceedings of PCaPAC2012, Kolkata, India
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Proceedings of PCaPAC2012, Kolkata, India THPD40
Status Report/Overview of Control System
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REFERENh et. al, Status Nucl. Fusion 49son et.al, Instrutral Beam Syste11).
control layer S with Linux controllers areve the DNBshall be sent
oller may comtection signa
nterface with C
cted to CODAand PSH/DNB
other throue with Remo
ay be needed wPS Controlleroller and log tte slow controslow control
directly unis a slave
ller transfeer. ISEPS co
her PS systemby ISEPS conh DNBPS conation shall benchronous opes. s shall be mint contact;
NCES of the ITER h
9 (2009). umentation and em, Fusion E
run CODACPlatform like
e PLCs. PS controllert by CODACmmunicate toal and other
CODAC.
AC directly orBPS controllerugh standardote I/Os with
with each subcan observe
the data. PSHoller. PSH hasllers & fast
nder DNBPSof DNBPS
rs CODAController then
m accordingly.ntroller can bentroller. Somee provided toeration during
monitored byi.e. DNBPS
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THPD40 Proceedings of PCaPAC2012, Kolkata, India
ISBN 978-3-95450-124-3
216Cop
yrig
htc ○
2012
byth
ere
spec
tive
auth
ors
Status Report/Overview of Control System
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