PCaPAC2012 - List of Authors (Mittal, K.C.)

Paper

Title

Page

PLC-based Control System for 10 MeV Linear Accelerator at EBC Kharghar, BARC

100

A.S. Chachondia, B.B. Biswas, D.P. Chakravarthy, G. Ganesh, L.M. Gantayet, K.C. Mittal, M.K. Mukesh Kumar, M.B. Patil, R.K. Patil
BARC, Mumbai, India

Currently the 10MeV Linac is being used for different research applications and industrial use. The control system in operation was developed using CAMAC based DAS, backed by Hard-wired Interlock System. It is proposed to replace the CAMAC system with a state-of-the-art indigenously developed PLC that is verified to the level of a Class IB computer-based system used in nuclear power plants. A PLC node comprises of two VME bus based CPU boards (PowerPC MPC7447, 600MHz) working in redundant mode. The Inputs and Outputs are common to both CPUs. The intelligent I/O boards are hot swappable. The PLC hardware and software has undergone rigorous verification and validation. A user-friendly development environment is provided to the process engineer for building the application using pre-defined function blocks. The LCS developed using PLC is to be used for operating the Linac irradiation facility, remotely as well as locally in a fail-safe mode, with sequential start-up and sequential shut-down. Apart from system status monitoring, data archiving, alarm generation and setpoint adjustments, it shall monitor the important parameters and trip the GM HV, KM HV and EG PS on fault conditions.

Slides THCA05 [0.497 MB]

THPD03

PLC Controlled Search & Secure Safety Interlock System for Accelerator

142

V. Sharma, S. Acharya, S. Gond, K.C. Mittal, R.N. Rajan
BARC, Mumbai, India

PLC based search and scram system is designed and commissioned to ensure the accelerator cell being free from any human occupancy before we start the accelerator. Search and Scram units which are controlled by PLC have been installed at different places inside the cell area. The operator of the accelerator has to clear all the units by pressing the secure button. Clearing each of the unit and pressing the button ensures that there is nobody left inside the cell after all the units are cleared. If someone remains trapped inside cell even after search and secure operation successfully performed, he can press any emergency button located on each of the Scram unit to switch off the accelerator immediately. The operation is time limited so if the operator fails to do the search operation in time, the entire system will get tripped and will require to the operator to do the entire operation again. This system generates HV ON enable signal. If any of the door is opened or Scram is pressed the HV supply switches off and radiation ceases off immediately. This system has the merit that it offers timing and sequence flexibility but retains the safety merit of hard wired circuit.

Poster THPD03 [0.571 MB]

THPD04

Machine Throughput Improvement Achieved Using Innovative Control Technique

144

V. Sharma, S. Acharya, K.C. Mittal
BARC, Mumbai, India

Funding: BARC, Mumbai
A 10MeV, Electron beam, RF Linac is operational at EBC, Kharghar, Navi Mumbai. The beam output scans one meter length in a scan horn. The product under irradiation is placed in a conveyor trolley where trolley is one meter long and one meter gap between the trolleys. With the constant speed of 5mtrs/min operation of trolley, the dose utilization is 50% since the beam falls in the gap between the trolleys. We have modulated the speed as 5mtrs./min when trolley gap is under the beam and 0.1 mtrs./min when trolley is under the beam. This way the beam utilization for the irradiation goes up to 98% hence 48% rise in productivity. A 20kV 10KJ Electromagnetic machining (EMM) facility is developed by APPD/BARC. In this EMM facility a large value capacitor is charged by a DC supply to a constant voltage. This charged capacitor is then discharged using triggered spark gap into a coil to generate intense magnetic field. This magnetic field generates the eddy current into the job piece to do the forming. We have used a PLC based control system to control the machine.

Poster THPD04 [0.341 MB]

THPD43

Electron Cyclotron Resonance Ion Source Control System

217

H.M. Kewlani, D.P. Chakravarthy, S. Gharat, L. Mishra, K.C. Mittal, P. Roychowdhury
BARC, Mumbai, India

The control system of Electron Cyclotron Resonance (ECR) ion source is computer based control system. Main components of ECR ion source are microwave generator, plasma chamber, solenoid magnets, high current power supplies, extraction electrodes, high voltage power supplies, beam measuring devices and vacuum system. All the electronics devices have their built in microprocessor base electronic interface, which can be remotely accessed by serial or Ethernet link. Two numbers of Ethernet to four port serial converter modules are used to extend the serial interface capabilities of computer. Serial interface of all the devices are connected to the extended serial ports of the computer. Serial link of high voltage power supplies are optically isolated using optical isolators to overcome EMI and EMC problems. Software has been developed in house for remote operation of the ECR ion source electronic devices like magnetron power supply, high voltage power supplies, high current power supplies, microwave power measurement and vacuum gauges.

Poster THPD43 [0.254 MB]

THPD45

Overview of Control System for 30MeV RF Source

222

R.B. Chavan, S. Chandan, K. Dixit, K.C. Mittal, A.R. Tillu, V. Yadav
BARC, Mumbai, India

Control system for RF source of 30 MeV, 3 kW RF Linac for neutron generation is being developed. The system consists of two 15 MeV linac structures, each powered independently with klystron rated for 7.5 MW(pk)/7.5 kW(avg). Two klystron modulators of 160kV, 110A, 7usec and 250Hz feed pulsed power into the klystron, which produces RF power at 2856 MHz. The klystrons will be driven by low power RF driver amplifiers programmed for matching phase, frequency and power into the linac. Both the driver amplifiers are controlled through RS-232 Protocol. The HV pulsing and RF drive for the klystron has been interlocked with water flow, arc detector, SF6 gas pressure etc. The control system is designed using Real time embedded controller, where pulses for synchronization are being generated in FPGA. Most of the power supplies like electromagnet, HVDC, etc. are on RS-232 protocol. These power supplies are controlled via suitable RS-232 to Ethernet converter. State machine topology is being used to design the logic. The database for logging data is developed in SQL. This paper describes the details of the software implementation and hardware used to realize the control of the RF power source.

Poster THPD45 [2.248 MB]

Paper	Title	Page
THCA05	PLC-based Control System for 10 MeV Linear Accelerator at EBC Kharghar, BARC	100
	A.S. Chachondia, B.B. Biswas, D.P. Chakravarthy, G. Ganesh, L.M. Gantayet, K.C. Mittal, M.K. Mukesh Kumar, M.B. Patil, R.K. Patil BARC, Mumbai, India
	Currently the 10MeV Linac is being used for different research applications and industrial use. The control system in operation was developed using CAMAC based DAS, backed by Hard-wired Interlock System. It is proposed to replace the CAMAC system with a state-of-the-art indigenously developed PLC that is verified to the level of a Class IB computer-based system used in nuclear power plants. A PLC node comprises of two VME bus based CPU boards (PowerPC MPC7447, 600MHz) working in redundant mode. The Inputs and Outputs are common to both CPUs. The intelligent I/O boards are hot swappable. The PLC hardware and software has undergone rigorous verification and validation. A user-friendly development environment is provided to the process engineer for building the application using pre-defined function blocks. The LCS developed using PLC is to be used for operating the Linac irradiation facility, remotely as well as locally in a fail-safe mode, with sequential start-up and sequential shut-down. Apart from system status monitoring, data archiving, alarm generation and setpoint adjustments, it shall monitor the important parameters and trip the GM HV, KM HV and EG PS on fault conditions.
	Slides THCA05 [0.497 MB]

THPD03	PLC Controlled Search & Secure Safety Interlock System for Accelerator	142
	V. Sharma, S. Acharya, S. Gond, K.C. Mittal, R.N. Rajan BARC, Mumbai, India
	PLC based search and scram system is designed and commissioned to ensure the accelerator cell being free from any human occupancy before we start the accelerator. Search and Scram units which are controlled by PLC have been installed at different places inside the cell area. The operator of the accelerator has to clear all the units by pressing the secure button. Clearing each of the unit and pressing the button ensures that there is nobody left inside the cell after all the units are cleared. If someone remains trapped inside cell even after search and secure operation successfully performed, he can press any emergency button located on each of the Scram unit to switch off the accelerator immediately. The operation is time limited so if the operator fails to do the search operation in time, the entire system will get tripped and will require to the operator to do the entire operation again. This system generates HV ON enable signal. If any of the door is opened or Scram is pressed the HV supply switches off and radiation ceases off immediately. This system has the merit that it offers timing and sequence flexibility but retains the safety merit of hard wired circuit.
	Poster THPD03 [0.571 MB]

THPD04	Machine Throughput Improvement Achieved Using Innovative Control Technique	144
	V. Sharma, S. Acharya, K.C. Mittal BARC, Mumbai, India
	Funding: BARC, Mumbai A 10MeV, Electron beam, RF Linac is operational at EBC, Kharghar, Navi Mumbai. The beam output scans one meter length in a scan horn. The product under irradiation is placed in a conveyor trolley where trolley is one meter long and one meter gap between the trolleys. With the constant speed of 5mtrs/min operation of trolley, the dose utilization is 50% since the beam falls in the gap between the trolleys. We have modulated the speed as 5mtrs./min when trolley gap is under the beam and 0.1 mtrs./min when trolley is under the beam. This way the beam utilization for the irradiation goes up to 98% hence 48% rise in productivity. A 20kV 10KJ Electromagnetic machining (EMM) facility is developed by APPD/BARC. In this EMM facility a large value capacitor is charged by a DC supply to a constant voltage. This charged capacitor is then discharged using triggered spark gap into a coil to generate intense magnetic field. This magnetic field generates the eddy current into the job piece to do the forming. We have used a PLC based control system to control the machine.
	Poster THPD04 [0.341 MB]

THPD43	Electron Cyclotron Resonance Ion Source Control System	217
	H.M. Kewlani, D.P. Chakravarthy, S. Gharat, L. Mishra, K.C. Mittal, P. Roychowdhury BARC, Mumbai, India
	The control system of Electron Cyclotron Resonance (ECR) ion source is computer based control system. Main components of ECR ion source are microwave generator, plasma chamber, solenoid magnets, high current power supplies, extraction electrodes, high voltage power supplies, beam measuring devices and vacuum system. All the electronics devices have their built in microprocessor base electronic interface, which can be remotely accessed by serial or Ethernet link. Two numbers of Ethernet to four port serial converter modules are used to extend the serial interface capabilities of computer. Serial interface of all the devices are connected to the extended serial ports of the computer. Serial link of high voltage power supplies are optically isolated using optical isolators to overcome EMI and EMC problems. Software has been developed in house for remote operation of the ECR ion source electronic devices like magnetron power supply, high voltage power supplies, high current power supplies, microwave power measurement and vacuum gauges.
	Poster THPD43 [0.254 MB]

THPD45	Overview of Control System for 30MeV RF Source	222
	R.B. Chavan, S. Chandan, K. Dixit, K.C. Mittal, A.R. Tillu, V. Yadav BARC, Mumbai, India
	Control system for RF source of 30 MeV, 3 kW RF Linac for neutron generation is being developed. The system consists of two 15 MeV linac structures, each powered independently with klystron rated for 7.5 MW(pk)/7.5 kW(avg). Two klystron modulators of 160kV, 110A, 7usec and 250Hz feed pulsed power into the klystron, which produces RF power at 2856 MHz. The klystrons will be driven by low power RF driver amplifiers programmed for matching phase, frequency and power into the linac. Both the driver amplifiers are controlled through RS-232 Protocol. The HV pulsing and RF drive for the klystron has been interlocked with water flow, arc detector, SF6 gas pressure etc. The control system is designed using Real time embedded controller, where pulses for synchronization are being generated in FPGA. Most of the power supplies like electromagnet, HVDC, etc. are on RS-232 protocol. These power supplies are controlled via suitable RS-232 to Ethernet converter. State machine topology is being used to design the logic. The database for logging data is developed in SQL. This paper describes the details of the software implementation and hardware used to realize the control of the RF power source.
	Poster THPD45 [2.248 MB]