PCaPAC2012 - List of Authors (Pandey, H.K.)

Paper

Title

Page

RF Distribution and Control System for Accelerators of the VEC-RIB Facility

184

H.K. Pandey, S. Basak, D.P. Dutta, T.K. Mandi
VECC, Kolkata, India
A. Kumar, K. P. Ray
SAMEER, Mumbai, India

RIB facility at VECC has several heavy ion linear accelerators like RFQ, two IH-LNACs and one buncher cavity operating at 37.8 MHz and two IH-LINACs with one buncher cavity at 75.6 MHz. Some more RF cavities are being designed at the third harmonic of 37.8 MHz and will be added in the RIB beam line. All the cavities have separate RF power amplifiers with proper amplitude, phase and resonance frequency tuning and control system for efficient and stable operation. The LLRF control system has been operational for the power amplifiers of the existing RF cavities and improved design and development is carried out. The main features of the RF control system are phase and amplitude control of the RF input to the amplifiers and tuning of the RF cavity to the desired resonant frequency with automation using feedback control. It will also have various interlocks for the safety of the load as well as the amplifier. A micro-controller based data acquisition and processing system is being used for control and local/remote operation. The RF distribution system as well as the design details of RF control system will be presented in this paper.

Poster THPD20 [2.163 MB]

THPD46

Simulation Analysis of Analog IQ based LLRF Control of RF Cavity

225

S. Basak, A. Chakrabarti, H.K. Pandey
VECC, Kolkata, India

This paper presents the simulation analysis and results in Matlab Simulink of the analog Inphase-Quadrature (IQ) based LLRF control of RF cavity voltage. The RF cavity parameters were selected to be one of the RF cavities in our RIB project. All the subsystems in the IQ based RF control were modeled using the Simulink blocks/components. The envelope simulation was carried out using the IQ model of RF cavity. The PI controller was properly tuned to achieve good control performance in time. The simulation graphs showing the time evolution of the RF cavity voltage with a step changes of the input reference signal is presented. The simulation graphs showing the control response time needed to correct a disturbance is presented. Further the effects of beam currents (if not ignored) on the cavity voltage can been studied through the simulation graphs. The simulation results showing the amplitude and phase Bode/Nichols plots of the control loop and the gain and phase margin values obtained from them are presented, which are good enough for stability. Thus the control simulation RF cavity voltage is done in Simulink and the results obtained are presented.

Poster THPD46 [0.222 MB]

THPD49

Design Considerations for Development of Distributed Data Acquisition and Control System (DDACS) for Radio-active Ion Beam (RIB) Facility

234

K. Mourougayane, A. Balasubramanian, G. Karna, P.S.P. Penilop
SAMEER, Chennai, India
D.P. Dutta, T.K.M. Mandi, H.K. Pandey
VECC, Kolkata, India

The RIB facility is equipped with state of the art systems, Linear Accelerators (LINACs), High current Magnetic sources, High Power RF Transmitters and associated High voltage and high current systems to produce and accelerate Radio Active Ion Beam. Developing a Data Acquisition and Control System for RIB facility need expertise on multiple domain covering Data Acquisition, Instrumentation, Control Systems to meet the functional requirements and Electromagnetic Compatibility (EMC) aspects of system design to ensure Electromagnetic Interference (EMI) free operation. SAMEER-Centre for Electromagnetics, Chennai collaborated with VECC in the Research and Development Project to develop all necessary hardware and Control System to monitor and control the RIB facility. Through this project, a unique system called 'Distributed Data Acquisition and Control System was designed and indigenously developed. The D-DACS systems are qualified for the functional, Electromagnetic Compatibility (EMC) requirements as per IEC standards. The design approach and techniques used in developing the customized D-DACS system for controlling and monitoring the RIB facility will be presented in this paper.

Poster THPD49 [2.218 MB]

Paper	Title	Page
THPD20	RF Distribution and Control System for Accelerators of the VEC-RIB Facility	184
	H.K. Pandey, S. Basak, D.P. Dutta, T.K. Mandi VECC, Kolkata, India A. Kumar, K. P. Ray SAMEER, Mumbai, India
	RIB facility at VECC has several heavy ion linear accelerators like RFQ, two IH-LNACs and one buncher cavity operating at 37.8 MHz and two IH-LINACs with one buncher cavity at 75.6 MHz. Some more RF cavities are being designed at the third harmonic of 37.8 MHz and will be added in the RIB beam line. All the cavities have separate RF power amplifiers with proper amplitude, phase and resonance frequency tuning and control system for efficient and stable operation. The LLRF control system has been operational for the power amplifiers of the existing RF cavities and improved design and development is carried out. The main features of the RF control system are phase and amplitude control of the RF input to the amplifiers and tuning of the RF cavity to the desired resonant frequency with automation using feedback control. It will also have various interlocks for the safety of the load as well as the amplifier. A micro-controller based data acquisition and processing system is being used for control and local/remote operation. The RF distribution system as well as the design details of RF control system will be presented in this paper.
	Poster THPD20 [2.163 MB]

THPD46	Simulation Analysis of Analog IQ based LLRF Control of RF Cavity	225
	S. Basak, A. Chakrabarti, H.K. Pandey VECC, Kolkata, India
	This paper presents the simulation analysis and results in Matlab Simulink of the analog Inphase-Quadrature (IQ) based LLRF control of RF cavity voltage. The RF cavity parameters were selected to be one of the RF cavities in our RIB project. All the subsystems in the IQ based RF control were modeled using the Simulink blocks/components. The envelope simulation was carried out using the IQ model of RF cavity. The PI controller was properly tuned to achieve good control performance in time. The simulation graphs showing the time evolution of the RF cavity voltage with a step changes of the input reference signal is presented. The simulation graphs showing the control response time needed to correct a disturbance is presented. Further the effects of beam currents (if not ignored) on the cavity voltage can been studied through the simulation graphs. The simulation results showing the amplitude and phase Bode/Nichols plots of the control loop and the gain and phase margin values obtained from them are presented, which are good enough for stability. Thus the control simulation RF cavity voltage is done in Simulink and the results obtained are presented.
	Poster THPD46 [0.222 MB]

THPD49	Design Considerations for Development of Distributed Data Acquisition and Control System (DDACS) for Radio-active Ion Beam (RIB) Facility	234
	K. Mourougayane, A. Balasubramanian, G. Karna, P.S.P. Penilop SAMEER, Chennai, India D.P. Dutta, T.K.M. Mandi, H.K. Pandey VECC, Kolkata, India
	The RIB facility is equipped with state of the art systems, Linear Accelerators (LINACs), High current Magnetic sources, High Power RF Transmitters and associated High voltage and high current systems to produce and accelerate Radio Active Ion Beam. Developing a Data Acquisition and Control System for RIB facility need expertise on multiple domain covering Data Acquisition, Instrumentation, Control Systems to meet the functional requirements and Electromagnetic Compatibility (EMC) aspects of system design to ensure Electromagnetic Interference (EMI) free operation. SAMEER-Centre for Electromagnetics, Chennai collaborated with VECC in the Research and Development Project to develop all necessary hardware and Control System to monitor and control the RIB facility. Through this project, a unique system called 'Distributed Data Acquisition and Control System was designed and indigenously developed. The D-DACS systems are qualified for the functional, Electromagnetic Compatibility (EMC) requirements as per IEC standards. The design approach and techniques used in developing the customized D-DACS system for controlling and monitoring the RIB facility will be presented in this paper.
	Poster THPD49 [2.218 MB]