PCaPAC2012 - List of Keywords (pick-up)

Paper	Title	Other Keywords	Page
THPD05	Design and Analysis of Second Harmonics Modulator for DC Current Transformer	feedback, controls, instrumentation, factory	145
	K.D. Joshi, K. Reju BARC, Mumbai, India
	DC Current Transformers (DCCT) are widely used in the world of particle accelerators. DCCT is a device which produces even harmonics, predominantly second harmonics corresponding to DC beam current flowing through two toroids. The second harmonics is detected by digital synchronous detector implemented in programmable logic. Current proportional to the detected second harmonic is passed through the toroids in a feedback loop such that the flux due to the DC beam current is cancelled by it. This feedback current is the measure of average beam current. The high permeability toroids, excitation and output windings are collectively called magnetic modulator, which is a key component of DCCT. Design and analysis of a second-harmonic magnetic modulator used as a detector for DC Current transformer for high resolution current measurement is presented.
	Poster THPD05 [0.498 MB]

THPD50	FPGA Based Amplitude Control System for Accelerating Cavities	cavity, controls, simulation, low-level-rf	239
	M.S. Dey, S. Ghosh, A. Mandal, S. Seth, A. Singh, S.S. Som VECC, Kolkata, India
	The FPGA (Field Programmable Gate Array) based digital controller has been implemented for Low level RF voltage control of a 650 MHz cavity. The flexibility of implementing any appropriate control strategy and to have a compact single board solution, FPGA is chosen. The superconducting Cavity is designed to be operated at 650 MHz and 30 kW, CW mode. The voltage from pick-up coil has been fed to the controller after down conversion. The signal is digitized using high speed ADCs. The controller has been tested with different set points and gain parameters from a software connected to the board with serial interface. The FPGA signal processing has been verified according to the required strategy of the reference controller. Some experimental results have been presented for different cavity operational conditions.
	Poster THPD50 [0.613 MB]

FRCC02	A FPGA Based High Speed Data Acquisition Card	LLRF, controls, cavity, heavy-ion	271
	J.A. Gore, P. V. Bhagwat, A. Chatterjee, S. Kailas, S. Kulkarni, K. Mahata, S.K. Pandit, V.V. Parkar, A. Shrivastava BARC, Mumbai, India
	Funding: Bhabha Atomic Research Centre, Nuclear Physics Division A FPGA based, high speed,two channel,analog input card with a maximum input sampling rate of 1 Giga samples per second (Gsps)per channel has been designed and tested. The card has got an on-board cPCI interface but has been designed in a way that it can also work as a stand-alone system. The card can function as a platform for developing and evaluating different FPGA based hardware designs. Recently, the card has been used to develop a direct sampling Low Level RF (LLRF) controller for controlling the electromagnetic fields of a prototype heavy ion RFQ. It has also been tested for acquisition of data in nuclear physics experiments. Pulses from surface barrier and silicon strip detectors were acquired at an input sampling rate of 1 Gs/s employing ²⁴¹Am and Am-Pu sources. The design developed for this makes use of pre-triggering. This paper discusses the functionality, salient design issues and features of the card. Finally the hardware designs of above mentioned applications related to different areas of LLRF control and nuclear pulse acquisition are explained and the results obtained are presented.
	Slides FRCC02 [1.431 MB]

Paper

Title

Other Keywords

Page

THPD05

Design and Analysis of Second Harmonics Modulator for DC Current Transformer

feedback, controls, instrumentation, factory

145

K.D. Joshi, K. Reju
BARC, Mumbai, India

DC Current Transformers (DCCT) are widely used in the world of particle accelerators. DCCT is a device which produces even harmonics, predominantly second harmonics corresponding to DC beam current flowing through two toroids. The second harmonics is detected by digital synchronous detector implemented in programmable logic. Current proportional to the detected second harmonic is passed through the toroids in a feedback loop such that the flux due to the DC beam current is cancelled by it. This feedback current is the measure of average beam current. The high permeability toroids, excitation and output windings are collectively called magnetic modulator, which is a key component of DCCT. Design and analysis of a second-harmonic magnetic modulator used as a detector for DC Current transformer for high resolution current measurement is presented.

Poster THPD05 [0.498 MB]

THPD50

FPGA Based Amplitude Control System for Accelerating Cavities

cavity, controls, simulation, low-level-rf

239

M.S. Dey, S. Ghosh, A. Mandal, S. Seth, A. Singh, S.S. Som
VECC, Kolkata, India

The FPGA (Field Programmable Gate Array) based digital controller has been implemented for Low level RF voltage control of a 650 MHz cavity. The flexibility of implementing any appropriate control strategy and to have a compact single board solution, FPGA is chosen. The superconducting Cavity is designed to be operated at 650 MHz and 30 kW, CW mode. The voltage from pick-up coil has been fed to the controller after down conversion. The signal is digitized using high speed ADCs. The controller has been tested with different set points and gain parameters from a software connected to the board with serial interface. The FPGA signal processing has been verified according to the required strategy of the reference controller. Some experimental results have been presented for different cavity operational conditions.

Poster THPD50 [0.613 MB]

FRCC02

A FPGA Based High Speed Data Acquisition Card

LLRF, controls, cavity, heavy-ion

271

J.A. Gore, P. V. Bhagwat, A. Chatterjee, S. Kailas, S. Kulkarni, K. Mahata, S.K. Pandit, V.V. Parkar, A. Shrivastava
BARC, Mumbai, India

Funding: Bhabha Atomic Research Centre, Nuclear Physics Division
A FPGA based, high speed,two channel,analog input card with a maximum input sampling rate of 1 Giga samples per second (Gsps)per channel has been designed and tested. The card has got an on-board cPCI interface but has been designed in a way that it can also work as a stand-alone system. The card can function as a platform for developing and evaluating different FPGA based hardware designs. Recently, the card has been used to develop a direct sampling Low Level RF (LLRF) controller for controlling the electromagnetic fields of a prototype heavy ion RFQ. It has also been tested for acquisition of data in nuclear physics experiments. Pulses from surface barrier and silicon strip detectors were acquired at an input sampling rate of 1 Gs/s employing ²⁴¹Am and Am-Pu sources. The design developed for this makes use of pre-triggering. This paper discusses the functionality, salient design issues and features of the card. Finally the hardware designs of above mentioned applications related to different areas of LLRF control and nuclear pulse acquisition are explained and the results obtained are presented.

Slides FRCC02 [1.431 MB]