ICALEPCS2013 - List of Keywords (damping)

Paper	Title	Other Keywords	Page
THPPC033	Upgrade of BPM DAQ System for SuperKEKB Injector Linac	linac, emittance, electron, positron	1153
	M. Satoh, K. Furukawa, F. Miyahara, T. Suwada KEK, Ibaraki, Japan T. Kudou, S. Kusano Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
	The non-destructive beam position monitor (BPM) is indispensable diagnostic tool for the stable beam operation. In the KEK Linac, approximately nineteen BPMs with the strip-line type electrodes are used for the beam orbit measurement and feedback. In addition, some of them are also used for the beam energy feedback loops. The current data acquisition (DAQ) system consists of the fast digital oscilloscopes. A signal from each electrode is analyzed with a predetermined response function up to 50 Hz. In the present DAQ system, the measurement precision of beam position is limited to around 0.5 mm because of ADC resolution. Towards SuperKEKB project, we have a plan to upgrade the BPM DAQ system since the Linac should provide the smaller emittance beam in comparison with previous KEKB Linac. We will report the system description of the new DAQ system and the results of performance test in detail.

THPPC117	A Control Strategy for Highly Regulated Magnet Power Supplies Using a LQR Approach	controls, power-supply, simulation, proton	1334
	S. Srivastava, Y. Kumar, A. Misra, V.S. Pandit, S. Sahoo, S.K. Thakur VECC, Kolkata, India
	A linear quadratic regulator (LQR) based proportional-Integrator-derivative (PID) controller is proposed for the SMPS based magnet power supply of the high current proton injector operational at VECC. The state weighting matrices ‘Q’ of the LQR based controller is derived analytically using guaranteed dominant pole placement approach with desired ‘ζ’ (maximum overshoot) and ‘ω’(rise time). The uniqueness of this scheme is that the controller gives the desired closed loop response with minimum control effort, hence avoiding the actuator saturation by utilizing both optimum behavior of LQR technique and simplicity of the conventional PID controller. The controller and power supply parameter perturbations is studied along with the load disturbance to verify the robustness of proposed control mechanism.

FRCOBAB05	Distributed Feedback Loop Implementation in the RHIC Low Level RF Platform	cavity, LLRF, controls, FPGA	1501
	F. Severino, M. Harvey, T. Hayes, G. Narayan, K.S. Smith BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DEAC02-98CH10886 with the U.S. Department of Energy. We present a brief overview of distributed feedback systems based on the RHIC LLRF Platform. The general architecture and sub-system components of a complex feedback system are described, emphasizing the techniques and features employed to achieve deterministic and low latency data and timing delivery between local and remote sub-systems: processors, FPGA fabric components and the high level control system. In particular, we will describe how we make use of the platform to implement a widely distributed multi-processor and FPGA based longitudinal damping system, which relies on task sharing, tight synchronization and integration to achieve the desired functionality and performance.
	Slides FRCOBAB05 [3.147 MB]

Paper

Title

Other Keywords

Page

THPPC033

Upgrade of BPM DAQ System for SuperKEKB Injector Linac

linac, emittance, electron, positron

1153

M. Satoh, K. Furukawa, F. Miyahara, T. Suwada
KEK, Ibaraki, Japan
T. Kudou, S. Kusano
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan

The non-destructive beam position monitor (BPM) is indispensable diagnostic tool for the stable beam operation. In the KEK Linac, approximately nineteen BPMs with the strip-line type electrodes are used for the beam orbit measurement and feedback. In addition, some of them are also used for the beam energy feedback loops. The current data acquisition (DAQ) system consists of the fast digital oscilloscopes. A signal from each electrode is analyzed with a predetermined response function up to 50 Hz. In the present DAQ system, the measurement precision of beam position is limited to around 0.5 mm because of ADC resolution. Towards SuperKEKB project, we have a plan to upgrade the BPM DAQ system since the Linac should provide the smaller emittance beam in comparison with previous KEKB Linac. We will report the system description of the new DAQ system and the results of performance test in detail.

THPPC117

A Control Strategy for Highly Regulated Magnet Power Supplies Using a LQR Approach

controls, power-supply, simulation, proton

1334

S. Srivastava, Y. Kumar, A. Misra, V.S. Pandit, S. Sahoo, S.K. Thakur
VECC, Kolkata, India

A linear quadratic regulator (LQR) based proportional-Integrator-derivative (PID) controller is proposed for the SMPS based magnet power supply of the high current proton injector operational at VECC. The state weighting matrices ‘Q’ of the LQR based controller is derived analytically using guaranteed dominant pole placement approach with desired ‘ζ’ (maximum overshoot) and ‘ω’(rise time). The uniqueness of this scheme is that the controller gives the desired closed loop response with minimum control effort, hence avoiding the actuator saturation by utilizing both optimum behavior of LQR technique and simplicity of the conventional PID controller. The controller and power supply parameter perturbations is studied along with the load disturbance to verify the robustness of proposed control mechanism.

FRCOBAB05

Distributed Feedback Loop Implementation in the RHIC Low Level RF Platform

cavity, LLRF, controls, FPGA

1501

F. Severino, M. Harvey, T. Hayes, G. Narayan, K.S. Smith
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DEAC02-98CH10886 with the U.S. Department of Energy.
We present a brief overview of distributed feedback systems based on the RHIC LLRF Platform. The general architecture and sub-system components of a complex feedback system are described, emphasizing the techniques and features employed to achieve deterministic and low latency data and timing delivery between local and remote sub-systems: processors, FPGA fabric components and the high level control system. In particular, we will describe how we make use of the platform to implement a widely distributed multi-processor and FPGA based longitudinal damping system, which relies on task sharing, tight synchronization and integration to achieve the desired functionality and performance.

Slides FRCOBAB05 [3.147 MB]