ICALEPCS2013 - List of Keywords (proton)

Paper	Title	Other Keywords	Page
MOMIB06	Personnel Protection of the CERN SPS North Hall in Fixed Target Primary Ion Mode	ion, extraction, PLC, target	66
	T. Hakulinen, J. Axensalva, F. Havart, S.C. Hutchins, L.K. Jensen, D. Manglunki, P. Ninin, P. Odier, S.B. Reignier, J.P. Ridewood, L. Søby, C. Theis, F. Valentini, D. Vaxelaire, H. Vincke CERN, Geneva, Switzerland
	While CERN's Super Proton Synchrotron (SPS) is able to deliver both secondary proton and primary ion beams to fixed targets in the North Area, the experimental areas (North Hall) are widely accessible during beam. In ion mode all normal safety elements involved in producing secondary beams are removed, so that an accidental extraction of a high-intensity proton beam into the North Hall would expose personnel present there to a radiation hazard. This has required an injector reconfiguration restricting operation to either ions or protons. However, demands for operational flexibility of CERN accelerators have led to a need to mix within the same SPS super-cycle both high-intensity proton cycles for LHC or HiRadMat and ion cycles for the North Area. We present an active interlock designed to mitigate this hazard: Beam Current Transformers are used to measure the level of beam intensity, and if above a set threshold, pulsing of the extraction septa is vetoed. The safety function is implemented by means of two logically equivalent but diverse and separate interlock chains. This interlock is expected to be in place once the SPS resumes operation after the first Long Shutdown in 2014.
	Slides MOMIB06 [0.236 MB]
	Poster MOMIB06 [4.250 MB]

THPPC117	A Control Strategy for Highly Regulated Magnet Power Supplies Using a LQR Approach	controls, power-supply, damping, simulation	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.

THPPC123	Online Luminosity Optimization at the LHC	luminosity, experiment, controls, target	1351
	F. Follin, R. Alemany-Fernandez, R. Jacobsson CERN, Geneva, Switzerland
	The online luminosity control of the LHC experiments consists of an automatic slow real-time feedback system controlled by a specific experiment software that communicates directly with an LHC application. The LHC application drives a set of corrector magnets to adjust the transversal beam overlap at the interaction point in order to keep the instantaneous luminosity aligned to the target luminosity provided by the experiment. This solution was proposed by the LHCb experiment and tested first in July 2010. It has been in routine operation during the first two years of physics luminosity data taking, 2011 and 2012, in LHCb. It was also adopted for the ALICE experiment during 2011. The experience provides an important basis for the potential future need of levelling the luminosity in all the LHC experiments. This paper describes the implementation of the LHC application controlling the luminosity at the experiments and the information exchanged that allows this automatic control.
	Poster THPPC123 [1.344 MB]

Paper

Title

Other Keywords

Page

MOMIB06

Personnel Protection of the CERN SPS North Hall in Fixed Target Primary Ion Mode

ion, extraction, PLC, target

66

T. Hakulinen, J. Axensalva, F. Havart, S.C. Hutchins, L.K. Jensen, D. Manglunki, P. Ninin, P. Odier, S.B. Reignier, J.P. Ridewood, L. Søby, C. Theis, F. Valentini, D. Vaxelaire, H. Vincke
CERN, Geneva, Switzerland

While CERN's Super Proton Synchrotron (SPS) is able to deliver both secondary proton and primary ion beams to fixed targets in the North Area, the experimental areas (North Hall) are widely accessible during beam. In ion mode all normal safety elements involved in producing secondary beams are removed, so that an accidental extraction of a high-intensity proton beam into the North Hall would expose personnel present there to a radiation hazard. This has required an injector reconfiguration restricting operation to either ions or protons. However, demands for operational flexibility of CERN accelerators have led to a need to mix within the same SPS super-cycle both high-intensity proton cycles for LHC or HiRadMat and ion cycles for the North Area. We present an active interlock designed to mitigate this hazard: Beam Current Transformers are used to measure the level of beam intensity, and if above a set threshold, pulsing of the extraction septa is vetoed. The safety function is implemented by means of two logically equivalent but diverse and separate interlock chains. This interlock is expected to be in place once the SPS resumes operation after the first Long Shutdown in 2014.

Slides MOMIB06 [0.236 MB]

Poster MOMIB06 [4.250 MB]

THPPC117

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

controls, power-supply, damping, simulation

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.

THPPC123

Online Luminosity Optimization at the LHC

luminosity, experiment, controls, target

1351

F. Follin, R. Alemany-Fernandez, R. Jacobsson
CERN, Geneva, Switzerland

The online luminosity control of the LHC experiments consists of an automatic slow real-time feedback system controlled by a specific experiment software that communicates directly with an LHC application. The LHC application drives a set of corrector magnets to adjust the transversal beam overlap at the interaction point in order to keep the instantaneous luminosity aligned to the target luminosity provided by the experiment. This solution was proposed by the LHCb experiment and tested first in July 2010. It has been in routine operation during the first two years of physics luminosity data taking, 2011 and 2012, in LHCb. It was also adopted for the ALICE experiment during 2011. The experience provides an important basis for the potential future need of levelling the luminosity in all the LHC experiments. This paper describes the implementation of the LHC application controlling the luminosity at the experiments and the information exchanged that allows this automatic control.

Poster THPPC123 [1.344 MB]