DIPAC2011 - List of Keywords (EPICS)

Paper	Title	Other Keywords	Page
MOOC02	Cavity BPM System for ATF2	cavity, monitoring, quadrupole, extraction	23
	A. Lyapin, R. Ainsworth, S.T. Boogert, G.E. Boorman, F.J. Cullinan, N.Y. Joshi JAI, Egham, Surrey, United Kingdom A.S. Aryshev, Y. Honda, T. Tauchi, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan J.C. Frisch, D.J. McCormick, J. Nelson, T.J. Smith, G.R. White SLAC, Menlo Park, California, USA A. Heo, E.-S. Kim, H.-S. Kim, Y.I. Kim KNU, Deagu, Republic of Korea M.C. Ross Fermilab, Batavia, USA
	In this paper we summarise our 2-year experience operating the Cavity Beam Position Monitor (CBPM) system at the Accelerator Test Facility (ATF) in KEK. The system currently consists of 41 C and S-band CBPMs and is the main diagnostic tool for the new ATF2 extraction beamline. We concentrate on issues related to the scale of the system and also consider long-term effects, most of which are undetectable or insignificant in smaller experimental prototype systems. We consistently show sub-micron BPM resolutions and week-to-week scale drifts of an order of 1%.
	Slides MOOC02 [2.075 MB]

MOPD21	Overview of the BPM System of the ESS-Bilbao	controls, linac, LLRF, impedance	89
	D. Belver, I. Arredondo, P. Echevarria, J. Feuchtwanger, H. Hassanzadegan, M. del Campo ESS-Bilbao, Zamudio, Spain F.J. Bermejo Bilbao, Faculty of Science and Technology, Bilbao, Spain V. Etxebarria, J. Jugo, J. Portilla University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain N. Garmendia, L. Muguira ESS Bilbao, Bilbao, Spain
	The BPM system from ESS-Bilbao is presented, including test bench, electronics and test results. Our test bench implements 4 capacitive buttons welded to the beam pipe. The position of the internal tube simulating the beam can be changed with respect to the outer tube within a range of 20 mm, with a resolution less than 10 μm. It is connected to an Analog Front-End (AFE) where signals are conditioned and converted to baseband and a Digital Unit (DU) to sample them and calculate the position and phase. The AFE is based on logarithmic amplifiers and IQ demodulators. Signals are converted from differential to single-ended and conditioned to meet the DU requirements (FPGA and ADC). DU includes offset compensation, gain adjustment, CORDIC, delta over σ algorithm and linearization blocks. To manage the FPGA a Java interface has been developed including also the EPICS integration by means of JavaIOC and a MySQL interface. The resolution and accuracy results are promising (less than 10 μm and 1° for the position and phase) provided that the effect of several errors such as temperature variations and nonlinearities are minimized through temperature regulation and system calibration.
	Poster MOPD21 [1.476 MB]

MOPD75	Compact Reconfigurable FPGA Based Beam Current Safety System for UCN	target, controls, monitoring, kicker	218
	P.-A. Duperrex PSI, Villigen, Switzerland
	At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. A beam current monitoring system has been developed as part of a safety system for the UCN source operation. This monitoring system is based on a reconfigurable FPGA system from National Instrument. This paper will present the advantages of such a system compared to analog electronics, its flexibility to future new performance requests and the integration details in the safety control system.

TUPD23	New Bunch-by-Bunch Feedback System for the TLS	feedback, controls, diagnostics, kicker	353
	C.H. Kuo, Y.K. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu NSRRC, Hsinchu, Taiwan
	FPGA based bunch-by-bunch feedback systems were deployed in 2005-2006 by using SPring-8 designed feedback processors for the Taiwan Light Source. To provide spare units and explore integrate with the control system in the EPICS toolkit environment, feedback processors from the Dimtel were setup. The new system can be swap with the existed system by simple cable re-connection and integrated with the EPICS system in seamless way. Rich functionality except the basic feedback function includes excitation of individual bunch or specifies bunches, averaged spectrum, tune measurement by the feedback dip in the averaged spectrum, fill pattern measurement, etc. are explorer. Current stage implementation and features of the system will summary in this report.

TUPD90	POMPOMs: Cost-Efficient Polarity Sensors for the MICE Muon Beamline	monitoring, dipole, radiation, controls	518
	J.J. Nebrensky Brunel University, Middlesex, United Kingdom P.M. Hanlet IIT, Chicago, Illinois, USA
	Funding: STFC (UK) The cooling effect in MICE (Muon Ionisation Cooling Experiment) will be studied with both positive and negative muons, reversing the electrical input to the magnets by physically swapping over the power leads. Ensuring the actual operating polarity of the beamline is correctly recorded is a manual step and at risk of error or omission. We have deployed a simple system for monitoring the operating polarity of the two bending magnets by placing in each dipole bore a Honeywell LOHET-II Hall-effect sensor that operates past saturation at nominal field strengths, and thus return one of two well-defined voltages corresponding to the two possible polarities of the magnet. The environment in the experimental hall is monitored by an AKCP securityProbe 5E system integrated into our EPICS-based controls and monitoring system. We read out the beamline polarity sensors using a voltmeter module, and translate the output voltage into a polarity (or alarm) state within EPICS whence it can be accessed by the operators and stored in the output datastream. Initial test of the LOHET-II sensors indicates they will still be able to indicate beamline polarity after radiation doses of 600 Gy (Co60). We'd like to thank Prof. Peter Hobson and Dr David Smith at Brunel University for performing the sensor irradiation
	Poster TUPD90 [0.627 MB]

TUPD96	Fast and Critical Detection Devices Planned for the Machine Protection System at the Facility for Rare Isotope Beams	linac, controls, status, beam-losses	533
	G. Kiupel, S. Assadi, T.D. Brown, P. Chu, J.L. Crisp, S. Peng, M.W. Stettler, Y. Zhang FRIB, East Lansing, Michigan, USA
	Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) will use a 400 kW, heavy-ion cw linac to produce rare isotopes in support of a rich program of fundamental research. In the event of operational failures, the Machine Protection System (MPS) shuts off the beam within microseconds to control beam losses that may damage accelerator components. The operational mode is distributed to all fast and critical devices that have multiple hardware checkpoints and comparators. A relational database provides the framework for the development of the MPS management application. In this paper, we present the FRIB MPS architecture, plans and implementation.

Paper

Title

Other Keywords

Page

MOOC02

Cavity BPM System for ATF2

cavity, monitoring, quadrupole, extraction

23

A. Lyapin, R. Ainsworth, S.T. Boogert, G.E. Boorman, F.J. Cullinan, N.Y. Joshi
JAI, Egham, Surrey, United Kingdom
A.S. Aryshev, Y. Honda, T. Tauchi, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan
J.C. Frisch, D.J. McCormick, J. Nelson, T.J. Smith, G.R. White
SLAC, Menlo Park, California, USA
A. Heo, E.-S. Kim, H.-S. Kim, Y.I. Kim
KNU, Deagu, Republic of Korea
M.C. Ross
Fermilab, Batavia, USA

In this paper we summarise our 2-year experience operating the Cavity Beam Position Monitor (CBPM) system at the Accelerator Test Facility (ATF) in KEK. The system currently consists of 41 C and S-band CBPMs and is the main diagnostic tool for the new ATF2 extraction beamline. We concentrate on issues related to the scale of the system and also consider long-term effects, most of which are undetectable or insignificant in smaller experimental prototype systems. We consistently show sub-micron BPM resolutions and week-to-week scale drifts of an order of 1%.

Slides MOOC02 [2.075 MB]

MOPD21

Overview of the BPM System of the ESS-Bilbao

controls, linac, LLRF, impedance

89

D. Belver, I. Arredondo, P. Echevarria, J. Feuchtwanger, H. Hassanzadegan, M. del Campo
ESS-Bilbao, Zamudio, Spain
F.J. Bermejo
Bilbao, Faculty of Science and Technology, Bilbao, Spain
V. Etxebarria, J. Jugo, J. Portilla
University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
N. Garmendia, L. Muguira
ESS Bilbao, Bilbao, Spain

The BPM system from ESS-Bilbao is presented, including test bench, electronics and test results. Our test bench implements 4 capacitive buttons welded to the beam pipe. The position of the internal tube simulating the beam can be changed with respect to the outer tube within a range of 20 mm, with a resolution less than 10 μm. It is connected to an Analog Front-End (AFE) where signals are conditioned and converted to baseband and a Digital Unit (DU) to sample them and calculate the position and phase. The AFE is based on logarithmic amplifiers and IQ demodulators. Signals are converted from differential to single-ended and conditioned to meet the DU requirements (FPGA and ADC). DU includes offset compensation, gain adjustment, CORDIC, delta over σ algorithm and linearization blocks. To manage the FPGA a Java interface has been developed including also the EPICS integration by means of JavaIOC and a MySQL interface. The resolution and accuracy results are promising (less than 10 μm and 1° for the position and phase) provided that the effect of several errors such as temperature variations and nonlinearities are minimized through temperature regulation and system calibration.

Poster MOPD21 [1.476 MB]

MOPD75

Compact Reconfigurable FPGA Based Beam Current Safety System for UCN

target, controls, monitoring, kicker

218

P.-A. Duperrex
PSI, Villigen, Switzerland

At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. A beam current monitoring system has been developed as part of a safety system for the UCN source operation. This monitoring system is based on a reconfigurable FPGA system from National Instrument. This paper will present the advantages of such a system compared to analog electronics, its flexibility to future new performance requests and the integration details in the safety control system.

TUPD23

New Bunch-by-Bunch Feedback System for the TLS

feedback, controls, diagnostics, kicker

353

C.H. Kuo, Y.K. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu
NSRRC, Hsinchu, Taiwan

FPGA based bunch-by-bunch feedback systems were deployed in 2005-2006 by using SPring-8 designed feedback processors for the Taiwan Light Source. To provide spare units and explore integrate with the control system in the EPICS toolkit environment, feedback processors from the Dimtel were setup. The new system can be swap with the existed system by simple cable re-connection and integrated with the EPICS system in seamless way. Rich functionality except the basic feedback function includes excitation of individual bunch or specifies bunches, averaged spectrum, tune measurement by the feedback dip in the averaged spectrum, fill pattern measurement, etc. are explorer. Current stage implementation and features of the system will summary in this report.

TUPD90

POMPOMs: Cost-Efficient Polarity Sensors for the MICE Muon Beamline

monitoring, dipole, radiation, controls

518

J.J. Nebrensky
Brunel University, Middlesex, United Kingdom
P.M. Hanlet
IIT, Chicago, Illinois, USA

Funding: STFC (UK)
The cooling effect in MICE (Muon Ionisation Cooling Experiment) will be studied with both positive and negative muons, reversing the electrical input to the magnets by physically swapping over the power leads. Ensuring the actual operating polarity of the beamline is correctly recorded is a manual step and at risk of error or omission. We have deployed a simple system for monitoring the operating polarity of the two bending magnets by placing in each dipole bore a Honeywell LOHET-II Hall-effect sensor that operates past saturation at nominal field strengths, and thus return one of two well-defined voltages corresponding to the two possible polarities of the magnet. The environment in the experimental hall is monitored by an AKCP securityProbe 5E system integrated into our EPICS-based controls and monitoring system. We read out the beamline polarity sensors using a voltmeter module, and translate the output voltage into a polarity (or alarm) state within EPICS whence it can be accessed by the operators and stored in the output datastream. Initial test of the LOHET-II sensors indicates they will still be able to indicate beamline polarity after radiation doses of 600 Gy (Co60).
We'd like to thank Prof. Peter Hobson and Dr David Smith at Brunel University for performing the sensor irradiation

Poster TUPD90 [0.627 MB]

TUPD96

Fast and Critical Detection Devices Planned for the Machine Protection System at the Facility for Rare Isotope Beams

linac, controls, status, beam-losses

533

G. Kiupel, S. Assadi, T.D. Brown, P. Chu, J.L. Crisp, S. Peng, M.W. Stettler, Y. Zhang
FRIB, East Lansing, Michigan, USA

Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) will use a 400 kW, heavy-ion cw linac to produce rare isotopes in support of a rich program of fundamental research. In the event of operational failures, the Machine Protection System (MPS) shuts off the beam within microseconds to control beam losses that may damage accelerator components. The operational mode is distributed to all fast and critical devices that have multiple hardware checkpoints and comparators. A relational database provides the framework for the development of the MPS management application. In this paper, we present the FRIB MPS architecture, plans and implementation.