DIPAC2011 - List of Keywords (monitoring)

Paper	Title	Other Keywords	Page
MOOC01	Overview of Recent Trends and Developments for BPM Systems	cavity, pick-up, coupling, linac	18
	M. Wendt Fermilab, Batavia, USA
	Beam position monitoring (BPM) systems are the workhorse beam diagnostics for almost any kind of charged particle accelerator; linear, circular or transport-lines, operating with leptons, hadrons or heavy ions. The BPMs are essential for beam commissioning, accelerator fault analysis and trouble shooting, machine optics and lattice measurements, and finally for the accelerator optimization to achieve the ultimate beam quality. This presentation summarizes the efforts of the beam instrumentation community on recent developments and advances on BPM technologies, i.e. BPM pickup monitors and front-end electronics (analog and digital). Principles, examples, and state-of-the-art status on various BPM techniques are outlined, serving hadron and heavy ion machines, sync light synchrotron's, as well as electron linacs for FEL or HEP applications.
	Slides MOOC01 [4.123 MB]

MOOC02	Cavity BPM System for ATF2	cavity, quadrupole, EPICS, 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]

MOPD16	Advanced Digital Signal Processing for Effective Beam Position Monitoring	synchrotron, antiproton, heavy-ion, proton	74
	D.A. Liakin ITEP, Moscow, Russia P. Forck, K. Lang, R. Singh GSI, Darmstadt, Germany
	A latest experience in digital signal processing of BPM data obtained in synchrotrons of ITEP and GSI is discussed. The data in ITEP was collected by BPM processor prototype while the SIS18 in GSI uses a renovated digital system. Due to different concept of BPM architectures on those facilities it is possible to compare algorithms oriented to certain hardware. Several algorithms of position detection are compared to each other. Performances of ‘collective’ and partly distributed algorithms are estimated. Data reduction methods and visualization solutions are considered. Finally low- and wideband data evaluation for longitudinal phase space is presented.
	Poster MOPD16 [13.416 MB]

MOPD20	Applicability of the AM-PM Conversion Method to Beam Position Monitoring of Electron Beams accelerated in S-Band Frequency Range	electron, pick-up, insertion, controls	86
	M. Ruf, P. Quednau, L. Schmidt U. Erlangen-Nurnberg LHFT, Erlangen, Germany S. Setzer Siemens Med, Erlangen, Germany
	Funding: Work supported by Bayerische Forschungsstiftung in the project "MEDieMAS - Effiziente Bestrahlungsgeräte für Krebstherapie (Efficient radiation systems for cancer therapy)", file number AZ-735-07 In this paper, the applicability of the amplitude-to-phase-conversion (AM-PM) method to beam position monitoring (BPM) purposes in S-Band frequency range is investigated. The proof-of-principle experiment is done by AM-PM-processing of capacitive pickup signals generated by a 6 MeV S-Band electron beam. It is demonstrated that the AM-PM-output pulsed DC signal is proportional to transverse beam offsets. Furthermore, design considerations and selection criteria of appropriate RF devices are described. Additionally, results of cold measurements of a planar 2-channel AM-PM-receiver module are presented indicating that the applicability will also be given for even higher frequency ranges.

MOPD26	Testing of New Hadron Beam Phase and Position Monitor at CIEMAT Laboratory	instrumentation, controls, pick-up, feedback	104
	M. Znidarcic, B.B. Baricevic, R. Hrovatin I-Tech, Solkan, Slovenia J.M. Carmona, A. Ibarra, I. Podadera CIEMAT, Madrid, Spain
	The Libera Single Pass H is the new instrumentation intended for phase, position and charge monitoring in hadron and heavy ion LINACs and transfer lines. Initial measurements and verification of the instrumentation performance were conducted in the laboratory at Instrumentation Technologies. Characterization measurements of the same electronics were later carried out at CIEMAT laboratory. The measurements were performed on a CIEMAT wire test bench with the 175 MHz pulsed signal connected to the wire. Different measurements were performed on the test bench; First, by moving the wire over larger displacements and checking the position and, later, by changing the signal phase and performing the phase shift measurement. This article discusses the new Libera Single Pass H electronics, the tests carried out in the test bench and the performance obtained.

MOPD44	Self Testing Functionality of the LHC BLM System	high-voltage, injection, collider, diagnostics	152
	J. Emery, B. Dehning, E. Effinger, A. Nordt, C. Zamantzas CERN, Geneva, Switzerland
	Reliability concerns have driven the design of the LHC BLM system throughout its development, from the early conceptual stage right through the commissioning phase and up to the latest development of diagnostic tools. To protect the system against non-conformities, new ways of automatic checking have been developed and implemented. These checks are regularly and systematically executed by the LHC operation team to insure that the system status after each test is "as good as new". This checks the electrical part of the detectors (ionisation chamber or secondary emission monitor), their cable connections to the front-end electronics, the connections to the back-end electronics and their ability to request a beam abort. During the installation and in the early commissioning phase, these checks proved invaluable in finding non-conformities caused by unexpected failures. This paper will describe these checks in detail, commenting on the latest performance and the typical non-conformities detected. A statistical analysis of the LHC BLM system will also be presented to show the evolution of the various system parameters.
	Poster MOPD44 [2.068 MB]

MOPD55	SEM-GRID Prototype Electronics using Charge-Frequency-Converters	diagnostics, controls, ion, radiation	176
	M. Witthaus, J. Adamczewski-Musch, H. Flemming, J. Frühauf, S. Löchner, H. Reeg, P. Skott GSI, Darmstadt, Germany
	A prototype system using an ASIC equipped with 8 Charge-to-Frequency Converters (CFC) was developed in collaboration between the Beam Diagnostics and Experiment Electronics Department at GSI. The maximum sensitivity is 250 fC per output pulse. It will serve as an economic alternative for the readout electronics of Secondary Electron Monitor (SEM)profile grids or comparable beam diagnostic devices like Multi-Wire Proportional Chambers (MWPC). The goal of this contribution is to report on a detailed performance test under real beam conditions at GSI beam lines. A 32-channel electronics is connected to different beam profile SEM-grids at a LINAC beam line and tested with various beam conditions. Transversal beam profiles with a time resolution down to the microsecond range have been recorded successfully. Beam profiles recorded with the new CFC-board and the old standard trans-impedance amplifiers agreed well. Further measurements were done with Multi-Wire Proportional Chamber. Therefore the prototype was extended to 64-input channels recently.
	Poster MOPD55 [1.344 MB]

MOPD65	Sensitivity Optimization of the Standard Beam Current Monitors for XFEL and FLASH II	pick-up, impedance, diagnostics, ion	197
	M. Werner, J. Lund-Nielsen, Re. Neumann, N. Wentowski DESY, Hamburg, Germany
	There is a tendency to operate 4th generation SASE driven light sources at very low charge in order to further shorten the pulse length. Therefore the operation range of XFEL and FLASH II was extended to a charge range of as low as 20 pC to 1 nC. For a reliable charge measurement down to 20 pC, a low noise design of the signal chain from the monitor head to the digitizing ADC is necessary. This paper describes the steps taken in order to increase the sensitivity and dynamic range of the monitors currently used in the FLASH accelerator, and the basic theoretical background will be explained. Finally, first results are presented.
	Poster MOPD65 [0.768 MB]

MOPD69	Tune Measurements with High Intensity Beams at SIS-18	injection, acceleration, emittance, diagnostics	206
	R. Singh, P. Forck, W. Kaufmann, P. Kowina GSI, Darmstadt, Germany R. Singh TEMF, TU Darmstadt, Darmstadt, Germany
	Funding: This work is supported by DITANET (novel DIagnostic Techniques for future particle Accelerators: A Marie Curie Initial Training NETwork), Project Number ITN-2008-215080 To achieve high current operation close to the space charge limit in a synchrotron, a precise tune measurement during a full accelerating cycle is required. A tune measurement system that was recently commissioned at GSI synchrotron SIS-18 allows for online evaluation of the actual tune. This system consists of three distinct parts; an exciter which provides power to excite coherent betatron oscillations of the beam. The BPM signals thus induced are digitized by fast ADCs at 125 MSa/s and then the post processing electronics integrates the data bunch by bunch to obtain one position value per bunch. Subsequently base band tune is determined by Fourier transformation of the position data. The tune variation during acceleration for various beam conditions was measured using this system and is discussed. A detailed investigation of the incoherent tune shift was conducted with Uranium ion beams at the injection energy of 11.6 MeV/u. The results show the influence of beam current on the tune spectrum. In addition, the effects of the measurement method on the beam emittance and beam losses are discussed.

MOPD75	Compact Reconfigurable FPGA Based Beam Current Safety System for UCN	target, controls, kicker, EPICS	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.

MOPD83	Performance of the Fast Beam Conditions Monitor BCM1F in the CMS Experiment at the LHC	proton, radiation, luminosity, vacuum	239
	M.E. Castro Carballo DESY Zeuthen, Zeuthen, Germany
	In the CMS detector a series of beam condition monitors were installed and are in operation for measuring radiation doses and preventing possible damages to the detector in case of beam losses. The Fast Beam Condition Monitor, BCM1F, is installed inside the pixel volume close to the beam pipe and it consists of two planes of 4 modules each located 1.8 m away from the IP, on both sides. It uses single-crystal CVD diamond sensors and radiation hard front-end electronics, along with an optical transmission of the signal. It was designed for fast flux monitoring, measuring beam halo and collision products on a bunch by bunch basis. Early in November 2009 the LHC restarted running with beams and since then BCM1F has been recording data from beam halo, beam studies, proton-proton and lead-lead collisions. It is an invaluable tool in everyday CMS operation and, due to the high sensitivity to beam conditions, is providing the so called Background (BKGD) 1 to LHC operators. A characterization of the system on the basis of data collected during LHC operation will be presented.
	Poster MOPD83 [1.449 MB]

MOPD87	The LHC Beam Presence Flag System	controls, injection, impedance, feedback	251
	M. Gasior, T.B. Bogey CERN, Geneva, Switzerland
	Before injecting any high intensity bunches into the LHC a circulating low intensity pilot bunch must be present to confirm the correct settings of the main machine parameters. For the 2010 LHC run the detection of this pilot beam was done with the beam current transformer system. To increase redundancy of this important safety function a dedicated beam presence flag system was designed, built and tested with beam to be used operationally in the 2011 run. In this system signals from four electrodes of a beam position monitor (BPM) are processed with separate channels, resulting in a quadruple system redundancy for either beam. Each system channel consists of an analogue front-end converting the BPM signals into two logic states, which are then transmitted optically to the machine protection and interlock systems. For safety reasons the system does not have any remote control or adjustable elements and its only inputs are the beam signals. This paper describes the new LHC beam presence flag system, in particular the analogue front-end based on diode peak detectors.
	Poster MOPD87 [8.200 MB]

TUPD16	High Frequency Measurements of the Beam Position Monitors for the TBL Line of the CTF3 at CERN	impedance, bunching, pick-up, simulation	335
	J.J. García-Garrigós, C. Blanch Gutierrez, J.V. Civera-Navarrete, A. Faus-Golfe IFIC, Valencia, Spain B. Gimeno UVEG, Burjasot (Valencia), Spain
	Funding: Funding Agency: FPA2010-21456-C02-00 A series of Inductive Pick-Ups (IPU) for Beam Position Monitoring (BPM) with its associated electronics were designed, constructed and tested at IFIC. A full set of 16 BPMs, so called BPS units, were successfully installed in the Test Beam Line (TBL) of the 3rd CLIC Test Facility (CTF3) at CERN. Two different characterization tests, at low and high frequencies, were carried out on the BPS units: The low frequency test, in the beam pulse time scale (until 10ns/100MHz), determined the BPSs parameters directly related to the beam position monitoring and the high frequency test, reaching the microwave X-Ku bands around the beam bunching time scale (83ps/12GHz). In this paper we describe the results and methods used to obtain the longitudinal impedance in the frequency range of interest. This test is based on the S-parameters measurements of the propagating TEM mode in a matched coaxial waveguide, specifically designed for the BPS, which is able to emulate an ultra-relativistic electron beam.
	Poster TUPD16 [1.069 MB]

TUPD42	Design and Experiences with the Beam Condition Monitor as Protection System in the CMS Experiment of the LHC	background, vacuum, beam-losses, radiation	398
	M. Guthoff CERN, Geneva, Switzerland
	The Beam Condition Monitor (BCM) is used as protection system. In order to prevent damage to the pixel and tracker detectors it can trigger a beam dump when extremely high beam losses occur. The system consists of BCM1L with 4 diamonds per side at 1.8m away from the interaction point and BCM2 with 4 inner and 8 outer diamonds per side at 14.4m away from the interaction point. As detector material poly-crystalline CVD diamonds are used. The readout electronics is identical to the Beam Loss Monitor (BLM) system of the LHC. With cross calibration measurements a direct comparison between the BLM and the BCM systems is possible. The BCM system is therefore a transparent extension of the BLM system into the CMS cavern. The BCM2 system has been active in the beam abort system since the beginning of collisions at the LHC. Design and performance of the system during the run of the LHC so far will be presented. *on behalf of the CMS BRM group.
	Poster TUPD42 [0.736 MB]

TUPD44	LHC Beam Loss Monitoring System Verification Applications	controls, collider, feedback, survey	404
	E. Fadakis, B. Dehning, S. Jackson, C. Zamantzas CERN, Geneva, Switzerland
	The LHC Beam Loss Monitoring (BLM) system is one of the most complex instrumentation systems deployed in the LHC. In addition to protecting the collider, the system also needs to provide a means of diagnosing machine faults and deliver a feedback of losses to the control room as well as to several systems for their setup and analysis. It has to transmit and process signals from almost 4’000 monitors, and has nearly 3 million configurable parameters. The system was designed with reliability and availability in mind. The specified operation and the fail-safety standards must be guaranteed for the system to perform its function in preventing superconductive magnet destruction caused by particle flux. Maintaining the expected reliability requires extensive testing and verification. In this paper we report our most recent additions to the numerous verification applications. The developments have been made using LabVIEW and CERN custom made libraries and allow the user to connect either directly to the front end computer (FEC) or through a dedicated server.

TUPD68	Feasibility Study for a Single-Shot 3D Electron Bunch Charge Distribution Monitor with a Polarized Probe Laser at SPring-8 Photoinjector	laser, polarization, electron, gun	464
	Y. Okayasu, H. Dewa, H. Hanaki, S. Matsubara, A. Mizuno, S. Suzuki, T. Taniuchi, H. Tomizawa, K. Yanagida JASRI/SPring-8, Hyogo-ken, Japan T. Ishikawa RIKEN Spring-8 Harima, Hyogo, Japan A. Maekawa, M. Uesaka The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
	It is essential for precise characterizations of light sources to monitor ever-changing charge distribution of electron bunch by single-shot measurement with high resolutions. Therefore, a single-shot and non-destructive 3D bunch charge distribution (BCD) monitor was developed to characterize longitudinal and transverse BCDs simultaneously. It is based on Electro-Optical (EO) multiple sampling with a manner of spectral decoding. For the transverse detection, eight EO-crystals surround the beam axis azimuthally, and a linear-chirped probe laser pulse with a hollow shape and spirally temporal shift, passes through the EO-crystals. A principle verification experiment has been successfully carried out with two EO-crystals in our facility. In addition, we are promoting a numerical calculation of the ultra-short and radial polarized laser transportation for our own system assuming eight EO-crystals usage in order to confirm observation feasibility. We report the principle and the first experimental results of the novel 3D-BCD monitor and introduce the feasibility demonstration with a calculation about a propagation of transverse polarization distributions along probe laser optics.
	Poster TUPD68 [4.684 MB]

TUPD72	Advancements in the Base-Band-Tune and Chromaticity Instrumentation and Diagnostics Systems during LHC's First Year of Operation	diagnostics, feedback, synchrotron, resonance	476
	R.J. Steinhagen, M. Gasior, S. Jackson CERN, Geneva, Switzerland
	The Base-Band-Tune (BBQ) system is an integral part of day-to-day LHC operation, used for tune and chromaticity diagnostics and feedback and giving unprecedented precision with good reliability. This contribution summarises the system's overall performance and documents the various improvements of the analogue front-end circuitry, digital post-processing and integration that were necessary in response to issues arising during high-intensity physics operation. The result of beam studies undertaken are presented, which have established a better understanding of the detection principle since its first introduction in 2005.
	Poster TUPD72 [0.794 MB]

TUPD76	Vibration and Beam Motion Diagnostics in TLS	electron, photon, status, diagnostics	485
	Y.K. Chen, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo NSRRC, Hsinchu, Taiwan
	High beam stability is essential in a modern synchrotron light source due to small emittance. Beam motion caused by various factors should be remedy by various approaches to achieve high beam stability. Vibration will deteriorate beam stability and need considered as a part of beam diagnostic. An integrated environment for beam orbit and vibration monitoring systems were set up for various studies. Implementation details and some beam observation will be presented in this report.
	Poster TUPD76 [2.750 MB]

TUPD87	Fuzzy Logic Controls of a Particle Accelerator	controls, ion, fuzzy set, focusing	509
	O.F. Toader NERS-UM, Ann Arbor, Michigan, USA
	The ion beams produced in a particle accelerator have to be characterized and monitored using parameters specific to the instruments involved and information from practical (hands-on) operation of those instruments and of the accelerator as a whole. The control is critical considering the multitude of equipment and tasks involved. It is a nonlinear, non-standard process difficult to model. This paper will presents the progress that is currently being made in the attempt to implement fuzzy logic theory in controlling parts of the 1.7 MV Tandem particle accelerator at the Michigan Ion Beam Laboratory.

TUPD90	POMPOMs: Cost-Efficient Polarity Sensors for the MICE Muon Beamline	EPICS, 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]

TUPD94	Monitoring of GeV Deuteron Beam Parameters in ADS Experiments at the Nuclotron (JINR, Dubna)	target, neutron, proton, synchrotron	530
	A.A. Safronava, A.A. Patapenka JIPNR-Sosny NASB, Minsk, Belarus V.V. Sotnikov, V.A. Voronko NSC/KIPT, Kharkov, Ukraine O. Svoboda NPI, Řež near Prague, Czech Republic W. Westmeier Philipps-Universität, Marburg, Germany
	The quality of beam instrumentation is very important in the experiments on accelerator driven systems (ADS) aiming to investigate spatial and energy distribution of neutrons inside and outside the subcritical setups comprising spallation neutron sources irradiated by relativistic beams. An important source of systematic uncertainties of the experimental data is the inaccuracy of determination of the beam parameters such as total intensity of the extracted beam, beam position at the target, fraction of the beam hitting the target and beam shape. This paper reviews the experimental techniques and measurement tools for deuteron beam monitoring used within the “Energy plus Transmutation” collaboration in the ADS experiments at the accelerator complex of Nuclotron (JINR, Russia): - activation technique using Al monitors for measurement of the total intensity of the extracted beam; - solid nuclear track detectors method and activation technique using segmented activation Cu foils for determination of beam profile and position at the target.
	Poster TUPD94 [13.019 MB]

Paper

Title

Other Keywords

Page

MOOC01

Overview of Recent Trends and Developments for BPM Systems

cavity, pick-up, coupling, linac

18

M. Wendt
Fermilab, Batavia, USA

Beam position monitoring (BPM) systems are the workhorse beam diagnostics for almost any kind of charged particle accelerator; linear, circular or transport-lines, operating with leptons, hadrons or heavy ions. The BPMs are essential for beam commissioning, accelerator fault analysis and trouble shooting, machine optics and lattice measurements, and finally for the accelerator optimization to achieve the ultimate beam quality. This presentation summarizes the efforts of the beam instrumentation community on recent developments and advances on BPM technologies, i.e. BPM pickup monitors and front-end electronics (analog and digital). Principles, examples, and state-of-the-art status on various BPM techniques are outlined, serving hadron and heavy ion machines, sync light synchrotron's, as well as electron linacs for FEL or HEP applications.

Slides MOOC01 [4.123 MB]

MOOC02

Cavity BPM System for ATF2

cavity, quadrupole, EPICS, 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]

MOPD16

Advanced Digital Signal Processing for Effective Beam Position Monitoring

synchrotron, antiproton, heavy-ion, proton

74

D.A. Liakin
ITEP, Moscow, Russia
P. Forck, K. Lang, R. Singh
GSI, Darmstadt, Germany

A latest experience in digital signal processing of BPM data obtained in synchrotrons of ITEP and GSI is discussed. The data in ITEP was collected by BPM processor prototype while the SIS18 in GSI uses a renovated digital system. Due to different concept of BPM architectures on those facilities it is possible to compare algorithms oriented to certain hardware. Several algorithms of position detection are compared to each other. Performances of ‘collective’ and partly distributed algorithms are estimated. Data reduction methods and visualization solutions are considered. Finally low- and wideband data evaluation for longitudinal phase space is presented.

Poster MOPD16 [13.416 MB]

MOPD20

Applicability of the AM-PM Conversion Method to Beam Position Monitoring of Electron Beams accelerated in S-Band Frequency Range

electron, pick-up, insertion, controls

86

M. Ruf, P. Quednau, L. Schmidt
U. Erlangen-Nurnberg LHFT, Erlangen, Germany
S. Setzer
Siemens Med, Erlangen, Germany

Funding: Work supported by Bayerische Forschungsstiftung in the project "MEDieMAS - Effiziente Bestrahlungsgeräte für Krebstherapie (Efficient radiation systems for cancer therapy)", file number AZ-735-07
In this paper, the applicability of the amplitude-to-phase-conversion (AM-PM) method to beam position monitoring (BPM) purposes in S-Band frequency range is investigated. The proof-of-principle experiment is done by AM-PM-processing of capacitive pickup signals generated by a 6 MeV S-Band electron beam. It is demonstrated that the AM-PM-output pulsed DC signal is proportional to transverse beam offsets. Furthermore, design considerations and selection criteria of appropriate RF devices are described. Additionally, results of cold measurements of a planar 2-channel AM-PM-receiver module are presented indicating that the applicability will also be given for even higher frequency ranges.

MOPD26

Testing of New Hadron Beam Phase and Position Monitor at CIEMAT Laboratory

instrumentation, controls, pick-up, feedback

104

M. Znidarcic, B.B. Baricevic, R. Hrovatin
I-Tech, Solkan, Slovenia
J.M. Carmona, A. Ibarra, I. Podadera
CIEMAT, Madrid, Spain

The Libera Single Pass H is the new instrumentation intended for phase, position and charge monitoring in hadron and heavy ion LINACs and transfer lines. Initial measurements and verification of the instrumentation performance were conducted in the laboratory at Instrumentation Technologies. Characterization measurements of the same electronics were later carried out at CIEMAT laboratory. The measurements were performed on a CIEMAT wire test bench with the 175 MHz pulsed signal connected to the wire. Different measurements were performed on the test bench; First, by moving the wire over larger displacements and checking the position and, later, by changing the signal phase and performing the phase shift measurement. This article discusses the new Libera Single Pass H electronics, the tests carried out in the test bench and the performance obtained.

MOPD44

Self Testing Functionality of the LHC BLM System

high-voltage, injection, collider, diagnostics

152

J. Emery, B. Dehning, E. Effinger, A. Nordt, C. Zamantzas
CERN, Geneva, Switzerland

Reliability concerns have driven the design of the LHC BLM system throughout its development, from the early conceptual stage right through the commissioning phase and up to the latest development of diagnostic tools. To protect the system against non-conformities, new ways of automatic checking have been developed and implemented. These checks are regularly and systematically executed by the LHC operation team to insure that the system status after each test is "as good as new". This checks the electrical part of the detectors (ionisation chamber or secondary emission monitor), their cable connections to the front-end electronics, the connections to the back-end electronics and their ability to request a beam abort. During the installation and in the early commissioning phase, these checks proved invaluable in finding non-conformities caused by unexpected failures. This paper will describe these checks in detail, commenting on the latest performance and the typical non-conformities detected. A statistical analysis of the LHC BLM system will also be presented to show the evolution of the various system parameters.

Poster MOPD44 [2.068 MB]

MOPD55

SEM-GRID Prototype Electronics using Charge-Frequency-Converters

diagnostics, controls, ion, radiation

176

M. Witthaus, J. Adamczewski-Musch, H. Flemming, J. Frühauf, S. Löchner, H. Reeg, P. Skott
GSI, Darmstadt, Germany

A prototype system using an ASIC equipped with 8 Charge-to-Frequency Converters (CFC) was developed in collaboration between the Beam Diagnostics and Experiment Electronics Department at GSI. The maximum sensitivity is 250 fC per output pulse. It will serve as an economic alternative for the readout electronics of Secondary Electron Monitor (SEM)profile grids or comparable beam diagnostic devices like Multi-Wire Proportional Chambers (MWPC). The goal of this contribution is to report on a detailed performance test under real beam conditions at GSI beam lines. A 32-channel electronics is connected to different beam profile SEM-grids at a LINAC beam line and tested with various beam conditions. Transversal beam profiles with a time resolution down to the microsecond range have been recorded successfully. Beam profiles recorded with the new CFC-board and the old standard trans-impedance amplifiers agreed well. Further measurements were done with Multi-Wire Proportional Chamber. Therefore the prototype was extended to 64-input channels recently.

Poster MOPD55 [1.344 MB]

MOPD65

Sensitivity Optimization of the Standard Beam Current Monitors for XFEL and FLASH II

pick-up, impedance, diagnostics, ion

197

M. Werner, J. Lund-Nielsen, Re. Neumann, N. Wentowski
DESY, Hamburg, Germany

There is a tendency to operate 4th generation SASE driven light sources at very low charge in order to further shorten the pulse length. Therefore the operation range of XFEL and FLASH II was extended to a charge range of as low as 20 pC to 1 nC. For a reliable charge measurement down to 20 pC, a low noise design of the signal chain from the monitor head to the digitizing ADC is necessary. This paper describes the steps taken in order to increase the sensitivity and dynamic range of the monitors currently used in the FLASH accelerator, and the basic theoretical background will be explained. Finally, first results are presented.

Poster MOPD65 [0.768 MB]

MOPD69

Tune Measurements with High Intensity Beams at SIS-18

injection, acceleration, emittance, diagnostics

206

R. Singh, P. Forck, W. Kaufmann, P. Kowina
GSI, Darmstadt, Germany
R. Singh
TEMF, TU Darmstadt, Darmstadt, Germany

Funding: This work is supported by DITANET (novel DIagnostic Techniques for future particle Accelerators: A Marie Curie Initial Training NETwork), Project Number ITN-2008-215080
To achieve high current operation close to the space charge limit in a synchrotron, a precise tune measurement during a full accelerating cycle is required. A tune measurement system that was recently commissioned at GSI synchrotron SIS-18 allows for online evaluation of the actual tune. This system consists of three distinct parts; an exciter which provides power to excite coherent betatron oscillations of the beam. The BPM signals thus induced are digitized by fast ADCs at 125 MSa/s and then the post processing electronics integrates the data bunch by bunch to obtain one position value per bunch. Subsequently base band tune is determined by Fourier transformation of the position data. The tune variation during acceleration for various beam conditions was measured using this system and is discussed. A detailed investigation of the incoherent tune shift was conducted with Uranium ion beams at the injection energy of 11.6 MeV/u. The results show the influence of beam current on the tune spectrum. In addition, the effects of the measurement method on the beam emittance and beam losses are discussed.

MOPD75

Compact Reconfigurable FPGA Based Beam Current Safety System for UCN

target, controls, kicker, EPICS

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.

MOPD83

Performance of the Fast Beam Conditions Monitor BCM1F in the CMS Experiment at the LHC

proton, radiation, luminosity, vacuum

239

M.E. Castro Carballo
DESY Zeuthen, Zeuthen, Germany

In the CMS detector a series of beam condition monitors were installed and are in operation for measuring radiation doses and preventing possible damages to the detector in case of beam losses. The Fast Beam Condition Monitor, BCM1F, is installed inside the pixel volume close to the beam pipe and it consists of two planes of 4 modules each located 1.8 m away from the IP, on both sides. It uses single-crystal CVD diamond sensors and radiation hard front-end electronics, along with an optical transmission of the signal. It was designed for fast flux monitoring, measuring beam halo and collision products on a bunch by bunch basis. Early in November 2009 the LHC restarted running with beams and since then BCM1F has been recording data from beam halo, beam studies, proton-proton and lead-lead collisions. It is an invaluable tool in everyday CMS operation and, due to the high sensitivity to beam conditions, is providing the so called Background (BKGD) 1 to LHC operators. A characterization of the system on the basis of data collected during LHC operation will be presented.

Poster MOPD83 [1.449 MB]

MOPD87

The LHC Beam Presence Flag System

controls, injection, impedance, feedback

251

M. Gasior, T.B. Bogey
CERN, Geneva, Switzerland

Before injecting any high intensity bunches into the LHC a circulating low intensity pilot bunch must be present to confirm the correct settings of the main machine parameters. For the 2010 LHC run the detection of this pilot beam was done with the beam current transformer system. To increase redundancy of this important safety function a dedicated beam presence flag system was designed, built and tested with beam to be used operationally in the 2011 run. In this system signals from four electrodes of a beam position monitor (BPM) are processed with separate channels, resulting in a quadruple system redundancy for either beam. Each system channel consists of an analogue front-end converting the BPM signals into two logic states, which are then transmitted optically to the machine protection and interlock systems. For safety reasons the system does not have any remote control or adjustable elements and its only inputs are the beam signals. This paper describes the new LHC beam presence flag system, in particular the analogue front-end based on diode peak detectors.

Poster MOPD87 [8.200 MB]

TUPD16

High Frequency Measurements of the Beam Position Monitors for the TBL Line of the CTF3 at CERN

impedance, bunching, pick-up, simulation

335

J.J. García-Garrigós, C. Blanch Gutierrez, J.V. Civera-Navarrete, A. Faus-Golfe
IFIC, Valencia, Spain
B. Gimeno
UVEG, Burjasot (Valencia), Spain

Funding: Funding Agency: FPA2010-21456-C02-00
A series of Inductive Pick-Ups (IPU) for Beam Position Monitoring (BPM) with its associated electronics were designed, constructed and tested at IFIC. A full set of 16 BPMs, so called BPS units, were successfully installed in the Test Beam Line (TBL) of the 3rd CLIC Test Facility (CTF3) at CERN. Two different characterization tests, at low and high frequencies, were carried out on the BPS units: The low frequency test, in the beam pulse time scale (until 10ns/100MHz), determined the BPSs parameters directly related to the beam position monitoring and the high frequency test, reaching the microwave X-Ku bands around the beam bunching time scale (83ps/12GHz). In this paper we describe the results and methods used to obtain the longitudinal impedance in the frequency range of interest. This test is based on the S-parameters measurements of the propagating TEM mode in a matched coaxial waveguide, specifically designed for the BPS, which is able to emulate an ultra-relativistic electron beam.

Poster TUPD16 [1.069 MB]

TUPD42

Design and Experiences with the Beam Condition Monitor as Protection System in the CMS Experiment of the LHC

background, vacuum, beam-losses, radiation

398

M. Guthoff
CERN, Geneva, Switzerland

The Beam Condition Monitor (BCM) is used as protection system. In order to prevent damage to the pixel and tracker detectors it can trigger a beam dump when extremely high beam losses occur. The system consists of BCM1L with 4 diamonds per side at 1.8m away from the interaction point and BCM2 with 4 inner and 8 outer diamonds per side at 14.4m away from the interaction point. As detector material poly-crystalline CVD diamonds are used. The readout electronics is identical to the Beam Loss Monitor (BLM) system of the LHC. With cross calibration measurements a direct comparison between the BLM and the BCM systems is possible. The BCM system is therefore a transparent extension of the BLM system into the CMS cavern. The BCM2 system has been active in the beam abort system since the beginning of collisions at the LHC. Design and performance of the system during the run of the LHC so far will be presented.
*on behalf of the CMS BRM group.

Poster TUPD42 [0.736 MB]

TUPD44

LHC Beam Loss Monitoring System Verification Applications

controls, collider, feedback, survey

404

E. Fadakis, B. Dehning, S. Jackson, C. Zamantzas
CERN, Geneva, Switzerland

The LHC Beam Loss Monitoring (BLM) system is one of the most complex instrumentation systems deployed in the LHC. In addition to protecting the collider, the system also needs to provide a means of diagnosing machine faults and deliver a feedback of losses to the control room as well as to several systems for their setup and analysis. It has to transmit and process signals from almost 4’000 monitors, and has nearly 3 million configurable parameters. The system was designed with reliability and availability in mind. The specified operation and the fail-safety standards must be guaranteed for the system to perform its function in preventing superconductive magnet destruction caused by particle flux. Maintaining the expected reliability requires extensive testing and verification. In this paper we report our most recent additions to the numerous verification applications. The developments have been made using LabVIEW and CERN custom made libraries and allow the user to connect either directly to the front end computer (FEC) or through a dedicated server.

TUPD68

Feasibility Study for a Single-Shot 3D Electron Bunch Charge Distribution Monitor with a Polarized Probe Laser at SPring-8 Photoinjector

laser, polarization, electron, gun

464

Y. Okayasu, H. Dewa, H. Hanaki, S. Matsubara, A. Mizuno, S. Suzuki, T. Taniuchi, H. Tomizawa, K. Yanagida
JASRI/SPring-8, Hyogo-ken, Japan
T. Ishikawa
RIKEN Spring-8 Harima, Hyogo, Japan
A. Maekawa, M. Uesaka
The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan

It is essential for precise characterizations of light sources to monitor ever-changing charge distribution of electron bunch by single-shot measurement with high resolutions. Therefore, a single-shot and non-destructive 3D bunch charge distribution (BCD) monitor was developed to characterize longitudinal and transverse BCDs simultaneously. It is based on Electro-Optical (EO) multiple sampling with a manner of spectral decoding. For the transverse detection, eight EO-crystals surround the beam axis azimuthally, and a linear-chirped probe laser pulse with a hollow shape and spirally temporal shift, passes through the EO-crystals. A principle verification experiment has been successfully carried out with two EO-crystals in our facility. In addition, we are promoting a numerical calculation of the ultra-short and radial polarized laser transportation for our own system assuming eight EO-crystals usage in order to confirm observation feasibility. We report the principle and the first experimental results of the novel 3D-BCD monitor and introduce the feasibility demonstration with a calculation about a propagation of transverse polarization distributions along probe laser optics.

Poster TUPD68 [4.684 MB]

TUPD72

Advancements in the Base-Band-Tune and Chromaticity Instrumentation and Diagnostics Systems during LHC's First Year of Operation

diagnostics, feedback, synchrotron, resonance

476

R.J. Steinhagen, M. Gasior, S. Jackson
CERN, Geneva, Switzerland

The Base-Band-Tune (BBQ) system is an integral part of day-to-day LHC operation, used for tune and chromaticity diagnostics and feedback and giving unprecedented precision with good reliability. This contribution summarises the system's overall performance and documents the various improvements of the analogue front-end circuitry, digital post-processing and integration that were necessary in response to issues arising during high-intensity physics operation. The result of beam studies undertaken are presented, which have established a better understanding of the detection principle since its first introduction in 2005.

Poster TUPD72 [0.794 MB]

TUPD76

Vibration and Beam Motion Diagnostics in TLS

electron, photon, status, diagnostics

485

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

High beam stability is essential in a modern synchrotron light source due to small emittance. Beam motion caused by various factors should be remedy by various approaches to achieve high beam stability. Vibration will deteriorate beam stability and need considered as a part of beam diagnostic. An integrated environment for beam orbit and vibration monitoring systems were set up for various studies. Implementation details and some beam observation will be presented in this report.

Poster TUPD76 [2.750 MB]

TUPD87

Fuzzy Logic Controls of a Particle Accelerator

controls, ion, fuzzy set, focusing

509

O.F. Toader
NERS-UM, Ann Arbor, Michigan, USA

The ion beams produced in a particle accelerator have to be characterized and monitored using parameters specific to the instruments involved and information from practical (hands-on) operation of those instruments and of the accelerator as a whole. The control is critical considering the multitude of equipment and tasks involved. It is a nonlinear, non-standard process difficult to model. This paper will presents the progress that is currently being made in the attempt to implement fuzzy logic theory in controlling parts of the 1.7 MV Tandem particle accelerator at the Michigan Ion Beam Laboratory.

TUPD90

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

EPICS, 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]

TUPD94

Monitoring of GeV Deuteron Beam Parameters in ADS Experiments at the Nuclotron (JINR, Dubna)

target, neutron, proton, synchrotron

530

A.A. Safronava, A.A. Patapenka
JIPNR-Sosny NASB, Minsk, Belarus
V.V. Sotnikov, V.A. Voronko
NSC/KIPT, Kharkov, Ukraine
O. Svoboda
NPI, Řež near Prague, Czech Republic
W. Westmeier
Philipps-Universität, Marburg, Germany

The quality of beam instrumentation is very important in the experiments on accelerator driven systems (ADS) aiming to investigate spatial and energy distribution of neutrons inside and outside the subcritical setups comprising spallation neutron sources irradiated by relativistic beams. An important source of systematic uncertainties of the experimental data is the inaccuracy of determination of the beam parameters such as total intensity of the extracted beam, beam position at the target, fraction of the beam hitting the target and beam shape. This paper reviews the experimental techniques and measurement tools for deuteron beam monitoring used within the “Energy plus Transmutation” collaboration in the ADS experiments at the accelerator complex of Nuclotron (JINR, Russia): - activation technique using Al monitors for measurement of the total intensity of the extracted beam; - solid nuclear track detectors method and activation technique using segmented activation Cu foils for determination of beam profile and position at the target.

Poster TUPD94 [13.019 MB]