DIPAC2011 - List of Keywords (instrumentation)

Paper	Title	Other Keywords	Page
MOPD10	A Calibration Method for the RF Front-end Asymmetry of the DBPM Processor	target, controls, pick-up, factory	56
	X. Yi, L.W. Lai, Y.B. Leng, Y.B. Yan, N. Zhang SSRF, Shanghai, People's Republic of China Z.C. Chen SINAP, Shanghai, People's Republic of China
	Digital Beam Position Monitor (DBPM) processor, designed to measure the beam positions in the LINAC, booster and the storage ring of a particle accelerator, has been used in many synchrotron radiation facilities. Channels asymmetry, which deteriorates the performance of the DBPM, is inevitable since the RF front-end needs four exactly same blocks. Recently, an RF front-end board for DBPM has been made with calibration circuit which clears the switching noise. The calibration method will be described in detail, including an overview of the RF board. The beam current dependence, which is sensitive to channels asymmetry, decreases from 160μm to 25μm after the calibration in the lab test.
	Poster MOPD10 [1.682 MB]

MOPD26	Testing of New Hadron Beam Phase and Position Monitor at CIEMAT Laboratory	controls, pick-up, monitoring, 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.

MOPD41	A Fast CVD Diamond Beam Loss Monitor for LHC	radiation, collimation, controls, beam-losses	143
	E. Griesmayer, B. Dehning, D. Dobos, E. Effinger, H. Pernegger CERN, Geneva, Switzerland
	Chemical Vapour Deposition (CVD) diamond detectors were installed in the collimation area of the CERN LHC to study their feasibility as Fast Beam Loss Monitors in a high-radiation environment. The detectors were configured with a fast, radiation-hard pre-amplifier with a bandwidth of 2 GHz. The readout was via an oscilloscope with a bandwidth of 1 GHz and a sampling rate of 5 GSPS. Despite the 250 m cable run from the detectors to the oscilloscope, single MIPs were resolved with a 2 ns rise time, a pulse width of 10 ns and a time resolution of less than 1 ns. Two modes of operation were applied. For the analysis of unexpected beam aborts, the loss profile was recorded in a 1 ms buffer and, for nominal operation, the histogram of the time structure of the losses was recorded in synchronism with the LHC period of 89.2 μs. Measurements during the LHC start-up (February to December 2010) are presented. The Diamond Monitors gave an unprecedented insight into the time structure of the beam losses resolving the 400 MHz RF frequency as well as the nominal bunch separation of 25 ns. In future, these detectors will be used to study ghost bunches and particles in the 3 μs abort gap.

MOPD76	The Petra III Fast Orbit Feedback System	feedback, controls, injection, brilliance	221
	J. Klute, K. Balewski, H.T. Duhme, H. Tiessen, F. Wierzcholek DESY, Hamburg, Germany
	Orbit stability is a crucial and import issue of 3rd generation light sources. Ambient mechanical and electrical noise cause rather large orbit distortions which have to be counteracted by an orbit feedback. Extensive studies of the orbit distortions in PETRA III have shown that the frequencies of the ambient noise lie within a frequency range from about 0.01Hz to 100Hz. In this paper we describe the main components, their properties and the layout of PETRA III’s orbit feedback. Furthermore experimental results on short and long term stability will be presented. It will be shown that the required orbit stability of ±0.5 μm in the vertical plane can be maintained over 50 h.

TUOB01	Options for Next Generation Digital Acquisition Systems	controls, factory, target, insertion	289
	A. Boccardi CERN, Geneva, Switzerland
	Digital acquisition system designers have an always increasing number of options in terms of bus standards and digital signal processing hardware among which to choose. This allows for a high flexibility but also open the door to a proliferation of different architectures, potentially limiting the reusability and the design synergies among the various instrumentation groups. This contribution illustrates the design trends in some of the major institutes around the world with design examples including VME, PCI and μTCA based modular systems using AMC and/or FMC mezzanines. Some examples of FPGA design practices aimed to increase reusability of code will be mentioned together with some of the tools already available to designers to improve the information exchange and the collaboration, like the Open Hardware Repository project.
	Slides TUOB01 [3.543 MB]

TUOC01	Highlights from the 2010 Beam Instrumentation Workshop	ion, ECR, linac, ion-source	297
	J.D. Gilpatrick LANL, Los Alamos, New Mexico, USA
	Funding: Work supported by the U.S. Department of Energy. The 14th Beam Instrumentation Workshop (BIW10) was hosted by the Los Alamos National Laboratory and was held in the La Fonda Hotel in downtown Santa Fe, NM, USA from May 3 – 6, 2010. At BIW10, there were a record amount of participants including 177 registered attendees, 92 poster presentations, and 22 companies represented. The oral presentations included 3 tutorials, 8 invited, 10 contributed, a Faraday Cup Award, 2 Vendor Technical, and 1 Special. This oral presentation provides an overview of beam instrumentation areas of interest, which were discussed during the workshop. From a selection of the BIW10 presented papers, a number of technical highlights will also be described. Finally, this oral presentation will briefly discuss the BIW10 Thursday afternoon tour that took place at the Los Alamos Neutron Science Center.
	Slides TUOC01 [3.110 MB]

TUPD21	Frontend Measurements and Optimizations at Libera Brilliance BPM Electronics during Commissioning of the Petra III Synchrotron Light Source	brilliance, controls, feedback, synchrotron	350
	F. Schmidt-Föhre, G. Kube, J.M. Maass, K. Wittenburg DESY, Hamburg, Germany
	New 3rd generation synchrotron light sources like Petra III utilize high-accuracy beam position measurement (BPM) systems to achieve the desired precision for beam position measurement and control, as needed for electron/positron beam stability and brilliance of the delivered photon beam. To reach the design goals, specifically adapted and parameterized commercial-of-the-shelf (COTS) Libera Brilliance BPM processor electronics are used within the Petra III BPM system. Quality of the acquired position measurement and orbit control data is highly dependent on the properties and setup of the analog and digital frontend of such BPM electronics. This paper shows influences and optimizations at the BPM system frontend of the Petra III light-source in reference to corresponding measurements done during the accelerator commissioning phase.

TUPD25	Design of Magnetic BPM and Error Corrections	electron, simulation, shielding, vacuum	359
	M. Shafiee, E. Ebrahimi, S.A.H. Feghhi Shahid Beheshti University, Evin, Tehran, Iran
	For beam position monitoring (BPM) purposes, two prominent approaches as a physical effect have been applied including electrostatic and magnetic. In electrostatic types, secondary emission from the electrodes can be a problem when strong beam loss occurs, in such a situation, a magnetic BPM may be chosen. For this purpose we made a magnetic BPM including a square shape of ferromagnetic core with winding on each side. In this case study we used it for detecting the position of wire which is including a pulsed current (as an electron bunch) produced by a PROTEK G305 pulse generator. A Tektronix 2235A oscilloscope was calibrated and used to measure the induced voltage of magnetic BPM. Measurement results have been compared with simulation using CST software and performed error corrections which are presented, with this regard we could measure the wire position with high resolution furthermore we deduced the wire position hasn’t linear relation with induced voltage and needs more physical and mathematical analyzing. This way propose us that we can use magnetic BPMs in this approach and calibrate them before installing on accelerators.
	Poster TUPD25 [0.120 MB]

TUPD55	Performance of the Time Resolved Spectrometer for the 5 MeV Photo-Injector PHIN	vacuum, impedance, dipole, electron	431
	D. Egger EPFL, Lausanne, Switzerland A.E. Dabrowski, M. Divall Csatari, S. Döbert, D. Egger, T. Lefèvre, O. Mete, M. Olvegård, M. Petrarca CERN, Geneva, Switzerland
	The PHIN photo-injector test facility is being commissioned at CERN in order to fulfill the beam parameter requirements for the 3rd CLIC Test Facility (CTF3), which includes the production of a 3.5 Amp stable beam, bunched at 1.5 GHz with a relative energy spread of less than 1%. A 90° spectrometer is instrumented with an OTR screen coupled to a gated intensified camera, followed by a segmented beam dump for time resolved energy measurements. The following paper describes the transverse and temporal resolution of the instrumentation with an outlook towards single-bunch energy measurements.
	Poster TUPD55 [0.959 MB]

TUPD92	SPIRAL2 Beam Energy Measurement	pick-up, simulation, linac, rfq	524
	W. Le Coz, T.A. André, C. Doutresssoulles, C. Jamet, S. Loret GANIL, Caen, France
	In order to produce high intensity exotic beams in the existing experimental rooms of the GANIL facility, the SPIRAL2 project is under development and under construction at GANIL. The first phase of the SPIRAL2 project consists to build a new accelerator composed of two sources, an ion source and a proton/neutron source, a RFQ and a superconducting Linac. The linac is designed to accelerate 5 mA deuterons up to 40 MeV and 1 mA heavy ions up to 14.5 MeV/u. A new electronic device has been developed at GANIL to measure phase and amplitude of pick-up signals and calculate the beam energy. The principle consists of directly digitizing the pick-up pulses by under-sampling. The Phase and amplitude of different harmonics are then calculated with a FPGA by an I/Q method before the beam energy calculation. This paper gives results of the peak-up tests in laboratory and the comparisons with simulations. The tests in laboratory and on the GANIL accelerator of an electronic prototype are shown and presented.

WEOD02	LHC Beam Diagnostics - the Users Point of View	luminosity, proton, ion, injection	580
	J. Wenninger CERN, Geneva, Switzerland
	The LHC started up with beam in November 2009, and within less then on year its luminosity reached 2·10³² cm^-2s⁻¹ at 3.5 TeV in October 2010. A few weeks later, in November 2010, lead ion collisions were established within little over 2 days. The fast progress and successes of the LHC commissioning and early operation would not have been possible without the excellent performance of its beam instrumentation. All essential instruments worked from the first day or were commissioned in a very short time, providing rapid diagnostics for the beam parameters. Tune and orbit feedbacks that rely on high quality measurements were used early on to achieve smooth operation with minimal beam losses. This presentation will address the performance of the LHC beam instrumentation, in particular the very large beam position and beam loss monitoring systems, both composed of many thousand channels. Present limitations and future improvements will also be discussed.
	Slides WEOD02 [11.950 MB]

Paper

Title

Other Keywords

Page

MOPD10

A Calibration Method for the RF Front-end Asymmetry of the DBPM Processor

target, controls, pick-up, factory

56

X. Yi, L.W. Lai, Y.B. Leng, Y.B. Yan, N. Zhang
SSRF, Shanghai, People's Republic of China
Z.C. Chen
SINAP, Shanghai, People's Republic of China

Digital Beam Position Monitor (DBPM) processor, designed to measure the beam positions in the LINAC, booster and the storage ring of a particle accelerator, has been used in many synchrotron radiation facilities. Channels asymmetry, which deteriorates the performance of the DBPM, is inevitable since the RF front-end needs four exactly same blocks. Recently, an RF front-end board for DBPM has been made with calibration circuit which clears the switching noise. The calibration method will be described in detail, including an overview of the RF board. The beam current dependence, which is sensitive to channels asymmetry, decreases from 160μm to 25μm after the calibration in the lab test.

Poster MOPD10 [1.682 MB]

MOPD26

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

controls, pick-up, monitoring, 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.

MOPD41

A Fast CVD Diamond Beam Loss Monitor for LHC

radiation, collimation, controls, beam-losses

143

E. Griesmayer, B. Dehning, D. Dobos, E. Effinger, H. Pernegger
CERN, Geneva, Switzerland

Chemical Vapour Deposition (CVD) diamond detectors were installed in the collimation area of the CERN LHC to study their feasibility as Fast Beam Loss Monitors in a high-radiation environment. The detectors were configured with a fast, radiation-hard pre-amplifier with a bandwidth of 2 GHz. The readout was via an oscilloscope with a bandwidth of 1 GHz and a sampling rate of 5 GSPS. Despite the 250 m cable run from the detectors to the oscilloscope, single MIPs were resolved with a 2 ns rise time, a pulse width of 10 ns and a time resolution of less than 1 ns. Two modes of operation were applied. For the analysis of unexpected beam aborts, the loss profile was recorded in a 1 ms buffer and, for nominal operation, the histogram of the time structure of the losses was recorded in synchronism with the LHC period of 89.2 μs. Measurements during the LHC start-up (February to December 2010) are presented. The Diamond Monitors gave an unprecedented insight into the time structure of the beam losses resolving the 400 MHz RF frequency as well as the nominal bunch separation of 25 ns. In future, these detectors will be used to study ghost bunches and particles in the 3 μs abort gap.

MOPD76

The Petra III Fast Orbit Feedback System

feedback, controls, injection, brilliance

221

J. Klute, K. Balewski, H.T. Duhme, H. Tiessen, F. Wierzcholek
DESY, Hamburg, Germany

Orbit stability is a crucial and import issue of 3rd generation light sources. Ambient mechanical and electrical noise cause rather large orbit distortions which have to be counteracted by an orbit feedback. Extensive studies of the orbit distortions in PETRA III have shown that the frequencies of the ambient noise lie within a frequency range from about 0.01Hz to 100Hz. In this paper we describe the main components, their properties and the layout of PETRA III’s orbit feedback. Furthermore experimental results on short and long term stability will be presented. It will be shown that the required orbit stability of ±0.5 μm in the vertical plane can be maintained over 50 h.

TUOB01

Options for Next Generation Digital Acquisition Systems

controls, factory, target, insertion

289

A. Boccardi
CERN, Geneva, Switzerland

Digital acquisition system designers have an always increasing number of options in terms of bus standards and digital signal processing hardware among which to choose. This allows for a high flexibility but also open the door to a proliferation of different architectures, potentially limiting the reusability and the design synergies among the various instrumentation groups. This contribution illustrates the design trends in some of the major institutes around the world with design examples including VME, PCI and μTCA based modular systems using AMC and/or FMC mezzanines. Some examples of FPGA design practices aimed to increase reusability of code will be mentioned together with some of the tools already available to designers to improve the information exchange and the collaboration, like the Open Hardware Repository project.

Slides TUOB01 [3.543 MB]

TUOC01

Highlights from the 2010 Beam Instrumentation Workshop

ion, ECR, linac, ion-source

297

J.D. Gilpatrick
LANL, Los Alamos, New Mexico, USA

Funding: Work supported by the U.S. Department of Energy.
The 14th Beam Instrumentation Workshop (BIW10) was hosted by the Los Alamos National Laboratory and was held in the La Fonda Hotel in downtown Santa Fe, NM, USA from May 3 – 6, 2010. At BIW10, there were a record amount of participants including 177 registered attendees, 92 poster presentations, and 22 companies represented. The oral presentations included 3 tutorials, 8 invited, 10 contributed, a Faraday Cup Award, 2 Vendor Technical, and 1 Special. This oral presentation provides an overview of beam instrumentation areas of interest, which were discussed during the workshop. From a selection of the BIW10 presented papers, a number of technical highlights will also be described. Finally, this oral presentation will briefly discuss the BIW10 Thursday afternoon tour that took place at the Los Alamos Neutron Science Center.

Slides TUOC01 [3.110 MB]

TUPD21

Frontend Measurements and Optimizations at Libera Brilliance BPM Electronics during Commissioning of the Petra III Synchrotron Light Source

brilliance, controls, feedback, synchrotron

350

F. Schmidt-Föhre, G. Kube, J.M. Maass, K. Wittenburg
DESY, Hamburg, Germany

New 3rd generation synchrotron light sources like Petra III utilize high-accuracy beam position measurement (BPM) systems to achieve the desired precision for beam position measurement and control, as needed for electron/positron beam stability and brilliance of the delivered photon beam. To reach the design goals, specifically adapted and parameterized commercial-of-the-shelf (COTS) Libera Brilliance BPM processor electronics are used within the Petra III BPM system. Quality of the acquired position measurement and orbit control data is highly dependent on the properties and setup of the analog and digital frontend of such BPM electronics. This paper shows influences and optimizations at the BPM system frontend of the Petra III light-source in reference to corresponding measurements done during the accelerator commissioning phase.

TUPD25

Design of Magnetic BPM and Error Corrections

electron, simulation, shielding, vacuum

359

M. Shafiee, E. Ebrahimi, S.A.H. Feghhi
Shahid Beheshti University, Evin, Tehran, Iran

For beam position monitoring (BPM) purposes, two prominent approaches as a physical effect have been applied including electrostatic and magnetic. In electrostatic types, secondary emission from the electrodes can be a problem when strong beam loss occurs, in such a situation, a magnetic BPM may be chosen. For this purpose we made a magnetic BPM including a square shape of ferromagnetic core with winding on each side. In this case study we used it for detecting the position of wire which is including a pulsed current (as an electron bunch) produced by a PROTEK G305 pulse generator. A Tektronix 2235A oscilloscope was calibrated and used to measure the induced voltage of magnetic BPM. Measurement results have been compared with simulation using CST software and performed error corrections which are presented, with this regard we could measure the wire position with high resolution furthermore we deduced the wire position hasn’t linear relation with induced voltage and needs more physical and mathematical analyzing. This way propose us that we can use magnetic BPMs in this approach and calibrate them before installing on accelerators.

Poster TUPD25 [0.120 MB]

TUPD55

Performance of the Time Resolved Spectrometer for the 5 MeV Photo-Injector PHIN

vacuum, impedance, dipole, electron

431

D. Egger
EPFL, Lausanne, Switzerland
A.E. Dabrowski, M. Divall Csatari, S. Döbert, D. Egger, T. Lefèvre, O. Mete, M. Olvegård, M. Petrarca
CERN, Geneva, Switzerland

The PHIN photo-injector test facility is being commissioned at CERN in order to fulfill the beam parameter requirements for the 3rd CLIC Test Facility (CTF3), which includes the production of a 3.5 Amp stable beam, bunched at 1.5 GHz with a relative energy spread of less than 1%. A 90° spectrometer is instrumented with an OTR screen coupled to a gated intensified camera, followed by a segmented beam dump for time resolved energy measurements. The following paper describes the transverse and temporal resolution of the instrumentation with an outlook towards single-bunch energy measurements.

Poster TUPD55 [0.959 MB]

TUPD92

SPIRAL2 Beam Energy Measurement

pick-up, simulation, linac, rfq

524

W. Le Coz, T.A. André, C. Doutresssoulles, C. Jamet, S. Loret
GANIL, Caen, France

In order to produce high intensity exotic beams in the existing experimental rooms of the GANIL facility, the SPIRAL2 project is under development and under construction at GANIL. The first phase of the SPIRAL2 project consists to build a new accelerator composed of two sources, an ion source and a proton/neutron source, a RFQ and a superconducting Linac. The linac is designed to accelerate 5 mA deuterons up to 40 MeV and 1 mA heavy ions up to 14.5 MeV/u. A new electronic device has been developed at GANIL to measure phase and amplitude of pick-up signals and calculate the beam energy. The principle consists of directly digitizing the pick-up pulses by under-sampling. The Phase and amplitude of different harmonics are then calculated with a FPGA by an I/Q method before the beam energy calculation. This paper gives results of the peak-up tests in laboratory and the comparisons with simulations. The tests in laboratory and on the GANIL accelerator of an electronic prototype are shown and presented.

WEOD02

LHC Beam Diagnostics - the Users Point of View

luminosity, proton, ion, injection

580

J. Wenninger
CERN, Geneva, Switzerland

The LHC started up with beam in November 2009, and within less then on year its luminosity reached 2·10³² cm^-2s⁻¹ at 3.5 TeV in October 2010. A few weeks later, in November 2010, lead ion collisions were established within little over 2 days. The fast progress and successes of the LHC commissioning and early operation would not have been possible without the excellent performance of its beam instrumentation. All essential instruments worked from the first day or were commissioned in a very short time, providing rapid diagnostics for the beam parameters. Tune and orbit feedbacks that rely on high quality measurements were used early on to achieve smooth operation with minimal beam losses. This presentation will address the performance of the LHC beam instrumentation, in particular the very large beam position and beam loss monitoring systems, both composed of many thousand channels. Present limitations and future improvements will also be discussed.

Slides WEOD02 [11.950 MB]