IBIC2016 - List of Keywords (dipole)

Paper	Title	Other Keywords	Page
MOAL02	Diagnostics at the Max IV 3 GeV Storage Ring During Commissioning	emittance, diagnostics, storage-ring, linac	1
	Å. Andersson, J. Breunlin, B.N. Jensen, R. Lindvall, E. Mansten, D. Olsson, J. Sundberg, P.F. Tavares, S. Thorin MAX IV Laboratory, Lund University, Lund, Sweden
	The MAX IV 3 GeV storage ring based on a multibend achromat lattice allowing for horizontal emittances from 330 pm rad down to 180 pm rad, depending on the number of insertion devices. The diagnostics used during commissioning will be described, with emphasis on the emittance diagnostics This will involve two diagnostic beam lines to image the electron beam with infrared and ultraviolet synchrotron radiation from bending dipoles, in order to determine also beam energy spread. The scheme for horizontal emittance measurements looks promising also for an order of magnitude lower emittance. Bunch lengthening with harmonic cavities is essential for the low emittance machine performance. We have used a radiation based sampling technique to verify individual bunch distributions.
	Slides MOAL02 [2.820 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOAL02
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MOPG12	A Wire-Based Methodology to Analyse the Nanometric Resolution of an RF Cavity BPM	cavity, experiment, software, alignment	63
	S. Zorzetti, K. Artoos, F.N. Morel, P. Novotny, D. Tshilumba, M. Wendt CERN, Geneva, Switzerland L. Fanucci Università di Pisa, Pisa, Italy
	Funding: The PACMAN project is funded by the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 606839 Resonant Cavity Beam Position Monitors (RF-BPMs) are diagnostic instruments capable of achieving beam position resolutions down to the nanometre scale. To date, their nanometric resolution capabilities have been predicted by simulation and verified through beam-based measurements with particle beams. In the frame of the PACMAN project at CERN, an innovative methodology has been developed to directly observe signal variations corresponding to nanometric displacements of the BPM cavity with respect to a conductive stretched wire. The cavity BPM of this R&D study operates at the TM110 dipole mode frequency of 15GHz. The concepts and details of the RF stretched wire BPM test-bench to achieve the best resolution results are presented, along with the required control hardware and software.
	Poster MOPG12 [1.692 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG12
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MOPG47	Beta Function Measurement for the AGS IPM	emittance, flattop, betatron, proton	157
	H. Huang, L. Ahrens, C.E. Harper, F. Méot, V. Schoefer BNL, Upton, Long Island, New York, USA
	Emittance control is important for polarization preservation of proton beam in the Alternative Gradient Synchrotron (AGS). For polarization preservation, two helical dipole partial snake magnets are inserted into the AGS lattice. In addition, the vertical tune has to run very high, in the vicinity of integer. These helical dipole magnets greatly distort the optics, especially near injection. The beta functions along the energy ramp have been modeled and measured at the locations of the Ion Profile Monitor (IPM). For the measurements to be valid, the betatron tune, dipole current and orbit responses have to be carefully measured. This paper summarize the experiment results and comparison with the model. These results will lead to understanding of emittance evolution in the AGS.
	Poster MOPG47 [2.033 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG47
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MOPG61	AXD Measurements at SOLEIL	electron, radiation, vacuum, photon	209
	M. Labat, M. El Ajjouri, N. Hubert, D. Pédeau, M. Ribbens, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France
	A first prototype of in-Air X-ray Detector (AXD) has been installed on the SOLEIL storage ring. An AXD simply consists of a scintillator, an objective and a camera installed in air behind the absorber of the bending magnet's synchrotron radiation layer. The radiation vertical profile analysis easily enables to retrieve the vertical beam size of the electron beam at the source point. This simple diagnostics opens large perspectives of beam size measurement all around the ring for an accurate caracterization of the beam and improvment of its stability survey.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG61
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TUPG01	Beam Based Calibration of a Rogowski Coil Used as a Horizontal and Vertical Beam Position Monitor	factory, storage-ring, pick-up, synchrotron	302
	F. Trinkel, F. Hinder, D. Shergelashvili, H. Soltner FZJ, Jülich, Germany F. Hinder RWTH, Aachen, Germany
	Electric Dipole Moments (EDMs) violate parity and time reversal symmetries. Assuming the CPT-theorem, this leads to CP violation, which is needed to explain the matter over antimatter dominance in the Universe. So far no direct EDM measurement for charged hadrons have been performed. The goal of the JEDI collaboration (Jülich Electric Dipole moment Investigations) is to measure the EDM of charged particles. The measurement of EDMs of charged hadrons can be performed in storage rings by observing a polarization build-up proportional to the EDM. Due to the smallness of the effect many systematic effects leading to a fake build-up have to be studied. A first step on the way for an EDM measurement is the investigation of systematic errors at the storage ring COSY (COoler SYnchrotron). One part of these studies is the control of the beam orbit with high precession. Therefore a concept of new Beam Position Monitors (BPMs) based on magnetic pick-up coils are used. The main advantage of the coil design is the high response to bunched beam frequency signal and the compactness of the coil itself. First measurement results of such a BPM accelerator environment will be presented.
	Poster TUPG01 [1.827 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG01
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TUPG08	Design of the Transverse Feedback Kicker for ThomX	impedance, kicker, simulation, feedback	329
	M. El Ajjouri, N. Hubert, A. Loulergue, R. Sreedharan SOLEIL, Gif-sur-Yvette, France D. Douillet, A.R. Gamelin, D. Le Guidec LAL, Orsay, France
	ThomX is a Compton source project in the range of the hard X rays to be installed in 2017. The machine is composed of an injector Linac and a storage ring where an electron bunch collides with a laser pulse accumulated in a FabryPerot resonator. The final goal is to provide an X-rays average flux of 1011Ã·10¹³ ph/s. To achieve this target, it is required to install a transverse feedback system to suppress instabilities generated by injection position jitter sources, resistive wall impedance or collective effects. This paper describes the design and simulation studies of the stripline kicker that will be used for the transverse feedback system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG08
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TUPG10	LCLS-1 Cavity BPM Algorithm for Unlocked Digitizer Clock	cavity, detector, timing, operation	336
	T. Straumann, S.R. Smith SLAC, Menlo Park, California, USA
	Funding: Work supported by U.S. Department of Energy Contract No. DE-AC02-76SF00515 Cavity BPMs commonly use the fundamental TM010 mode (excited either in the x/y cavity itself or in a separate "reference" cavity) which is insensitive to beam position as a reference signal, not only for amplitude normalization but also as a phase/time reference to facilitate synchronous detection of the signal derived from the position-sensitive TM110 mode. When taking these signals into the digital domain the reference and position signals need to be acquired by a synchronous clock. However, unless this clock is also locked to the accelerating RF, absolute timing information is lost which affects the relative phase between reference and position signals (assuming they are not carefully tuned to the same frequency). This contribution presents a method for estimating the necessary time of arrival information based on the sampled reference signal which is used to make the signal detection insensitive to the phase of the digitizer clock. Running an unlocked digitizer clock allows for considerable simplification of infrastructure (cabling, PLLs) and thus decreases cost and eases maintenance.
	Poster TUPG10 [1.100 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG10
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TUPG29	The Frascati LINAC Beam-Test Facility (BTF) Performance and Upgrades	linac, target, positron, electron	395
	B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta INFN/LNF, Frascati (Roma), Italy P. Valente INFN-Roma, Roma, Italy
	Funding: Supported by the H2020 project AIDA-2020, GA no. 654168 In the last 11 years, the Beam-Test Facility (BTF) of the Frascati DAΦNE accelerator, gained an important role in the development of particle detectors. e^- or e⁺ beams can be extracted to a dedicated transfer line, where a target plus a dipole and collimator, can attenuate and select secondary particles in a narrow p (<1%) band. BTF can provide tuneable beams in a wide range of: energy (to 750 MeV/540 MeV for e⁻/e⁺), charge (up to 10¹⁰ e/bunch) and pulse length (1.4-40 ns) up to 49 Hz rep. rate. Beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad. Photons can be produced on a target, and energy-tagged inside the dipole by Si micro-strip detectors. A shielded W target is used for neutron production: about 8 10-7/pr, 1 MeV n are produced. 200 beam days are delivered to about 20 groups/year. A dedicated experiment PADME for the search of light dark matter, like dark photons, ALPs, etc., was approved aiming at a sensitivity up to m=26 MeV/c2. An upgrade program of the facility is proposed, along 3 lines: consolidation of the LINAC, in order to guarantee a stable operation in the longer term; upgrade of the energy up to 1 GeV; doubling of the BTF beam-lines.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG29
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TUPG57	5 MeV Beam Diagnostics at the Mainz Energy-Recovering Superconducting Accelerator MESA	diagnostics, cavity, detector, beam-diagnostic	479
	S. Heidrich, K. Aulenbacher IKP, Mainz, Germany
	Within the next few years a new energy recovering superconducting electron accelerator will be built at the institute for nuclear physics in Mainz. To adjust the properties of the beam correctly to the first acceleration in the superconducting cavities, a high resolution longitudinal beam diagnosis is required at the 5 MeV injection arc. The system employs two 90-degree vertical deflection dipoles to achieve an energy resolution of 500 eV and a phase resolution of 60 micrometers. As a second challenge the transverse emittance measurements will take place at full beam current. This demands an extremely heat resistant diagnosis system, realized by a method similar to flying wire.
	Poster TUPG57 [6.090 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG57
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WEPG03	HOM Characterization for Beam Diagnostics at the European XFEL Injector	HOM, cavity, monitoring, electron	616
	N. Baboi, T. Hellert, L. Shi, T. Wamsat DESY, Hamburg, Germany R.M. Jones, N.Y. Joshi, L. Shi UMAN, Manchester, United Kingdom N.Y. Joshi University of Manchester, Manchester, United Kingdom
	Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 31245. Higher Order Modes (HOM) excited by bunched elec-tron beams in accelerating cavities carry information about the beam position and phase. This principle is used at the FLASH facility, at DESY, for beam position monitoring in 1.3 and 3.9 GHz cavities. Dipole modes, which depend on the beam offset, are used. Similar monitors are now under design for the European XFEL. In addition to beam position, the beam phase with respect to the accelerating RF will be monitored using monopole modes from the first higher order monopole band. The HOM signals are available from two couplers installed on each cavity. Their monitoring will allow the on-line tracking of the phase stability over time, and we anticipate that it will improve the stability of the facility. As part of the monitor designing, the HOM spectra in the cavities of the 1.3 and 3.9 GHz cryo-modules installed in the European XFEL injector have been measured. This paper will present their dependence on the beam position. The variation in the modal distribution from cavity to cavity will be discussed. Based on the results, initial phase measurements based on a fast oscilloscope have been made.
	Poster WEPG03 [3.281 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG03
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WEPG19	Conceptual Design of LEReC Fast Machine Protection System	laser, gun, electron, vacuum	665
	S. Seletskiy, Z. Altinbas, M.R. Costanzo, A.V. Fedotov, D.M. Gassner, L.R. Hammons, J. Hock, P. Inacker, J.P. Jamilkowski, D. Kayran, K. Mernick, T.A. Miller, M.G. Minty, M.C. Paniccia, I. Pinayev, K.S. Smith, P. Thieberger, J.E. Tuozzolo, W. Xu, Z. Zhao BNL, Upton, Long Island, New York, USA
	The low energy RHIC Electron Cooling (LEReC) accelerator will be running with electron beams of up to 110 kW power with CW operation at 704MHz. Although electron energies are relatively low (< 2.6MeV), at several locations along the LEReC beamline, where the electron beam has small (about 250 um RMS radius) design size, it can potentially hit the vacuum chamber at a normal incident angle. The accelerator must be protected against such a catastrophic scenario by a dedicated machine protection system (MPS). Such an MPS shall be capable of interrupting the beam within a few tens of microseconds. In this paper we describe the current conceptual design of the LEReC MPS.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG19
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WEPG44	Longitudinal Phase Space Measurement at the ELI-NP Compton Gamma Source	linac, electron, brightness, laser	732
	L. Sabato U. Sannio, Benevento, Italy D. Alesini, G. Franzini, C. Vaccarezza, A. Variola INFN/LNF, Frascati (Roma), Italy P. Arpaia, A. Liccardo Naples University Federico II, Science and Technology Pole, Napoli, Italy A. Giribono, A. Mostacci, L. Palumbo University of Rome La Sapienza, Rome, Italy L. Sabato INFN-Napoli, Napoli, Italy
	Virtual bunch length measurement can be carried out by means of ELEGANT code for tracking the bunch particles from RF deflector to the screen. The technique relies on the correlation between the bunch longitudinal coordinate and transverse coordinates induced through a RF deflector. Therefore, the bunch length measurement can be carried out measuring the vertical spot size at the screen, placed after the RF deflector. The deflecting voltage amplitude affects the resolution. Adding a dispersive element, e.g. a magnetic dipole between RF deflector and the screen, the full longitudinal phase space can be measured. In this paper, we discuss some issues relevant for the electron linac of the Compton source at the Extreme Light Infrastructure - Nuclear Physics (ELI-NP).
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG44
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Paper

Title

Other Keywords

Page

MOAL02

Diagnostics at the Max IV 3 GeV Storage Ring During Commissioning

emittance, diagnostics, storage-ring, linac

1

Å. Andersson, J. Breunlin, B.N. Jensen, R. Lindvall, E. Mansten, D. Olsson, J. Sundberg, P.F. Tavares, S. Thorin
MAX IV Laboratory, Lund University, Lund, Sweden

The MAX IV 3 GeV storage ring based on a multibend achromat lattice allowing for horizontal emittances from 330 pm rad down to 180 pm rad, depending on the number of insertion devices. The diagnostics used during commissioning will be described, with emphasis on the emittance diagnostics This will involve two diagnostic beam lines to image the electron beam with infrared and ultraviolet synchrotron radiation from bending dipoles, in order to determine also beam energy spread. The scheme for horizontal emittance measurements looks promising also for an order of magnitude lower emittance. Bunch lengthening with harmonic cavities is essential for the low emittance machine performance. We have used a radiation based sampling technique to verify individual bunch distributions.

Slides MOAL02 [2.820 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOAL02

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MOPG12

A Wire-Based Methodology to Analyse the Nanometric Resolution of an RF Cavity BPM

cavity, experiment, software, alignment

63

S. Zorzetti, K. Artoos, F.N. Morel, P. Novotny, D. Tshilumba, M. Wendt
CERN, Geneva, Switzerland
L. Fanucci
Università di Pisa, Pisa, Italy

Funding: The PACMAN project is funded by the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 606839
Resonant Cavity Beam Position Monitors (RF-BPMs) are diagnostic instruments capable of achieving beam position resolutions down to the nanometre scale. To date, their nanometric resolution capabilities have been predicted by simulation and verified through beam-based measurements with particle beams. In the frame of the PACMAN project at CERN, an innovative methodology has been developed to directly observe signal variations corresponding to nanometric displacements of the BPM cavity with respect to a conductive stretched wire. The cavity BPM of this R&D study operates at the TM110 dipole mode frequency of 15GHz. The concepts and details of the RF stretched wire BPM test-bench to achieve the best resolution results are presented, along with the required control hardware and software.

Poster MOPG12 [1.692 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG12

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MOPG47

Beta Function Measurement for the AGS IPM

emittance, flattop, betatron, proton

157

H. Huang, L. Ahrens, C.E. Harper, F. Méot, V. Schoefer
BNL, Upton, Long Island, New York, USA

Emittance control is important for polarization preservation of proton beam in the Alternative Gradient Synchrotron (AGS). For polarization preservation, two helical dipole partial snake magnets are inserted into the AGS lattice. In addition, the vertical tune has to run very high, in the vicinity of integer. These helical dipole magnets greatly distort the optics, especially near injection. The beta functions along the energy ramp have been modeled and measured at the locations of the Ion Profile Monitor (IPM). For the measurements to be valid, the betatron tune, dipole current and orbit responses have to be carefully measured. This paper summarize the experiment results and comparison with the model. These results will lead to understanding of emittance evolution in the AGS.

Poster MOPG47 [2.033 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG47

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MOPG61

AXD Measurements at SOLEIL

electron, radiation, vacuum, photon

209

M. Labat, M. El Ajjouri, N. Hubert, D. Pédeau, M. Ribbens, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France

A first prototype of in-Air X-ray Detector (AXD) has been installed on the SOLEIL storage ring. An AXD simply consists of a scintillator, an objective and a camera installed in air behind the absorber of the bending magnet's synchrotron radiation layer. The radiation vertical profile analysis easily enables to retrieve the vertical beam size of the electron beam at the source point. This simple diagnostics opens large perspectives of beam size measurement all around the ring for an accurate caracterization of the beam and improvment of its stability survey.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG61

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TUPG01

Beam Based Calibration of a Rogowski Coil Used as a Horizontal and Vertical Beam Position Monitor

factory, storage-ring, pick-up, synchrotron

302

F. Trinkel, F. Hinder, D. Shergelashvili, H. Soltner
FZJ, Jülich, Germany
F. Hinder
RWTH, Aachen, Germany

Electric Dipole Moments (EDMs) violate parity and time reversal symmetries. Assuming the CPT-theorem, this leads to CP violation, which is needed to explain the matter over antimatter dominance in the Universe. So far no direct EDM measurement for charged hadrons have been performed. The goal of the JEDI collaboration (Jülich Electric Dipole moment Investigations) is to measure the EDM of charged particles. The measurement of EDMs of charged hadrons can be performed in storage rings by observing a polarization build-up proportional to the EDM. Due to the smallness of the effect many systematic effects leading to a fake build-up have to be studied. A first step on the way for an EDM measurement is the investigation of systematic errors at the storage ring COSY (COoler SYnchrotron). One part of these studies is the control of the beam orbit with high precession. Therefore a concept of new Beam Position Monitors (BPMs) based on magnetic pick-up coils are used. The main advantage of the coil design is the high response to bunched beam frequency signal and the compactness of the coil itself. First measurement results of such a BPM accelerator environment will be presented.

Poster TUPG01 [1.827 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG01

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TUPG08

Design of the Transverse Feedback Kicker for ThomX

impedance, kicker, simulation, feedback

329

M. El Ajjouri, N. Hubert, A. Loulergue, R. Sreedharan
SOLEIL, Gif-sur-Yvette, France
D. Douillet, A.R. Gamelin, D. Le Guidec
LAL, Orsay, France

ThomX is a Compton source project in the range of the hard X rays to be installed in 2017. The machine is composed of an injector Linac and a storage ring where an electron bunch collides with a laser pulse accumulated in a FabryPerot resonator. The final goal is to provide an X-rays average flux of 1011Ã·10¹³ ph/s. To achieve this target, it is required to install a transverse feedback system to suppress instabilities generated by injection position jitter sources, resistive wall impedance or collective effects. This paper describes the design and simulation studies of the stripline kicker that will be used for the transverse feedback system.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG08

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPG10

LCLS-1 Cavity BPM Algorithm for Unlocked Digitizer Clock

cavity, detector, timing, operation

336

T. Straumann, S.R. Smith
SLAC, Menlo Park, California, USA

Funding: Work supported by U.S. Department of Energy Contract No. DE-AC02-76SF00515
Cavity BPMs commonly use the fundamental TM010 mode (excited either in the x/y cavity itself or in a separate "reference" cavity) which is insensitive to beam position as a reference signal, not only for amplitude normalization but also as a phase/time reference to facilitate synchronous detection of the signal derived from the position-sensitive TM110 mode. When taking these signals into the digital domain the reference and position signals need to be acquired by a synchronous clock. However, unless this clock is also locked to the accelerating RF, absolute timing information is lost which affects the relative phase between reference and position signals (assuming they are not carefully tuned to the same frequency). This contribution presents a method for estimating the necessary time of arrival information based on the sampled reference signal which is used to make the signal detection insensitive to the phase of the digitizer clock. Running an unlocked digitizer clock allows for considerable simplification of infrastructure (cabling, PLLs) and thus decreases cost and eases maintenance.

Poster TUPG10 [1.100 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG10

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TUPG29

The Frascati LINAC Beam-Test Facility (BTF) Performance and Upgrades

linac, target, positron, electron

395

B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
INFN/LNF, Frascati (Roma), Italy
P. Valente
INFN-Roma, Roma, Italy

Funding: Supported by the H2020 project AIDA-2020, GA no. 654168
In the last 11 years, the Beam-Test Facility (BTF) of the Frascati DAΦNE accelerator, gained an important role in the development of particle detectors. e^- or e⁺ beams can be extracted to a dedicated transfer line, where a target plus a dipole and collimator, can attenuate and select secondary particles in a narrow p (<1%) band. BTF can provide tuneable beams in a wide range of: energy (to 750 MeV/540 MeV for e⁻/e⁺), charge (up to 10¹⁰ e/bunch) and pulse length (1.4-40 ns) up to 49 Hz rep. rate. Beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad. Photons can be produced on a target, and energy-tagged inside the dipole by Si micro-strip detectors. A shielded W target is used for neutron production: about 8 10-7/pr, 1 MeV n are produced. 200 beam days are delivered to about 20 groups/year. A dedicated experiment PADME for the search of light dark matter, like dark photons, ALPs, etc., was approved aiming at a sensitivity up to m=26 MeV/c2. An upgrade program of the facility is proposed, along 3 lines: consolidation of the LINAC, in order to guarantee a stable operation in the longer term; upgrade of the energy up to 1 GeV; doubling of the BTF beam-lines.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG29

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TUPG57

5 MeV Beam Diagnostics at the Mainz Energy-Recovering Superconducting Accelerator MESA

diagnostics, cavity, detector, beam-diagnostic

479

S. Heidrich, K. Aulenbacher
IKP, Mainz, Germany

Within the next few years a new energy recovering superconducting electron accelerator will be built at the institute for nuclear physics in Mainz. To adjust the properties of the beam correctly to the first acceleration in the superconducting cavities, a high resolution longitudinal beam diagnosis is required at the 5 MeV injection arc. The system employs two 90-degree vertical deflection dipoles to achieve an energy resolution of 500 eV and a phase resolution of 60 micrometers. As a second challenge the transverse emittance measurements will take place at full beam current. This demands an extremely heat resistant diagnosis system, realized by a method similar to flying wire.

Poster TUPG57 [6.090 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG57

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WEPG03

HOM Characterization for Beam Diagnostics at the European XFEL Injector

HOM, cavity, monitoring, electron

616

N. Baboi, T. Hellert, L. Shi, T. Wamsat
DESY, Hamburg, Germany
R.M. Jones, N.Y. Joshi, L. Shi
UMAN, Manchester, United Kingdom
N.Y. Joshi
University of Manchester, Manchester, United Kingdom

Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 31245.
Higher Order Modes (HOM) excited by bunched elec-tron beams in accelerating cavities carry information about the beam position and phase. This principle is used at the FLASH facility, at DESY, for beam position monitoring in 1.3 and 3.9 GHz cavities. Dipole modes, which depend on the beam offset, are used. Similar monitors are now under design for the European XFEL. In addition to beam position, the beam phase with respect to the accelerating RF will be monitored using monopole modes from the first higher order monopole band. The HOM signals are available from two couplers installed on each cavity. Their monitoring will allow the on-line tracking of the phase stability over time, and we anticipate that it will improve the stability of the facility. As part of the monitor designing, the HOM spectra in the cavities of the 1.3 and 3.9 GHz cryo-modules installed in the European XFEL injector have been measured. This paper will present their dependence on the beam position. The variation in the modal distribution from cavity to cavity will be discussed. Based on the results, initial phase measurements based on a fast oscilloscope have been made.

Poster WEPG03 [3.281 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG03

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WEPG19

Conceptual Design of LEReC Fast Machine Protection System

laser, gun, electron, vacuum

665

S. Seletskiy, Z. Altinbas, M.R. Costanzo, A.V. Fedotov, D.M. Gassner, L.R. Hammons, J. Hock, P. Inacker, J.P. Jamilkowski, D. Kayran, K. Mernick, T.A. Miller, M.G. Minty, M.C. Paniccia, I. Pinayev, K.S. Smith, P. Thieberger, J.E. Tuozzolo, W. Xu, Z. Zhao
BNL, Upton, Long Island, New York, USA

The low energy RHIC Electron Cooling (LEReC) accelerator will be running with electron beams of up to 110 kW power with CW operation at 704MHz. Although electron energies are relatively low (< 2.6MeV), at several locations along the LEReC beamline, where the electron beam has small (about 250 um RMS radius) design size, it can potentially hit the vacuum chamber at a normal incident angle. The accelerator must be protected against such a catastrophic scenario by a dedicated machine protection system (MPS). Such an MPS shall be capable of interrupting the beam within a few tens of microseconds. In this paper we describe the current conceptual design of the LEReC MPS.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG19

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WEPG44

Longitudinal Phase Space Measurement at the ELI-NP Compton Gamma Source

linac, electron, brightness, laser

732

L. Sabato
U. Sannio, Benevento, Italy
D. Alesini, G. Franzini, C. Vaccarezza, A. Variola
INFN/LNF, Frascati (Roma), Italy
P. Arpaia, A. Liccardo
Naples University Federico II, Science and Technology Pole, Napoli, Italy
A. Giribono, A. Mostacci, L. Palumbo
University of Rome La Sapienza, Rome, Italy
L. Sabato
INFN-Napoli, Napoli, Italy

Virtual bunch length measurement can be carried out by means of ELEGANT code for tracking the bunch particles from RF deflector to the screen. The technique relies on the correlation between the bunch longitudinal coordinate and transverse coordinates induced through a RF deflector. Therefore, the bunch length measurement can be carried out measuring the vertical spot size at the screen, placed after the RF deflector. The deflecting voltage amplitude affects the resolution. Adding a dispersive element, e.g. a magnetic dipole between RF deflector and the screen, the full longitudinal phase space can be measured. In this paper, we discuss some issues relevant for the electron linac of the Compton source at the Extreme Light Infrastructure - Nuclear Physics (ELI-NP).

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG44

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