IBIC2014 - List of Keywords (gun)

Paper	Title	Other Keywords	Page
MOPF05	Instrumentation for the Proposed Low Energy RHIC Electron Cooling Project with Energy Recovery	electron, ion, emittance, linac	49
	D.M. Gassner, A.V. Fedotov, R.L. Hulsart, D. Kayran, V. Litvinenko, R.J. Michnoff, T.A. Miller, M.G. Minty, I. Pinayev, M. Wilinski BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy There is a strong interest in running RHIC at low ion beam energies of 7.7-20 GeV/nucleon [1]; this is much lower than the typical operations with 100 GeV/nucleon. The primary motivation for this effort is to explore the existence and location of the critical point on the QCD phase diagram. Electron cooling can increase the average integrated luminosity and increase the length of the stored lifetime. A cooling system is being designed that will provide a 30 – 50 mA electron beam with adequate quality and an energy range of 1.6 – 5 MeV. The cooling facility is planned to be inside the RHIC tunnel. The injector will include a 704 MHz SRF gun, a 704 MHz 5-cell SRF cavity followed by a normal conducting 2.1 GHz cavity. Electrons from the injector will be transported to the Yellow RHIC ring to allow electron-ion co-propagation for ~20 m, then a 180 degree U-turn electron transport so the same electron beam can similarly cool the Blue ion beam. After the cooling process with electron beam energies of 1.6 to 2 MeV, the electrons will be transported directly to a dump. When cooling with higher energy electrons between 2 and 5 MeV, after the cooling process, they will be routed through the acceleration cavity again to allow energy recovery and less power deposited in the dump. Special consideration is given to ensure overlap of electron and ion beams in the cooling section and achieving the requirements needed for cooling. The instrumentation systems described will include current transformers, beam position monitors, profile monitors, an emittance slit station, recombination and beam loss monitors.
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MOPF27	Simulation and First Results of the ELBE SRF Gun II	laser, SRF, simulation, cavity	106
	P.N. Lu, A. Arnold, U. Lehnert, P. Murcek, J. Teichert, H. Vennekate, R. Xiang HZDR, Dresden, Germany
	In Rossendorf, a 3 and one half cell cavity SRF photo injector has been installed, which promises to accelerate the electron beam to 9 MeV in 0.5 meter. The gun is expected to operate both in the 13 MHz mode with a bunch charge of 77 pC, or in the 500 kHz mode, with a 1 nC charge. The simulation presented in this contribution includes particle tracking in the new cavity itself with the ASTRA code, and in the bunch transport line in the ELBE beam lines with the elegant code. The measured profile and time structure of the UV laser on the cathode are utilized to specify the electron bunch parameters. Then a single bunch of electrons is tracked in the cavity field that was calculated by Superfish, with space charge effects considered. From the exit of the cavity, the electron bunch has a relatively high energy so we ignore the space charge effect there and apply elegant to track the particles through the magnet elements and accelerator modules. The main purpose of this simulation is to find the optimized parameters for different beam transport tasks. As a first experimental result of the photoinjector, energy and phase space measurement will be also presented in the paper. Both the slit mask and the quadrupole scan methods are applied to measure the beam emittance. An obvious progression will be to compare the results from this gun with those from the ELBE SRF gun I.
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MOPD09	Longitudinal Phase Space Tomography Using a Booster Cavity at the Photo Injector Test Facility at DESY, Zeuthen Site (PITZ)	laser, booster, electron, acceleration	161
	D. Malyutin, M. Groß, I.I. Isaev, M. Khojoyan, G. Kourkafas, M. Krasilnikov, B. Marchetti, F. Stephan, G. Vashchenko DESY Zeuthen, Zeuthen, Germany
	One of the ways to measure the longitudinal phase space of the electron bunch in a linear accelerator is a tomographic technique based on measurements of the bunch momentum spectra while varying the bunch energy chirp. The energy chirp at PITZ can be controlled by varying the RF phase of the CDS booster – the accelerating structure installed downstream the electron source (RF gun). The resulting momentum distribution can be measured with a dipole spectrometer downstream. As a result, the longitudinal phase space at the entrance of the CDS booster can be reconstructed. In this paper the tomographic technique for longitudinal phase space measurements is described. Results of measurements at PITZ are presented and discussed.
	Poster MOPD09 [0.925 MB]
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TUPF26	Linear Focal Cherenkov-Ring Camera for Single Shot Observation of Longitudinal Phase Space Distribution for Non-Relativistic Electron Beam	electron, vacuum, laser, photon	385
	K. Nanbu, H. Hama, F. Hinode, S. Kashiwagi, A. Lueangaramwong, T. Muto, I. Nagasawa, S. Nagasawa, Y. Shibasaki, K. Takahashi, C. Tokoku Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
	A test accelerator for the coherent THz source (t-ACTS) has been constructed at Tohoku University, in which the generation of intense coherent THz radiation from sub-picosecond electron bunches will be demonstrated. The final electron bunch length of accelerated beam is mostly dictated by the longitudinal phase space distribution at the exit of electron-gun. Therefore, measurement of Initial electron distribution in the longitudinal phase space produced by an electron gun is crucial for stable production of very short electron bunches, However, measurement of the longitudinal phase space of a relatively lower energy electron beam is especially difficult because space charge effects in drift spaces for measurement system might be strong. A method for measurement of electron energy (or momentum) applying velocity dependence of the opening angle of Cherenkov radiation in the radiator has been proposed for relatively lower energy electrons. Combined use of a streak camera and the “turtle-back” mirror that confines the Cherenkov light onto a linear focal line may allow us to observe the longitudinal phase space distribution directly. Current status of the system development will be reported in this conference.
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TUPD02	Electron Beam Profiler for the Fermilab Main Injector	electron, proton, simulation, ion	398
	R.M. Thurman-Keup, M.L. Alvarez, J. Fitzgerald, C.E. Lundberg, P.S. Prieto Fermilab, Batavia, Illinois, USA W. Blokland ORNL, Oak Ridge, Tennessee, USA
	The long range plan for Fermilab calls for large proton beam intensities in excess of 2 MW for use in the neutrino program. Measuring the transverse profiles of these high intensity beams is challenging and generally relies on non-invasive techniques. One such technique involves measuring the deflection of a beam of electrons with a trajectory perpendicular to the proton beam. A device such as this is already in use at the Spallation Neutron Source at ORNL and a similar device will be installed shortly in the Fermilab Main Injector. The Main Injector device is discussed in detail and some test results and simulations are shown.
	Poster TUPD02 [2.115 MB]
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WEPF05	Simulation of the Beam Dump for a High Intensity Electron Gun	electron, simulation, scattering, collider	536
	A. Jeff, S. Döbert, T. Lefèvre CERN, Geneva, Switzerland A. Jeff The University of Liverpool, Liverpool, United Kingdom K. Pepitone CEA, LE BARP cedex, France
	The CLIC Drive Beam is a high-intensity pulsed electron beam. A test facility for the Drive Beam electron gun will soon be commissioned at CERN. In this contribution we outline the design of a beam dump / Faraday cup capable of resisting the beam’s thermal load. The test facility will operate initially up to 140 keV. At such low energies, the electrons are absorbed very close to the surface of the dump, leading to a large energy deposition density in this thin layer. In order not to damage the dump, the beam must be spread over a large surface. For this reason, a small-angled cone has been chosen. Simulations using geant4 have been performed to estimate the distribution of energy deposition in the dump. The heat transport both within the electron pulse and between pulses has been modelled using finite element methods to check the resistance of the dump at high repetition rates. In addition, the possibility of using a moveable dump to measure the beam profile and emittance is discussed.
	Poster WEPF05 [0.224 MB]
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WEPF15	Status of the Standard Diagnostic Systems of the European XFEL	diagnostics, cavity, electronics, undulator	569
	D. Nölle DESY, Hamburg, Germany
	The European XFEL, an X-ray free-electron-laser user facility based on a 17.5 GeV superconducting LINAC, is currently under construction close to the DESY site at Hamburg. DESY is in charge of the construction of the accelerator. This contribution will report the status of the standard diagnostic systems of this facility. The design phase has finished for all main systems; most of the components are in production or are already produced. This paper will show details of the main systems, their installation issues and will report on the further time schedule. Furthermore, the experience from the commissioning of the RF gun with beam will be reported.
	Poster WEPF15 [5.427 MB]
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WEPF19	Fast Transverse Phase Space Measurement System for GunLab - A Compact Test Beamline for SRF Photoinjectors	emittance, electron, quadrupole, SRF	588
	J. Völker, T. Kamps HZB, Berlin, Germany
	Superconducting radiofrequency photo electron injectors (SRF guns) are promising electron sources for the next generation of electron linear accelerators. The energy recovery linac (ERL) BERLinPro will employ a 1.5 cell 1.3 GHz SRF gun cavity with normal conducting high quantum efficiency photocathode to produce a 100mA CW electron beam with high brightness. We are currently working on a compact test beamline (GunLab) to investigate the properties of the electron beam and to optimize the drive laser as well RF parameters. The motivation for GunLab is to decouple the SRF gun development from the ERL development. The goal is to measure not only the complete 6 dimensional phase space of the extracted and accelerated bunches but also to investigate dark current and beam halo. In this paper we will discuss unique features of GunLab for the phase space measurements.
	Poster WEPF19 [2.025 MB]
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WEPD08	Beam Jitter Spectra Measurements of the APEX Photoinjector	laser, feedback, timing, electron	652
	H.J. Qian, J.M. Byrd, L.R. Doolittle, Q. Du, D. Filippetto, G. Huang, F. Sannibale, R.P. Wells LBNL, Berkeley, California, USA J. Yang TUB, Beijing, People's Republic of China
	High repetition rate photoinjectors such as the APEX at LBNL are one of the enabling technologies for next generation MHz XFELs. Due to the higher repetition rate, a wider bandwidth is available for feedback systems to achieve ultra-stable beam performance. In a first step to improve APEX beam stability, the noise power spectra of the APEX laser beam and electron beam are characterized in terms of intensity and timing. Possible feedback systems are also discussed.
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Paper

Title

Other Keywords

Page

MOPF05

Instrumentation for the Proposed Low Energy RHIC Electron Cooling Project with Energy Recovery

electron, ion, emittance, linac

49

D.M. Gassner, A.V. Fedotov, R.L. Hulsart, D. Kayran, V. Litvinenko, R.J. Michnoff, T.A. Miller, M.G. Minty, I. Pinayev, M. Wilinski
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
There is a strong interest in running RHIC at low ion beam energies of 7.7-20 GeV/nucleon [1]; this is much lower than the typical operations with 100 GeV/nucleon. The primary motivation for this effort is to explore the existence and location of the critical point on the QCD phase diagram. Electron cooling can increase the average integrated luminosity and increase the length of the stored lifetime. A cooling system is being designed that will provide a 30 – 50 mA electron beam with adequate quality and an energy range of 1.6 – 5 MeV. The cooling facility is planned to be inside the RHIC tunnel. The injector will include a 704 MHz SRF gun, a 704 MHz 5-cell SRF cavity followed by a normal conducting 2.1 GHz cavity. Electrons from the injector will be transported to the Yellow RHIC ring to allow electron-ion co-propagation for ~20 m, then a 180 degree U-turn electron transport so the same electron beam can similarly cool the Blue ion beam. After the cooling process with electron beam energies of 1.6 to 2 MeV, the electrons will be transported directly to a dump. When cooling with higher energy electrons between 2 and 5 MeV, after the cooling process, they will be routed through the acceleration cavity again to allow energy recovery and less power deposited in the dump. Special consideration is given to ensure overlap of electron and ion beams in the cooling section and achieving the requirements needed for cooling. The instrumentation systems described will include current transformers, beam position monitors, profile monitors, an emittance slit station, recombination and beam loss monitors.

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MOPF27

Simulation and First Results of the ELBE SRF Gun II

laser, SRF, simulation, cavity

106

P.N. Lu, A. Arnold, U. Lehnert, P. Murcek, J. Teichert, H. Vennekate, R. Xiang
HZDR, Dresden, Germany

In Rossendorf, a 3 and one half cell cavity SRF photo injector has been installed, which promises to accelerate the electron beam to 9 MeV in 0.5 meter. The gun is expected to operate both in the 13 MHz mode with a bunch charge of 77 pC, or in the 500 kHz mode, with a 1 nC charge. The simulation presented in this contribution includes particle tracking in the new cavity itself with the ASTRA code, and in the bunch transport line in the ELBE beam lines with the elegant code. The measured profile and time structure of the UV laser on the cathode are utilized to specify the electron bunch parameters. Then a single bunch of electrons is tracked in the cavity field that was calculated by Superfish, with space charge effects considered. From the exit of the cavity, the electron bunch has a relatively high energy so we ignore the space charge effect there and apply elegant to track the particles through the magnet elements and accelerator modules. The main purpose of this simulation is to find the optimized parameters for different beam transport tasks. As a first experimental result of the photoinjector, energy and phase space measurement will be also presented in the paper. Both the slit mask and the quadrupole scan methods are applied to measure the beam emittance. An obvious progression will be to compare the results from this gun with those from the ELBE SRF gun I.

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MOPD09

Longitudinal Phase Space Tomography Using a Booster Cavity at the Photo Injector Test Facility at DESY, Zeuthen Site (PITZ)

laser, booster, electron, acceleration

161

D. Malyutin, M. Groß, I.I. Isaev, M. Khojoyan, G. Kourkafas, M. Krasilnikov, B. Marchetti, F. Stephan, G. Vashchenko
DESY Zeuthen, Zeuthen, Germany

One of the ways to measure the longitudinal phase space of the electron bunch in a linear accelerator is a tomographic technique based on measurements of the bunch momentum spectra while varying the bunch energy chirp. The energy chirp at PITZ can be controlled by varying the RF phase of the CDS booster – the accelerating structure installed downstream the electron source (RF gun). The resulting momentum distribution can be measured with a dipole spectrometer downstream. As a result, the longitudinal phase space at the entrance of the CDS booster can be reconstructed. In this paper the tomographic technique for longitudinal phase space measurements is described. Results of measurements at PITZ are presented and discussed.

Poster MOPD09 [0.925 MB]

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TUPF26

Linear Focal Cherenkov-Ring Camera for Single Shot Observation of Longitudinal Phase Space Distribution for Non-Relativistic Electron Beam

electron, vacuum, laser, photon

385

K. Nanbu, H. Hama, F. Hinode, S. Kashiwagi, A. Lueangaramwong, T. Muto, I. Nagasawa, S. Nagasawa, Y. Shibasaki, K. Takahashi, C. Tokoku
Tohoku University, Research Center for Electron Photon Science, Sendai, Japan

A test accelerator for the coherent THz source (t-ACTS) has been constructed at Tohoku University, in which the generation of intense coherent THz radiation from sub-picosecond electron bunches will be demonstrated. The final electron bunch length of accelerated beam is mostly dictated by the longitudinal phase space distribution at the exit of electron-gun. Therefore, measurement of Initial electron distribution in the longitudinal phase space produced by an electron gun is crucial for stable production of very short electron bunches, However, measurement of the longitudinal phase space of a relatively lower energy electron beam is especially difficult because space charge effects in drift spaces for measurement system might be strong. A method for measurement of electron energy (or momentum) applying velocity dependence of the opening angle of Cherenkov radiation in the radiator has been proposed for relatively lower energy electrons. Combined use of a streak camera and the “turtle-back” mirror that confines the Cherenkov light onto a linear focal line may allow us to observe the longitudinal phase space distribution directly. Current status of the system development will be reported in this conference.

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

TUPD02

Electron Beam Profiler for the Fermilab Main Injector

electron, proton, simulation, ion

398

R.M. Thurman-Keup, M.L. Alvarez, J. Fitzgerald, C.E. Lundberg, P.S. Prieto
Fermilab, Batavia, Illinois, USA
W. Blokland
ORNL, Oak Ridge, Tennessee, USA

The long range plan for Fermilab calls for large proton beam intensities in excess of 2 MW for use in the neutrino program. Measuring the transverse profiles of these high intensity beams is challenging and generally relies on non-invasive techniques. One such technique involves measuring the deflection of a beam of electrons with a trajectory perpendicular to the proton beam. A device such as this is already in use at the Spallation Neutron Source at ORNL and a similar device will be installed shortly in the Fermilab Main Injector. The Main Injector device is discussed in detail and some test results and simulations are shown.

Poster TUPD02 [2.115 MB]

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WEPF05

Simulation of the Beam Dump for a High Intensity Electron Gun

electron, simulation, scattering, collider

536

A. Jeff, S. Döbert, T. Lefèvre
CERN, Geneva, Switzerland
A. Jeff
The University of Liverpool, Liverpool, United Kingdom
K. Pepitone
CEA, LE BARP cedex, France

The CLIC Drive Beam is a high-intensity pulsed electron beam. A test facility for the Drive Beam electron gun will soon be commissioned at CERN. In this contribution we outline the design of a beam dump / Faraday cup capable of resisting the beam’s thermal load. The test facility will operate initially up to 140 keV. At such low energies, the electrons are absorbed very close to the surface of the dump, leading to a large energy deposition density in this thin layer. In order not to damage the dump, the beam must be spread over a large surface. For this reason, a small-angled cone has been chosen. Simulations using geant4 have been performed to estimate the distribution of energy deposition in the dump. The heat transport both within the electron pulse and between pulses has been modelled using finite element methods to check the resistance of the dump at high repetition rates. In addition, the possibility of using a moveable dump to measure the beam profile and emittance is discussed.

Poster WEPF05 [0.224 MB]

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WEPF15

Status of the Standard Diagnostic Systems of the European XFEL

diagnostics, cavity, electronics, undulator

569

D. Nölle
DESY, Hamburg, Germany

The European XFEL, an X-ray free-electron-laser user facility based on a 17.5 GeV superconducting LINAC, is currently under construction close to the DESY site at Hamburg. DESY is in charge of the construction of the accelerator. This contribution will report the status of the standard diagnostic systems of this facility. The design phase has finished for all main systems; most of the components are in production or are already produced. This paper will show details of the main systems, their installation issues and will report on the further time schedule. Furthermore, the experience from the commissioning of the RF gun with beam will be reported.

Poster WEPF15 [5.427 MB]

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WEPF19

Fast Transverse Phase Space Measurement System for GunLab - A Compact Test Beamline for SRF Photoinjectors

emittance, electron, quadrupole, SRF

588

J. Völker, T. Kamps
HZB, Berlin, Germany

Superconducting radiofrequency photo electron injectors (SRF guns) are promising electron sources for the next generation of electron linear accelerators. The energy recovery linac (ERL) BERLinPro will employ a 1.5 cell 1.3 GHz SRF gun cavity with normal conducting high quantum efficiency photocathode to produce a 100mA CW electron beam with high brightness. We are currently working on a compact test beamline (GunLab) to investigate the properties of the electron beam and to optimize the drive laser as well RF parameters. The motivation for GunLab is to decouple the SRF gun development from the ERL development. The goal is to measure not only the complete 6 dimensional phase space of the extracted and accelerated bunches but also to investigate dark current and beam halo. In this paper we will discuss unique features of GunLab for the phase space measurements.

Poster WEPF19 [2.025 MB]

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WEPD08

Beam Jitter Spectra Measurements of the APEX Photoinjector

laser, feedback, timing, electron

652

H.J. Qian, J.M. Byrd, L.R. Doolittle, Q. Du, D. Filippetto, G. Huang, F. Sannibale, R.P. Wells
LBNL, Berkeley, California, USA
J. Yang
TUB, Beijing, People's Republic of China

High repetition rate photoinjectors such as the APEX at LBNL are one of the enabling technologies for next generation MHz XFELs. Due to the higher repetition rate, a wider bandwidth is available for feedback systems to achieve ultra-stable beam performance. In a first step to improve APEX beam stability, the noise power spectra of the APEX laser beam and electron beam are characterized in terms of intensity and timing. Possible feedback systems are also discussed.

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)