2nd European Advanced Accelerator Concepts Workshop

Session

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

14 Sept 2015, 16:00

La Biodola, Isola d'Elba

Conveners

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

• Peter Hommelhoff (University of Erlangen and Max Planck Institute of Quantum Optics)
• Walter Wuensch (CERN)

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

• Walter Wuensch (CERN)
• Peter Hommelhoff (University of Erlangen and Max Planck Institute of Quantum Optics)

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

• Peter Hommelhoff (University of Erlangen and Max Planck Institute of Quantum Optics)
• Walter Wuensch (CERN)

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

• Peter Hommelhoff (University of Erlangen and Max Planck Institute of Quantum Optics)
• Walter Wuensch (CERN)

147. A collinear wakefield accelerator for a high repetition rate multi beamline soft x-ray free-electron laser facility

Dr Alexander Zholents (Argonne National Laboratory)

14/09/2015, 16:00

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

A concept is presented for a multi beamline soft x-ray FEL facility where several free-electron laser (FEL) undulator lines are driven by equal number of high repetition rate single-stage collinear wakefield accelerators (CWA). Various means to mitigate the adverse collective effects are considered and a practical design of the CWA, embedded into a quadrupole wiggler to control a beam breakup...

140. Measurement of 300MV/m Accelerating Gradients in a Dielectric Wakefield Accelerator

Dr Brendan O'Shea (SLAC National Accelerator Laboratory)

14/09/2015, 16:15

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

The future of electron driven light sources and colliders alike is quickly approaching a financial barrier that is only overcome by international collaborations. Size reduction of experimental systems, along with attendant reduction in cost, is one of many possible steps necessary to reaching TeV scale linear colliders and allowing for the spread of short-pulse x-ray light sources, such as...

28. High transformer ratio of multi-channel dielectric wakefield structures and real-time diagnostic for charging and damage of dielectrics

Dr Sergey Shchelkunov (Omega-P Inc)

14/09/2015, 16:30

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Dielectric wake field (DWA) accelerator concepts are receiving attention of late, on account of their promising performance, mechanical simplicity, and anticipated low cost. Interest in DWA physics directed toward an advanced high-gradient accelerator has been enhanced by a finding that some dielectrics can withstand very high fields (> 1 GV/m) for the short times during the passage of...

52. A New Technology for High Gradient Radiofrequency Photogun

David Alesini (LNF)

14/09/2015, 16:45

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

High gradient RF photoguns have been a key development to enable several applications of high quality electron beams. They allow the generation of beams with very high peak current and low transverse emittance, satisfying the tight demands for FELs, ERLs, Compton/Thomson Sources and high-energy linear colliders. In the present paper we present the design of a new RF photogun recently developed...

145. High-Gradient Normal-Conducting Radio-Frequency Photoinjector System for the STAR Project

Dr Luigi Faillace (RadiaBeam Technologies)

14/09/2015, 17:00

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Radiabeam Technologies presents the development of a high gradient normal conducting radio frequency (NCRF) 1.6 cell photoinjector system for the STAR project (Southern european Thomson source for Applied Research), in progress at the University of Calabria (Italy). The RF Gun is designed to operate with a peak accelerating electric field of 120MV/m and up to a repetition rate of 100Hz. The...

146. Experimental Results of Carbon-Nanotube Cathodes inside Radio-Frequency Environment

Dr Luigi Faillace (RadiaBeam Technologies)

14/09/2015, 17:15

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Carbon Nano Tubes (CNT’s) as field-emitters have been investigated for more than two decades and can produce relatively low emittance electron beams for a given cathode size. Unlike thermionic cathodes, CNT cathodes are able to produce electrons at room temperature and relatively low electric field (a few MV/m). In collaboration with FermiLab, we have recently tested CNT cathodes both with DC...

42. Investigations of the concept of a multibunch dielectric wakefield accelerator

Prof. ivan onishchenko (NSC KIPT)

14/09/2015, 18:00

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Theoretical and experimental investigations of the physical principles of multibunch dielectric wakefield accelerator creation that is based on wakefield excitation in the dielectric structure by a sequence of relativistic electron bunches are presented. The purpose of the concept was to enhance wakefield intensity due to multibunch coherent excitation, multimode summation of transversal...

55. High transformer ratio in dielectric wakefield structures using longitudinal bunch shaping with a emittance exchange beam line.

Mr John Power (Argonne National Laboratory)

14/09/2015, 18:15

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Two figures of merit of the collinear wakefield accelerator are the longitudinal electric field, Ez, and the transformer ratio, R, and both depend on the longitudinal bunch distribution. Precise control over the longitudinal distribution allows for optimization of the collinear wakefield accelerator for the application under consideration. A new program is under development at Argonne...

176. Dielectric wakefield accelerator experiments in modal confinement and pulse shaping

Dr Gerard Andonian (UCLA)

14/09/2015, 18:30

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Significant experimental milestones in beam-driven wakefield acceleration in dielectric structures have been demonstrated in recent years. Such experimental work is necessary to ascertain the viability of such schemes as next generation accelerators. Some outstanding issues that require further investigation include control of resonant mode confinement and enhanced energy efficiency. In this...

89. High gradient IFEL acceleration and deceleration in strongly tapered undulators.

Prof. Pietro Musumeci (UCLA)

14/09/2015, 18:45

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Efficient coupling of relativistic electron beams with high power radiation in magnetic undulators lies at the heart of advanced accelerator and light source research and development. Recent inverse free electron laser experiments using strongly tapered undulators have demonstrated high-gradient (>100 MV/m) and high energy gain (> 50 MeV) acceleration of externally injected electrons,...

12. X-band accelerator structures: on going R&D at the LNF-INFN

Dr Bruno Spataro (INFN - LNF)

14/09/2015, 19:00

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

In the framework of a large collaboration among SLAC (USA), KEK (Japan) and INFN-LNF, our laboratories have been involved in the design, manufacture and test of short high power standing wave (SW) sections operating at 11.424 GHz. Because electroforming is a very attractive technique to manufacture compact structures avoiding the soft brazing while maintaining mechanical properties and high...

51. DESIGN AND TEST OF DAMPED/HIGH GRADIENT/HIGH REPETITION RATE C-BAND ACCELERATING STRUCTURES FOR THE ELI-NP LINAC

David Alesini (LNF)

14/09/2015, 19:15

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

The linac energy booster of the European ELI-NP proposal foresees the use of 12, 1.8 m long, travelling wave C-Band structures, with a field phase advance per cell of 2pi/3 and a repetition rate of 100 Hz. Because of the multi-bunch operation, the structures have been designed with a very effective dipole HOM damping system to avoid beam break-up (BBU). They are quasi-constant gradient...

13. An influence of plasma on the wakefield amplitude excited in a dielectric structure by bunch train

Dr Gennadiy Sotnikov (NSC Kharkov Institute of Physics and Technology)

15/09/2015, 15:00

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

An influence of plasma on wakefield amplitude excited in dielectric structure by a sequence of relativistic electron bunches is investigated. The considered structure is a dielectric waveguide of a cylindrical configuration with the axial drift channel filled with plasma. Dependences of amplitude of longitudinal electric field on plasma density for three cases are obtained: a) parameters of...

29. Real-time diagnostic for charging and damage of dielectrics

Dr Sergey Shchelkunov (Omega-P Inc)

15/09/2015, 15:25

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

The research will be presented that was aimed to address issues of analysis and mitigation of high repetition rate effects in Dielectric Wakefield Accelerators, and more specifically, to study charging rate and charge distribution in a thin walled dielectric wakefield accelerator from a passing charge bunch and the physics of conductivity and discharge phenomena in dielectric. The issue is...

210. Advanced Acceleration and THz Generation by Dielectric Based Structures: ANL/AWA/Euclid Techlabs Collaboration Activities

Dr Alexei Kanareykin (Euclid Techlabs LLC/ANL)

15/09/2015, 15:50

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Relativistic, high intensity and small emittance electron bunches are the basis of linear collider and FEL projects. Using Cherenkov radiation generated by a high current bunch passing a dielectric wake-field accelerator may provide a significant cost saving and reduction of the linear collider or FEL facility size. Femto-pico-second electron bunches are used for high power THz generation for...

124. The dynamics of metal surfaces under high fields

Walter Wuensch (CERN)

15/09/2015, 16:10

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

The CLIC study has successfully developed X-band accelerating structure prototypes that reliably operate at an accelerating gradient above 100 MV/m. An important contribution to the development has been a study of the dynamics of metal surfaces under high electromagnetic fields. This multidisciplinary study has resulted in a number of important insights into the fundamental limitations of...

150. Recent Experiments at the Argonne Wakefield Accelerator Facility (AWA)

Manoel Conde (Argonne National Laboratory)

15/09/2015, 16:30

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

The Argonne Wakefield Accelerator Facility develops technology for future HEP accelerators. Its main focus is on the use of electron beam driven wakefield acceleration using RF structures. A high intensity electron linac is used to drive wakefields, and a second electron linac provides electron bunches to be accelerated by these wakefields. Recent two-beam-acceleration (TBA) experiments have...

172. AREAL Test Facility for Advanced Accelerator and Radiation Sources Concepts

Prof. Vasili Tsakanov (CANDLE Synchrotron Research Institute)

15/09/2015, 16:50

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

Advanced Research Electron Accelerator Laboratory (AREAL) is a 20 MeV electron linear accelerator with laser driven RF gun being constructed in the CANDLE institute. Along with applications in life and material sciences, it aims to serve as a test facility for experimental study in the fields of novel accelerator technology and radiation sources. The construction of the 5 MeV RF photogun...

246. Electron acceleration at a dielectric structure: updates from the lab

Prof. Peter Hommelhoff (University of Erlangen and Max Planck Institute for Quantum Optics)

15/09/2015, 17:10

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

After the initial proof-of-concept experiments by the Stanford/SLAC and Erlangen/MPQ groups in 2013 demonstrating dielectric laser acceleration (DLA) at silica structures, we here give an overview over recently achieved results from the lab. They include acceleration at higher spatial harmonics, which will allow for smaller initial electron injection energy down into the single-digit keV...

65. VELA/CLARA at Daresbury Laboratory as a test-bed for advanced accelerator concepts

Dr Yuri Saveliev (STFC, Daresbury Lab., ASTeC)

15/09/2015, 18:00

WG3 - Electron beams from electromagnetic structures, including dielectric and laser-driven structures

talk

VELA (Versatile Electron Linear Accelerator) is a new small scale facility at Daresbury Laboratory, UK. It is based on RF photoelectron gun and currently delivers high quality short electron bunches with the beam energy of ~5MeV. The facility has two dedicated experimental areas. One of them is specifically designed to accommodate various experimental arrangements including studies and testing...