20th Advanced Accelerator Concepts Workshop

Session

WG3: Laser and High-Gradient Structure-Based Acceleration

WG3

Nov 7, 2022, 1:30 PM

Gardiner's Island

Conveners

WG3: Laser and High-Gradient Structure-Based Acceleration: Session 1: Join WG4 for SWFA talks

• Xueying Lu (NIU / ANL)
• Sergey Belomestnykh (Fermilab)

WG3: Laser and High-Gradient Structure-Based Acceleration: Session 2: Structures I

• Sergey Belomestnykh (Fermilab)
• Xueying Lu (NIU / ANL)

WG3: Laser and High-Gradient Structure-Based Acceleration: Session 4: Structures II

• Sergey Belomestnykh (Fermilab)
• Xueying Lu (NIU / ANL)

WG3: Laser and High-Gradient Structure-Based Acceleration: Session 5: Laser / THz

• Sergey Belomestnykh (Fermilab)
• Xueying Lu (NIU / ANL)

WG3: Laser and High-Gradient Structure-Based Acceleration: Session 6

• Xueying Lu (NIU / ANL)
• Sergey Belomestnykh (Fermilab)

WG3: Laser and High-Gradient Structure-Based Acceleration: Session 7: Proton / Other

• Sergey Belomestnykh (Fermilab)
• Xueying Lu (NIU / ANL)

WG3: Laser and High-Gradient Structure-Based Acceleration: Session 8: Preparation of WG3 Summary Presentation

• Sergey Belomestnykh (Fermilab)
• Xueying Lu (NIU / ANL)

124. High Power Test Results of X-Band Dielectric Disk Accelerating Structures

Ben Freemire (Euclid Beamlabs)

11/7/22, 3:30 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

As part of the Argonne 500 MeV short pulse Two Beam Wakefield Acceleration Demonstrator, several single cell X-band dielectric disk loaded accelerators (DDA) have been designed, fabricated, and tested at high power at the Argonne Wakefield Accelerator. The DDA should provide a short pulse (~20 ns) high gradient (>100 MV/m) accelerator while maintaining a reasonable r/Q and high group...

63. Simulation Results of a Clamped Multicell Dielectric Disk Accelerating Structure

Sarah Weatherly (Illinois Institute of Technology, Argonne National Laboratory)

11/7/22, 4:00 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

A method of decreasing the required footprint of linear electron accelerators and to improve their energy efficiency is utilizing short RF pulses (~9 ns) with Dielectric Disk Accelerators (DDA). A DDA is an accelerating structure that utilizes dielectric disks in its design to improve the shunt impedance. Two DDA structures have been designed and tested at the Argonne Wakefield Accelerator. ...

30. Cryogenic Dielectric Accelerating Structures

Chunguang Jing

11/7/22, 4:30 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

Shunt impedance is one of the most important parameters characterizing particle acceleration efficiency. It is known that RF losses are reduced at cryogenic temperatures. For example, a record high shunt impedance of 350 MΩ/m was demonstrated recently for all metal X-band accelerating structure, which is more than 2 times higher than that at room temperature. Here we present a novel hybrid...

31. Evaluation of DLC (diamond-like carbon) Coating on Multipactor Suppression

Chunguang Jing

11/8/22, 3:30 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

Multipactor discharges in dielectric accelerating structures are a major limitation on the performance of this otherwise very promising technology for future high energy physics machines and other applications. Multipactor occurs when the Secondary Emission Yield (SEY) of the dielectric material used in accelerating structures is significantly higher than 1. In this work, we evaluated the...

102. Short Pulse High Gradient Accelerating Structures

Sergey Kuzikov (Euclid Techlabs, LLC)

11/8/22, 4:00 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

RF breakdown and pulse heating are the greatest obstacles to increasing the accelerating gradient. Numerous experiments have shown that the RF breakdown and pulse heating thresholds depend on the exposure time of the structure to the RF fields. The idea described here is to accelerate particles by short (nanosecond or subnanosecond) duration wakefields in a structure assembled of individually...

210. Modulation of dense electron beams in nanostructures: A simulation study in preparation of the FACET-II E-336 experiment

Alexander Knetsch

11/8/22, 4:30 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

Fields arising during the propagation of highly intense electron beams in structured targets of nanometer scale such as carbon-nanotubes can contain accelerating gradients of up to 10 TV/m with similarly strong focusing fields. Studies of beam-nanotarget interaction are therefore of interest as they may lead to an acceleration method with extremely high single-stage energy gains for electron...

95. THz generation fro 3-D printed structures in accelerators

Pavle Juranic (Paul Scherrer Institut)

11/9/22, 1:30 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

The presentation will discuss advancements and new concepts on the topic of THz generation by 3-d printed structures in relativistic electron beams. A new concept has been developed that would greatly increase the efficiency of THz light generation, as well as allow for greater possibilities for control of the properties of the so generated Thz light. Wavelength, collimation and possibly pulse...

187. ACHIP experiments at the ARES linac

Willi Kuropka (Deutsches Elektronen-Synchrotron DESY)

11/9/22, 2:00 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

ARES is a linear particle accelerator at Deutsches Elektronen-Synchrotron DESY capable of producing high-quality, low-emittance electron beams dedicated to accelerator research and development. As an introduction we will present the achieved and projected performance of the ARES linac. An overview of the research activities on ultra-short electron bunch diagnostic methods, electron imaging and...

253. Energy Modulation in a Commercial Dual Grating Dielectric Structure

Sophie Crisp (UCLA)

11/9/22, 2:30 PM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

We present the latest experimental results using a dual grating dielectric laser accelerator (DLA) to modulate 6 MeV electrons. The structure is composed of two commercially available gratings, mounted independently with variable gap size controlled by 3 piezo motors. A 780 nm laser is used to drive the 800 nm periodic structure with gap size on the order of 1 um. These gratings are 4 mm long,...

99. Update on the status of the C-band high gradient program at LANL

Evgenya Simakov (LANL)

11/10/22, 8:30 AM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

This talk will report on the status C-band high gradient research program at Los Alamos National Laboratory (LANL). The program is being built around two test facilities: C-band Engineering Research Facility in New Mexico (CERF-NM), and Cathodes And Radio-frequency Interactions in Extremes (CARIE). Modern applications such as X-ray sources require accelerators with optimized cost of...

74. New, High Efficiency RF Sources

R Lawrence Ives (Calabazas Creek Research, Inc.)

11/10/22, 9:00 AM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

Several new, high efficiency, RF sources are available or in development at frequencies from 325 MHz to 1.3 GHz and higher. If successfully developed, these new devices will represent lower cost alternatives to conventional RF sources. The primary focus is RF power production at higher efficiency and lower cost than currently available from conventional vacuum electron devices and solid-state...

224. RF Cavity Needs for Future Muon Accelerators

Ben Freemire (Euclid Beamlabs)

11/10/22, 9:30 AM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

The future of high energy colliders beyond the high luminosity upgrade to the LHC is presently unclear. Physics and economics arguments are being made for hadrons vs. leptons and circular vs. linear machines. A muon collider is now being considered in Europe as a potential Future Circular Collider at CERN. Among the technological challenges inherent to a muon accelerator are beam cooling...

25. High-Gradient 3 GeV Booster for Enhanced Proton Radiography at LANSCE

Yuri Batygin (Los Alamos National Laboratory)

11/10/22, 10:30 AM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

Increasing the proton beam energy from the present 800 MeV to 3 GeV will improve the resolution of the Proton Radiography Facility at the Los Alamos Neutron Science Center (LANSCE) by a factor of 10. It will bridge the gap between the existing facilities, which covers large length scales for thick objects, and future high-brightness light sources, which can provide the finest resolution....

29. High-Gradient Accelerating Structures for 3-GeV Proton Radiography Booster

Sergey Kurennoy (Los Alamos National Laboratory)

11/10/22, 11:00 AM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

Increasing energy of proton beam at the Los Alamos Neutron Science Center (LANSCE) from 800 MeV to 3 GeV will improve radiography resolution ~10 times. This energy boost can be achieved with a compact cost-effective linac based on normal conducting high-gradient (HG) RF accelerating structures. Such an unusual proton booster is feasible for proton radiography (pRad), which operates with short...

48. Plasmonic Wakes in a Semi-conductor

Tom Katsouleas (U of Ct)

11/10/22, 11:30 AM

WG3 Oral: Laser and High-Gradient Structure-Based Acceleration

Contributed Oral

The possibility of exciting wakefields in a semi-conducting structure is discussed. The fundamental limitation of short mean free paths of electrons in the semi-conductor can be overcome above a threshold beam or laser driver intensity when the electrons are driven to sufficient velocities that their Coulomb collision cross-section drops precipitously. The wakes differ from those in either a...