Advanced Accelerator Concepts 2026

Session

A4-Working group # 4

27 Jul 2026, 16:00

Luskin Conference Center, UCLA

15. Copper Coated Peek Based RF Cavity Power and Q Factor Testing

Benjamin Sims (LANL)

27/07/2026, 16:00

To be considered for Working Group talk

Lightweight, copper plated PEEK RF cavities offer a path to compact, low cost accelerators. We describe the design and fabrication of PEEK structures that are selectively metallized with high conductivity copper on RF surfaces, and outline a verification workflow used to qualify these cavities. Cavity quality factor (Q) is measured with a VNA using a critically coupled and a weakly coupled...

19. ASTERIX: Development of TIG-Welded Four-Quadrant X-Band RF Accelerating Structures at INFN.

Luigi Faillace (Italian National Institute for Nuclear Physics (INFN))

27/07/2026, 16:20

To be considered for Working Group talk

The ASTERIX project, funded by the Istituto Nazionale di Fisica Nucleare (INFN) under the National Scientific Committee CSN5 program, focuses on the development of advanced X-band (11–12 GHz) accelerating structures based on hard copper and innovative manufacturing techniques. The project aims at the first demonstration of a practical, meter-long travelling-wave RF linac structure capable of...

200. Radiative damping in dielectric structures

Brian Naranjo (UCLA Dept. of Physics and Astronomy)

27/07/2026, 16:40

To be considered for Working Group talk

For future implementation at UCLA's MITHRA linac, we present a study incorporating radiative damping in dielectric wakefield accelerator (DWA) structures. Of primary focus is manipulation of the HE11 hybrid mode, including mitigation of witness-beam break-up and production of orbital-angular momentum radiation. Design and use of a quadrupole array for strong focusing integrated into the DWA...

16. Towards Generation of Orbital Angular Momentum THz Radiation via Dielectric Wakefield Acceleration

JACKSON ROZELLS

27/07/2026, 17:00

To be considered for Working Group talk

Dielectric wakefield acceleration, driven by electron beams, generates high-power, narrowband terahertz radiation via the coherent Cherenkov emission. While conventional dielectric-lined waveguides have been studied extensively for fundamental mode excitation, recent theory suggests higher-order modes carrying orbital angular momentum (OAM) can be deliberately excited in modified structures....

28. Co-propagating dielectric laser accelerators for compact high-gradient particle acceleration

Giuseppe Torrisi (Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS))

27/07/2026, 17:20

To be considered for Working Group talk

Dielectric Laser Accelerators (DLAs) are a promising approach for compact particle acceleration based on infrared lasers interacting with nanostructured dielectric materials. Operating at optical frequencies, these structures can sustain accelerating gradients well beyond the limits of conventional radio-frequency accelerators while enabling a drastic reduction of accelerator dimensions....

35. High Power Test of Ultra-Short High Gradient Cavities via RF Pulse Compression

Ankur Dhar (SLAC National Accelerator Lab)

28/07/2026, 16:00

To be considered for Working Group talk

High brightness electron beams have a wide range of applications ranging from accelerator-based light sources to ultrafast electron diffraction and microscopy. Brighter beams can be generated by increasing the accelerating gradient on the cathode at the time of photoemission, making high gradient photoinjectors an important tool. One possible path to simultaneously achieve high gradient and...

36. CUPID Photo-Injector Design and Beam Dynamics

Wei Hou Tan (SLAC National Accelerator Laboratory)

28/07/2026, 16:20

To be considered for Working Group talk

High gradient radio frequency (rf) driven photoguns are photoemission electron sources that have important applications for accelerator-based instruments, such as light sources and electron microscopy. Numerous efforts have been made to push for even higher field gradient while suppressing rf breakdowns. We propose the Compressed Ultrashort Pulse Injector Demonstrator (CUPID), a 1.6 cell...

57. High Gradient Testing of a Two-Cell C-band Accelerator Cavity with NiCr Higher-Order Mode Absorbers

Evgenya Simakov

28/07/2026, 16:40

To be considered for Working Group talk

This presentation will report on the status high gradient testing of a two-cell accelerator cavity with distributed coupling and higher-order-mode (HOM) damping slots covered with nickel-chromium (NiCr) absorbing material. The cavity is designed with a specific purpose to demonstrate applicability of NiCr material for damping HOMs in a C-band distributed-coupling accelerating structure, such...

56. High gradient testing of the C-band 1.6 cell all-copper photoinjector

Evgenya Simakov

28/07/2026, 16:55

To be considered for Working Group talk

This presentation will report on the status of the high gradient testing of a 1.6-cell C-band RF photoinjector at Los Alamos National Laboratory (LANL). The construction of the Cathodes And Radio-frequency Interactions in Extremes (CARIE) C-band high gradient photoinjector test facility began in October of 2022. CARIE will house a high gradient copper RF photoinjector and other high gradient...

44. Experimental Investigation of RF Breakdown in a Short-Pulse X-band Cavity

Gaurab Rijal (Northern Illinois University)

28/07/2026, 17:10

To be considered for Working Group talk

RF breakdown remains one of the principal limitations to high-gradient operation in normal-conducting accelerating cavities. Although breakdown under conventional long-pulse operation has been extensively studied, its behavior in the nanosecond short-pulse regime remains comparatively unexplored. In this regime, reduced pulse duration is expected to influence the development of field emission,...

70. Breakdown analysis and wakefield simulation for the RF cavities in the muon collider ionization cooling channel

Dillon Merenich (Northern Illinois University)

28/07/2026, 17:30

To be considered for Working Group talk

Ionization cooling is critical for a muon collider aiming to achieve high-luminosity collisions. In the cooling channel, the reference lab-frame relativistic β is between 0.88 and 0.93, a regime in which space charge effects cannot be ignored. The beam waist also varies substantially along the cooling lattice, suggesting that space charge effects may change significantly throughout the...

38. A-STRA: a wakefield accelerator for high-repetition rate XFELs

Alexander Zholents (Argonne National Laboratory)

30/07/2026, 16:00

To be considered for Working Group talk

A compact collinear wakefield accelerator has been developed for an X-ray free-electron laser operating at X-ray pulse repetition rates in the tens of kilohertz. The maximum achievable accelerating gradient is evaluated, with its upper limit constrained by beam breakup instability. Key fabrication techniques for the accelerator’s principal components—including wakefield generation structures,...

104. Progress on a High-Gradient Booster Linac for Multi-GeV Proton Radiography at LANSCE

Haoran Xu (Los Alamos National Laboratory)

30/07/2026, 16:20

To be considered for Working Group talk

A high-gradient energy booster linear accelerator (linac) is under investigation to increase the proton beam energy from 800 MeV to 3-5 GeV for the Proton Radiography (pRad) facility at Los Alamos Neutron Science Center (LANSCE). The increased beam energy is expected to enhance the resolution of radiography by one order of magnitude. We are evaluating a compact and cost-effective architecture...

246. LWFA-fed Compton Source Based on Dual-Energy Accumulator Ring with Cryocooled Nb3Sn Twin-Axis Cavities

Andrei Seryi (ODU)

30/07/2026, 16:40

To be considered for Working Group talk

We present a concept for a compact soft X-ray Compton source targeting the water-window spectral range (2.3–4.4 nm, 280–540 eV), based on an unconventional combination of three advanced accelerator technologies: laser-wakefield acceleration (LWFA) for top-up injection, a dual-energy accumulator ring with energy recovery, and cryocooled Nb3Sn twin-axis superconducting RF cavities.

The source...

52. High-efficiency Traveling-Wave Accelerating Structure with Ceramic Insertion

Haoran Xu (Los Alamos National Laboratory)

To be considered for Working Group talk

For the first time, high shunt impedance at 162 MΩ/m and high group velocity at 3.1% of the speed of light are achieved simultaneously, in a normal-conducting radiofrequency (NCRF) accelerating structure at 5.7 GHz (C-band). We report our theoretical study on a novel type of traveling wave accelerating structure that operates with a 2π/3-mode. The high shunt impedance is realized by the...