ACHIP+ workshop

18 Mar 2024, 01:00 → 19 Mar 2024, 18:30 Europe/Berlin

FLASH Seminar room (DESY)

Welcome to the first ACHIP+ workshop at Deutsches Elektronen-Synchrotron DESY in Hamburg, Germany on March 18^th and 19^th 2024. This workshop is in continuation of the Accelerator on a Chip International Program (ACHIP) which was funded by Gordon and Betty Moore Foundation (www.achip.stanford.edu). 

We aim to continue and expand the international collaboration in research on laser-illuminated dielectric micro-structures as charged particle accelerators, diagnostic devices and photon sources.

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Monday 18 March

08:00 coffee

DLA - Theory and Design

Convener: Willi Kuropka (MPY1 (MPY Fachgruppe 1))

1 Welcome

2 DLA-PINEM physics and efficient acceleration

PINEM, the exchange of photons with a given electron, could be regarded as the fundamental effect governing DLA in the quantum regime. Understanding PINEM physics is an excellent approach to thinking about more efficient DLA structures. I will discuss the link between PINEM and DLA in detail, towards higher-gradient acceleration

Speaker: Roy Shiloh (FAU Erlangen-Nuremberg)

Roy Shiloh DLA-PINEM_indico.pdf

3 ML-based control and optimization of DLA experiments

The experimental complexity of DLA experiments increases with increasing structure length and the utilization of more complex laser pulse shapes, such as pulse front tilts. Consequently, the experiments involve many parameters demanding careful control and optimization. Previous studies have demonstrated the efficacy of machine learning (ML) in enhancing the performance of conventional accelerators. In this presentation, I will introduce our research project funded by the BMBF, which aims to implement a machine learning-based control system. This system is designed to reconstruct, analyze and optimize the laser pulse shape used for DLA experiments at ARES, leveraging electron beam diagnostics after the DLA interaction.

Speaker: Thilo Egenolf (TEMF, TU Darmstadt)

meeting_achip_egenolf.pdf

10:30 coffee break

DLA - Experiments

Convener: Dr Frank Mayet (MPY1 (MPY Fachgruppe 1))

4 Sub-relativistic Alternating Phase Focusing Dielectric Laser Accelerators

We present our results for the design, fabrication, and testing of silicon-based, sub-relativistic Dielectric Laser Accelerators (DLAs) which use optical near fields to accelerate and confine electrons over extended distances. We describe how Alternating Phase Focusing (APF) lattices are incorporated to longitudinally/transversely focus/defocus electrons in an alternating fashion based on electron-laser interaction phase. Alternating between ±60° off-crest synchronous phases enables us to operate at half the peak acceleration gradient while also imparting strong confinement forces, ultimately extending interaction lengths up to 708 μm and achieving energy gains up to 23.7 ± 1.07 keV FWHM. We also highlight future directions for three-dimensional confinement, bunching, and quantum behavior of electrons in DLAs.

Speaker: Melanie Murillo (Stanford University)

Hamburg Invited Talk - Subrelativistic Alternating Phase Focusing Dielectric Laser Accelerators v2.pptx

5 Dielectric Laser Acceleration - state of the art and recent sub-relativistic experiments

Speaker: Stefanie Kraus (Chair for Laserphysics FAU Erlangen)

ACHIP__Kraus_2023_upload.pptx

6 Dielectric Laser Acceleration with Relativistic Beams - Recent Results at ARES

In this talk the DLA-related experiments at the SINBAD/ARES linear accelerator at DESY are presented. Both recent results, as well as future plans are discussed.

Speaker: Dr Frank Mayet (MPY1 (MPY Fachgruppe 1))

ACHIP+_2024_Day1_FM.pdf

7 Extended Interaction Length Laser-Driven Acceleration in a Tunable Dielectric Structure

The development of long, tunable structures is critical to increasing energy gain in laser-driven dielectric accelerators (DLAs). Here we combine pulse-front-tilt illumination with slab-geometry structures assembled by precisely aligning off-the-shelf 4~mm long transmission gratings to achieve up to 200 keV energy modulation for 6 MeV injected electrons. The effective interaction length is longer than 1~mm, limited by dephasing of the accelerated particles in the structure. The piezo-based independent mounting system for the gratings allows tuning of the gap and field distribution inside the structure.

Speaker: Sophie Crisp (UCLA)

ACHIP2024_00.pptx

13:00 lunch break

Synergistic Optical Approaches - Acceleration

Convener: Stefanie Kraus (Chair for Laserphysics FAU Erlangen)

8 Title TBD

Speaker: Huaixin Yang (Chinese Academy of Sciences)

9 Terahertz Acceleration

Speaker: Franz Kaertner (FS-CFEL-2 (Ultrafast X-rays Group))

2024-03-18-ACHIP.pdf

10 Acceleration, compression and timing stabilisation of relativistic beams with THz pulses

Speaker: Steven Jamison (Lancaster Univ)

11 Lossless electron monochromator in an ultrafast TEM using near-field THz radiation

Speakers: Ido Kaminer (Technion), Yuval Adiv

Lossless monochromator and SPR through EELS for ACHIP+ March 18th.pdf

16:00 coffee break

16:30 Discussion Session

18:30 Workshop Dinner - Elbspeicher Hamburg

Tuesday 19 March

08:00 coffee

Synergistic Optical Approaches - Lasers

Convener: Pietro Musumeci (UCLA)

12 Key issues in the development of inverse-Cherenkov dielectric laser accelerators

Speaker: Weihao Liu (Chinese Academy of Sciences)

13 Laser-based electron beam shaping: from facilities to the nanoscale

Speaker: Sergio Carbajo (SLAC National Accelerator Laboratory)

ACHIP_Carbajo.pptx

14 Optical design of waveguides and adapters for extended dielectric accelerating structures

Speaker: Giuseppe Torrisi (INFN Catania)

Achip_Torrisi_19_03.pptx

10:00 coffee break

Radiation, Smith Purcell, THz

Convener: Joel England (SLAC)

15 The European EIC TWAC Project on Terahertz Dielectric Acceleration - Christelle Bruni, Eleonore Roussel

Speakers: Christelle Bruni (Lille University), Eleonore Roussel (Lille University)

EIC_TWAC_Workshop_ACHIP.pdf

16 Free electron-driven nanomaterials for versatile X-ray generation and quantum science

Speaker: Wong Liang Jie (NTU Singapore)

Hamburg_March2024_LJW_updated.pdf

17 Opportunities of ACHIP nano-bunches for high-brightness radiation and high-resolution inspection

Speaker: Yen-Chieh Huang (National Tsinghua University)

radiation from nano-bunches_YCHuang.pdf

18 Nanophotonic Travelling Wave Tube

In the first part of the talk I will briefly review the literature on Smith–Purcell Free Electron Lasers, and speculate about the possibility of scaling down a radio wave amplifier: coupled-cavity Travelling Wave Tube, to obtain a light-generating device based on nanostructures. In the second part of the talk I will show concrete numerical results on Cherenkov Diffraction Radiation: the Fabry–Perot effect for the evanescent wave, and the anti-reflection layer for the evanescent wave.

Speaker: Andrzej Szczepkowicz (University of Wroclaw)

Andrzej-Szczepkowicz-ACHIPplus.pdf

12:30 lunch break

Applications

Convener: Hueseyin Cankaya (FS-LA (FLASH 2020+ flexible pump probe lasers))

19 Electron-Atom scattering with attosecond bunched pulses

Speaker: Yuya Morimoto (Friedrich-Alexander-Universität Erlangen-Nürnberg)

20 Quantum DLA

Speaker: Zhexin Zhao (Stanford University)

20240317_DLA_achip_16-9_v2.pptx

21 REGAE: Ultrafast electron diffraction

Speaker: Alke Meents (FS-CFEL-1-BMX (FS-CFEL-1 Fachgruppe BMX))

22 DLA for Dark Matter Search

Speaker: Raziyeh Dadashi Motlagh

DLA for DM studies_ASHIP+_.key

DLA for DM studies_ASHIP+_.pdf

16:00 coffee break

16:30 Discussion Session

17:30 ARES tour