20th Advanced Accelerator Concepts Workshop

Nov 6, 2022, 3:00 PM → Nov 11, 2022, 5:10 PM America/New_York

Hyatt Regency Long Island

Mark Palmer (Brookhaven National Laboratory), Navid Vafaei-Najafabadi (Stony Brook University)

The AAC’22 workshop is the 20th in a series of by-invitation biennial fora for intensive discussions on long-term research in advanced accelerator physics and technology. This research supports the development of capabilities for the basic sciences, from photon science to high energy physics, as well as the development of compact accelerators for industrial, medical and security applications.

AAC'22 will be organized into eight working groups covering the following topical areas:

1. Laser-Plasma Wakefield Acceleration 
2. Computation for Accelerator Physics
3. Laser and High-Gradient Structure-Based Acceleration
4. Beam-Driven Acceleration
5. Beam Sources, Monitoring, and Control
6. Laser-Plasma Acceleration of Ions
7. Radiation Generation and Advanced Concepts
8. Advanced Laser and Beam Technology and Facilities

Conference Home:  https://www.aac2022.org/

 

Sunday, November 6

6:00 PM → 7:30 PM Welcome Reception

Monday, November 7

10:20 AM → 10:40 AM Coffee Break

12:10 PM → 1:30 PM Lunch

3:00 PM → 3:30 PM Coffee Break

Tuesday, November 8

10:00 AM → 10:30 AM Coffee Break

12:00 PM → 1:20 PM Lunch

1:30 PM → 3:00 PM WGs 3+5 Joint Session: Session 1 of 1: Injectors

Joint session between working groups 3 & 5:
WG3 - Laser and High-Gradient Structure-Based Acceleration
WG5 - Beam Sources, Monitoring and Control

Conveners: Dr Samuel Barber (Lawrence Berkeley National Laboratory), Sergey Belomestnykh (Fermilab), Xueying Lu (NIU / ANL), Yine Sun (Argonne National Laboratory)

1:30 PM Development of High Brightness Photoinjector for AWA

High brightness beams for XFELs and UEM essentially imply a high current and a low emittance. To obtain such beams we propose to raise the accelerating voltage in the gun mitigating repealing Coulomb forces. An ultra-high gradient is achieved utilizing a short-pulse technology. A successful experiment with an X-band photoinjector has been recently carried out at Argonne Wakefield Accelerator (AWA) facility. The carried-out test showed that the 1,5-cell gun was able to inject up to 6 MeV,100 pC electron bunches at room temperature being fed by 9 ns up to 300 MW pulses. As high as 400 MV/m cathode field was obtained. The gun had ~10-6 breakdown rate and showed low average dark current. We have been analysing emittance measurements and planning to develop a new gun. This plan includes an idea to fabricate the gun consisted of larger number of cells to increase the energy gain. One of possible solutions is a so-called open structure gun. It was shown that this multi-cell gun can provide excellent field balance and mode selection, easy access of laser to the cathode, easy fine tuning, and efficient pumping. The gun can be based on brazeless technology and can have the removable cathode. Additional appealing opportunity to increase the gradient substantially is to operate the gun at cryogenic temperatures.

Speaker: Sergey Kuzikov (Euclid Techlabs, LLC)

Development of Photoinjector for AWA

Photoijector Development.pptx

1:50 PM Report on experimental results of a sub-GV/m photocathode gun

A program to develop a sub-GV/m rf photocathode gun is underway at Argonne Wakefield Accelerator (AWA) facility as a pathway towards producing brighter electron bunches. The X-band rf gun is powered by high-power, short rf pulses (9-ns FWHM), which, in turn, are generated by AWA’s high-current drive beam. In a previous proof-of-principle experiment, an unprecedented gradient of 400 MV/m on the photocathode surface was demonstrated. In this talk, we present recent progress and our R&D roadmap for the next several years.

Speaker: Gongxiaohui Chen (Argonne National Laboratory)

GChen_AAC.pdf

2:10 PM Sub-fs beam generation at the UCLA Pegasus Laboratory

We present the design of an experiment aiming at the generation of a moderate energy (4 MeV) single sub-fs electron beam from an RF photoinjector for application in UED and injection in advanced accelerators. The design is based on an envelope equation-based approach to obtain analytical scaling laws for the shortest pulse length achievable using radiofrequency (RF) based bunch compression. The derived formulas elucidate the dependencies on the electron beam energy and beam charge and reveal how relativistic energies are strongly desirable to obtain bunches containing 1 million electrons with single-digit fs pulse lengths. An additional higher frequency RF cavity is implemented, which linearizes the bunch compression, enabling the generation of ultrashort beams in the sub-femtosecond regime. A range of options to measure the sub-fs bunch length will be discussed.

Speaker: Pietro Musumeci

subfs_wg5_AAC22.pdf

subfs_wg5_AAC22.pptx

3:00 PM → 3:30 PM Coffee Break/Exhibits

Wednesday, November 9

10:00 AM → 10:30 AM Coffee Break/Exhibits

12:00 PM → 1:20 PM Lunch

Thursday, November 10

10:00 AM → 10:30 AM Coffee Break/Exhibits

12:00 PM → 1:20 PM Lunch

3:00 PM → 6:00 PM Afternoon at Leisure

Friday, November 11

10:00 AM → 10:30 AM Coffee Break

12:00 PM → 1:00 PM Lunch

2:40 PM → 3:00 PM Coffee Break