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Title: Photocathode Laser Shaping for High Transformer Ratio Collinear Wakefield Acceleration

Abstract

Beam-driven wakefield acceleration is one of the most promising advanced accelerator concepts. With this approach, the main beam is accelerated by absorbing the energy from a drive beam, which has a lower kinetic energy, but a much higher current. For efficient acceleration, it is important to shape the drive beam axially, to increase the so-called transformer ratio: the energy gain by the main beam over the energy loss of the drive beam. In most cases, the drive beam shaping is done with the help of beam phase space manipulations, along with removing portions of the beam with a scraper. Such shaping is complicated by itself, causing charge loss and thermal heating, but can also lead to beam instabilities, due to the alteration of the beam phase space. How the problem is being addressed: In this project, Euclid Techlabs proposes to reduce the complexity of this process by shaping the laser beam incident on the photocathode instead of the electron beam itself. This approach yields an additional “tuning knob” for shaping the electron beam. The photocathode laser pulse can be modified to have the desired longitudinal profile, which will result in the desired profile of the electron beam after acceleration inmore » the photoinjector. Laser shaping is, in fact, analogous to previous electron beam shaping approaches. A chirped beam is passed through a dispersive element (spatial light modulator), and masked to achieve the desired shape.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Euclid Techlabs LLC., Cleveland, OH (United States)
Publication Date:
Research Org.:
Euclid Techlabs, LLC, Solon, OH (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
NIU, FNAL - ANL/HEP/AWA
OSTI Identifier:
1469367
Report Number(s):
DOE-Euclid Techlabs-PH1-17750
17750
DOE Contract Number:  
SC0017750
Type / Phase:
SBIR (Phase I)
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; electron accelerator; laser; photoinjector; shaping; wakefield

Citation Formats

Kanareykin, Alex, Jing, Chunguang, Kostin, Roman, and Liu, Ao. Photocathode Laser Shaping for High Transformer Ratio Collinear Wakefield Acceleration. United States: N. p., 2018. Web.
Kanareykin, Alex, Jing, Chunguang, Kostin, Roman, & Liu, Ao. Photocathode Laser Shaping for High Transformer Ratio Collinear Wakefield Acceleration. United States.
Kanareykin, Alex, Jing, Chunguang, Kostin, Roman, and Liu, Ao. Sun . "Photocathode Laser Shaping for High Transformer Ratio Collinear Wakefield Acceleration". United States.
@article{osti_1469367,
title = {Photocathode Laser Shaping for High Transformer Ratio Collinear Wakefield Acceleration},
author = {Kanareykin, Alex and Jing, Chunguang and Kostin, Roman and Liu, Ao},
abstractNote = {Beam-driven wakefield acceleration is one of the most promising advanced accelerator concepts. With this approach, the main beam is accelerated by absorbing the energy from a drive beam, which has a lower kinetic energy, but a much higher current. For efficient acceleration, it is important to shape the drive beam axially, to increase the so-called transformer ratio: the energy gain by the main beam over the energy loss of the drive beam. In most cases, the drive beam shaping is done with the help of beam phase space manipulations, along with removing portions of the beam with a scraper. Such shaping is complicated by itself, causing charge loss and thermal heating, but can also lead to beam instabilities, due to the alteration of the beam phase space. How the problem is being addressed: In this project, Euclid Techlabs proposes to reduce the complexity of this process by shaping the laser beam incident on the photocathode instead of the electron beam itself. This approach yields an additional “tuning knob” for shaping the electron beam. The photocathode laser pulse can be modified to have the desired longitudinal profile, which will result in the desired profile of the electron beam after acceleration in the photoinjector. Laser shaping is, in fact, analogous to previous electron beam shaping approaches. A chirped beam is passed through a dispersive element (spatial light modulator), and masked to achieve the desired shape.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {3}
}

Technical Report:
This technical report may be released as soon as September 11, 2022
Other availability
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