Magnetized Electron Gun for MEIC Cooler

This project aims to generate magnetized electron beams from a DC high voltage photogun. Simulations and corresponding measurements of beam magnetization as a function of laser pulse dimension and magnetic field strength at the photocathode are planned. Round-to-flat beam transformation will be performed using three skew quadrupoles and the transverse emittance ratios will be measured. Photocathode lifetime at milli-ampere currents will be compared to beam lifetimes with no magnetization, to study the effect of the solenoid field on photocathode ion-back bombardment. Afterwards, a follow-up proposal can be submitted to evaluate the merits of magnetized beam generation using a DC high voltage thermionic gun, with rf-pulsed gridded thermionic emitter. Combined, these simulations and measurements will benchmark our design tools and provide insights on ways to optimize the MEIC electron cooler, and help us choose the appropriate electron source and injector layout.

• Magnetized Beam LDRD

• Magnetized Gun References and Documents

• Magnetized Gun Planning Meetings

• root macros:
  • root macro to calculate magnetized beam parameters (Gaussian beam): (change .txt to .C): media:magbeam.txt
  • root macro to calculate magnetized (drift) emittance for Gaussian vs Top-hat beam: (change .txt to .C): media:DriftEmit.txt
  • root macro to generate magnetized electrons (Gaussian beam): (change .C.txt to .C) media:magbeam_Gaussian_xy.C.txt media:magbeam_Gaussian_xy.gif media:MagBeam_Gaussian_xy.txt
  • root macro to generate magnetized electrons (Flat-Top beam): (change .C.txt to .C) media:magbeam_FlatTop_xy.C.txt media:magbeam_FlatTop_xy.gif media:MagBeam_FlatTop_xy.txt

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• Electron Guns Overview

• Electron Cooling

• JLEIC Collaboration Meeting Spring 2016 [1]

• MEIC Collaboration Meeting Fall 2015 [2]

• COOL15 Workshop at JLab [3]

• MEIC Collaboration Meeting Spring 2015 [4]

• January 2015 MEIC Summary Document [5] media:MEIC_Summary_Document_1-2015.pdf

• EIC14 at JLab, March 17-21, 2014 [6]
  • Operation of Jefferson Lab Polarized Electron Sources at High Currents: media:WEYAUD2_talk.pdf media:WEYAUD2_talk.ppt
  • Proceedings: media:WEYAUD2.pdf media:WEYAUD2.docx

In-Situ Magnetic Field by Polar Kerr Effect

• Magneto-optical Kerr Effect

Polarized Electron Source

• MEIC Polarized Electron Source: media:MEIC_Polarized_Electron_source.pdf media:MEIC_Polarized_Electron_source.pptx

• Polarized Electron Source Comparison: media:EIC_Source_Parameter_Comparison.pdf media:EIC_Source_Parameter_Comparison.pptx

JLab Photo-electron Guns Performance

media:JLabPhotoelectronGunPerformance.pdf

media:JLabPhotoelectronGunPerformance.pptx