Maximum achievable beam brightness from photoinjectors.

  title={Maximum achievable beam brightness from photoinjectors.},
  author={Ivan V. Bazarov and Bruce M. Dunham and C. K. Sinclair},
  journal={Physical review letters},
  volume={102 10},
Electron injectors delivering relativistic electron beams with very high brightness are essential for a number of current and proposed electron accelerator applications. These high brightness beams are generally produced from photoemission cathodes. We formulate a limit on the electron beam brightness from such cathodes set by the transverse thermal energy of the electrons leaving the photocathode and the accelerating field at the cathode. Two specific examples--direct measurement of the… 

Figures from this paper

A cryogenically cooled high voltage DC photoemission electron source.

A new design for a compact high voltage DC electron gun with a novel cryogenic photocathode system is presented and the possibility of generating and characterizing electron beam from photocathodes developed at other institutions is opened.

Recent Developments of Low-emittance Electron Gun for Accelerator

Recent developments of low-emittance electron guns for accelerator are reviewed. In the accelerator field, DC biased triode thermionic gun (Pierce type gun) has been widely used and is still

Comparison of dc and superconducting rf photoemission guns for high brightness high average current beam production

A comparison of the two most prominent electron sources of high average current high brightness electron beams, DC and super- conducting RF photoemission guns, is carried out using a large-scale

Demonstration of Cathode Emittance Dominated High Bunch Charge Beams in a DC gun-based Photoinjector

We present the results of transverse emittance and longitudinal current profile measurements of high bunch charge (≥100 pC) beams produced in the DC gun-based Cornell energy recovery linac

Monte Carlo charge transport and photoemission from negative electron affinity GaAs photocathodes

High quantum yield, low transverse energy spread, and prompt response time make GaAs activated to negative electron affinity an ideal candidate for a photocathode in high brightness photoinjectors.

Design considerations for a high voltage DC photoemission electron gun at Cornell University

At Cornell University, we have designed and built a DC photoemission electron gun that is capable of operating above 500 kV and up to 100 mA average current. Such a gun is the best choice as a high

Child-Langmuir law for photoinjectors

The space-charge field at the cathode limits the current density extracted from particle sources such as photoinjectors. For a long time, the maximum current has been estimated by using the classical

Ultracold Electrons via Near-Threshold Photoemission from Single-Crystal Cu(100).

This Letter demonstrates a record low mean transverse energy of 5 meV from the cryo-cooled surface of copper using near-threshold photoemission and shows that the electron energy spread obtained from such a surface is less than 11.5 MeV, making it the smallest energy spread electron source known to date.



Theory and Design of Charged Particle Beams

Review of Charged Particle Dynamics. Beam Optics and Focusing Systems Without Space Charge. Linear Beam Optics with Space Charge. Self-Consistent Theory of Beams. Emittance Variation. Beam Physics


  • Fluids B 4, 1674
  • 1992

Phys. Plasmas

  • Phys. Plasmas
  • 1997

Nucl. Instrum. Methods Phys. Res., Sect. A

  • Nucl. Instrum. Methods Phys. Res., Sect. A
  • 1989


  • Instrum. Methods Phys. Res., Sect. A 285, 313
  • 1989

Adv. Electron. Electron Phys. Suppl

  • Adv. Electron. Electron Phys. Suppl
  • 1980

Phys. Plasmas

  • Phys. Plasmas
  • 2002


  • 413, 321
  • 1997

Phys. Fluids B

  • Phys. Fluids B
  • 1992

Proc. 413

  • Proc. 413
  • 1997