379 citations · 487 across the 11 of their papers we have counts for
11 papers
Combining Particle Tracking with Electromagnetic Radiation Showers: Merging GPT and Geant4 with Visualization
David H. Dowell, Munther Hindi, S. B. van der Geer +1
Field emitted electrons can seriously affect the operation of high-field, high-duty factor electron accelerators. Accelerated field emission can result in high average power beams…
Topological Cathodes: Controlling the Space Charge Limit of Electron Emission Using Metamaterials
David H. Dowell
The space charge limit (SCL) of emission from photocathodes sets an upper limit on the performance of both high- and low-field electron guns. Generally, one is forced to strike a c…
Correcting Emittance Growth Due to Stray Sextupole Fields
David H. Dowell
This paper discusses the emittance growth produced by sextupole fields in conjunction with a solenoidal focusing. The sextupole emittance is derived and compared with numerical sim…
Nano-machining, surface analysis and emittance measurements of a copper photocathode at SPARC_LAB
J. Scifo, D. Alesini, M. P. Anania +25
R\&D activity on Cu photocathodes is under development at the SPARC\_LAB test facility to fully characterize each stage of the photocathode "life" and to have a complete overview o…
Exact Cancellation of Emittance Due to Coupled Transverse Dynamics in Solenoids and RF Couplers
David H. Dowell, Feng Zhou, John Schmerge
Small, stray magnetic and RF fields in electron guns and injectors can perturb an electron beam and introduce correlations between the otherwise orthogonal transverse trajectories.…
Sources of Emittance in RF Photocathode Injectors: Intrinsic emittance, space charge forces due to non-uniformities, RF and solenoid effects
David H. Dowell
Advances in electron beam technology have been central to creating the current generation of x-ray free electron lasers and ultra-fast electron microscopes. These once exotic devic…