AI Article Synopsis
- A new apparatus called the momentatron, which features a planar-cathode and grid-anode setup, allows for precise measurements of transverse momentum and emittance of electron beams produced by photocathodes.
- Researchers have systematically analyzed potential errors from the grid anode's design and alignment issues that could affect measurements during the electron beam fabrication process.
- Using both analytical methods and three-dimensional electrostatic field simulations, the study validates that the momentatron can accurately measure electron beam properties, with only minor errors influencing the results.
Article Abstract
A compact setup with a planar-cathode and grid-anode plus free field drift distance configuration (momentatron) has provided a new way to measure the transverse momentum and, hence, the emittance of the electron beam from a photocathode. This method has been used for analysis of the transverse momentum and emittance of the photoemitted electron beam from the photocathode in a stepwise manner during the fabrication process. The errors caused by the lensing effect from opening holes of the grid anode and misalignments caused by tilting and curving have been systematically analyzed. An analytical method has been developed, and a full three-dimensional electrostatic field particle tracing simulation has been performed to validate this measurement technique. The results show that a momentatron can provide an accurate measurement of transverse momentum and emittance of the photoemitted electrons. The reasonable experimental errors that may be encountered will only have a modest (few %) effect on the emittance measurement.
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| http://dx.doi.org/10.1063/5.0013122 | DOI Listing |
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