English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A number of new initiatives at Jefferson Lab will benefit from the construction of a dc high voltage photogun operating at 350 kV bias voltage. These initiatives include: a) the construction of a compact 10 MeV electron accelerator for commissioning new hardware destined for CEBAF, including the polarized target HDIce, b) replacing the vent-and-bake photogun at the Jefferson Lab energy recovery linac with a load-locked photogun and alkali-antimonide photocathode deposition chamber, and c) a 350 kV photogun used to study high bunch-charge magnetized beams needed for cooling proton beams at the Electron Ion Collider. There has been great progress worldwide developing photoguns operating at 350 kV and even higher. This contribution describes Jefferson Lab’s efforts to build such a gun, but with an inverted-insulator geometry. The inverted-insulator geometry offers advantages over gun designs that employ large cylindrical insulators, but it introduces at least one new challenge, namely, how to reliably apply voltage to the cathode electrode via a high voltage cable without breakdown, which sometimes leads to puncture and catastrophic failure of the insulator. In addition, this contribution describes recent studies devoted to improving our understanding of field emission, and methods to eliminate it.

Ongoing efforts to construct a 350 kV dc high voltage photogun with inverted insulator geometry