TUYAUD01
JLab, Newport News, Virginia, USA
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TUYAUD01 |
Overview of Development of High Current Electron Sources for ERL Based Bunched Beam Electron Cooling | |
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| New initiatives at Jefferson Lab require photoguns operating at 350 kV bias voltage. These initiatives include the construction of a test beamline to study high bunch-charge magnetized beams needed for cooling proton beams at electron-ion colliders. Worldwide, a number of groups have made great progress developing photoguns operating at 350 kV and 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. The talk will conclude with a brief discussion of perceived advantages/disadvantages of different high current electron gun options, which could serve as starting-point road map aimed at identifying necessary future R&D. | ||
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Slides TUYAUD01 [70.987 MB] | |
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