Advanced photoinjector experiment photogun commissioning results
| Autor: | C. F. Papadopoulos, Lawrence Doolittle, Jennifer Doyle, D. Garcia Quintas, M. Vinco, C.W.Cork, V. Moroz, G. Portmann, M. Zolotorev, Jun Feng, S. De Santis, Kenneth Baptiste, F. Zucca, S. Dimaggio, H. A. Padmore, S. Kwiatkowski, John Staples, Fernando Sannibale, W.E. Norum, Chris Pappas, Russell Wells, J.N. Corlett, B. Bailey, R. Lellinger, H. Huang, Theodore Vecchione, Daniele Filippetto, Tobin Kramasz, Gang Huang |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Nuclear and High Energy Physics Physics and Astronomy (miscellaneous) business.industry Phase (waves) Surfaces and Interfaces Injector Laser Linear particle accelerator law.invention Optics Beamline law lcsh:QC770-798 Continuous wave lcsh:Nuclear and particle physics. Atomic energy. Radioactivity business Beam (structure) Electron gun |
| Zdroj: | Physical Review Special Topics. Accelerators and Beams, Vol 15, Iss 10, p 103501 (2012) |
| ISSN: | 1098-4402 |
| DOI: | 10.1103/physrevstab.15.103501 |
| Popis: | The Advanced Photoinjector Experiment (APEX) at the Lawrence Berkeley National Laboratory is dedicated to the development of a high-brightness high-repetition rate (MHz-class) electron injector for x-ray free-electron laser (FEL) and other applications where high repetition rates and high brightness are simultaneously required. The injector is based on a new concept rf gun utilizing a normal-conducting (NC) cavity resonating in the VHF band at 186 MHz, and operating in continuous wave (cw) mode in conjunction with high quantum efficiency photocathodes capable of delivering the required charge at MHz repetition rates with available laser technology. The APEX activities are staged in three phases. In phase 0, the NC cw gun is built and tested to demonstrate the major milestones to validate the gun design and performance. Also, starting in phase 0 and continuing in phase I, different photocathodes are tested at the gun energy and at full repetition rate for validating candidate materials to operate in a high-repetition rate FEL. In phase II, a room-temperature pulsed linac is added for accelerating the beam at several tens of MeV to reduce space charge effects and allow the measurement of the brightness of the beam from the gun when integrated in an injector scheme. The installation of the phase 0 beam line and the commissioning of the VHF gun are completed, phase I components are under fabrication, and initial design and specification of components and layout for phase II are under way. This paper presents the phase 0 commissioning results with emphasis on the experimental milestones that have successfully demonstrated the APEX gun capability of operating at the required performance. |
| Databáze: | OpenAIRE |
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