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The design and development of a high-perveance sheet electron beam is reported. A beamstick that employs a novel sheet beam gun together with a permanent magnet solenoid has been fabricated and tested up to 4.8 A at 22 kV. At the nominal operating point of 19.5 kV and 3.3 A, this beamstick has transported 98.5% of the emitted electron current through a 0.4 × 5 mm beam tunnel over a distance of 20...
To develop compact, high-power, millimeter wave vacuum electronic amplifiers, it is important to minimize the operating voltage while increasing the operating current. Sheet electron beams are attractive for such amplifiers because if the current density can be maintained at round-beam levels, much higher beam current can be propagated in a sheet beam at a specified voltage. Although previous researchers...
Large particle accelerator projects like the European X-ray Free Electron LASER (XFEL), which is under construction at DESY in Hamburg (Germany), or like the planned International Linear Collider (ILC) favor MBKs for their ability to generate high rf output powers at moderate electron beam energies. For the XFEL, Deutsches Electronen Synchrotron (DESY) ordered a prototype of a horizontally oriented,...
An air cooled, 1 MW klystron with an instantaneous bandwidth of 50 MHz centered about 5625 MHz has been developed for radar applications. Details of the design and test results are presented.
The sheet beam klystron (SBK) is characterized by a large drift tube, which allows the use of high beam current at a low voltage, resulting in low beam current density, high efficiency and the possibility of PPM focusing. CPI has designed, manufactured and is currently testing an X-Band SBK capable of 5 MW peak, 20 kW average output power. This paper discusses the general design, manufacturing and...
CPI has designed and is currently in the process of building a prototype of a horizontally oriented, ges10 MW, ges65% efficiency multiple beam klystron (MBK) operating at 1300 MHz. The klystron, designated the VKL-8301B, was ordered by DESY for the European XFEL. The klystron was designed using of sate-of-the-art multi-dimensional design codes to ensure that all performance requirements are exceeded...
CPI's second generation, 10 MW, 1300 MHz multiple beam klystron (MBK), designated the VKL-8301B, has been developed and is being built for the European X-ray free electron laser (XFEL), which is under construction at DESY in Hamburg (Germany). At 10 MW peak rf output the MBK is required to provide at least 65% efficiency and more than 3 MHz instantaneous -1 dB bandwidth. Average power and rf pulse...
As currently envisioned, approximately 750 10 MW multiple beam klystrons (MBK) will be used to power the ILC accelerator. The critical role of the MBK to the successful operation of the machine makes it a key ILC component. The large quantity required coupled with its technical sophistication also makes it one of the more expensive individual components. CPI has manufactured a prototype MBK that was...
Results of 2.5D large signal modeling of an MBK using TESLA are described. This device was successfully built and delivered to DESY in Hamburg, Germany. Comparison between measured data and code predictions are presented
Summary form only given. The design and operation of a 1.3 GHz higher-order-mode multiple beam klystron (MBK) that has been developed for the TESLA facility will be described. The klystron contains six off-axis electron beams set on a 26.7 cm bolt circle diameter that interact with a combination of TM02 and TM01 mode cavities to efficiently produce high power RF. The off-axis electron beams are the...
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