To produce energies of over 50 GeV for SLC, all klystron stations on the accelerator ue being upgraded to produce 250 MeV energy contribution per station. This involves installii new, higher power, longer pulse klystrons, upgrading klystron modulators to provide these higher voltage, longer klystron beam pulses, and a new interlock and protection system.’ A new VAX based diagnostic system inclu...

Each of the eight 1.2 MW RF klystrons for the PEP-II storage rings require a 2.5 MVA DC power supply of 83 Kv at 23 amps. The design for the suply was based on three factors: low cost, small size to fit existing substation pads, and good protection against damage to the klystron including klystrong gun arcs. The supply uses a 12 pulse 12.5 KV primary thyristor “star point controller” with prima...

SLAC is developing a 10 MW, 5 Hz, 1.6 ms, L-band (1.3 GHz) Sheet-Beam Klystron as a less expensive and more compact alternative to the ILC baseline MultipleBeam Klystron. The Klystron is intended as a plugcompatible device of the same beam current and operating voltage as existing Multiple-Beam Klystrons. At this time, a beam tester has been constructed and currently is in test. The beam tester...

The next generation of colliding beam storage rings support higher luminosities by significantly increasing the number of bunches and decreasing the spacing between respective bunches. The heavy beam loading requires large RF cavity detuning which drives several lower coupled bunch modes very strongly. One technique which has proven to be very successful in reducing the coupled bunch mode drivi...

We have developed a new method for a realistic and more accurate simulation of klystron using the MAGIC code. MAGIC is the 2.5-D or 3-D, fully electromagnetic and relativistic particle-in-cell code for self-consistent simulation of plasma. It solves the Maxwell equations in time domain at particle presence for a given geometrical structure. It uses no model or approximation for the beamcavity i...

A useful diagram is presented and used to study rf cavity voltage regulation in a damping ring or other circular accelerator where large beam currents are injected and extracted rapidly. With conventional feedback systems and high particle beam currents, the maximum beam current can be limited by the ability of the klystron to maintain constant gap voltage at high currents, low currents, or in ...

We examine a scheme for a Free Electron Laser (FEL) harmonic amplifier seeded by a 30-nm wavelength signal produced using a process of High-order Harmonic Generation (HHG). The seed is first amplified in an optical klystron from 100 kW to 30 MW using a 1 GeV electron beam and then is used for an energy modulation of electrons in the downstream undulator. Subsequently, a 100MW level of radiation...

* This work is supported by the Department of Energy under Contract DE-AC03-76SF00515 Abstract The Stanford Linear Accelerator Center (SLAC) klystron group is currently designing, fabricating and testing 11.424 GHz klystrons with peak output powers from 50 to 75 MW at 1 to 2 μs rf pulsewidths as part of an effort to realize components necessary for the construction of the Next Linear Collider (...

B. Jia,* J. Li, S. Huang, Scott C. Schmidler, and Y.K. Wu Department of Physics, Duke University, Durham, North Carolina 27708, USA DFELL, Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA IHIP, School of Physics, Peking University, Beijing 100871, China Department of Statistical Science, Duke University, Durham, North Carolina 27708, USA (Received 28 May 2010; publish...