I am going to t6.lk about RF power murcea for accelerator applications. My approach will be with particular c+omus in mind. That customers are high energy phy6icirtr who w accelerator6 66 experimental tool6 in the rtudy of the nucleus of the atom, and rpchrotron light sourea derived from electron or po6itron storage ring6. I will genually confine my6elf to electron-positron linear accelerator6 ...

The 125 kW CW klystrons to be described in the first part of this paper were specifically designed for energy upgrading of the electron-positron storage ring, SPEAR II, at SLAC. Four tubes are required with an efficiency greater than 50 percent. The operating frequency is 358.54 MHz. The gain is approximately 50 dB, the operating voltage is 41 kV and the microperveance is 0.7. The klystron must...

Electron beam halo formation is studied as a potential mechanism for electron beam losses in highpower periodic permanent magnet focusing klystron amplifiers. In particular, a two-dimensional selfconsistent electrostatic model is used to analyze equilibrium beam transport in a periodic magnetic focusing field in the absence of radio-frequency signal, and the behavior of a high-intensity electro...

The fluctuation of the beam current and energy had been investigated from ’98 to ’99. As a result, readjustment of klystron modulators and temperature stabilization were made so as for the RF system to obtain the phase and amplitude stability. Finally, the beam energy fluctuation of ±0.03% (1σ) was achieved and good reappearance of the injection current was obtained. A beam chicane and an accel...

Superconducting CESR RF cavities were designed to handle high RF power delivered to the beam from klystron amplifiers (operating frequency 499.765 MHz). They are strongly overcoupled so that having high Q of the order of 10 they have couplers with external Qext of only 2×10. At a low beam current in the machine, almost full power is reflected from the cavity and goes to the load due to a ferrit...

Preliminary studies of beam dynamics in a relativistic klystron were done to support a design study for a 1 TeV relativistic klystron two-beam accelerator (RK-TBA), 11.424 GHz microwave power source. This paper updates those studies. An induction accelerator beam is modulated, accelerated to 10 MeV, and injected into the RK with a rf current of about 1.2 kA. The main portion of the RK is the 30...

FEL experiments in the NIR region were carried out with a compact storage ring NIJI-IV at the National Institute of Advanced Industrial Science and Technology. Spontaneous emission spectra from the optical klystron ETLOK-III were measured at wavelengths around 850 nm. High-reflectance cavity mirrors were set in mirror chambers this August. The cavity loss was measured to be about 0.2%, and the ...