In view of a possible evolution of the CERN accelerator complex towards higher proton intensities, a 2.2 GeV H linac with 4 MW beam power has been designed, for use in connection with an accumulator and compressor ring as proton driver of a muon-based Neutrino Factory. The high-energy part of this linac can use most of the RF equipment (superconducting cavities and klystrons) from the LEP colli...

A 325 MHz aluminum prototype of a spatially periodic RF quadrupole focusing linac was developed at the Institute Modern Physics, Chinese Academy Sciences, as promising candidate for front end high-current linac. It consists an alternating series crossbar H-type drift tubes and sections. Owing to its special geometry, cavity fabrication is major hurdle engineering development application. In thi...

Ahstrucl Two accelerator configurations, the linac/compressor ring scheme and the Iinac/RCS scheme, are commonly used to provide the proton beam power for a short-pulse spallation neutron source. In one configuration, a fullpower linac provides the beam power and a compressor ring shortens the pulse length from I-ms down to 1 p. In the other, rapid cycling synchrotrons (RCSs) provide the beam p...

The TRIUMF ISAC facility has two variable energy heavy ion linacs as post accelerators for radioactive ion beams. The ISAC I linac is a warm IH-DTL with five accelerating tanks and three bunchers, the ISAC II linac uses twenty independently phased superconducting cavities. The first linac operates between 150keV/u and 1.8Mev/u; the second boosts the 1.5MeV/u injected beam by 20MV. The DTL is tu...

ISAC is the TRIUMF facility for the production and post acceleration of Rare Isotope Beams (RIBs). The post acceleration section includes two normal conducting linacs, an RFQ injector and a variable energy IH-DTL, and a superconducting linac composed of five cryomodules each containing four quarter wave bulk niobium resonators. All three machines operate CW. The RFQ and DTL deliver beam since 2...

Electron linacs in the 100 MeV to 25 GeV energy range have by now been in operation for periods ranging from one year to over 20 years. In 1951 the Mark III accelerator at Stanford became the first electron linac to exceed an energy of 100 MeV. Since then significant increases in maximum electron energy have been made by the h'Iark III (reaching an energy of 1 GeV in 1960) and SLAC (exceeding 2...

The transverse emittances in the SLAC Linear Collider can be severely diluted by collective wakefield effects and dispersion. For the 1997/98 SLC/SLD run important changes were implemented in the way the emittance is optimized. Early in the linac, where the energy spread is large due to BNS damping, the emittance growth is dominated by dispersion. In this regime emittance tuning bumps may intro...

Each arm of the NLC Main Linac is almost 11 km in length; including the final focus region, the total complex extends over 30 km. Were it to be constructed using straight-line tunneling, its sagitta relative to a gravitational equipotential surface would be about 18 meters. While that seems like a small number, its impact on pumping requirements is significant. Further, if the tunnel is dug usi...

There is growing interest in the generation and characterization of femtosecond and subfemtosecond pulses from linac-based free-electron lasers (FELs). In this report, following the method of Ricci and Smith [Phys. Rev. STAccel. Beams 3, 032801 (2000)], we investigate the measurement of the longitudinal bunch profile of an ultrashort electron bunch produced by these FELs. We show that this meth...

* This work supported by the U.S. Department of Energy under Contract No. DE-AC03-76SF00098 Abstract We present an updated design for a proposed source of ultra-fast synchrotron radiation pulses based on a recirculating superconducting linac [1,2], in particular the incorporation of EUV and soft x-ray production. The project has been named LUX – Linac-based Ultrafast X-ray facility. The source ...