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The design for the Next Linear Collider (NLC) at SLAC is based on two 11.4 GHz linacs operating at an unloaded acceleration gradient of 50 MV/m increasing to 85 MV/m as the energy is increased from 1/2 TeV to 1 TeV in the center of mass[1]. During the past several years there has been tremendous progress on the development of 11.4 GHz (X-band) RF systems.(More)
The linacs proposed for the Next Linear Collider (NLC) and Japanese Linear Collider (JLC) would contain several thousand X-Band accelerator structures that would operate at a loaded gradient of 50 MV/m. An extensive experimental and theoretical program is underway at SLAC, FNAL and KEK to develop structures that reliably operate at this gradient. The(More)
The NLC (Next Linear Collider) and GLC (Global Linear Collider) [1,2] are e e linear collider proposals based on room-temperature accelerator technology – so called “warm machines” in comparison with the TESLA “cold machine” that is based on superconducting accelerator technology. There have been two major challenges in developing X-band (11.4 GHz)(More)
There are many challenges in the design of the normalconducting portion of the ILC positron injector system such as achieving adequate cooling with the high RF and particle loss heating, and sustaining high accelerator gradients during millisecond-long pulses in a strong magnetic field. The proposed design for the positron injector contains both(More)
The Binary Pulse Compression system installed at SLAC was tested using two klystrons, one with 10 MW and the other with 34 MW output. By compressing 56@ ns klystron pulses into 70 ns, the measured BPC output wss 175 MW, limited by the available power from the two klystrons. This output was used to provide 10GMW input to a 36cell X-band structure in which a(More)
During the initial phase of operation, the linacs of the Next Linear Collider (NLC) will contain roughly 5000 XBand accelerator structures that will accelerate beams of electrons and positrons to 250 GeV. These structures will nominally operate at an unloaded gradient of 72 MV/m. As part of the NLC R&D program, several prototype structures have been built(More)
This paper reports continuing work on high-gradient ac--celerator structures for future TeV linear colliders. A prerequisite of these structures is that they heavily damp wakefield modes which can be induced by e* bunch trains. Disk-loaded waveguide structures under investigation have radial slots in the disks and/or radial rectangular waveguides in the(More)
This paper presents a status report on RF field emission and high-gradient breakdown studies in linac structures at SLAC. The motivation behind these studies, begun in 1984, is to determine the maximum accelerating field gradients that could be used safely in future e* colliders, to contribute to the basic understanding of the RF breakdown mech. anism, and(More)
The next generation of linear colliders requires peak power sourcesof-over 200 MW per meter at frequencies above 10 GHz at pulse widths of less than 100 nsec. Several power sources are under active development, including a conventional klystron with RF pulse compression, a relativistic klystron (RK) and a crossed-field amplifier. Power from one of these has(More)