This research will investigate the feasibility of and techniques for extracting microwave power from a free electron laser using a septum coupler and for transporting the rf wave to feed a high gradient structure in a two-beam accelerator. numerical simulations will be used to study the geometric… More

This research investigates the feasibility of a new version of an induction linac-driven free-electron laser (fel) as a source of high microwave power for a 17 ghz, high gradient (150 mv/m) linear accelerator. in phase i theoretical design studies will be performed to analyze the power transport… More

The proposed research is aimed at eliminating the significant gap that exists between the performance of present-day linear induction accelerator (lia) driven microwave devices and the level required for these devices to be useful power sources for future advanced particle accelerators. during the… More

We have proposed a method to reduce the size of a compact x-ray lithography machine used for etching the next-generation high-density computer chips. a high gradient electron accelerator powered by a relativistic klystron is used in place of the conventional linac as an injector to a superconducting… More

This project is to demonstrate the feasibility of a sheet-beam klystron (sbk) as a device to generate high power (>200 mw), high frequency (11.4 ghz), microsecond-longmicrowaves with high efficiency (60%). sbk is an extended concept of the conventional klystron, with the round beam replaced by a… More

This project will investigate methods of extracting microwave power from a cluster klystron by combining several low-current, medium-power klystrons to produce high peak power with very high efficiency. a cluster klystron in combination with a pulse compression system can be used as a radiofrequency… More

The goal of this project is the development of a heavy ion stripping technique to achieve a high charge state beam. the ion stripper proposed here could be added to existing single charge state, low emittance, high brightness ion sources. using high charge state beams in a driver for heavy ion… More

A novel high-yield positron source based on coherent pair creation from the collision of a high power laser beam with a high energy electron beam is planned for this project. the laser-produced positrons have a low transverse emittance and a narrow spectrum, peaking at an energy much below the… More

40834 November 13, 1996 Duly Research This project will design an ultra-high frequency planar accelerating structure (PAS) for future linear colliders which has distinct advantages over conventional, cylindrical structures. Phase I will study the… More

40833 November 13, 1996 Duly Research, Inc. It is desirable to relax manufacturing tolerances and reduce cost for linear accelerator structures, especially for repetitive production of accelerating sections as in a linear collider, or for mass production… More

50321-98-I A High-Brightness, X-Band Photoelectron Linac--Duly Research, Inc., 1912 MacArthur Street, Rancho Palos Verdes, CA 90275-1111; (310) 548-7123 Dr. David U.L. Yu, Principal Investigator Dr. David U.L. Yu, Business Official DOE Grant No. DE-FG03-98ER82566 Amount: $75,000 The goal of this… More

65357 High-power pulsed radio-frequency (rf) waves are needed to accelerate electrons in linear colliders and advanced accelerators. In a two-beam-accelerator (TBA) scheme, the rf power extracted from a high-current, bunched drive beam is used to provide energy gain to another low-current,… More

70801 Photonic band gap (PBG) structures, well known in solid state physics, have recently been proposed for applications as particle accelerators or high power microwave/millimeter wave sources. In spite of their relative ease of fabrication, practical issues such as power handling,… More

70868 The radio frequency (rf) photoinjector is one of the great accelerator inventions in recent years. Unfortunately, its performance is limited by space charge effects, particularly at the cathode where electrons are first created at thermal energies. The lowest emittance achieved so… More

65357 Future linear colliders require efficient and cost effective high power radio frequency (rf) sources to accelerate electron/positrons. This project will develop a ceramic rf power extractor as a simple device to meet this need. In the ceramic rf power extractor, a train of high-charge… More

70802 Future linear colliders will require a polarized electron source with large spin polarization (>80%), high quantum efficiency, long cathode life, maximum peak and average current, and low emittance. Currently, polarized electron beams for accelerators are generated using dc-biased… More

70867 The advent of high intensity lasers using chirped pulse amplification has allowed for the creation of highly energetic electrons in plasma, generated at the interaction site between the laser and a solid target. These high energy electrons are subsequently responsible for the… More

65357 Future linear colliders require efficient and cost effective high power radio frequency (rf) sources to accelerate electron/positrons. This project will develop a ceramic rf power extractor as a simple device to meet this need. In the ceramic rf power extractor, a train of high-charge… More

70801S02-II Photonic band gap (PBG) structures have been proposed for applications as particle accelerators or high power microwave/millimeter wave sources. PBG structures have unique modal properties that cause some modes to be ¿trapped¿ within a portion of the lattice while other modes exist… More

70801S02-II Photonic band gap (PBG) structures have been proposed for applications as particle accelerators or high power microwave/millimeter wave sources. PBG structures have unique modal properties that cause some modes to be ¿trapped¿ within a portion of the lattice while other modes exist… More

70802S02-II Future linear colliders require high brightness, polarized electron/positron beams for high energy physics experiments. Although photoelectrons with over 80% polarization have been produced in dc guns, the transverse emittance of the polarized electron beam from the dc gun is not… More

70868S02-II The radio frequency (RF) photoinjector is one of the great accelerator inventions in recent years. Unfortunately, its performance is limited by space charge effects, particularly at the cathode where electrons are first created at thermal energies. The lowest emittance achieved so… More

70868S02-II The radio frequency (RF) photoinjector is one of the great accelerator inventions in recent years. Unfortunately, its performance is limited by space charge effects, particularly at the cathode where electrons are first created at thermal energies. The lowest emittance achieved so… More

70802S02-II Future linear colliders require high brightness, polarized electron/positron beams for high energy physics experiments. Although photoelectrons with over 80% polarization have been produced in dc guns, the transverse emittance of the polarized electron beam from the dc gun is not… More

The International Linear Collider (ILC), which is to be built in the next decade, requires an electron injector that provides a highly polarized beam with high brightness. Current dc-gun-based, polarized electron sources cannot achieve the low emittance required by the ILC, and a complicated and… More

The high-power radio frequency (RF) amplifiers and microwave oscillators, used in the klystrons that power accelerators for high energy physics research, require stability, efficiency, and reliability. Parasitic oscillations, which limit klystron performance, are caused by beam interaction with… More

This project will design a tabletop photoelectron gun that provides a subpicosecond-to-femtosecond, high-brightness, electron beam source for a broad variety of applications in DoE accelerators. In this approach, a radio frequency (RF) gun will be integrated with a robust, efficient,… More

The International Linear Collider (ILC) needs a polarized electron source capable of producing an electron beam with 85% polarization, when illuminated by a circularly polarized laser. The current design of the ILC polarized electron source is based on a DC gun and a subharmonic buncher, followed… More

SF6 is widely used as an insulating gaseous medium in electric power industry, high voltage research and military applications because of its superior dielectric and chemical properties. However, SF6 is one of the six greenhouse gases regulated under the Kyoto Protocol due to its high global warming… More

Several current and proposed particle accelerator projects for nuclear physics research require a polarized electron source capable of producing an electron beam with 85% polarization. The current design of the polarized electron injector is based on a dc gun with buncher and capture sections,… More

Attaining high peak fields at terahertz (THz) frequencies is among the highest priorities among the common R&D goals of the DOE-NSF-NIH triad. However, THz science and technology have been underdeveloped because of the unavailability of effective and affordable THz sources. The few THz facilities… More

The International Linear Collider (ILC) will need more than five hundred modulators to provide pulsed power to 10-MW long-pulse (1.4 ms) klystrons. A Marx modulator controlled by solid state switches promises higher efficiency, longer lifetime, and reduced cost compared with existing hard tube… More

The International Linear Collider (ILC) will need hundreds of modulators to power the 10-MW, long pulse (1.4 ms) klystrons. A Marx modulator controlled by solid-state switches promises higher efficiency, longer lifetime, and reduced cost compared to existing hard tube modulator options. However,… More

Adjustable input couplers for both normal conducting (NC) and superconducting (SC) RF cavities are among the highest priorities for advanced accelerators at DOE user facilities. However, existing adjustable couplers are severely limited by the range of coupling coefficients, as well as by their… More