70838 Dielectric wakefield acceleration is presently being studied intensively as a promising technique to provide efficient and cost effective high gradient acceleration of electrons for next generation linear colliders. This project will develop an experimental scheme to enhance the… More

70838B02-II Dielectric wakefield acceleration is presently being studied intensively as a promising technique to provide efficient and cost effective high gradient acceleration of electrons for next generation linear colliders. This project will develop an experimental scheme to enhance the… More

70838B02-II Dielectric wakefield acceleration is presently being studied intensively as a promising technique to provide efficient and cost effective high gradient acceleration of electrons for next generation linear colliders. This project will develop an experimental scheme to enhance the… More

76057-Dielectric wakefield acceleration is presently being studied intensively as a promising technique for next generation linear colliders. However, development is hampered by the existence of nonuniformities in the dielectric structures, which are intrinsic to the manufacturing process and limit… More

75565-Ferroelectric materials based on BST (barium strontium titanate) could be used as the basis for new advanced-technology microwave and particle accelerator devices. In particular, the electronic properties of this material allow one to create an X-band high-power radio frequency (rf) switch… More

78980B Dielectric wakefield acceleration is presently being studied intensively as a promising technique for advanced high-energy accelerators. Because the reduction of power attenuation is a fundamental issue for the efficiency of any accelerating structure, this project will develop a Multilayer… More

79509B The DOE is seeking new techniques for particle acceleration that are cost effective and efficient. This project will develop and verify one such concept, electron acceleration by a fullerene-based active medium. Phase I will investigate the chemistry of fullerenes in liquid crystal… More

75565B Low loss ferroelectric materials based on BST (barium strontium titanate) could be used as the basis for new advanced technology microwave and particle accelerator devices. The electronic properties of this material would allow one the creation of an X-band, high-power RF switch with peak… More

The DOE is seeking new techniques for particle acceleration that are cost effective and efficient. This project will develop and verify one such concept, electron acceleration by a fullerene-based active medium. In particular, synthesis and manufacturing techniques will be developed for a… More

The present state of the art for superconducting accelerating structures, needed for the International Linear Collider (ILC), has achieved a gradient of 35 MV/m. This project will design, develop, and demonstrate the Superconducting Traveling Wave Accelerating (STWA) Structure to further increase… More

This project will develop a diamond-based, cylindrical, dielectric accelerating (DLA) structure that can sustaining a record accelerating gradient greater than 600 MV/m, significantly in exess of the limits for conventional accelerating structures. The results will be applied to the development of… More

This project will develop a broadband coupling section for the high-gradient dielectric loaded accelerator (DLA). The coaxial-type, DLA coupler design will avoid vacuum gaps between the dielectric sections and thus eliminate any points for potential radio frequency (RF) breakdown. It will allow… More

Dielectric structures driven by wakefields or external radio frequency (RF) are presently being considered as a promising technique for next generation linear colliders. This project will develop dielectric-loaded wakefield accelerating structures that can be adjusted in frequency using a bias… More

The single bunch-beam-breakup instability (BBU) is a potentially serious limitation on the performance of advanced accelerators, particularly those based on the wakefield principle. This project will develop mitigation techniques for BBU, using both experimental and high performance simulation… More

In normal-conducting high gradient accelerating structures, designs are moving toward higher frequencies. The same is true for other microwave applications like radar or communications. This project will develop a new high power radio frequency (RF) source that covers the frequency spectrum from Ku… More

Superconducting radio frequency (RF) technology has been recommended recently as the basis for the accelerating structures of the International Linear Collider (ILC). The present state of the art in superconducting structures has achieved a gradient of 35 MV/m. This project will design, develop… More

In order to provide high gradient acceleration demonstration experiments, a broadband coupling section will be needed for the high-gradient dielectric-loaded accelerator (DLA). This project will develop a coaxial-type coupler that can provide the required mode conversion and the impedance matching… More

Dielectric structures driven by wakefields or external radio frequency (RF) are presently being studied intensively as a promising technique for next generation linear colliders. This project will develop dielectric loaded accelerating structures that can be adjusted in frequency using a bias… More

The single bunch beam breakup (BBU) instability is a potentially serious limitation on the performance of advanced accelerators, particularly those based on the wakefield principle. Development of mitigation techniques for BBU requires both experiment and high performance simulation tools. This… More

The design trend in normal-conducting high gradient accelerating structures is to move toward higher frequencies. The same is true for other microwave applications like radar or communications. This project will develop a new high power radio frequency (RF) source that covers the frequency spectrum… More

As the dimensions of accelerating structures become smaller, or as beam intensities become higher, the transverse wakefields driven by the beam become quite large, even for a slight misalignment of the beam from the geometric axis. These deflection modes can cause inter-bunch beam breakup and… More

This project will develop a diamond-based accelerating structure that can sustain an accelerating gradient larger than 600 MV/m, which would significantly exceed the limits of conventional accelerating structures. Multipacting will be suppressed by dehydrogenation of the diamond surface. In Phase I,… More

The detection of charged particles through Cherenkov radiation has been a powerful technique in particle, nuclear, and beam physics. Use of a dielectric radiator with engineered dispersive properties permits more information about the radiating particle to be obtained than from a simple linear… More

The fast electronic tuning of superconducting cavities is a critical issue for optimizing the RF power distribution for accelerators. A recently proposed tuner design requires new elements made of an improved new ferroelectric material with low microwave loss. Therefore, this project will develop… More

A beam position measurement system is one of the fundamental prerequisites for the successful operation of an accelerator. While large-scale accelerator facilities routinely develop these systems in-house, such systems have been out of reach for many small accelerator facilities, due to their… More

Superconducting structures, such as those used in nuclear physics research, require fast electronic control of the input RF power. The use of nonlinear ferroelectric microwave components represents a promising approach to achieve this control. Applying a bias voltage across a nonlinear… More

High energy particle accelerator structures based on dielectric tubes are presently being studied as a promising technology for next generation linear colliders. This project will develop a diamond-based accelerating structure that can sustain an accelerating gradient larger than 600 MV/m,… More

The current design for the RF couplers for the cavity of the International Linear Collider (ILC) introduces unacceptable emittance growth in the beam. This project will investigate two new couplers designed to mitigate the emittance growth problem by preserving the axial symmetry of the cavity… More

This project will develop an algorithm library for modeling the high frequency and optical properties of dielectric and paramagnetic materials, with an emphasis on problems relevant to the PASER and related systems that are not currently handled well by existing codes. New algorithms will be… More

The current design for the rf couplers for the ILC cavity introduces unacceptable emittance growth in the beam. We have developed two new couplers designed to mitigate the emittance growth problem by preserving the axial symmetry of the cavity fields. Optimization of the design of the coaxial… More

Dielectric Wakefield acceleration is presently being studied intensively as a promising technology for next generation linear colliders. We present here a new experimental device

Ultra-high gradient and ultra-high power rf are preferred for the future high energy collider design, but, due to the rf breakdowns, they are hardly to implement under the rf pulse length (>200ns) that currently are used in many designs. We plan to investigate a dielectric-based two-beam accelerator… More

We submit this proposal to develop dielectric based collimator designs for future linear colliders (CLIC and ILC). We propose a research program on dielectric based collimator studies including collimator impedance optimization, beam dynamics simulations, and, finally, preliminary collimator design… More

Multipactor discharges in dielectric accelerating structures are a major limitation on the performance of this otherwise very promising technology. We propose a research program to study the methods for suppressing it that includes exploration of different geometrical modifications with combination… More

Manufacturing cost of the metal based Power Extraction and Transfer Structure (PETS), one of the core components to of Compact Linear Collider (CLIC), is one of the major concerns to build the next generation high energy physics machine, CLIC. We propose a research program to study the possibility… More

Beam exiting the linac in a soft Xray FEL has an undesirable chirp (head-tail energy spread). We have designed a planar dielectric structure that can remove the chirp by making use of the bunch & apos;s own wakefield. The device is entirely passive, requiring no other external rf power. Using… More

Superconducting rf technology has been recommended recently as the basis for the International Linear Collider, (ILC) accelerating structures. The principal goal of this proposal is development of a new experimental device - the Superconducting Traveling Wave Accelerator (STWA), a technology that… More

The transformer ratio plays a very important and direct role in the efficiency of a collinear wakefield acceleration scheme, but it cannot exceed 2 for the commonly used symmetric drive beam. Appropriate shaping of the temporal profile of the electron bunch can greatly increase the transformer ratio… More

The lattice period in the low energy section of a proton accelerator is required by the physics to be as short as possible; however, the required number of beamline components per period is high. By gradually increasing the diameter of the low energy accelerating cavities (giving them a conical… More

Dielectric based accelerators have potentials to provide a low cost, ultra-high gradient, high energy collider design, but, due to the available rf power limitations in the available test facilities and some design issues in the past, they have not yet been tested to date under high gradient… More

The Compact Linear Collider (CLIC) Power Extraction and Transfer Structure (PETS) is one of the key components in the CLIC two-beam acceleration scheme. According to the 2008 CLIC design parameters [11], 71568 PETS units total are needed for this 3 TeV machine, contributing a large portion of the… More

Ultra-high gradient and ultra-high power rf are preferred for the future high energy collider design, but, due to the rf breakdowns, they are hardly to implement under the rf pulse length ( & gt;200ns) that currently are used in many designs. We propose a collider based on a short rf pulse… More

Short electron beam pulses (subpicosecond) are central to many of the next generation light source initiatives, like X-Ray Free Electron Lasers. These FELs are based on linear accelerators which produce at the output of the last compressor an electron beam with a residual chirp to compensate for… More

The total length and hence cost of the ILC is in part due to limitations of its superconducting standing wave accelerating cavities. We have invented a new technology that can reduce the total length of the ILC by 2/3. We have developed a design for a traveling wave superconducting accelerating… More

The lattice period in the low energy section of a proton accelerator is required by the physics to be as short as possible; however, the required number of beamline components per period is high. By gradually increasing the diameter of the low energy accelerating cavities (giving them a conical… More

One of the most attractive features of dielectric based accelerators are their potential capability of operating at ultra-high gradients, which is highly desirable for future high energy collider designs, as well as for industrial and medical accelerator applications. This prediction of ultra-high… More

Multipactor discharges in dielectric accelerating structures are a major limitation on the performance of this otherwise very promising technology for future high energy physics machines and other applications. We will experimentally study a new approach, using a proper external solenoid field, to… More

Fast electronic tuning of SC cavities is a critical issue for optimized rf power distribution for accelerators. The overall goal of the program is to develop an L-band externally-controlled fast ferroelectric tuner for controlling the coupling of superconducting RF cavities for the future linear… More

Detection of smuggled nuclear materials concealed in cargo containers is an essential need for homeland security. A low cost and efficient method of scanning bulk cargo is to use a tunable energy gamma ray source. Laser plasma accelerators can currently produce (through Thomson backscattering) a… More