153 Reduced Model Authoring: A Unique Interface To Electromagnetic Analysis--Simulation Technology & Applied Research, 5020 West Century Court, Mequon, WI 53092-1195; (414) 238-0825 Dr. John F. DeFord, Principal Investigator Dr. John F. DeFord, Business Official DOE Grant No.… More

50604-98-I An Optimization Client for Design Automation--Simulation Technology & Applied Research, 11520 North Port Washington Road, Suite 101B, Mequon, WI 53092-1195; (414) 240-0291 Dr. John F. DeFord, Principal Investigator Dr. John F. DeFord, Business Official DOE Grant No.… More

65194 Tau3p is a new, massively parallel, finite-element-based, time-domain analysis tool that computes electromagnetics fields inside accelerator components in unprecedented detail and accuracy. Despite the tremendous potential of Tau3p to reduce the design costs of new accelerators, there is… More

65194 Tau3P, a powerful electromagnetic analysis program recently developed by the Stanford Linear Accelerator Center, enables unprecedented detail and accuracy of accelerator component design calculations on massively parallel computers. However, the complex process of problem setup, job… More

65194 Tau3P, a powerful electromagnetic analysis program recently developed by the Stanford Linear Accelerator Center, enables unprecedented detail and accuracy of accelerator component design calculations on massively parallel computers. However, the complex process of problem setup, job… More

72893S03-I High-cost klystrons are important components of proposed new accelerators such as the NLC. Highly accurate and detailed electromagnetic analyses are needed to fully understand and mitigate some of the effects that precede tube failure, such as instabilities due to high-order mode… More

High performance vacuum electron devices are widely used radar, communications, sensors, and navigation systems, where they provide an efficient and reliable source of microwave power. For many applications it is extremely important that the device be optimized to provide improvements in… More

79082S High order modes in radio-frequency accelerating cavities typically degrade the performance of high-energy colliders, and consequently a significant effort is put into eliminating or strongly damping these modes. Photon band gap structures are a novel and promising approach to this problem,… More

High-performance vacuum electron devices, such as microwave tubes, are widely used in military electronic battle-space systems. These devices are found in radar, communications, remote sensing, and navigation systems, where they provide an efficient and reliable source of microwave power. The… More

78140S Strong radio-frequency electric fields in high-power components used in colliders can induce a resonant cascade of particles near internal surfaces (called multipacting) that can lead to surface breakdown and device failure, in some cases limiting the power than can be handled to a fraction… More

The development of high-gradient accelerating structures is critical to reducing the cost of next generation particle colliders. In order to develop any novel structure, such as a photo band gap structure, its responses to the drive pulse and to a beam bunch must be fully characterized. This… More

Strong radio-frequency electromagnetic fields in the high-power components used in colliders can induce a resonant cascade of particles near internal surfaces (called multipacting) ¿ which can lead to poor performance and device failure, in some cases limiting the power than can be handled to a… More

High-power klystrons are expensive critical components of proposed high-energy particle accelerators such as the International Linear Collider. Spurious oscillations in traditional pencil-beam klystrons have been a major cause of poor performance and tube failure, requiring expensive retrofitting… More

New high-energy physics accelerators are very expensive to design and build; therefore, predicting and correcting potential failure mechanisms early in the design process can have a substantial impact on overall machine development costs. In particular, understanding and suppressing dark current… More

Highly-efficient physical-modeling software for use on large scale supercomputers is very important to the reduction of development costs of the proposed Advanced Exotic Beam Laboratory (AEBL) project at Argonne National Laboratory (ANL). Although massively parallel hardware can provide for rapid… More

Radio-frequency (RF) breakdowns is an important barrier to obtaining higher field gradients in modern accelerators. Unfortunately, there are presently no simulation tools that allow understanding and quantitative estimation of the damage produced by RF breakdown in realistic accelerating structures… More

High-brightness electron beams are needed for improved power production and reliability of microwave tubes operating in the 80GHz - 300GHz range. At these frequencies, the beam size becomes sufficiently small that beam emittance begins to play a more significant role in the beam dynamics,… More

The conceptual development of new components for use in accelerators, microwave devices, and other endeavors often starts with simplified models, typically in a reduced dimensional space. For radio frequency cavities and other beamline structures, where devices can often be reasonably approximated… More

Understanding and suppressing dark current generation is an important part of designing a variety of high-field-gradient structures, including radio-frequency electron guns, slow-wave structures, and power feed systems. Presently, dark current modeling is needed for the design of the Machine… More

Millimeter-wave tubes that operate in the 80 to 300 GHz range are important sources of microwave power for future communication, remote sensing, and electronic warfare applications. Effective computer design and optimization capabilities are required to develop these tubes due to their small size,… More