Award Data

65614 The quantum efficiency of a photocathode limits overall device performance in photomultiplier tubes used in nuclear physics research. This project will develop more efficient photocathodes using nanowire technology. In particular, the production of nanowire photocathodes will be optimized, and the physical mechanisms that control their performance will be identified. In Phase I, gol ...

65565 This project will modify a laser-driven vacuum accelerator at Brookhaven National Laboratory to produce a train of ~4 fs electron bunches spaced by 35 fs that can be manipulated to have sheet-like transverse profiles. These microbunches can be used to generate intense accelerating fields in dielectric microstructures, and possibly allow the future design of a high energy electron-posi ...

65395 Efforts are underway to develop a high-gradient electron accelerator operating at 34 GHz, to be driven by a newly-developed radio frequency (rf) magnicon amplifier. Yet few corresponding high-power components have been developed to provide rf power manipulation and transmission between the magnicon and the accelerator. This project will develop a variety of high-power Ka-band rf c ...

65074 Continued progress in high-energy physics demands a new high energy electron-positron collider, which in turn requires new high-power, high-frequency radio frequency (RF) technology. Development of RF technology at 34.272 GHz could allow three times the accelerating gradient compared to 11.424 GHz. This project will develop a novel test device for subjecting RF structures at 34.272 GHz ...

72922-In order to achieve the high peak power required to drive a future electron-positron collider, an approach known as DLDS (delay line distribution system) combines the output powers of eight 75-MW X-band klystrons, and directs one-quarter-width slices out of the 600 MW, 1.6 microsecond pulse to four successive accelerator sections using phase interference due to rapid klystron phase shifts. ...

72041-The quest for an ever-increasing acceleration gradient for a high-energy linear collider leads naturally to considerations of producing energy at millimeter wavelengths. As at centimeter wavelengths, radio frequency pulse compression is needed to produce the required high peak power pulses. Therefore, this project will develop quasi-optical passive and active pulse compression structures. ...

72923-Radio frequency (RF) pulse compression is required to achieve the high peak powers needed for testing accelerator structures and components, and ultimately for driving the accelerator structures. This project will develop a whispering gallery resonator, or coupled pair of resonators, as a passive pulse compressor that can provide efficient peak power multiplication (greater than 4 to 1) at ...

72818-Methane hydrates comprise a large potential energy source for the U.S. The thermal dissociation of methane hydrates by the injection of a hot fluid offers the potential to economically, effectively, and controllably produce natural gas from methane hydrate deposits, along with the potential for CO2 sequestration. However, heat losses from the injection at the surface may exceed the heating ...

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65549 Conventional duct systems in houses have serious deficiencies. Usually, they are located in very hot or very cold attics with little insulation to protect them, and often they have excessive leaks and construction-caused defects. These problems result in energy losses, widely fluctuating indoor comfort conditions, and the transport of air-borne contaminants from unconditioned to condi ...