graphite heater optimized for a low-emittance ceb6 cathode

IPAC2015

For realizing higher charge and low emittance electron and positron beams in SuperKEKB, we have been making improvements in laser system for RF-gun. The difficulty in controlling thermomechanical distortions has been one of the most important factors for preserving high laser conversion efficiency of infrared-to-ultraviolet and operating at higher repetition rate.

Technological Advances to Maximize Solar Collector

The authors concluded that an optimized HfO x /Mo/HfO 2 multilayer absorber on a Cu substrate exhibits high solar absorptance of α = 0.905–0.923 and low thermal emittance of ε 82 C = 0.07–0.09, whereas on SS substrate, they achieved α = 0.902–0.917 and ε

2017 IEEE Pulsed Power Conference (18

2017/6/18The cathode is of a bimodal carbon fiber (CF) material paired with a pyrolytic graphite anode. These materials display ideal operating characteristics which including but not limited to, long lifetime 10^6 shots, high operating temperatures 1000 K, and large current densities ~200 A/cm2.

2004 NASA SBIR STTR Abstract Archives

Poor wetting is caused by the very low surface energy of the as-produced graphite nano-reinforcements. Opportunities exist for modifying the surface chemistry and energy of nano-reinforcements that will allow improved wetting and provide a means for chemical bonding at the interface with high temperature polymers such as PMR-II-50 polyimide.

The T2K Experiment – arXiv Vanity

The T2K experiment is a long-baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle θ13 by observing νe appearance in a νμ beam. It also aims to make a precision measurement of the known oscillation parameters, dms23 and sstt23, via numu disappearance studies. Other goals of the experiment include various neutrino cross

Poster Presentations

Poster Presentations Continuous to intermittent flow transition in sandpiles Alonso Llanes, Laciel (Cuba) If a granular medium is deposited on a horizontal surface, between two flat and parallel vertical walls, a granular pile is formed due to the flow established on its

2010 8th International Vacuum Electron Sources

artykuł: An improved low power heater cathode assembly for space-TWT (Shiji Yu S., Mingfeng Meng M., Xiaobao Su X., Huiming Fan H., Yanrong Xin Y.), s. 260 - 261 artykuł: Amino-functionalized of multiwalled carbon nanotubes for binding to polymers (,,,

Accelerator Engineering and Technology: Accelerator

Symmetries cause cancellation effects, resulting in low (ideally zero) non-allowed multipoles when compared to the multipoles allowed by the magnet symmetry. Selected multipoles can be further reduced by using design features such as optimization of the coil and iron geometry, or corrections such as passive and active magnetic shims.

(PDF) Building Innovation: A Guide for High

This Building Innovation Guide provides technical recommendations for achieving high-performance Indian office buildings that are smart, green, and energy efficient. the best practices recommended in the Guide are particularly suited to the climatic,

NASA Technical Documents : Free Texts : Free Download,

2017/2/3Intense, steady-state cathode-luminescence has been observed from exposure of quartz powder to a low pressure rf-excited argon plasma discharge. The emission spectra (400 to 850 nm) associated with the powder luminescence were documented as a

Poster Presentations

Poster Presentations Continuous to intermittent flow transition in sandpiles Alonso Llanes, Laciel (Cuba) If a granular medium is deposited on a horizontal surface, between two flat and parallel vertical walls, a granular pile is formed due to the flow established on its

NASA SBIR/STTR 2019 Program Solicitation Details

2020/3/25The Sustainability Base is a green building test-bed whose requirements, as a low-power and low-consumable habitat, are included in those for deep space habitats. Data available includes photo-voltaic array, electrical power, grey water recycling, environmental data (temp, CO 2, etc.) and facility equipment sensors (flowrates, differential pressures, temperatures, etc.).

Study of Unconventional Thermal, Mechanical, and

The heater tubes and cooler tubes are connected to each other through the regenerator, which is usually composed of small cylinders filled with a fine wire matrix. At any instant, the internal working-fluid pressure is essentially uniform, since the working spaces formed by the two pistons are connected to each other through the cooler tubes, regenerator, and heater tubes.

2001 NASA SBIR STTR Abstract Archives

The benefits of this architecture are (1) reduced weight, (2) simplified assembly of fewer parts, and (3) the opportunity to scale the grids to large area for high-thrust engines. Glassy carbon grids will be investigated because it offers low sputter-yield, low-CTE, and

2001 NASA SBIR STTR Abstract Archives

The benefits of this architecture are (1) reduced weight, (2) simplified assembly of fewer parts, and (3) the opportunity to scale the grids to large area for high-thrust engines. Glassy carbon grids will be investigated because it offers low sputter-yield, low-CTE, and

Study of Unconventional Thermal, Mechanical, and

The heater tubes and cooler tubes are connected to each other through the regenerator, which is usually composed of small cylinders filled with a fine wire matrix. At any instant, the internal working-fluid pressure is essentially uniform, since the working spaces formed by the two pistons are connected to each other through the cooler tubes, regenerator, and heater tubes.

NASA Technical Documents : Free Texts : Free Download,

2017/2/3Intense, steady-state cathode-luminescence has been observed from exposure of quartz powder to a low pressure rf-excited argon plasma discharge. The emission spectra (400 to 850 nm) associated with the powder luminescence were documented as a

Journal of Physics: Conference Series, Volume 700, 2016

2016/4/7Volume 700 2016 Previous issue Next issue 19th International Summer School on Vacuum, Electron and Ion Technologies (VEIT2015)21–25 September 2015, Sozopol, Bulgaria Accepted papers received: 29 February 2016 Published online: 07 April 2016

Materials Research Express, Volume 5, Number 6, June

The formation reaction were optimized by varying the concentration of ferric nitrate solution (Fe(NO 3) 3) (0.1, 0.3, 0.5, 0.7 and 1.0 M). All samples were characterized by means of x-ray Diffractometer (XRD), Raman Spectroscopy, Transmission Electron

Superconducting Supercollider SSC Reports and

2013/3/19P.O. Box 500, MS 109, Batavia, IL 60560, WH3W 630-840-5693 techpubsfnal.gov Superconducting Supercollider SSC Reports and Preprints Clicking on the link will take you to the INSPIRE entry for the SSC report. Please contact libraryfnal.gov with any questions or information about this page.

IPAC2015

Injector linac at KEK is now under the way to produce high current and low emittance beams for SuperKEKB. The target luminosity for SuperKEKB is 40 times higher than that of KEKB. Short-range transverse wakefield and dispersive effects at the linac cause an emittance growth, and longitudinal wakefield effect enlarges an energy spread of the beams.

Journal of Physics: Conference Series, Volume 700, 2016

2016/4/7Volume 700 2016 Previous issue Next issue 19th International Summer School on Vacuum, Electron and Ion Technologies (VEIT2015)21–25 September 2015, Sozopol, Bulgaria Accepted papers received: 29 February 2016 Published online: 07 April 2016

EMIS 2018 (16

2018/9/16The International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS) will be held at CERN, the European Organization for Nuclear Research, in Geneva, Switzerland, from 16th to 21st September 2018. The EMIS 2018 conference will be hosted by ISOLDE, CERN. EMIS is the flagship conference series on techniques in the field of low-energy nuclear science. EMIS 2018

15th European Vacuum Conference (EVC

2018/6/17We assume that a hot cathode ion gauge can be made more stable by using an electron source for introducing an accelerated electron beam into the ionization volume in a straight path. By doing so, the electron trajectories, kinetic energy and current inside the ionization volume could be well defined and stable.The electron beam should have an energy of about 200 eV for stable ionizing the gas.

The T2K Experiment – arXiv Vanity

The T2K experiment is a long-baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle θ13 by observing νe appearance in a νμ beam. It also aims to make a precision measurement of the known oscillation parameters, dms23 and sstt23, via numu disappearance studies. Other goals of the experiment include various neutrino cross

Development Of Thin Films For More Efficient Solar Cells

Window coatings with external optical performance factors are said to have static properties ( Lampert, 1985, Chopra, et al, 1983). This group is subdivided into two coatings which are solar controlled and low thermal emittance. The second group has dynamic