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Title: Short Period Model Helical Undulator for the ILC – Design and Demonstration

 [1];  [1]
  1. Hyper Tech Research Inc., Columbus, OH (United States)
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Hyper Tech Research Inc., Columbus, OH (United States)
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Resource Type:
Technical Report
Country of Publication:
United States

Citation Formats

Peng, Xuan, and Tomsic, Mike. Short Period Model Helical Undulator for the ILC – Design and Demonstration. United States: N. p., 2016. Web.
Peng, Xuan, & Tomsic, Mike. Short Period Model Helical Undulator for the ILC – Design and Demonstration. United States.
Peng, Xuan, and Tomsic, Mike. 2016. "Short Period Model Helical Undulator for the ILC – Design and Demonstration". United States. doi:.
title = {Short Period Model Helical Undulator for the ILC – Design and Demonstration},
author = {Peng, Xuan and Tomsic, Mike},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9

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  • Analysis is described towards development of a RF undulator with a period < 1 cm, an undulator parameter K of the order of unity, and a gap greater than 2.25 mm. The application for the undulator is for a SASE source to produce 1 nm wavelength radiation using a low energy electron beam in the range 1-2 GeV. Particle orbit calculations in a conventional standing-wave resonator configuration show that the presence of a co-propagating component of RF field can cause deleterious motion for the undulating electrons that can seriously degrade their radiation spectrum. To obviate this problem, resonator designs weremore » devised in which only the counter-propagating field components interact with the particles. Two resonator configurations with the same undulator parameter K = 0.4 have been devised and are described in this report.« less
  • A 1-MW geothermal wellhead power plant incorporating a Lysholm or helical screw expander (HSE) was field tested between 1980 and 1983 by Mexico, Italy, and New Zealand with technical assistance from the United States. The objectives were to provide data on the reliability and performance of the HSE and to assess the costs and benefits of its use. The range of conditions under which the HSE was tested included loads up to 933 kW, mass flowrates of 14,600 to 395, 000 lbs/hr, inlet pressures of 64 to 220 psia, inlet qualities of 0 to 100%, exhaust pressures of 3.1 tomore » 40 psia, total dissolved solids up to 310,000 ppM, and noncondensible gases up to 38% of the vapor mass flow. Typical machine efficiencies of 40 to 50% were calculated. For most operations efficiency increased approximately logarithmically with shaft power, while inlet quality and rotor speed had only small effects. The HSE was designed with oversized internal clearances in the expectation that adherent scale would form during operation. Improvements in machine efficiency of 3.5 to 4 percentage points were observed over some test periods with some scale deposition. A comparison with a 1-MW back-pressure turbine showed that the HSE can compete favorably under certain conditions. The HSE was found to be a rugged energy conversion machine for geothermal applications, but some subsystems were found to require further development. 7 refs., 28 figs., 5 tabs.« less