scholarly journals Decommissioning and Safety Issues of Liquid-Mercury Waste Generated from High-Power Spallation Sources with Particle Accelerators

2009 ◽  
Vol 168 (2) ◽  
pp. 264-269
Author(s):  
S. Chiriki ◽  
J. Fachinger ◽  
R. Moormann ◽  
H.-K. Hinssen ◽  
A. Bukaemskiy ◽  
...  
Keyword(s):  
High Power ◽  
Particle Accelerators ◽  
Safety Issues ◽  
Liquid Mercury

scholarly journals A reflexing electron microwave amplifier for rf particle accelerator applications

1988 ◽  
Vol 6 (3) ◽  
pp. 613-620
Author(s):  
M. V. Fazio ◽  
R. F. Hoeberling
Keyword(s):  
High Power ◽  
Microwave Power ◽  
Phase Locking ◽  
Pulse Length ◽  
Low Frequency ◽  
Particle Accelerator ◽  
Particle Accelerators ◽  
Power Sources ◽  
Microwave Amplifier ◽  
Very High

The evolution of rf-accelerator technology toward high-power, high-current, lowemittance beams produces an ever-increasing demand for efficient, very high power microwave power sources. The present klystron technology has performed very well but is not expected to produce reliable gigawatt peak-power units in the 1- to 10-GHz regime. Further major advancements must involve other types of sources. The reflexing-electron class of sources can produce microwave powers at the gigawatt level and has demonstrated operation from 800-MHz to 40-GHz. The pulse length appears to be limited by diode closure, and reflexing-electron devices have been operated in a repetitively pulsed mode. A design is presented for a reflexing electron microwave amplifier that is frequency and phase locked. In this design, the generated microwave power can be efficiently coupled to one or several accelerator loads. Frequency and phase-locking capability may permit parallel-source operation for higher power. The low-frequency (500-MHz to 10-GHz) operation at very high power required by present and proposed microwave particle accelerators makes an amplifier, based on reflexing electron phenomena, a candidate for the development of new accelerator power sources.

Design of Simulated Server Racks for Data Center Research

2011 ◽  
Author(s):  
James F. Smith ◽  
Waleed A. Abdelmaksoud ◽  
Hamza S. Erden ◽  
John F. Dannenhoffer ◽  
Thong Q. Dang ◽  
...  
Keyword(s):  
High Power ◽  
Data Center ◽  
Temperature Limit ◽  
Operating Conditions ◽  
Heating Power ◽  
Substantial Part ◽  
Thermal Mass ◽  
Safety Issues ◽  
Typical Data ◽  
Line Temperature

Conducting experiments on real high-density computer servers can be an expensive and risky task due to the risks associated with unintended inlet temperatures that exceed the server’s red-line temperature limit. Presented herein is the development of the simulated chassis that mimic real computer servers. Briefly, twelve high-power simulated chassis were designed and built to accurately simulate the actual operating conditions of a real computer chassis in a data center. Each simulated chassis is designed to have approximately 300 Pa pressure drop at a flow rate of 600 cfm to represent a real IBM server chassis. Additionally, the simulated chassis are designed to match the thermal mass of a real server. Eight of the simulated chassis were designed to have constant speed fans and variable heating power while the remaining four chassis were designed to have variable speed fans and variable heating power. Further discussions about the design phase of the simulated chassis are the substantial part of this paper. Underlining the challenges and safety issues with high-power chassis, guidelines for designing and constructing a chassis that simulates the real environment of a typical data center are presented.

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