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486 Matching Results
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X-Band Photonic Band-Gap Accelerator Structure Breakdown Experiment
In order to understand the performance of photonic band-gap (PBG) structures under realistic high gradient, high power, high repetition rate operation, a PBG accelerator structure was designed and tested at X band (11.424 GHz). The structure consisted of a single test cell with matching cells before and after the structure. The design followed principles previously established in testing a series of conventional pillbox structures. The PBG structure was tested at an accelerating gradient of 65 MV/m yielding a breakdown rate of two breakdowns per hour at 60 Hz. An accelerating gradient above 110 MV/m was demonstrated at a higher breakdown rate. Significant pulsed heating occurred on the surface of the inner rods of the PBG structure, with a temperature rise of 85 K estimated when operating in 100 ns pulses at a gradient of 100 MV/m and a surface magnetic field of 890 kA/m. A temperature rise of up to 250 K was estimated for some shots. The iris surfaces, the location of peak electric field, surprisingly had no damage, but the inner rods, the location of the peak magnetic fields and a large temperature rise, had significant damage. Breakdown in accelerator structures is generally understood in terms of electric …
Date:
June 11, 2012
Creator:
Marsh, Roark A.; Shapiro, Michael A.; Temkin, Richard J.; Dolgashev, Valery A.; Laurent, Lisa L.; Lewandowski, James R. et al.
Object Type:
Article
System:
The UNT Digital Library
The Yellow Jacket (Brownwood, Tex.), Vol. 103, No. 3, Ed. 1 Thursday, October 11, 2012
Weekly student newspaper from Howard Payne University in Brownwood, Texas that includes local, state and campus news along with advertising.
Date:
October 11, 2012
Creator:
Howard Payne University
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 120, No. 2, Ed. 1 Wednesday, January 11, 2012
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
January 11, 2012
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 120, No. 15, Ed. 1 Wednesday, April 11, 2012
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
April 11, 2012
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 120, No. 28, Ed. 1 Wednesday, July 11, 2012
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
July 11, 2012
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Yorktown News-View (Yorktown, Tex.), Vol. 120, No. 26, Ed. 1 Wednesday, January 11, 2012
Weekly newspaper from Yorktown, Texas that includes local, state and national news along with advertising.
Date:
January 11, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History