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000415335 0881_ $$aSLAC-PUB-9340; TESLA Report 2001-35
000415335 1001_ $$0P:(DE-H253)PIP1024703$$aNelson, Janice$$b0
000415335 245__ $$aStudies of TTF RF photocathode gun using acoustic sensors
000415335 260__ $$c2001
000415335 300__ $$a9
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000415335 520__ $$aThe arc that occurs during RF breakdown is known to cause local heating of a copper cavity surface, with temperatures sometimes exceeding the melting point. Thermally generated acoustic shock waves [1,2] that accompany breakdowns can be easily detected on the surface of the cavity using externally mounted sensors. Acoustic emission sensors [3] have been used at the TESLA Test Facility to find RF high voltage breakdown locations in the photocathode gun system. It is not known if the acoustic signal emitted from the source (cathode) of the arc is stronger than that emitted from its terminus. The start time and root mean square amplitude of the signal from each of several sensors can be used to locate and classify the breakdown event. We report here on the use of eight sensors mounted on the TTF RF gun [4] to locate its breakdown events during operation with a pulse length of 300$μ$s and a pulse amplitude up to 35 MeV/m. 
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000415335 650_7 $$2INSPIRE$$aelectron positron: linear collider
000415335 650_7 $$2INSPIRE$$alinear collider: proposed
000415335 650_7 $$2INSPIRE$$aelectron: particle source
000415335 650_7 $$2INSPIRE$$aRF system: particle source
000415335 650_7 $$2INSPIRE$$aphotoelectron
000415335 650_7 $$2INSPIRE$$aelectric field: upper limit
000415335 650_7 $$2INSPIRE$$aDESY TESLA Linac
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000415335 7001_ $$0P:(DE-H253)PIP1013916$$aRoss, M.$$b1
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