Book/Internal Report

PUBDB-2018-04474

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Studies of TTF RF photocathode gun using acoustic sensors

Nelson, J.Extern* ; Ross, M.Extern*

2001

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Please use a persistent id in citations: doi:10.3204/PUBDB-2018-04474

Report No.: SLAC-PUB-9340; TESLA 2001-35

Abstract: The 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.

Keyword(s): electron positron: linear collider ; linear collider: proposed ; electron: particle source ; RF system: particle source ; photoelectron ; electric field: upper limit ; DESY TESLA Linac

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Contributing Institute(s):

1. Koordination des XFEL-Beschleunigers (MXL)
2. Stanford Linear Accelerator Center (SLAC)
3. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. TESLA-Test-Facility

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