Single-shot THz Spectrometer for Measurement of RF Breakdown in mm-wave Accelerators
| Autor: | Kutsaev, Sergey, Dal Forno, Massimo, Dolgashev, Valery, Goncharik, Vladimir, Murokh, Alex, Ruelas, Marcos, Savin, Evgeny, To, Hoson |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Scopus-Elsevier |
| DOI: | 10.18429/jacow-ipac2016-mopmr056 |
| Popis: | We present a new instrument designed to detect RF pulse shortening caused by vacuum RF breakdown in mm-wave particle accelerators. RF breakdown limits the performance of high gradient RF accelerators. To understand the properties of these breakdowns, it is necessary to have diagnostics that reliably detect RF breakdowns. In X-band or S-band accelerators, RF breakdowns are detected by measuring RF pulse shortening, vacuum burst, or, if current monitors are available, spikes in the field-emitted currents. In mm-wave accelerators, all of these methods are difficult to use. In our experiments, we could not measure RF pulse shortening directly with a crystal detector because the RF pulse is very short'just a few nanoseconds'and changes in the measured signal were masked by RF amplitude jitter. To overcome this limitation, we built a single-shot spectrometer with a frequency range of 117-125 GHz and a resolution of 0.1 GHz. The spectrometer should be able to measure the widening of the spectrum caused by the shortening of nanosecond-long pulses. We present design considerations, first experimental results obtained at FACET, and planned future improvements for the spectrometer. Proceedings of the 7th Int. Particle Accelerator Conf., IPAC2016, Busan, Korea |
| Databáze: | OpenAIRE |
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