Project X superconducting spoke resonator test cryostat 2 K conversion

Chen, M.; Dalesandro, Andrew; Hansen, Benjamin; Klebaner, Arkadiy; Nicol, T.H.; Orlov, Yuriy; Peterson, T.

doi:10.1063/1.4860784

Cited by 2 publications

(2 citation statements)

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“…The techniques of measuring and correcting for these systematic errors are illustrated using data recorded from a 325 MHz single spoke resonator [4,5] installed in the Fermilab STC [6] operating at 2K with and a nominal gradient of 5 MV/m. The RF circuit was modified by installing a trombone between the directional coupler and the cavity.…”

Section: Measurement Techniquementioning

confidence: 99%

Improved RF measurements of SRF cavity quality factors

Holzbauer

Contreras²,

Pischalnikov

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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SRF cavity quality factors can be accurately measured using RF-power based techniques only when the cavity is very close to critically coupled. This limitation is from systematic errors driven by non-ideal RF components. When the cavity is not close to critically coupled, these systematic effects limit the accuracy of the measurements. The combination of the complex base-band envelopes of the cavity RF signals in combination with a trombone in the circuit allow the relative calibration of the RF signals to be extracted from the data and systematic effects to be characterized and suppressed. The improved calibration allows accurate measurements to be made over a much wider range of couplings. Demonstration of these techniques during testing of a single-spoke resonator with a coupling factor of near 7 will be presented, along with recommendations for application of these techniques.

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Section: Measurement Techniquementioning

confidence: 99%

Improved RF measurements of SRF cavity quality factors

Holzbauer

Contreras²,

Pischalnikov

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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show abstract

“…We can see below a picture of the existing test station. The main cryogenic components are located just above the test station [3]. The test station consists of the following main components, which can also be seen figure 2 [3]:…”

Section: The Existing Test Stationmentioning

confidence: 99%

Upgrade of the spoke test cavity station

Roger

Nicol

Ozelis

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.Originally the spoke test cavity cryostat was designed to test exclusively SSR1 cavities. The goal of this upgrade is to extend this capability to SSR2 cavities, and to the low and high beta 650 MHz cavities. These cavities are the last elements of the superconducting linac architecture which is the main component of the Proton Improvement Plan-II (PIP-II) at Fermilab. The size of SSR2 and 650 MHz cavities being much bigger than SSR1, extensions of the vacuum vessel and of all the cryogenic lines have been necessary. Mechanical, thermal and cryogenic analyses have been performed to ensure proper operation. This paper summarizes the design choices which have been made by describing the main elements of this upgrade and the interface between cryogenic lines and cavities.

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Project X superconducting spoke resonator test cryostat 2 K conversion

Cited by 2 publications

References 0 publications

Improved RF measurements of SRF cavity quality factors

Improved RF measurements of SRF cavity quality factors

Upgrade of the spoke test cavity station

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