Versatile Beamline Cryostat for the Cryogenic Current Comparator (CCC) for FAIR

Haider, David; Tympel, Volker; Zakosarenko, V.; Gersem, Herbert De; Golm, J.; Stöhlker, Thomas; Sieber, T.; Stolz, R.; Marsic, Nicolas; Kurian, Febin; Schmelz, M.; Schwickert, Marcus; Müller, Wolfgang; Koettig, T.; Ucar, Furkan

doi:10.18429/jacow-ibic2019-mopp007

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“…A such characteristic can be very well suited when, for instance, simulating the acoustic noise in the helium vessel of a beamline cryostat, which basically consists of a rectangular cavity interrupted by a circular obstacle (e.g. see the cryostat discussed in [29]). Such acoustic noise analyses can become critical, for instance, when designing a cryogenic current comparator (CCC) with a large bore [30].…”

Section: Engineering Test Case: Acoustic Noise In a Three-dimensional...mentioning

confidence: 99%

Transmission operators for the non-overlapping Schwarz method for solving Helmholtz problems in rectangular cavities

Marsic¹,

Geuzaine²,

Gersem³

2022

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In this paper we discuss different transmission operators for the non-overlapping Schwarz method which are suited for solving the time-harmonic Helmholtz equation in cavities (i.e. closed domains which do not feature an outgoing wave condition). Such problems are heavily impacted by back-propagating waves which are often neglected when devising optimized transmission operators for the Schwarz method. This work explores new operators taking into account those back-propagating waves and compares them with wellestablished operators neglecting these contributions. Notably, this paper focuses on the case of rectangular cavities, as the optimal (non-local) transmission operator can be easily determined. Nonetheless, deviations from this ideal geometry are considered as well. In particular, computations of the acoustic noise in a three-dimensional model of the helium vessel of a beamline cryostat with optimized Schwarz schemes are discussed. Those computations show a reduction of 46% in the iteration count, when comparing an operator optimized for cavities with those optimized for unbounded problems.

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Section: Engineering Test Case: Acoustic Noise In a Three-dimensional...mentioning

confidence: 99%