Cryostat design and development for a superconducting undulator for the APS

Abstract

The Advanced Photon Source (APS) upgrade project at Argonne National Laboratory includes the implementation of superconducting undulator insertion devices. A development program is under way to build, test, and operate a prototype device in the storage ring. We present the overall design concept including superconducting magnet structure, cryocooler-based cooling system, and cryostat as well as a status report on the R&D program. Results of cryocooler performance characterization using a model magnet in a test cryostat are described.

Cryogenic permanent magnet and superconducting undulators

“…The original concept and main engineering solutions for the first APS SCU cryostat came from the experienced team of SC wigglers designers/builders at Budker Institute of Nuclear Physics in Novosibirsk, Russia [22]. The cryogenic system [142] of this cryostat (see Fig. 14) consists of three thermal circuits, each operating at its nominal temperature of approximately 4, 20, and 60 K.…”

Development and operating experience of a 1.1-m-long superconducting undulator at the Advanced Photon Source

“…Below we present the main conceptual points of the SCU1 design. A more detailed description can be found in [12][13][14].…”

“…The SCU1 uses a cryostat that is an improved version of the SCU0 cryostat [13]. Modifications include the addition of optical windows in the cryostat vacuum vessel that allow direct observation and measurement of the cold mass vertical position inside the cryostat.…”

Development and operating experience of a short-period superconducting undulator at the Advanced Photon Source

“…Test results indicated that helium circulation via the predominantly horizontal thermosiphon could be enhanced with an additional heater mounted on a vertical helium return pipe [12]. Provision for such a heater has been implemented in the SCU cryostat design [11].…”