The Astro-H high temperature superconductor lead assemblies

Canavan, Edgar R.; James, Bryan L.; Hait, T.; Oliver, Anthony W.; Sullivan, Dan

doi:10.1016/j.cryogenics.2014.06.003

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…Finally, high-temperature superconductor (HTS) leads will deliver the current required for each stage's superconducting magnet similar in implementation to Hitomi. 12 The purpose of the HTS is to provide thermal isolation from the higher temperature stage of the cryocooler (e.g., 50 K) to the 4 K stage. This concept has flight heritage through prior flight missions.…”

Section: Exported Vibration Nonementioning

confidence: 99%

Compact and efficient continuous adiabatic demagnetization refrigerator for line emission mapper

Jahromi,

Shirron

2023

J. Astron. Telesc. Instrum. Syst.

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.The continuous adiabatic demagnetization refrigerator (CADR) described in this paper is a compact, reliable, and highly efficient magnetic cooling system designed for the line emission mapper (LEM), a future x-ray probe mission currently being proposed. Operating at two distinct temperatures of 350 mK (T1) and 40 mK (T0), the CADR offers continuous cooling while efficiently rejecting heat to a cryocooler at 4 K. Shielded by ferromagnetic and high-permeability magnetic shields, the CADR minimizes interference on the focal plane assembly. With flight-proven components, the CADR provides precise temperature regulation via its sensitive and large-arrayed transition edge sensor detectors. The CADR system for LEM consists of two modular units. The high-temperature module spans from 4 K to 350 mK, comprising four stages, whereas the low-temperature module spans from 350 to 40 mK, comprising three stages. The system is designed to continuously deliver 174 μW of useful cooling power at 350 mK and 2 μW at 40 mK.

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Section: Exported Vibration Nonementioning

confidence: 99%

Compact and efficient continuous adiabatic demagnetization refrigerator for line emission mapper

Jahromi,

Shirron

2023

J. Astron. Telesc. Instrum. Syst.

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“…Below the 50 K stage, the Wiedemann–Franz law can be circumvented with high-temperature superconductors, greatly reducing the harness heat load on cryocooler stages 3 (18 K) and 4 (4 K). The LEM HTS lead assembly will be similar in many respect to those used in the SXS/Hitomi and Resolve/XRISM instruments 8 . Narrow REBCO tapes will span regions of temperature difference.…”

Section: Requirements and Accommodationsmentioning

confidence: 99%

“…The LEM HTS lead assembly will be similar in many respect to those used in the SXS/ Hitomi and Resolve/XRISM instruments. 8 Narrow REBCO tapes will span regions of temperature difference. In this region, the tapes will be supported and protected by tubes on a carbon fiber composite board.…”

Section: Harnessingmentioning

confidence: 99%

Line emission mapper cryogenic system design

Osborne,

Olson,

Jacoby

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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The line emission mapper x-ray microcalorimeter instrument requires a 4 K cryogenic system to precool a continuous adiabatic demagnetization refrigerator enabling high-resolution x-ray spectroscopy. The cryogenic system described in this work provides the required structural and thermal environments using mature cooling and structural technologies. The system is comprised of a dewar design based on heritage manufacturing processes and an efficient four-stage pulse tube cryocooler with supporting control electronics.

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“…This allows tight control of temperature and temperature rates. The inherently three-dimensional shape of the HTS lead assemblies (see reference [2]) precluded the use of a standard oven, but an oven-based process was developed in attempt to maintain strict control over process parameters. For the test boards, foil heaters mounted directly to bottom applied heat.…”

Section: Sample Preparationmentioning

confidence: 99%

“…To meet these requirements, a set of High Temperature Superconductor (HTS) lead assemblies were designed, built, tested for flight, and delivered to the project [2]. The assemblies used commercial 2G REBCO coated conductor.…”

Section: Introductionmentioning

confidence: 99%

Conductance Degradation in HTS Coated Conductor Solder Joints

Canavan

Leidecker

Panashchenko

2015

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

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Abstract. Solder joints between YBCO coated conductors and normal metal traces have been analysed as part of an effort to develop a robust HTS lead assembly for a spaceflight mission. Measurements included critical current and current transfer profiles. X-ray micrographs were used to verify proper solder flow and to determine the extent of voiding. SEM of crosssections with EDS analysis was crucial in understanding the diffusion of the protective silver layer over the YBCO into the solder for different solder processes. The assembly must be stored for an extended period of time prior to final cool-down and operation. Measurements of the joint resistance over the course of months show a significant increase with time. Understanding the interface condition suggests an explanation for the change.

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The Astro-H high temperature superconductor lead assemblies

Cited by 6 publications

References 14 publications

Compact and efficient continuous adiabatic demagnetization refrigerator for line emission mapper

Compact and efficient continuous adiabatic demagnetization refrigerator for line emission mapper

Line emission mapper cryogenic system design

Conductance Degradation in HTS Coated Conductor Solder Joints

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