Cryogenics for the HOMER II-high field magnet-test facility at the Forschungszentrum Karlsruhe

Lahn, H.; Lehmann, Wolfgang; Stamm, Michael; Susser, Mervyn

doi:10.1063/1.1472012

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…We have used the ASE package 50 to perform the NEB calculations and employed SIESTA and TURBOMOLE 51 codes to obtain the necessary forces and energies. In the calculations for the molecular system carried out with TURBOMOLE, the hybrid B3LYP exchange-correlation functional 52,53 and the def2-SVP basis set 54 have been used.…”

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confidence: 99%

Controlling the Conductance of a Graphene–Molecule Nanojunction by Proton Transfer

2017

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The possibility of using single molecule junctions as components of nanoelectronic devices has motivated intensive experimental and theoretical research on the underlying transport mechanism in these systems. In this Letter, we investigate from a theoretical perspective intramolecular proton transfer reactions as a mechanism for controlling the conductance state of graphene-based molecular junctions. Employing a methodology that combines first-principles electronic structure methods with transport approaches, we show that the proton transfer reaction proceeds via a stepwise mechanism, giving rise to several tautomers with different conductance states. The analysis reveals that the relative stability of the tautomers as well as the energy barrier for their interconversion can be controlled by means of an external electrostatic field, which provides a mechanism for switching the nanojunction.

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confidence: 99%

Controlling the Conductance of a Graphene–Molecule Nanojunction by Proton Transfer

2017

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“…Its basic magnet configuration consists of two NbTi sections and three inner sections made of (NbX) 3 Sn with X = Ta, Ti. At a Helium bath temperature of 1.8 K, a magnetic field of 20 T is provided in a large bore of 185 mm [8], [9]. The intention was always to upgrade HOMER II to (at least) 25 T in a bore of (at least) 50 mm for routine high field in house investigations and measurements.…”

Section: Homer Ii-past Efforts To Hts Insert Upgradementioning

confidence: 99%

Achievement of 26.5 T at 1.8 K and 24.0 T at 4.4 K in a Free Bore of 68-mm Diameter: Successful Commissioning of the HOMER II LTS/HTS High-Field Facility Upgrade

Hornung

Decker

Eisele

et al. 2021

IEEE Trans. Appl. Supercond.

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As an upgrade for higher fields, a REBCO hightemperature superconductor (HTS) insert coil with a remarkable cold bore of 68-mm diameter has been constructed with the goal to be routinely operated to attain total fields of 25 T and beyond in HOMER II. HOMER II is the most advanced superconducting high-field facility of the Institute for Technical Physics at the Karlsruhe Institute of Technology. With its basic magnet configuration, consisting of NbTi and (NbX) 3 Sn low-temperature superconductor solenoid sections, HOMER II can generate a magnetic field of 20 T in a large bore of 185-mm diameter at a Helium bath temperature of 1.8 K. The REBCO HTS insert coil was manufactured using the rarely implemented concept of layer winding technology and consists of five nested solenoids. In this article, we report on the design of the insert, its construction, and commissioning as well as related aspects. In the initial operation period, magnetic fields of up to 26.5 T were obtained at 1.8 K and 24.0 T at 4.4 K, respectively, without training steps and quenching or other problems.

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“…To limit the thermal load for the He II magnet bath, a tightly sealing thermal barrier is required for the HOMER plants operated at approximately 1.8 K. For MTA I, which is operated at the He II boundary temperature, T k , a simple convection barrier is sufficient, as the gaps in the region of this barrier contain only He I, whose thermal conductivity is low. Two different types of He II subcoolers were developed and compared in performance tests for subcooling of the magnet baths [126]. Both types have been run successfully for years.…”

Section: Cryostat Techniquesmentioning

confidence: 99%

“…Throughout the cryofacility area, there have been continuous improvements, upgrading, and more and more automation. Very powerful process instrumentation and control systems were set up in cooperation with industry which achieve a high and reliable degree of automation in a variety of different modes of operation [126,135]. Thus, e.g.…”

Section: Cryomeasuring and Cryoprocessing Techniquesmentioning

confidence: 99%

Development of superconducting and cryogenic technology in the Institute for Technical Physics (ITP) of the Research Center Karlsruhe

Goldacker¹,

Heller²,

Hofmann³

et al. 2002

Cryogenics

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Cryogenics for the HOMER II-high field magnet-test facility at the Forschungszentrum Karlsruhe

Cited by 5 publications

References 1 publication

Controlling the Conductance of a Graphene–Molecule Nanojunction by Proton Transfer

Controlling the Conductance of a Graphene–Molecule Nanojunction by Proton Transfer

Achievement of 26.5 T at 1.8 K and 24.0 T at 4.4 K in a Free Bore of 68-mm Diameter: Successful Commissioning of the HOMER II LTS/HTS High-Field Facility Upgrade

Development of superconducting and cryogenic technology in the Institute for Technical Physics (ITP) of the Research Center Karlsruhe

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