Rotating Cryocooler for Superconducting Motor

Ko, Jong Soo; Jeong, Sangkwon; Kim, Hongseong; Jung, Jaesung; In, Sehwan; Sohn, Myung-Hwan; Kwon, Yong-Hwan

doi:10.1063/1.2202471

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…where σ x , σ y and σ t are the variances of the x, y and t distributions respectively and C(x, βt) is the term that accounts for a possible space-time correlation in the emission process. We note that C contributes to the size with a negative sign: it means that positive x − t correlation decreases the out radius [22,23]. In Fig.…”

Section: Origins Of Femtoscopic Radii Behaviormentioning

confidence: 94%

Signatures of collective flow in high-multiplicityppcollisions

Kisiel

2011

Phys. Rev. C

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A blast-wave parametrization, including a full set of hadronic resonances, is used to model a small system, with total particle multiplicity comparable to the one measured in the high-multiplicity pp collisions at the Large Hadron Collider (LHC). Calculations are preformed for three cases: with negligible, moderate, and strong radial flow on the blast-wave hypersurface. We investigate the effects of flow on inclusive p T spectra as well as on 1D and 3D femtoscopic radii for pions. Special emphasis is put on the role of pions from resonance decays. In particular we show that they magnify the flow effects present in the blast-wave stage and significantly influence the shape of the correlation functions. A specific observable, the R E out /R G side ratio is proposed as a sensitive probe of the collective effects. Model results for the high multiplicity pp collisions, for scenarios with small and large radial flow are compared. Several features of soft particles production in the medium multiplicity pp events at the LHC are identified as sensitive probes of the collective behavior of the medium.

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Section: Origins Of Femtoscopic Radii Behaviormentioning

confidence: 94%

Signatures of collective flow in high-multiplicityppcollisions

Kisiel

2011

Phys. Rev. C

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“…In addition, PT refrigerates can be highly susceptible to orientation (111) where operation with cold end down is a requirement (110). However, a development of Stirling type co-axial PT cryocoolers is encouraging since these are able to be incorporated on-board in rotating equipment (112). Substantial efforts are invested in development of PTR in order to make them more efficient and less costly (111,113).…”

Section: Hts Sm Design Considerationsmentioning

confidence: 99%

Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

192

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We have examined the potential of 10 MW superconducting direct drive generators to enter the European offshore wind power market and estimated that the production of about 1200 superconducting turbines until 2030 would correspond to 10% of the EU offshore market. The expected properties of future offshore turbines of 8 and 10 MW have been determined from an up-scaling of an existing 5 MW turbine and the necessary properties of the superconducting drive train are discussed. We have found that the absence of the gear box is the main benefit and the reduced weight and size is secondary. However, the main challenge of the superconducting direct drive technology is to prove that the reliability is superior to the alternative drive trains based on gearboxes or permanent magnets. A strategy of successive testing of superconducting direct drive trains in real wind turbines of 10 kW, 100 kW, 1 MW and 10 MW is suggested to secure the accumulation of reliability experience. Finally, the quantities of high temperature superconducting tape needed for a 10 kW and an extreme high field 10 MW generator are found to be 7.5 km and 1500 km, respectively. A more realistic estimate is 200–300 km of tape per 10 MW generator and it is concluded that the present production capacity of coated conductors must be increased by a factor of 36 by 2020, resulting in a ten times lower price of the tape in order to reach a realistic price level for the superconducting drive train.

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