E. Gregory
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View article: Phase transformations during the reaction heat treatment of Nb<sub>3</sub>Sn superconductors
Phase transformations during the reaction heat treatment of Nb<sub>3</sub>Sn superconductors Open
The evolution of Nb containing phases during the diffusion heat treatment of three different high critical current Nb3Sn strand types is compared, based on synchrotron X-ray diffraction results that have been obtained at the ID15 beam line…
View article: Phase Transformations during the Reaction Heat Treatment
Phase Transformations during the Reaction Heat Treatment Open
The evolution of Nb containing phases during the diffusion heat treatment of three different high critical current Nb$_{3}$Sn strand types is compared, based on synchrotron X-ray diffraction results that have been obtained at the ID15 beam…
View article: Final Report SBIR Phase I, Improvement of Properties of Tubular Internal-Tin Nb3Sn
Final Report SBIR Phase I, Improvement of Properties of Tubular Internal-Tin Nb3Sn Open
Final report of SBIR to develop an economical process that can produce the best material for high field magnets to be used in the next generation of accelerators.
View article: Final report SBIR Phase II. High current density,(Jc), low AC loss, low cost, Internal-Tin Superconductor
Final report SBIR Phase II. High current density,(Jc), low AC loss, low cost, Internal-Tin Superconductor Open
Final report of SBIR to develop an economical process that can produce the best material for high field magnets to be used in the next generation of accelerators
View article: Anomalous low field magnetization in fine filament NbTi conductors
Anomalous low field magnetization in fine filament NbTi conductors Open
The first cable conductors for SSC were made with NbTi filaments whose diameters were in the 18 to 23 micron range. In an effort to reduce the magnetization effects in accelerator dipoles resulting from these large filaments, second genera…
View article: A METHOD TO TWIST SUBDIVIDED HTS COATED CONDUCTORS WITHOUT TWISTING CONDUCTORS—QUASI-TWISTED CONDUCTORS
A METHOD TO TWIST SUBDIVIDED HTS COATED CONDUCTORS WITHOUT TWISTING CONDUCTORS—QUASI-TWISTED CONDUCTORS Open
A method, a quasi‐twisting method, was proposed that the effect of twisting in subdivided HTS coated conductor is obtained without twisting the conductor itself. Superconductor layers on substrates of coated conductors are subdivided into …
View article: PROOF STRENGTH BEHAVIOR OF NB3SN BRONZE ROUTE WIRES BETWEEN 300 AND 4 K
PROOF STRENGTH BEHAVIOR OF NB3SN BRONZE ROUTE WIRES BETWEEN 300 AND 4 K Open
Outer stabilized Nb3Sn bronze route wires were investigated at room temperature, at 7 K and 4 K with respect to their stress versus strain behavior using the recommendations of the draft foreseen for a new tensile measurement IEC standard.…
View article: AC AND IMPULSE BREAKDOWN OF LIQUID NITROGEN AT 77 K FOR QUASI-UNIFORM FIELD GAPS
AC AND IMPULSE BREAKDOWN OF LIQUID NITROGEN AT 77 K FOR QUASI-UNIFORM FIELD GAPS Open
Liquid nitrogen (LN2) is commonly used both as a coolant and electrical insulation in high temperature superconductor (HTS) equipment for power applications. Hence it is necessary to know the electrical breakdown characteristics of LN2 und…
View article: HIGH-PRESSURE OXYGENATION OF MT-YBCO: THE WAY TO REDUCE THE OXYGENATION TIME, TO PREVENT MACROCRACKING, AND TO OBTAIN MATERIALS WITH HIGH CRITICAL CURRENTS.
HIGH-PRESSURE OXYGENATION OF MT-YBCO: THE WAY TO REDUCE THE OXYGENATION TIME, TO PREVENT MACROCRACKING, AND TO OBTAIN MATERIALS WITH HIGH CRITICAL CURRENTS. Open
The oxygenation of MT‐YBCO under isostatic oxygen pressure (up to 16 MPa) at 900‐800 °C allowed reduced process time, lower macrocracking, and reduced microcracks. Additionally higher critical currents, trapped fields and mechanical charac…
View article: NEW INSULATION APPLICATION PROCESS FOR WIND-AND-REACT MAGNET FABRICATION
NEW INSULATION APPLICATION PROCESS FOR WIND-AND-REACT MAGNET FABRICATION Open
Wind‐and‐react processes offer a cost‐effective means of fabricating large‐scale Nb3Sn magnets, while also eliminating the need to manipulate the brittle superconductor after the high‐temperature reaction process. Composite Technology Deve…
View article: INFLUENCE OF MICRO-DAMAGE ON RELIABILITY OF CRYOGENIC BELLOWS IN THE LHC INTERCONNECTIONS
INFLUENCE OF MICRO-DAMAGE ON RELIABILITY OF CRYOGENIC BELLOWS IN THE LHC INTERCONNECTIONS Open
To achieve maximum beam energy in the LHC the accumulated length of the interconnections between LHC main magnets has been limited to around 3% of the total magnetic length in the Arcs and Dispersion Suppressors. Such a low ratio leads to …
View article: LOW TEMPERATURE THERMOELECTRIC PROPERTIES OF Bi-Sb ALLOYS WITH PARTIAL SUBSTITUTION OF Ag OR Zn FOR Sb
LOW TEMPERATURE THERMOELECTRIC PROPERTIES OF Bi-Sb ALLOYS WITH PARTIAL SUBSTITUTION OF Ag OR Zn FOR Sb Open
Bi‐Sb‐Ag and Bi‐Sb‐Zn alloys with the general formula of Bi85Sb15−xAgx(x = 0, 1, 3, 5, 7) and Bi85Sb15−xZnx(x = 1, 3, 5, 7), respectively, were prepared by mechanical alloying and subsequent pressure‐less sintering. The phase structures of…
View article: EFFECT OF RADIUS OF LOADING NOSE AND SUPPORTS IN SHORT BEAM TEST FIXTURE ON FRACTURE MODE AND INTERLAMINAR SHEAR STRENGTH OF GFRP AT 77 K
EFFECT OF RADIUS OF LOADING NOSE AND SUPPORTS IN SHORT BEAM TEST FIXTURE ON FRACTURE MODE AND INTERLAMINAR SHEAR STRENGTH OF GFRP AT 77 K Open
A short beam test is useful to evaluate interlaminar shear strength of glass fiber reinforced plastics, especially for material selection. However, effect of test fixture configuration on interlaminar shear strength has not been clarified.…
View article: FRACTURE TOUGHNESS MEASUREMENTS AND ASSESSMENT OF THIN WALLED CONDUIT ALLOYS IN A CICC APPLICATION
FRACTURE TOUGHNESS MEASUREMENTS AND ASSESSMENT OF THIN WALLED CONDUIT ALLOYS IN A CICC APPLICATION Open
The Series‐Connected Hybrid Magnets under construction at the NHMFL use Cable‐in‐Conduct‐Conductor (CICC) technology. The 4 K mechanical properties of the conduit are extremely important to the performance and reliability of the magnets. W…
View article: THERMAL PROPERTIES OF DOUBLE-ALUMINIZED KAPTON AT LOW TEMPERATURES
THERMAL PROPERTIES OF DOUBLE-ALUMINIZED KAPTON AT LOW TEMPERATURES Open
Double-aluminized kapton (DAK) is commonly used in multi-layer insulation blankets in cryogenic systems. NASA plans to use individual DAK sheets in lightweight deployable shields for satellites carrying instruments. A set of these shields …
View article: Ag-SHEATHED Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8] SQUARE WIRE INSULATED WITH OXIDIZED HASTELLOY FIBER BRAID
Ag-SHEATHED Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8] SQUARE WIRE INSULATED WITH OXIDIZED HASTELLOY FIBER BRAID Open
Oxidized Hastelloy X (Hx) fiber braid has been demonstrated to work well as a good electric insulation of Ag‐sheathed Bi2Sr2CaCu2O8 (Ag/Bi2212) wires. In order to develop a wind‐and‐react processed Ag/Bi2212 superconducting magnet with a h…
View article: INTERFACE ROUGHNESS IN COPPER-TANTALUM WIRE AND NB[sub 3]SN SUPERCONDUCTOR COMPOSITES
INTERFACE ROUGHNESS IN COPPER-TANTALUM WIRE AND NB[sub 3]SN SUPERCONDUCTOR COMPOSITES Open
Poor deformation behavior of tantalum (Ta) sheet used for tin diffusion barriers in Nb3Sn composite superconductors can lead to Ta layer rupture and even strand fracture during wire drawing. These problems arise because the Ta layer deform…
View article: MEASUREMENTS OF RRR VARIATION IN STRANDS EXTRACTED FROM Nb[sub 3]Sn-TYPE RUTHERFORD CABLES
MEASUREMENTS OF RRR VARIATION IN STRANDS EXTRACTED FROM Nb[sub 3]Sn-TYPE RUTHERFORD CABLES Open
Modern high‐Jc Nb3Sn strands and cables for use in high field accelerator magnets suffer from flux jump‐related instabilities at low magnetic fields. These instabilities are determined by the values of Jc, deff, and RRR. It has been postul…
View article: TESTS OF INSULATION SYSTEMS FOR Nb3SN WIND AND REACT COILS
TESTS OF INSULATION SYSTEMS FOR Nb3SN WIND AND REACT COILS Open
Tests were performed to assess the viability of several cable insulation systems for use in Nb3Sn accelerator magnets. Insulated stacks of cables were subjected to reaction cycles commonly used for Nb3Sn coils. After reaction and epoxy imp…
View article: NB[sub 3]SN AND NbTi MULTIFILAMENTARY WIRES WITH ENHANCED HEAT CAPACITY
NB[sub 3]SN AND NbTi MULTIFILAMENTARY WIRES WITH ENHANCED HEAT CAPACITY Open
ITER type multifilamentary superconducting wires (0.82 mm Nb3Sn wire and 0.73 mm NbTi wire) with high heat capacity at LHe temperatures have been manufactured and tested. To increase the heat capacity the corresponding billets were doped w…
View article: BSCCO-2212 WIRE AND CABLE STUDIES
BSCCO-2212 WIRE AND CABLE STUDIES Open
BSCCO‐2212 round wires are being studied at Fermilab for possible use in accelerator magnets. Several billets were produced by OST with various fill factors in a diameter range between 0.7 mm and 1 mm. To allow for cabling the strands, a m…
View article: THERMAL-MECHANICAL RESPONSE OF CRACKED SATIN WEAVE CFRP COMPOSITES AT CRYOGENIC TEMPERATURES
THERMAL-MECHANICAL RESPONSE OF CRACKED SATIN WEAVE CFRP COMPOSITES AT CRYOGENIC TEMPERATURES Open
This paper examines the thermal‐mechanical response of satin weave carbon fiber reinforced polymer (CFRP) laminates with internal and/or edge cracks subjected to uniaxial tension load at cryogenic temperatures. Cracks are considered to occ…
View article: CHANGES IN MICROSTRUCTURE AND TRANSPORT PROPERTIES OF MAGNESIUM DIBORIDE STRANDS THROUGH HOT UNIAXIAL PRESSING
CHANGES IN MICROSTRUCTURE AND TRANSPORT PROPERTIES OF MAGNESIUM DIBORIDE STRANDS THROUGH HOT UNIAXIAL PRESSING Open
In attempts to increase density and improve connectivity, powder‐in‐tube MgB2 monofilamentary strands were prepared and then subjected to various pressure schedules. The strands were subjected to cold deformation processes such as cold uni…
View article: HOT EXTRUSION OF EX-SITU MgB[sub 2] POWDER
HOT EXTRUSION OF EX-SITU MgB[sub 2] POWDER Open
We investigated the fabrication of ex‐situ processed MgB2 round wire by hot extrusion. Composite ex‐situ MgB2 monocore billets were fabricated with a composite sheath consisting of either an AISI 304 or AISI 430 stainless steel clad with c…
View article: IMPROVED MAGNETIC FLUX PINNING IN BULK (RE)BCO SUPERCONDUCTORS
IMPROVED MAGNETIC FLUX PINNING IN BULK (RE)BCO SUPERCONDUCTORS Open
(RE)‐Ba‐Cu‐O bulk superconductors containing non‐superconducting phase inclusions of compositions RE2Ba4CuMOy [M = W, Nb, Ag and Bi] and RE2BaCuO5 embedded in the REBa2Cu3O7−δ (RE‐123) superconducting matrix have been fabricated successful…
View article: INTERNAL TIN Nb[sub 3]Sn CONDUCTORS FOR PARTICLE ACCELERATOR AND FUSION APPLICATIONS
INTERNAL TIN Nb[sub 3]Sn CONDUCTORS FOR PARTICLE ACCELERATOR AND FUSION APPLICATIONS Open
The past several years have seen a significant improvement in the maximum critical current density (Jc) in Nb3Sn strand. However for many applications, parameters besides high Jc values are paramount. For fusion applications such as ITER, …
View article: THE 4K MECHANICAL PROPERTIES OF MODIFIED SS316LN FOR JACKET MATERIALS IN SUPERCONDUCTING FUSION MAGNETS
THE 4K MECHANICAL PROPERTIES OF MODIFIED SS316LN FOR JACKET MATERIALS IN SUPERCONDUCTING FUSION MAGNETS Open
Modified stainless steel 316LN (SS316LN) is designed as ITER TF jacket materials for the application at 4K. The mechanical properties of modified SS316LN have been measured at both room temperature and 4K in order to evaluate its suitabili…
View article: PHASE DIAGRAM CALCULATION AND EXPERIMENT FOR FE-MN-AL SYSTEM AT DIFFERENT TEMPERATURE
PHASE DIAGRAM CALCULATION AND EXPERIMENT FOR FE-MN-AL SYSTEM AT DIFFERENT TEMPERATURE Open
The phase equilibrium of the Fe‐Mn‐Al ternary system plays an important role in development of cryogenic alloys and heat‐resistant steels. In the present work, the isothermal sections of Fe‐Mn‐Al system were calculated at different tempera…
View article: PREPARATION AND CHARACTERIZATION OF MgB[sub 2] BULK SAMPLES USING HIGH-ENERGY BALL MILLING AND HOT ISOSTATIC PRESSING
PREPARATION AND CHARACTERIZATION OF MgB[sub 2] BULK SAMPLES USING HIGH-ENERGY BALL MILLING AND HOT ISOSTATIC PRESSING Open
MgB2 bulk samples were prepared using high‐energy ball milling in nitrogen atmosphere followed by cold isostatic pressing and hot isostatic pressing to increase densification and grain connectivity. Higher values of critical current densit…
View article: MODELING OF HTS APPLICATIONS USING EMTP WITH FLUX-PINNING SCALING MODELS FOR PRACTICAL HTS SUPERCONDUCTORS
MODELING OF HTS APPLICATIONS USING EMTP WITH FLUX-PINNING SCALING MODELS FOR PRACTICAL HTS SUPERCONDUCTORS Open
The EMTP software (Electromagnetic Transient Program) for modeling the behavior of electric power systems is commonly used to obtain the transient response of system disturbances, for example caused by fault currents. We have developed spe…