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All figures (15)
Figure 3: (a) Comparison of single wire axial and transverse XRD pattern. (b) Comparison of XRD and neutron diffraction pattern in transverse direction.
Table 5: Comparison between RT and 7 K Nb3Sn (321) and Cu (220) diffraction angles.
Figure 9: Residual Nb3Sn (321) stress in axial, hoop and radial directions in the centre of the four largest 11 T dipole conductor blocks.
Table 2: Average Nb3Sn lattice parameters calculated from the Nb3Sn (321) and Cu (200) d-spacings in radial and hoop directions in the different coil cross sections. The standard deviation is mainly a measure for the d-spacing variation in the analysed volume.
Figure 6: Nb3Sn (321) d-spacing distribution in the pole end segment in radial and hoop directions.
Figure 1: (a) Sketch of ID15A test configuration. (b) 11 T coil slice on the goniometer of the ID15A sample stage.
Table 3: Comparison of neutron diffraction and XRD results of Nb3Sn and Cu lattice parameters in radial and hoop directions in the four largest conductor blocks in the 11 T coil centre. Nb3Sn lattice parameters are calculated from the d-spacing of the (321) reflection. The Cu lattice parameter is calculated from the d-spacing of the (200) reflection (XRD) or the (220) reflection (neutron diffraction). The sample volume probed by XRD is 5×5×3 mm3, and the neutron diffraction nominal gauge volume is 5×5×5 mm3.
Figure 7: (a) Micrograph of the conductor block center. (b) Nb3Sn (321) peak area and (c) radial/hoop Nb3Sn lattice parameter acquired by high resolution scans with 100 µm step size.
Figure 10: Nb3Sn and Cu lattice parameter vs temperature during heating of sample coil 107-1, measurement position P1-radial.
Figure 2: 4 cm-long segment of 11 T short model coil #107 mounted on the Stress-Spec sample stage in axial test configuration. The gauge volume centre positions in radial and hoop position are labelled.
Table 4: Main Nb3Sn (321) and Cu (220) peak fit results and calculated elastic strain in radial, hoop and axial directions at RT.
Figure 8: Residual Nb3Sn (321) strain in axial, hoop and radial directions in the centre of the four largest conductor blocks of the 11 T coil segment.
Table 1: Comparison of the Nb3Sn, Nb and Cu lattice parameters calculated from the ID15A and Stress-Spec diffractograms.
Figure 4: (a) Photograph of the Nb3Sn 11 T dipole coil. (b) Nb3Sn (321) diffraction peak intensity distribution across the same slice with a step size of 500 µm in horizontal and in vertical directions.
Figure 5: Nb3Sn (321) and Cu (200) d-spacing distribution in the centre segment in radial and hoop directions.
Journal Article
•
DOI
•
submitter : Residual strain in the Nb$_3$Sn 11 T dipole magnet coils for HL-LHC
[...]
Christian Scheuerlein
1
,
René Flükiger
1
,
Michael Hofmann
2
,
M Lorentzon
1
,
Friedrich Lackner
1
,
Frederic Savary
1
,
L. Bottura
1
,
M. Di Michiel
- Show less
+4 more
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Institutions (2)
CERN
1
,
Technische Universität München
2
26 Oct 2017
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Superconductor Science and Technology