The superconducting inflector for the BNL g-2 experiment

Yamamoto, A.; Makida, Y.; Tanaka, Kenichi; Krienen, F.; Roberts, B. L.; Brown, H.; Bunce, G.; Danby, G. T.; G-Perdekamp, M; Hseuh, H. C.; Jia, L. X.; Lee, Y.Y; Mapes, M.; Meng, W.; Morse, W. M.; Pai, C.; Prigl, R.; Sampson, W.; Sandberg, J.; Suenaga, M.; Tallerico, T.; Toldo, F.; Woodle, K.; Green, M.A; Itoh, I.; Otsuka, Hiromi; Saito, Yukinobu; Ozawa, Tadashi C.; Tachiya, Yuichi; Tanaka, Hiroyuki; Großmann, A.; Jungmann, Klaus-Peter; Putlitz, G. zu; Deng, Hui; Dhawan, S.; Hughes, V. W.; Kawall, D.; Pretz, J.; Redin, S. I.; Sichtermann, E. P.; Steinmetz, Andrew

doi:10.1016/s0168-9002(02)01232-9

Cited by 49 publications

(26 citation statements)

References 17 publications

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“…A cylinder of length L=450 mm, inner/outer diameter 41/47.4 mm was constructed from two half cylinders, each consisting of 4 layers of a 0.8 mm thick NbTi/Nb/Cu multilayer sheet [2], [3]. This material was used earlier for the construction of the inflector magnet for the BNL g-2 experiment [4], and to create a magnetic field concentrator [5]. The sheet is the discontinued proprietary product of Nippon Steel Ltd.…”

Section: Methodsmentioning

confidence: 99%

NbTi/Nb/Cu Multilayer Shield for the Superconducting Shield (SuShi) Septum

Barna

Novák

Brunner

et al. 2019

IEEE Trans. Appl. Supercond.

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A passive superconducting shield was proposed earlier to realize a high-field (3-4 T) septum magnet for the Future Circular Collider. This paper presents the experimental results of a potential shield material, a NbTi/Nb/Cu multilayer sheet. A cylindrical shield was constructed from two halves, each consisting of 4 layers with a total thickness of 3.2 mm, and inserted into the bore of a spare LHC dipole corrector magnet (MCBY). At 4.2 K, up to about 3.1 T at the shield's surface only a leakage field of 12.5 mT was measured inside the shield. This can be attributed to the mis-alignment of the two half cylinders, as confirmed by finite element simulations. With a better configuration we estimate the shield's attenuation to be better than 4 × 10 −5 , acceptable for the intended application. Above 3.1 T the field penetrated smoothly. Below that limit no flux jumps were observed even at the highest achievable ramp rate of more than 50 mT/s at the shield's surface. A 'degaussing' cycle was used to eliminate the effects of the field trapped in the thick wall of the shield, which could otherwise distort the homogeneous field pattern at the extracted beam's position. At 1.9 K the shield's performance was superior to that at 4.2 K, but it suffered from flux jumps.

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Section: Methodsmentioning

confidence: 99%

NbTi/Nb/Cu Multilayer Shield for the Superconducting Shield (SuShi) Septum

Barna

Novák

Brunner

et al. 2019

IEEE Trans. Appl. Supercond.

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“…The new magnet should have both inner coil ends open for the muon beam, and an increase in the aperture of the transverse direction. It should be noted that it is very difficult to improve on the clever KEK magnet design which was based on the idea of a truncated double cosine theta dipole [3], confirmed by short prototypes cold tests [7]. Fig.…”

Section: Old Inflectormentioning

confidence: 97%

Conceptual Design of FNAL g-2 Superconducting Inflector Magnet

Kashikhin

Andreev

Barzi

et al. 2015

IEEE Trans. Appl. Supercond.

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The new FNAL g-2 experiment is based on the muon storage ring previously used at BNL. The 1.45-T dipole magnetic field in the storage ring is required to have very high (1 ppm) homogeneity. The muon beam injected into the ring must be transported through the magnet yoke and the main superconducting coil cryostat with minimal distortions. The old inflector magnet shielded the main dipole fringe field inside the muon transport beam pipe with an outer NbTi superconducting screen and did not disturb the field in the area of the circulating beam. Nevertheless, this magnet had coils with closed ends, in which a large fraction of muon beam particles were lost The new magnet is also selfshielded, but the magnet ends are open for beam transport, and it has a larger aperture for beam transport. All of these modifications are very critical for the success of the FNAL g-2 experiment. This paper describes the magnet conceptual design, including the choice of superconductor, and the optimization of the coil geometry.

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“…The E821 experiment used a truncated double cos θ magnet [27] with equal and opposite currents in two concentric magnets and a superconducting shield that reduced the "leaked" magnetic flux from the inflector to a level that induced only a 0.2 ppm systematic on the determination of the B-field. This is the baseline design for the FNAL inflector but three key improvements will also be implemented:…”

Section: Injection/beam-storage Improvementsmentioning

confidence: 99%

The new FNAL muon g-2 experiment

Lancaster¹

2014

Proceedings of International Conference on the Structure and the Interactions of the Photon Including the 20th International Wo

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The most recent measurement of the anomalous magnetic moment of the muon by the BNL E821 experiment differs from the Standard Model prediction by approximately 3.5 standard deviations. This may be indicative of new physics beyond the Standard Model or a statistical fluctuation. In this talk a new experiment, FNAL E989, is described that is seeking to improve on the precision of the BNL measurement by more than a factor of 4 and so resolve this issue. This precision is sufficient to establish evidence for new physics beyond the Standard Model at more than 5 σ should the present anomaly be confirmed.

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The superconducting inflector for the BNL g-2 experiment

Cited by 49 publications

References 17 publications

NbTi/Nb/Cu Multilayer Shield for the Superconducting Shield (SuShi) Septum

NbTi/Nb/Cu Multilayer Shield for the Superconducting Shield (SuShi) Septum

Conceptual Design of FNAL g-2 Superconducting Inflector Magnet

The new FNAL muon g-2 experiment

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