Mechanical Design of a Nb3Sn Superconducting Magnet System for a 45 GHz ECR Ion Source

Juchno, M.; Hafalia, A.R.; Wang, Lu; Ravaioli, Emmanuele; Sabbi, G.; Sun, Liangting; Wu, Wei; Xie, D. Z.; Zhao, Hongwei; Zhu, Li

doi:10.1109/tasc.2017.2773832

Cited by 26 publications

(13 citation statements)

References 8 publications

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“…The FECR magnet was designed by collaboration with LBNL-ATAP. 29,30 The conventional magnet structure with sextupole-inside-solenoids is utilized. The axial mirror magnetic field is produced by four solenoids.…”

Section: B Design Of Fecr Nb 3 Sn Magnetmentioning

confidence: 99%

“…The magnet support structure is based on an aluminum shell surrounding the coils and iron yoke, pretensioned using water-pressurized bladders and interference keys. 29 The aluminum shell supports the sextupole through longitudinally segmented loading pads placed in between solenoids, and a thin continuous collar placed above the coil. The solenoids are encased in a stainless steel form and radially supported by a tensioned aluminum wire, with the aluminum shell providing additional support and alignment through a second set of loading pads interleaved with the first set.…”

Section: B Design Of Fecr Nb 3 Sn Magnetmentioning

confidence: 99%

“…The solenoids are encased in a stainless steel form and radially supported by a tensioned aluminum wire, with the aluminum shell providing additional support and alignment through a second set of loading pads interleaved with the first set. 29 Axial support is provided to both sextupole and solenoid subassemblies by aluminum rods and end plates. The designed magnet mechanical-structure and main subassemblies are shown in Figs.…”

Section: B Design Of Fecr Nb 3 Sn Magnetmentioning

confidence: 99%

“…These collars have optimized cross section that improves their rigidity and allows for more even distribution of the pre-load force transferred from the cylinder by spaced loading pads. 29 All coils of the magnet system are wound with the same Nb 3 Sn round single wire. The Nb 3 Sn wire diameter is 1.3 mm with additional insulation thickness 0.065 mm, and the critical current density is 2.4 kA/mm 2 at temperature 4.2 K and field 12 T. The parameters of the coil system are summarized in Table III.…”

Section: B Design Of Fecr Nb 3 Sn Magnetmentioning

confidence: 99%

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Superconducting ECR ion source: From 24-28 GHz SECRAL to 45 GHz fourth generation ECR

Zhao

Sun

Guo

et al. 2018

Review of Scientific Instruments

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The development of superconducting ECR source with higher magnetic fields and higher microwave frequency is the most straight forward path to achieve higher beam intensity and higher charge state performance. SECRAL, a superconducting third generation ECR ion source, is designed for 24-28 GHz microwave frequency operation with an innovative magnet configuration of sextupole coils located outside the three solenoids. SECRAL at 24 GHz has already produced a number of record beam intensities, such as Ar 1.4 emA, Xe 1.1 emA, Xe 0.36 emA, and Bi 0.68 emA. SECRAL-II, an upgraded version of SECRAL, was built successfully in less than 3 years and has recently been commissioned at full power of a 28 GHz gyrotron and three-frequency heating (28 + 45 + 18 GHz). New record beam intensities for highly charged ion production have been achieved, such as 620 eμA Ar, 15 eμA Ar, 146 eμA Kr, 0.5 eμA Kr, 53 eμA Xe, and 17 eμA Xe. Recent beam test results at SECRAL and SECRAL II have demonstrated that the production of more intense highly charged heavy ion beams needs higher microwave power and higher frequency, as the scaling law predicted. A 45 GHz superconducting ECR ion source FECR (a first fourth generation ECR ion source) is being built at IMP. FECR will be the world's first NbSn superconducting-magnet-based ECR ion source with 6.5 T axial mirror field, 3.5 T sextupole field on the plasma chamber inner wall, and 20 kW at a 45 GHz microwave coupling system. This paper will focus on SECRAL performance studies at 24-28 GHz and technical design of 45 GHz FECR, which demonstrates a technical path for highly charged ion beam production from 24 to 28 GHz SECRAL to 45 GHz FECR.

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Section: B Design Of Fecr Nb 3 Sn Magnetmentioning

confidence: 99%

Section: B Design Of Fecr Nb 3 Sn Magnetmentioning

confidence: 99%

Section: B Design Of Fecr Nb 3 Sn Magnetmentioning

confidence: 99%

Section: B Design Of Fecr Nb 3 Sn Magnetmentioning

confidence: 99%

See 2 more Smart Citations

Superconducting ECR ion source: From 24-28 GHz SECRAL to 45 GHz fourth generation ECR

Zhao

Sun

Guo

et al. 2018

Review of Scientific Instruments

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“…1, includes a 857 mm long sextupole magnet (S), a 30 mm long middle solenoid (M), a 60 mm long extraction solenoid (E), and two 60 mm long injection solenoids (I). All magnets are fabricated with the same Nb 3 Sn round wire and supported by a single mechanical structure [1], [2]. The larger injection solenoid is split into two modules due to mechanical considerations [2], wire piece length availability, and quench protection.…”

Section: Introductionmentioning

confidence: 99%

Quench Protection of a Nb$_3$Sn Superconducting Magnet System for a 45-GHz ECR Ion Source

Ravaioli

Hafalia

Juchno

et al. 2018

IEEE Trans. Appl. Supercond.

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Abstract-Lawrence Berkeley National Laboratory (LBNL) in collaboration with the Institute of Modern Physics (IMP) has developed a Nb3Sn-based superconducting magnet system for a fourth-generation Electron Cyclotron Resonance (ECR) source, with a goal of achieving the magnetic field required for operating at the microwave frequency of 45 GHz. The magnet system is composed of one sextupole magnet inside three solenoids of different sizes manufactured from Nb3Sn round wire. Given the high stored energy density and relatively low wire copper fraction, the coils are not self-protected in the case of a quench. The study of the transient following a quench is carried out by means of the LEDET (Lumped-Element Dynamic Electro-Thermal) program, which includes a detailed simulation of the inter-filament coupling losses developing in the wire. Non-linear effects occurring in the magnet, such as coupling loss and differential inductance reduction, have a significant impact on protecting these magnets. The resulting baseline quench protection strategy based on four independent energy extraction systems protecting the four magnets meets the quench protection requirements. Furthermore, in order to enhance the redundancy of the quench protection system and reduce the peak voltages to ground, the implementation of a CLIQ (Coupling-Loss Induced Quench) system is considered.

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Nb3Sn六极复合超导磁体测试全过程的实时分布式应变检测: 从组装到励磁

Wang,

Yang,

Guan

et al. 2024

Acta Mech. Sin.

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Mechanical Design of a Nb3Sn Superconducting Magnet System for a 45 GHz ECR Ion Source

Cited by 26 publications

References 8 publications

Superconducting ECR ion source: From 24-28 GHz SECRAL to 45 GHz fourth generation ECR

Superconducting ECR ion source: From 24-28 GHz SECRAL to 45 GHz fourth generation ECR

Quench Protection of a Nb$_3$Sn Superconducting Magnet System for a 45-GHz ECR Ion Source

Nb3Sn六极复合超导磁体测试全过程的实时分布式应变检测: 从组装到励磁

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