sc dipole magnet for cbm e.a.matyushevskiy, p.g. akishin, a.v. alfeev, v.s. alfeev, v.v. ivanov,...
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![Page 1: SC dipole magnet for CBM E.A.Matyushevskiy, P.G. Akishin, A.V. Alfeev, V.S. Alfeev, V.V. Ivanov, E.I. Litvinenko, A.I. Malakhov JINR, Dubna CBM Collaboration](https://reader036.vdocument.in/reader036/viewer/2022062517/56649ee85503460f94bf934d/html5/thumbnails/1.jpg)
SC dipole magnet for CBM
E.A.Matyushevskiy, P.G. Akishin, A.V. Alfeev, V.S. Alfeev, V.V. Ivanov,
E.I. Litvinenko, A.I. Malakhov
JINR, Dubna
CBM Collaboration Meeting February 2008
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 2
Outline
• Original specifications• Conceptual design• Cryostat and the excitation windings• Field map calculations• Geant geometry• Further steps
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 3
The original specifications for the magnet
The magnet should provide:
An integral value of the magnetic field along Z-axis
about 1.5-2 T x m.
The maximal value of the magnetic field in a magnet
gap should amount to 2 T.
The working gap acceptance should be within 50º in
height (1.4 m) and 60º in width (1.6 m).
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 4
The conceptual project of the magnet
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 5
3D view of the magnet yoke
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 6
The details of the magnet design
Yoke shape: window frame (consists of top and bottom beams and
lateral racks). The set of three pairs of the top and bottom beams
forms the magnet’s poles. Yoke material: the magnetic steel with low carbon content (Steel
1010). Cryostats for excitation windings position: fixed on the magnet’s
yoke. Cryostat vacuum casing material: stainless steel (12Ch18N10T) Windings shape - ‘Duck nose’ form Winding material - superconducting cable with the cross-section of
7 x 4.5 mm². The cable consists of superconducting wires with
niobium-titanic strings put in a copper matrix. The ratio of the cross-
section of the superconductor area to the copper’s matrix is 1/3; the
ratio of the superconducting wires to the aluminium matrix is 1/12. Magnetic screen covers the winding in the magnet’s outlet to
reduce a field outside of the magnet.
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 7
The conceptual project of the magnet(x-y projection)
Lateral racks: Fill in device
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 8
The conceptual project of the magnet (z-y projection)
3 top beams:
3 bottom beams
Magnetic screen
Connector (vacuum-cryostats adapters)Support
basic
Top winding
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 9
The excitation windings (top winding)
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The conceptual project of the magnet (winding cross-section)
Tubes with circulating liquid helium
Support legs (made fromKevlar)
Copper tubes
Vacuum casing
Heliumvessel
NitricscreenSuperisolation
4.5˚K 70-80˚K 300˚K
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 11
(X-Y) gap of the magnet along the beam
from left to right yoke edges
left screen edge
right screen edge
1.0
7 m
1.4
m
1.6
m
1.6 m
1.1 m 0.77 m0.77 m
last STS station (needs >=1.12m)
from left to right yoke edges
left screen edge
right screen edge
1.0
7 m
1.4
m
1.6
m
1.6 m
1.1 m 0.77 m0.77 m
last STS station (needs >=1.12m)
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 12
(X-Y) gap of the magnet available for the detector replacement
from target from magnet outlet
1.0
7 m
1.4
m
1.6
m
1.6 m
1.1 m 0.77 m0.77 m
last STS station (needs >=1.12m)
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 13
Software used for the field calculation
• TOSCA finite element solver for the analysis of all magnetostatic, electrostatic and current flow problems in 3 dimensions(part of the OPERA 3D Software for electro-magnetic design by Vector Field) http://www.vectorfields.com/content/view/27/50/
• Preliminary field calculations have been performed using RADIA - multiplatform software dedicated to 3D magnetostatics computation, optimized for the design of undulators and wigglers made with permanent magnets, coils and linear/nonlinear soft magnetic materials. http://www.esrf.eu/Accelerators/Groups/InsertionDevices/Software/Radia/DocumentationInterfaced to Mathematica (http://www.wolfram.com/ ) via MathLink.
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 14
Magnet geometry under Opera 3D
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 15
The field map “FieldMuon2”
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 16
|B|(x,y) after the magnet
10 cm after the magnet
screen edge
End of the magnetic screen
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 17
Comparison of |By| (z,y) x=0 and x=100:
MuonMagnet and Muon2a
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 18
Comparison of |B| (z,y) x=0 and x=100:
MuonMagnet and Muon2a
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 19
The Geant geometry created for cbmroot framework
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 20
“magnet_muon2.geo” & “sts_standard.geo”
0.5 m
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 21
Option: Muon2 -> Muon2a
The study: the magnet length along Z axis was decreased to 20 cm
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 22
Comparison of |By| and |B| (z,y) x=0: Muon2 and Muon2a
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 23
By(z) for Muon2 (blue) and Muon2a (green)
Field Integral [Tm] for Muon2 and
Muon2a:
[-50,50]: (2) 1.21699 (2a) 1.09416
[-30,70]: (2) 1.18609 (2a) 1.0205
[-20,80]: (2) 1.13681 (2a) 0.952771
[-10,90]: (2) 1.06949 (2a) 0.871026
[10,110]: (2) 0.896442
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Elena Litvinenko CBM Collaboration Meeting 29 February 2008 24
Conclusion
• The engineering design of the window-frame dipole magnet for CBM on the basis of superconducting winding with indirect cooling is proposed.
• The proposed magnet yoke construction ensures the formation of the magnetic field in the gap which corresponds to CBM requirements.
• The cryostat design with indirect cooling system for windings with using liquid helium and nitric is proposed.
• Weight of the magnet is about 80 tons (the basement is not included ), and the flow rate of helium should be about 7 liters per hour.
• The windings can be produced in Dubna, and the yoke - in Kramatorsk.
• Magnet meets the requirements laid down in the draft, which, however, were slightly overstated for the integral of the field.
• The design of the magnet yoke (and cryostat) allows for a change of certain sizes while maintaining the required angular acceptance and retention integral field at 1 Tm.
• The corresponding field map and the Geant geometry for this magnet were created and can be used under cbmroot framework.