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Solenoid Overview

To provide a magnetic field of 2T over a length of about 4m and a diameter of 1.9m and to simultaneously keep this region free for detectors is far from trivial. The technological challenge is potentiated by additional requirements concerning field homogeneity (see table below), the intersection of a warm target feed pipe and detector access, to name only a few.

We have designed the PANDA solenoid magnet using a superconducting split coil with Rutherford type cable and indirect cooling. Though the detector layout requires an asymmetric arrangement of the cryostat and flux return yoke, the axial magnetic forces could be balanced to below 10% in this design. The cryostat surrounds all detectors and serves as their mounting structure. The flux-return yoke acts as a muon range system by incorporating mini-drift tubes between 13 layers of iron. Both ends of the return yoke will be fabricated as opening doors, in parts simultaneously serving as muon range system. In addition, the whole set up of more than 300t will be retractable to a parking position well outside the beam, where it can be operated for commissioning and maintenance.

The main parameters are summarised in the table below.

Item Value
Central field 2.0 T
Fiel homogeneity ≤2%
Norm. radial field integral ≤2 mm
Inner bore 1.9 m
Cold mass parameters
Length 2.7 m
Energy 20 MJ
Current 5000 A
Weight 4.5 t
Cable cross section 3.4 × 2 mm2
Current density 59 A/mm2
Yoke parameters
Length 4.9 m
Outer radius 2.30 m
Iron layers 13
Total weight 300 t

The field becomes ineffective for the very forward going particles. This is covered by the dipole, see dipole description.


View of the solenoid (1/4 cut for visibility)
View of the solenoid from the upstream side (1/4 cut off for visibility). Grey: cryostat, inner red parts: coils, blue: flux return yoke, red bars: support structure.

View of cryostat, coil and turret
View of coil, cryostat and crogenic turret (1/2 cut off for visibility). Green: coil former, brown: coils, red and black: supporting structures and cooling line, grey: outer housing of cryostat and turret.

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Topic attachments
I Attachment Action Size Date Who Comment
CryoView-suspended_Renzo0906_01_small.pngpng CryoView-suspended_Renzo0906_01_small.png manage 88.0 K 20 Oct 2009 - 16:04 IntiLehmann Schematic view of coil and cryostat highlighting suspensions
Panda_coil_cryostat_small.pngpng Panda_coil_cryostat_small.png manage 73.6 K 16 Nov 2009 - 15:20 IntiLehmann View of cryostat, coil and turret
Solenoid_3D_upstream_small.pngpng Solenoid_3D_upstream_small.png manage 83.8 K 20 Oct 2009 - 16:10 IntiLehmann View of the solenoid (1/4 cut for visibility)
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Topic revision: r5 - 16 Nov 2009, IntiLehmann
 
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