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