The Tension and Pitch Measurements with Prototypes

Superconducting Solenoid Magnet Zian Zhu BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet The solenoid magnet provides an axial magnetic field of about 1.2 Tesla over the tracking volume

of BESIII,field uniformaty <5%. The magnetic field produced by the coil is returne d by the steel plates of the surrounding Muon det ector. (~12 layers in barrel,space for endcap,prop er aperture of end yoke for SC quadruple) Compositive field with SC quadruple BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Detector Magnet System Cryostat Cryogenics Chimney Control Dewar BESIII Workshop

Coil Power Supply Quench Protection Yoke (Barrel/End) Zian Zhu Field Mapping Beijing, Oct.13,2001 Superconducting Solenoid Magnet Magnet Characteristics Cryostat Inner Radius 1.0 m Outer Radius

1.3 m Total Length 3.4 m Nominal Magnetic Field 1.2 T Cool Down Time < 7 days Quench Recovery Time < 1 day BESIII Workshop

Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Magnetic Field Design The field uniformity and forces on the coil are strongly influenced by the proximity of the iron yoke. We will calculate the field and forces using the ANSYS program. BESIII Workshop B along Z axis (B0=1T, Poisson method)

Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Flux line display (Poisson method) BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Coil Design Super Conductor Support cylinder

Cooling Tube Cryostat Chimney BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Parameters of the Solenoid Coil Cryostat Inner Radius 1.0 m Outer Radius 1.3 m

Length 3.4 m Coil Effective Radius 1.15 m Length 3.0 m Conductor Dimension 3 x 33 mm2 Outer cylinder Thickness 15 mm Center Field

1.2 T Nominal Current 3000 A Inductance 6.12 H Stored energy 9 MJ Stored energy/cold mass(E/M) 6 kJ/kg Charging time 0.5 hour

Effective cold mass 4.3 tons BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet * We can benefit from other successfully soleno id magnets, particular the BELLE coil. * The primary issue regarding conductor fabrica tion is the cross sectional aspect ratio of the co nductor. Co-extruded cable: the superconducting cable is at the center of the aluminum stabilizer. We wil l compare in several conductor options. Here is a conductor BELLE using: 3x33 mm2. * Stability against a quench: Even if the total m agnetic energy were dumped entirely into the c

onductor, the material of the 33 mm thick coil s hould be sufficient to keep the coil temperature below 80 K after a quench at the operating curr ent. Superconductor Cross section BESIII Workshop * The coil consists of a single layer aluminum st abilized superconductor coil wound around and glued on the inner surface of an aluminum supp ort cylinder. * The electric ground insulation between the coi l and the support cylinder must have breakdow n voltage larger than 2kV. Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet

Coil Cross View BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Cryostat Radiation shield Vacuum vessel inner/outer vessel connected by flat annular bulkheads at each end, made by non magnetic metal Cooling:

2 phase force flo w Lhe circulating through th e tube welded on the out er surface of the support cylinder. 2mm thick pure aluminum strips are wound on the inner surface of the coil to increase the propagation velocity of the quench BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Coil Support Sketch map, Detail study is under

investigation BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Chimney The cryogenic lines and the superconducting leads from the coil go through the chimney to the outside of the iron structure. The lines and leads are sur rounded by multi layer thermal shields and the vacuum jacket. The chimney protrudes vertically up ward from one end of the coil. The annu lar space between the thermal shield and the vacuum jacket is occupied by t he flow channels for the pressure relief and vacuum exhaust lines. Pressure relief is needed to protect the vacuum vessel from overpressure in the even t of an accidental leak of cryogens from the cooling line. The relief device an d vacuum pump are located on the top of the detector. A hole of dimension 50x50 cm2 in the iron yoke accommodates the chimney. BESIII Workshop

Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Cryogenics Common cryogenics with mini beta magnet 150W+80W BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Power Supply 3000 A and 10 V Dump resistor needed Protection circuit

Three modes of switching and discharging for the extraction of the electromagnetic stored energy from the magnet. Fast discharge system: quickly switch off the circuit and extract the energy to the dump resistor. This mechanism must work during power failures. Quench protection: It is required to have sufficient redundancy in the fast discharge system and quench detectors for safe quench protection. Slow discharge system: discharge the coil sufficiently slowly so that the eddy current in the coil will not initiate a quench. BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Mechanical Design Force Calculations The radial magnetic

pressure The Hoop stress The force compressive The axial stress The combined stress BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Schedule 2001.10~2002.09: Concept design/Engineering design 2002.07: order conductor

2002.10~2005.02: Coil fabrication, test cryogenics,mapping machine,power supply 2005.03: shipping (2004.06~2004.09): Disa. BESII (2004.10~2005.03):Assembly iron yoke,cryogenics commission (2005.04~2005.06):SC solenoid and quadruple magnet commission (2005.07~2005.08):Field mapping BESIII Workshop Zian Zhu Beijing, Oct.13,2001 Superconducting Solenoid Magnet Need Support from Domestic and Overseas

Concept design Coil/Cryostat fabricate Chimney Power Cryogenics Filed mapping BESIII Workshop Zian Zhu Beijing, Oct.13,2001

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