Storage Ring Sextupole Magnets

Drawings

Sextupole Magnets Coil Assembly
Sextupole Magnets - AS1, AS2, AS3, BS1, BS2 Magnet Final Assembly

Tables

Table 1.3.1.1.3.1-010

Design Specification Parameters
of the Storage Ring Sextupole Magnet

Sextupoles
   Number 280
   Magnetic length 0.24 m
   Max. gradient 405 T/m2
   Beam stay clear - Horizontal ±35.0 mm
                            - Vertical ±20.0 mm

Table 1.3.1.1.3.1-020

Goals and Major Parameters
for Storage Ring Sextupole Magnet

Number required 280
Strength at 7.0 GeV 405 T/m2
Effective length 0.241 m
Gap height or diameter 98 mm
Total mass of magnet 314* kg
Coils per pole 1
Conductor - Height 7.4 mm
                 - Width 5.0 mm
                 - Hole diameter 3.0 mm
Number of turns per pole 42
Total inductance 28 mH
Total resistance 110 mW
Time constant 254 ms
Peak current 161 A
Current density in coil 3.1 A/mm2
Voltage 17.3 V
Power 2.8 kW
Cooling water circuits per magnet 6
Total water flow 1.3 gpm
Water pressure drop 80 psi
Water temperature rise 9 °C

*Calculated from computer model

Table1.3.1.1.3.1-030

Calculated Details of the Design Parameters
for the Storage Ring Sextupole Magnet at 7.7 GeV
Calculations derived using program MADEST.

Number of magnets 280
Type of magnet Sextupole
Type of excitation DC
Maximum multipole field gradient 445 T/m2

DESIGN AND OPERATING PARAMETERS OF A SINGLE MAGNET:

Gap
Effective length of field along gap axis 24.1 cm
Total width of pol 4.38 cm
Total bore radius 4.9 cm

Core
Distance from - Field edge to  - Core end 1.55 cm
                                              - Pole side -.30 cm
                      - Coil to   - Pole face 3.288 cm
                                      - Pole side -0.8 cm
                                      - Top yoke -.08 cm
                                      - Side yoke .32 cm
                                      - Endplate end 2.22 cm
Pole radius 2.768 cm
Angle of pole 1.82 rad
Angle between pole axis and pole side .052 rad
Maixmum field at pole edge 0.9 T
Maximum field inside yoke 1.36 T
Overall core  - Height 64.8 cm
                     - Width 70.0 cm
                     - Length (Magnetic steel ONLY) 21 cm
Total mass of magnetic core 243* kg
Lamination thickness .15 cm
Lamination stacking method Parallel

Coil
Conductor material Copper
Conductor - Height .742 cm
                 - Width .498 cm
                 - Hole diameter .297 cm
                 - Corner radius .13 cm
Conductor min. bend radius (inside edge)
                 - Height 2.0 cm
                 - Width 1.9 cm
Insulation - Tape - Thickness - Turn .0191 cm
                                             - Ground .0178 cm
                           - Width - Turn 2.5 cm
                                        - Ground 2.5 cm
Insulation total thickness        - Turn .0191 cm
                                            - Ground .107 cm
Allowance between layers of conductor .076 cm
Allowance between rows of conductor .025 cm
Average turn length 66.4 cm
Magnetic efficiency 93.3 %
Ampere-turns per pole 7443 At
Number of layers of conductors per pole 13
Number of conductors per layer per pole 4
Effective number of turns per magnet 252
Number of turns per cooling circuit 42
Number parallel connected conductors per magnet 1
Coil   - Height 11.26 cm
         - Width 2.43 cm
Electrical
       Stored energy 435 J
       Total inductance 28 mH
       Total coil resistance 108 mW
       Maximum supply current 177 A
       Voltage across magnet 19.1 V
       Overall magnet - Height 75.9 cm
                               - Width 71.1 cm
                               - Length 30.5 cm
        Total mass of an assembled magnet 314* kg

OPERATING PARAMETERS OF THE MAGNET SYSTEM:

Cooling circuit
     Coolant supply temperature 32* C
     Coolant temperature gradient 10.4 C
     Pressure gradient 80 psi
     Coolant flow 34.7 gpm
Power losses
     Electrical losses in magnets 949 kW
     Electrical power to operate coolant pumps 17 kW

SOME AUXILIARY PARAMETERS FOR THIS DESIGN ARE:

Inside radius of core 20.6 cm
Cross-sectional area of core 1605* cm2
Cross-sectional area of conductor .29 cm2
Current density in conductor 620 A/cm2
Current density in coil 336 A/cm2
Reynold's number 8005
Coolant flow velocity 188 cm/s
Maximum conductor temperature 42.8 °C

*Calculated from computer model