Advanced Photon Source

An Office of Science National User Facility

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