The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

Storage Ring Correction Magnets

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Table 1.3.1.1.4.2-010

Design Specification Parameters for the Strorage Ring Horizontal/Vertical Correction Dipole Magnets

  H-corrector V-corrector
Number 318 318
Magnetic Length 0.16 m .167 m
Peak field @ 7.0 GeV 0.16 T .17 T
Peak bend angle 1.0 mrad 1.2 mrad
Beam stay clear - Horizontal ±35.0 mm ±35.0 mm
- Vertical ±20.0 mm ±20.0 mm
Table 1.3.1.1.4.2-020

Goals and Major Parameters for Storage Ring Horizontal and Vertical Correction Dipole Magnet

Dipole field V H  
Number required 318 318  
Peak field at 7.0 GeV 0.16 .167 T
| DB/B | at ± 3.2 mm 0.08 0.08 %
Physical length 0.14 0.14 m
Effective length 0.16 0.17 m
Gap height 98 85 mm
Conductor - Height 5.1 4.7 mm
- Width 4.8 4.2 mm
Hole diameter 2.6 2.4 mm
Turns/pole (dipole) 128 120  
Inductance 5.9 7.6 mH
Resistance 72 118 mOhms
Time constant 82 64 ms
Peak current 127 124 A
Voltage (DC) 9.2 14.6 V
Water flow 0.3 0.5 gpm
Water pressure drop 80 80 psi
Water temperature rise 17 13 °C
Table 1.3.1.1.4.2-030

Calculated Details of the Design Parameters for the Storage Ring Vertical/Horizontal Correction Magnets at 7.7 GeV
(Vertical Dipole)

Number of magnets 318
Type of magnet Dipole HF
Type of excitation DC
Dipole field strength 0.146 T

DESIGN AND OPERATING PARAMETERS OF A SINGLE MAGNET:

Gap      
  Gap axis shape Straight  
  Effective length of field along gap axis 16.0 cm
  Total width of pole 3.2 cm
  Total gap height 9.8 cm
Core      
  Distance from - Field edge to - Core end 4.49 cm
  - Pole side 16.2 cm
  Overall core - Length (Magnetic steel ONLY) 7.01 cm

Coil

      
  Conductor material Copper  
  Conductor - Height .508 cm
  - Width .478 cm
  - Hole diameter .264 cm
  - Corner radius .08 cm
  Conductor min. bend radius (inside edge)    
  - Width 1.27 cm
  Insulation - Tape - Thickness - Turn .0097 cm
  - Ground .018 cm
  - Width - Turn 2.5 cm
  - Ground 2.5 cm
  Insulation total thickness - Turn .019 cm
  - Ground .107 cm
  Allowance between layers of conductor .025 cm
  Allowance between rows of conductor .025 cm
  Aberage turn length 27.7 cm
  Ampere-turns per pole 16212 At
  Number of layers of conductors per pole 32  
  Number of conductor per layer per pole 4  
  Effective number of turns per magnet 256  
  Number of turns per cooling circuit 128  
  Number parallel connected conductors per magnet 1  

Electrical

      
  Stored energy 47.4 J
  Total inductance 5.9 mH
  Total coil resistance 72.4 mOhms
  Supply current 127 A
  Voltage across magnet 9.2 V
  Overall magnet - Length 14.15 cm

OPERATING PARAMETERS OF THE MAGNET SYSTEM:

Cooling circuit    
Coolant supply temperature 32 °C
Coolant temperature gradient 16.7 °C
Pressure gradient 80 psi
Coolant flow 84.6 gpm
Power losses    
Electrical losses in magnets 369 kW
Electrical pwer to operate coolant pumps 4.2 kW

SOME AUXILIARY PARAMETERS FOR THIS DESIGN ARE:

Cross-sectional area of conductor .183 cm2
Current density in conductor 693 A/cm2
Current density in coil 373 A/cm2
Reynold's number 6135  
Coolant flow velocity 153 cm/s
Maximum conductor temperature 49.1 °C
Table 1.3.1.1.4.2-040

Calculated Details of the Design Parameters for the Storage Ring Vertical/Horizontal Correction Magnets at 7.7 GeV (Horizontal Dipole)

Number of magnets 318
Type of magnet Dipole HF
Type of excitation DC
Dipole field strength 0.1686 T

DESIGN AND OPERATING PARAMETERS OF A SINGLE MAGNET:

Gap      
  Gap axis shape Straight  
  Effective length of field along gap axis 16.7 cm
  Total width of pole 5.39 cm
  Total gap height 8.49 cm
Core      
  Distance from - Field edge to - Core end 4.83 cm
  Overall core - Length (Magnetic steel ONLY) 7.01 cm

Coil

      
  Conductor material Copper  
  Conductor - Height .467 cm
  - Width .419 cm
  - Hole diameter .241 cm
  - Corner radius .08 cm
  Conductor min. bend radius (inside edge)    
  - Width 2.4 cm
  Insulation - Tape - Thickness - Turn .0095 cm
  - Ground .038 cm
  - Width - Turn 2.5 cm
  - Ground 2.5 cm
  Insulation total thickness - Turn .019 cm
  - Ground .107 cm
  Allowance between layers of conductor .025 cm
  Allowance between rows of conductor .025 cm
  Aberage turn length 38.5 cm
  Ampere-turns per pole 14822 At
  Number of layers of conductors per pole 36  
  Number of conductor per layer per pole 4  
  Effective number of turns per magnet 240  
  Number of turns per cooling circuit 60  
  Number parallel connected conductors per magnet 1  

Electrical

      
  Stored energy 58.2 J
  Total inductance 7.6 mH
  Total coil resistance 118 mOhms
  Supply current 124 A
  Voltage across magnet 14.6 V
  Overall magnet - Length 14.15 cm

OPERATING PARAMETERS OF THE MAGNET SYSTEM:

Cooling circuit    
Coolant supply temperature 32 °C
Coolant temperature gradient 13.0 °C
Pressure gradient 80 psi
Coolant flow 168 gpm
Power losses    
Electrical losses in magnets 572 kW
Electrical pwer to operate coolant pumps 8.3 kW

SOME AUXILIARY PARAMETERS FOR THIS DESIGN ARE:

Cross-sectional area of conductor .145 cm2
Current density in conductor 851 A/cm2
Current density in coil 435 A/cm2
Reynold's number 6423  
Coolant flow velocity 182 cm/s
Maximum conductor temperature 45.2 °C