Specification for tagging magnetic spectrometer

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Contents 1 Global Tagging Spectrometer Specification 2 Tagger Dipoles 3 Tagger Dipole Coils 4 Tagger Quadrupole Magnet 5 Tagger Magnet Power Supply

Global Tagging Spectrometer Specification

Main beam momentum	12 GeV/c
Momenum range of analyzed electrons	0.5 to 9 GeV/c
Main beam radius	26.685 m
Main beam bending angle	13.4°
Entrance face angle for the first magnet	5.9°
Magnetic field (full excitation)	15.0000 kG
Pole gap	30 mm

Tagger Dipoles

Length	3.09 m
Width	1.09 m
Height	1.41 m
Weight	38 Mg
Separation between magnets	40 cm
Angle between magnets	0.892°

Tagger Dipole Coils

Total number of ampere turns for each magnet	61560
Copper conductor dimensions	11 x 11 mm2
Copper conductor hollow core	7 mm diameter channel
Conductor configuration of each coil	7 x 12
Current density at nominal field	4.44 A/mm2
Electrical resistance of each coil	0.124
Current in conductor	366.43 A
Voltage drop across 4 coils connected in series	181.7 V
Total power consumption	67 kW
Cooling circuits per coil	7
Total flow rate for 20◦C rise	80 l/min
Water supply pressure drop	2.0 atm
Outside dimension of each coil	92 x 152 mm2
Coil treatment	should be vacuum impregnated

Tagger Quadrupole Magnet

Aperture diameter	30 mm
Magnetic length	400 mm
Max magnetic field gradient	20 T/m
Alignment of magnetic and geometric axes	±0.05 mm

Tagger Magnet Power Supply

Power output	80 kW
Lead voltage	200 V
Current	400 A
Current stability	few parts per million over 48 hours
Options	zero field using a feed-back loop