A Magnetic Detector for MINERvA

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A Magnetic Detector for MINERvA

• Modular Structure
• Fe Torroids, strong Toroidal Magnetic Field
• Scintillator strips
• WLS fiber readout with Hamamatsu M64
• MINOS ND Electronics
• Momentum Measurements
• Monte Carlo

MINERVA Collaboation meeting, August 22-24, 2003
G. Tzanakos, University of Athens
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BASIC TOROIDAL MODULE
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Example (Cont)

• Thin Fe down to 2 mm. Doable (J. Nelson).
• Assume d 4 mm ( ? X0/4)
• Strips 3 cm x 1cm x 300 cm
• Target mass 3.0 ton ( 1.5 m dia x 2 m)
• Toroid D 3 m
• 256 planes, 100 strips gt 96 trips gt 24576
  strips
• 384 M64s
• Fe 200 kg/plane gt ? 50 ton total

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Example (Cont)
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Example (Cont)
Section Target(ton) Magnet(tons) Weight/plan
e (Kg) S1 1.81 7.12
140 S2 1.02 9.62
166 S3 0.45 11.40
185 S4 0 12.82
200 Total 3.28 40.96 Grand
Total 44 tons
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Example (Cont)

• Energy Resolution for showers ?E/E ? 0.2 ?(t/E)
• (from MINOS CalDet ?E/E ? 0.23/?(E))
• Here t 0.4/1.76 gtgt ?E/E ? 10/ ?(E)
• Spatial Resolution/plane ?x ? 1 cm (? 3/
  ?12)
• B 15 KG gt 57 cm path in Fe to tell the sign
  of charge
  ( ?m ? 3?c)

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Momentum Measurements
?(1/P) 8 (?s)/0.3BdFe(dFedsc)N2 ?(1/P)c
(50/BP)A/N1/2 A (dFe/X0Fe)(dsc/X0sc)/dFe2
1/2 ?(1/P) ? 1/N2 ?(1/P)c ? 1/N1/2 Plot vs
N dFe 0.4 cm, dsc 1.75 cm, B 15 KG, Ds
0.5 cm
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In progress

• Monte Carlo from Steve Boyd
• Orthogonal Detector
• Toroidal Magfield B 15 KG
• See what events look like with and without
  Magfield
• Do quantitative studies
• QE events
• Single Pion
• ?0 production
• How systematics get improved?