1. A Magnetic Detector for MINERvA G. Tzanakos, University of Athens Modular Structure Fe Torroids, strong Toroidal Magnetic Field Scintillator strips WLS fiber readout with Hamamatsu M64 MINOS ND Electronics MINERVA Collaboation meeting, June 27-28, 2003

2. DETECTOR CONCEPT Fe Scintillator

3. BASIC TOROIDAL MODULE Fe Sci Strips u v

4. Toroidal Magnetic Detector (Type A)

5. Toroidal Magnetic Detector (Type B)

6. Example

7. Example of type A

8. Example (Cont) Thin Fe : down to 2 mm. Doable (J. Nelson). Assume d = 4 mm (  X 0 /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 => 96 trips => 24576 strips  384 M64s  Fe 200 kg/plane =>  50 ton total

9. S1 S2 S3 S4 2.0 m 1.51.03.0 m 6.4 m 64 64 64 64 Planes Example (Cont)

10. Section Target(ton) Magnet(tons)Weight/plane (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

11. 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 ===>>  E/E  10%/  (E) Spatial Resolution/plane  x  1 cm (  3/  12) B = 15 KG => 57 cm path in Fe to tell the sign of charge ( m  3 c )

12. Next Steps Model in GEANT Generate neutrino events, study characteristics of QE, SP,  0 production, DIS Event Display could be very instructive. Study spatial resolution. Study virtues of this magnetic detector vs no field Get a realistic conceptual design Get costs