Guenther Rosner DIRACmidterm, GSI Darmstadt, 8/12/06 1 Task 4  PANDA 3 Magnet design and integration of detectors Milestones Status Outlook

Guenther Rosner DIRACmidterm, GSI Darmstadt, 8/12/06 2 Milestones & deliverables Milestones 1)10 th monthSuperconducting solenoid coil material selected.  2)16 th month Magnetic field, raytrace and finite element stress calculations finished for Solenoid and Dipole.  3)16 th month Design of superconducting parts of solenoid and dipole coils, cryostats finished.  4)30 th monthTests of coil and cryostat prototypes for solenoid and dipole finished. 5)33 rd monthConceptual design solenoid and dipole. Deliverable: Technical Design Report

Guenther Rosner DIRACmidterm, GSI Darmstadt, 8/12/06 3 Decoupling of Solenoid and Dipole

Guenther Rosner DIRACmidterm, GSI Darmstadt, 8/12/06 4 Normal conducting clam shell Dipole Rectangular racetrack coils Return yoke  Segmented  Simple geometry (still being optimised re costs) Tracking drift chambers  Design & test  Mechanical engineering Mid-plane iron plate? Budgetary prices: Ansaldo, I: €1.7M Danfysik, DK: €1.6M All requirements fulfilled! (Milestone #2)

Guenther Rosner DIRACmidterm, GSI Darmstadt, 8/12/06 5 Solenoid Crucial requirements  Magnetic field strength B = 2 T at interaction point & inner tracker  B field homogeneity ± 2 % in outer tracker region  Radial Br/B 0 integral ≤ 2 mm in outer tracker region  Magnetic stray field < 1 mT in DIRC readout region

Guenther Rosner DIRACmidterm, GSI Darmstadt, 8/12/06 6 Genoa design Choice: 3 SC coils wound inside a 5083 Al mandrel (cf. BaBar, Aleph)  Rutherford type cable compensated in Al (Milestone #1) Minimum length of iron yoke   Coil axially off-centre w/r yoke  approx. 100 t axial forces Magnetic screening of DIRC PMT‘s (< 1mT)  Thin-walled iron doughnut + 1 correction coil Price tag: €4.6M (budget price Ansaldo, I)  including iron yoke, excluding cryogenics All requirements fulfilled (Milestones #2 and #3)!  B/B ≤ 2%  Bdr/B 0 ≤ 2.2mm

Guenther Rosner DIRACmidterm, GSI Darmstadt, 8/12/06 7 Dubna design Choice: Inner mandrel, 2 coreless coils  NbTi/Cu SC cable takes up hoop stress (Milestone #1)  He bath cooling Longer iron yoke  Coil position more axially symmetric w/r yoke  12 t axial forces Magnetic screening of DIRC PMT‘s (< 1 mT)  Massive iron endcap + 2 correction coils All requirements fulfilled (Milestones #2 and #3)!

Guenther Rosner DIRACmidterm, GSI Darmstadt, 8/12/06 8 Outlook All current Task 4, PANDA 3, milestones reached. No show stoppers anticipated until end of play. International review committee to evaluate Dubna vs. Genoa solenoid design in 2007.