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) 10th month Superconducting solenoid coil material selected.
2) 16th monthMagnetic field, raytrace and finite element stress calculations finished for Solenoid and Dipole.
3) 16th monthDesign of superconducting parts of solenoid and dipole coils, cryostats finished.
4) 30th month Tests of coil and cryostat prototypes for solenoid and dipole finished.
5) 33rd month Conceptual design solenoid and dipole.
Deliverable: Technical Design Report
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: €1.7MDanfysik, 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/B0 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/B0 ≤ 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)!