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 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: €1.7MDanfysik, 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)!

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.