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Tracker Solenoid Module Design Update Steve VirostekStephanie Yang Mike GreenWing Lau Lawrence Berkeley National LabOxford Physics MICE Collaboration Meeting.

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Presentation on theme: "Tracker Solenoid Module Design Update Steve VirostekStephanie Yang Mike GreenWing Lau Lawrence Berkeley National LabOxford Physics MICE Collaboration Meeting."— Presentation transcript:

1 Tracker Solenoid Module Design Update Steve VirostekStephanie Yang Mike GreenWing Lau Lawrence Berkeley National LabOxford Physics MICE Collaboration Meeting October 23, 2005

2 Tracker Module Design Update Steve Virostek - LBNLPage 2 Design Update Summary Changes to baseline design: Modified coil geometries (covered in Mike Green’s talk) Increased outer vessel diameter to match AFC & RFCC modules Designed new support stand similar to RFCC module Developed new concept for magnetic shielding support Design and analysis progress: Preliminary 3D model of the updated module design is complete FEA modeling of the support stand, end plates and magnetic shielding is done Vessel shell designed to meet pressure vessel code requirements (PD 5500) Upcoming Tasks: Integrate radiation shutter with tracker module outer vessel in 3D model Complete full model, coupled load analyses and refine design Perform a vacuum system analysis including the effects of fields on pumps Develop a specification for procurement of the tracker solenoid module

3 Tracker Module Design Update Steve Virostek - LBNLPage 3 Tracker Module 3D Model Magnetic shielding Cold mass supports Radiation shutter Steel tube supports Cryocooler port Magnetic shielding supports Coil lead feedthrough Side plates

4 Tracker Module Design Update Steve Virostek - LBNLPage 4 Design of the tracker module support stand Vessel and Stand 2D Drawing 10mm thick plate 100 x 100 x 5 box section

5 Tracker Module Design Update Steve Virostek - LBNLPage 5 Iron Shielding Support Concept

6 Tracker Module Design Update Steve Virostek - LBNLPage 6 Shielding Support Details

7 Tracker Module Design Update Steve Virostek - LBNLPage 7 Vessel and Support Analyses FEA of outer vessel and support subject a uniform, circumferentially distributed 50 ton axial load on vessel FEA of end plate and inner tube due to external pressure Hand calculation of end plate due to external pressure Hand calculation of outer vessel due to external pressure FEA of magnetic shielding support subject to gravity only FEA of magnetic shielding support subject to uniformly distributed 50 ton axial force

8 Tracker Module Design Update Steve Virostek - LBNLPage 8 Vessel & Support FEA Results 50 ton, uniform axial load on vessel; fully fixed at support stand base Max stress: <100 MPa

9 Tracker Module Design Update Steve Virostek - LBNLPage 9 Vessel & Support FEA Results 50 ton, uniform axial load on vessel; fully fixed at support stand base Max deflection: 1mm

10 Tracker Module Design Update Steve Virostek - LBNLPage 10 End Plate & Inner Tube FEA 0.1 MPa external pressure; outer edges of end plates are fixed Max stress: 128 MPa

11 Tracker Module Design Update Steve Virostek - LBNLPage 11 End Plate & Inner Tube FEA 0.1 MPa external pressure; outer edges of end plates are fixed Max deflection: 0.7 mm

12 Tracker Module Design Update Steve Virostek - LBNLPage 12 End Plate Analysis (hand calc.) 50 mm 200 inner radius 700 mm radius 650 mm outer radius Roarke’s Handbook covers the case of an annular disk subjected to uniform pressure and with fully fixed inner and outer edges (similar to our case): Max. bending stress = 145 MPa Max. deflection = 0.6mm FEA modeling results gave 128 MPa stress and 0.7 mm deflection for the end plates – this difference is expected since the edges are not fully fixed PD 5500 gives the allowable bending stress as 207 MPa for stainless steel, so the stress levels are acceptable

13 Tracker Module Design Update Steve Virostek - LBNLPage 13 Outer Vessel Analysis (hand calc.) The allowable external pressure for 15mm thick vessel is 1.39 MPa (>>0.1 MPa) Details of compliance with the pressure vessel code PD 5500 need to be addressed

14 Tracker Module Design Update Steve Virostek - LBNLPage 14 Magnetic Shielding FEA (gravity) 1 g load on magnetic shielding attached to vessel; fully fixed at support stand base Max stress: 17.4 MPa

15 Tracker Module Design Update Steve Virostek - LBNLPage 15 Magnetic Shielding FEA (gravity) 1 g load on magnetic shielding attached to vessel; fully fixed at support stand base Max deflection: 0.1mm

16 Tracker Module Design Update Steve Virostek - LBNLPage 16 Magnetic Shielding FEA (gravity) 1 g load on magnetic shielding attached to vessel; fully fixed at support stand base Max deflection in Y: 0.09mm

17 Tracker Module Design Update Steve Virostek - LBNLPage 17 Magnetic Shielding FEA (axial load) 50 ton axial load on magnetic shielding w/vessel; fully fixed at support stand base Max stress: 315 MPa Max bending stress: 315 MPa

18 Tracker Module Design Update Steve Virostek - LBNLPage 18 Magnetic Shielding FEA (axial load) 50 ton axial load on magnetic shielding w/vessel; fully fixed at support stand base Max deflection: 2.5mm Further input needed on actual shielding load

19 Tracker Module Design Update Steve Virostek - LBNLPage 19 Vacuum Pumping Issues Standard cryo pumps can be affected by magnetic fields CryoTorr 8 (Helix Technology Corp.) is limited to 200 gauss The cold head motor can seize at higher fields Current MICE layout includes pumps in high field locations Mitigation strategies: move pumps out of high fields or add local shielding Moving pumps reduces conductance and effective pumping speed Local shielding can unacceptably perturb the magnetic field Likely solution is a combination of pump relocation and shielding Further work will be required to develop an optimal solution Calculation of pumping effectiveness as a function of location Determination of magnetic field strength as a function of location Analysis of the effects of shielding material on the magnetic fields Exploration the availability of pumps less sensitive to magnetic fields

20 Tracker Module Design Update Steve Virostek - LBNLPage 20 Tracker Module Design Summary Recent modifications to design and 3D model include new coil geometry, increase in outer vessel diameter, revised support stand design and redesigned magnetic shielding support Separate analyses of the outer vacuum vessel, inner tube and end plates, module support stand and magnetic shielding support with vacuum, magnetic and gravity loading are done Upcoming tasks include radiation shutter integration with the 3D model, development of a full FEA model under combined loading and a vacuum system/field analysis (all MICE modules) Development of a detailed specification for obtaining bids for procurement of the tracker solenoid module is under way


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