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Outcome of the Review and Response to Recommendations

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Presentation on theme: "Outcome of the Review and Response to Recommendations"— Presentation transcript:

1 Outcome of the Review and Response to Recommendations

2 Overview Outcome of review meeting Comments and recommendations Update on PRY

3 Presented solution: Partial Return Yoke Findings
Review Meeting 23rd/24th of September Presented solution: Partial Return Yoke Findings Recognition: intensive programme of FE modelling The team is to be congratulated on the effort that has gone into this work The design of the PRY shielding and the procedure for installation are basically sound The ISIS Group is satisfied with the work being done by the MICE Collaboration to control the level of stray field

4 Comments The strategy of improving the shielding now to reduce the risk of losing running time later is sound less attention has been paid as to the effect of the presence of the new PRY shielding on the coil Design improvements: Symmetrize support structure Compatibility with Step VI

5 Recommendations Platform on the north side of the experiment
Ensure that PRY does not increase risk of coil failure Forces and coil quenches Modify PRY: independent of mezzanine Compatibility of PRY with Step VI Commissioning plan for Step IV Validate results of Step IV with measurements Steve Plate: UK visit Watch schedule Fit-up / pre-assembly Assembly instructions Steve Plate in UK

6 Effect of PRY on Solenoids
Quenches Forces Variation in material parameters Offsets

7 Effect of PRY on Quenches
Superconducting state: fct (B, J, T) Effect of PRY: changes B Simulation 1: Step IV configuration with PRY Simulation 2: Extrusion coupling: use magnetization of Simulation 1 No coil currents Done for 240 MeV flip and solenoid mode (MICE: NbTi, Cu:Sc = 4)

8 Effect of PRY on Quenches
240 MeV Flip Mode 28.5 mT Spectrometer+End coil 2

9 Effect of PRY on Quenches
240 MeV Solenoid Mode 23 mT End coil 2

10 Tc End Coil 2 240 MeV Flip L. Bottura, “A practical fit for the critical surface of Nb–Ti”. DOI: /

11 ΔTc End Coil 2 ΔTc < 0.02 K Assume ΔB of 30 mT everywhere

12 Spectrometer Solenoid, B
240 MeV Flip

13 Spectrometer Solenoid
Note: steps due to Bisection method ΔTc < 0.02 K

14 240 MeV Solenoid, End Coil 2 Tc ΔTc ΔTc < 0.02 K

15 Variation of Material Properties
Half PRY Simulation Iron Air

16 Magnetization 240 MeV Flip

17 Half PRY Simulation Forces in Newton Fx FC M1 M2 E1 SS E2 240 MeV Sol
-587 494 39 -254 -6253 -3048 240 MeV Flip -4273 -2835 -2673 -2315 -10344 -3414 PRY1 (Sol/Flip): Fx=19776 N / N Fy FC M1 M2 E1 SS E2 240 MeV Sol -596 87 140 53 -159 -155 240 MeV Flip -1935 174 576 50 -243 -167 Acceptable force: 1/3 of longitudinal force Tracker: 50 tons FC: tons

18 Forces – Simple Study

19 Result

20 Solenoid Mode - Forces

21 Flip Mode - Forces

22 Update on PRY - Stray field
Discrepancy: MICE hall model predicts larger stray fields Increased stray field Differences in coil geometries/currents Differences in PRY geometry Position of Virostek disc

23 Coil Geometry Difference in coil cross-section:
M1 (TRD) M1 M2 (TRD) M2 R1 (mm) 255 258 R2 (mm) 355 302.7 312 287.8 Z1 (mm) 3752 3711.6 4193 4150.8 Z2 (mm) 3550 3510.4 3991 3951.3 J (A/mm2) 71.31 71.6 65.6 66 Difference in coil cross-section: M1: 20200/ = 2.25 M2: 11514/ = 1.94

24 New Solenoid Currents Old New

25 PRY Geometry – Backing Plates
Updated model, including centre section

26 Residual Field

27 Residual Field

28 PRY Geometry – Lap Joint
Stray field looks ok, but…

29 Lap Joint Design - Forces
190 kN 94 kN 94 kN Analogy: N S N S N S

30 Solenoid Mode

31 Flip Mode

32 Review: very positive feedback MICE solenoids: not affected by PRY
Summary Review: very positive feedback MICE solenoids: not affected by PRY Engineering suggestions: underway Compatibility with Step VI Lap joint design Not considered anymore

33 Additional Slides

34 Process for Releasing Steel
Preliminary survey in controlled area No dose rate above background: move steel to low background area Survey on 8” grid pattern using hand held meter Examination with High Purity Germanium (HPGe) gamma spectroscopy unit only Naturally Occurring Radioactivity Material: release for free use

35 EVA Magnet Steel

36 EVA Magnet Steel Unknown pedigree Controlled area Engineering C 0.3%?
Measurements: 1 month Controlled area Release process: 2 months? Risk: only naturally occurring radiation allowed Engineering Additional weight Space

37 Magnetization – 240 MeV Flip Mode Solenoid Mode

38 Stray Field JFE-EFE Steel

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