Anti-solenoid design status
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Anti-solenoid design status Latest field maps and doors inclusion in the MDI model 1 16 December 2011 A. Bartalesi
description
Anti-solenoid design status . Latest field maps and doors inclusion in the MDI model. Part one: Field maps. Field maps – BZ. Field maps – BZ & BZ interp. Field maps – BZ interp. Field maps – BR. Field maps – BR & BR interp . Field maps – BR interp. Can we clean this much?. - PowerPoint PPT Presentation
Transcript of Anti-solenoid design status
A. Bartalesi1
Anti-solenoid design status
Latest field maps anddoors inclusion in the MDI model
16 December 2011
A. Bartalesi2
Part one: Field maps
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Field maps – BZ
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Field maps – BZ & BZ interp.
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Field maps – BZ interp.
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Field maps – BR
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Field maps – BR & BR interp.
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Field maps – BR interp.
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Can we clean this much?
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Those field maps may look too much processed.BUT:- This is the best we can obtain with the actual
configuration: if those maps are still bad for the beam we will need additional shielding or correctors.
- Inside QD0 BZ and BR will be surely zero on the magnetic axis, except in case of severe (unacceptable) saturation of QD0
- Shielding the beam line outside the detector should be easy.
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Part two: cavern doors
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Cavern doors (in carbon steel)have been included
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First thing to notice: saturation
of the doors(1.4 T at the
center)
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Forces have been integrated
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Region of integration: a “half door”
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FX -1052 N cancellation 70.0% FY -2 N cancellation 99.8% FZ -142400 N cancellation 2.2% MX 384 Nm cancellation 99.9% MY -2042 Nm cancellation 79.1% MZ 14 Nm cancellation 99.9%
(Torques are evaluated at the center of the integrated region)
Resulting forces and torques
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Self balanced
loads, investigate stresses?
Each half door attracts the other half
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Field outside the yokeon XY plane
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Field outside the yokeon XZ plane
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Field outside the yokeon XY plane WITHOUT doors
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Door position
Yoke end (8 m)
50 m from IPX
8 mT
40 mT
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Flux escaping from the yokeWITHOUT doors
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Integrated BZ = 3.5 Tm²
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Remarking that the field outside the yoke strongly depends on the yoke lamination and material, which are not final yet, we can observe: The field outside the yoke is very low, in the
order of 0.01 T at 14 m from the IP. Integration from radius 8 m to 50 m gives 14 Tm².
However the doors occupy a section which is just 0.4 m² in the XY plane, and they are big objects with large attraction capability. Integration of field on the door XY section gives just 0.56 Tm².
Further investigation on the shielding?
Considerations
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Conclusions
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From a field map point of view, the effect on beam dynamics is being shown by B.Dalena today.In terms of anti-solenoid performance, there is not really a margin of improvement without reconsidering the overall layout.
About the cavern doors, the forces estimated seems addressable. The shielding provided and the permanent magnetization of the steel still need some investigation.
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Thank you very much for your attention!
I wish you a Merry Christmas and a happy new year
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Appendix:material used for doors
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