Post on 22-Feb-2016
description
A. Bartalesi1
Anti-solenoid design status
Latest field maps anddoors inclusion in the MDI model
16 December 2011
A. Bartalesi2
Part one: Field maps
16 December 2011
A. Bartalesi3
Field maps – BZ
16 December 2011
A. Bartalesi4
Field maps – BZ & BZ interp.
16 December 2011
A. Bartalesi5
Field maps – BZ interp.
16 December 2011
A. Bartalesi6
Field maps – BR
16 December 2011
A. Bartalesi7
Field maps – BR & BR interp.
16 December 2011
A. Bartalesi8
Field maps – BR interp.
16 December 2011
A. Bartalesi9
Can we clean this much?
16 December 2011
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.
A. Bartalesi10
Part two: cavern doors
16 December 2011
A. Bartalesi11
Cavern doors (in carbon steel)have been included
16 December 2011
First thing to notice: saturation
of the doors(1.4 T at the
center)
A. Bartalesi12
Forces have been integrated
16 December 2011
Region of integration: a “half door”
A. Bartalesi13
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
16 December 2011
Self balanced
loads, investigate stresses?
Each half door attracts the other half
A. Bartalesi14
Field outside the yokeon XY plane
16 December 2011
A. Bartalesi15
Field outside the yokeon XZ plane
16 December 2011
A. Bartalesi16
Field outside the yokeon XY plane WITHOUT doors
16 December 2011
Door position
Yoke end (8 m)
50 m from IPX
8 mT
40 mT
A. Bartalesi17
Flux escaping from the yokeWITHOUT doors
16 December 2011
Integrated BZ = 3.5 Tm²
A. Bartalesi18
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
16 December 2011
A. Bartalesi19
Conclusions
16 December 2011
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.
A. Bartalesi20 16 December 2011
Thank you very much for your attention!
I wish you a Merry Christmas and a happy new year
A. Bartalesi21
Appendix:material used for doors
16 December 2011