Difference: MagnetMinutes071211 (1 vs. 3)

Revision 3
17 Jan 2008 - Main.EvieDownie
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META TOPICPARENT name="Magnet071211"
Magnet : Meetings : Magnet071211 : MagnetMinutes071211

Magnet Discussion Meeting

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1) Attendance

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Present:- Andrea Bersani (Genova), Evie Downie (Glasgow), Alexander Efremov (Dubna), Francisco Garcia (Helsinki), Michela Greco (Torino), Inti Lehmann (Glasgow), Berndt Lewandowski (GSI), Edward Lisowski (Krakow), Yuri Lobanov (Dubna), Jost Lhning (GSI), Agnello Michaelangelo (Torino), Dario Orecchini (Frascati), Herbert Orth (GSI), Renzo Parodi (Genova), Andrea Pastorino (Genova), Mauro Savrie (Ferrara), Lars Schmitt (GSI), Sandro Thomassini (Frascati), Alexander Vodopianov (Dubna)
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Present:- Andrea Bersani (Genova), Evie Downie (Glasgow), Alexander Efremov (Dubna), Francisco Garcia (Helsinki), Michela Greco (Torino), Inti Lehmann (Glasgow), Berndt Lewandowski (GSI), Edward Lisowski (Krakow), Yuri Lobanov (Dubna), Jost Lhning (GSI), Michaelangelo Agnello (Torino), Dario Orecchini (Frascati), Herbert Orth (GSI), Renzo Parodi (Genova), Andrea Pastorino (Genova), Mauro Savrie (Ferrara), Lars Schmitt (GSI), Sandro Thomassini (Frascati), Alexander Vodopianov (Dubna)
 

2) Minutes

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Dimension of radius / mm axial length / mm Zmin Zmax
Cryostat Inner 950 3130 -1180 1950
Cryostat Outer 1340 3130 -1180 1950
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Yoke Inner 1490 4050 -1585 2475
Yoke Outer 2240 4875 -1970 2915
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Yoke Inner 1490 4060 -1585 2475
Yoke Outer 2240 4885 -1970 2915
 

The radial dimensions of the magnet yoke were considered first. It was agreed by all that the cryostat should be contained within 950 mm to 1340 mm and that the main barrel of the yoke should be contained within 1490 mm to 2240 mm in the radial direction. It was accepted that the radial yoke dimensions applied only to the main barrel as it may be necessary to extend further than this in the region of the forward and rear doors to allow for door attachment mechanisms and suspension devices.
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It was mentioned that the unbalanced axial forces were best resisted in a way that produced tensile rather than compressive stresses in the structure. Thus a design in which the unbalanced axial force is directed downstream might be preferable, as then the coil is best suppported in the upstream region where space is less restricted. Andrea Bersani explained that the force on the current Genova coil design, although directed upstream, was supported by attachment of the coil to the inside of the cryostat in the upstream direction, and that it has been calculated that forces of 100 tonnes would then be adequately transmitted through the 3 cm stainless steel cryostat wall to the upstream region.
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Presentations were then made by Yuri Lobanov, Renzo Parodi and by Andrea Bersani, the slides of all presentations are available on the magnet wiki page at:- . http://panda-wiki.gsi.de/cgi-bin/view/Magnet/MagnetMinutes071211. Yuri Lobanov showed the effect of the external support frame on the structural rigidity of the magnet, reducing the structural deviation under load from 6.5 to 1.4 mm. He also presented a shorter coil option, achieved by increasing the current density. Concern was expressed that this increase in current density and shortening of the coil might reduce the overall field quality. Andrea Bersani made a detailed presentation of the latest Genova Magnet design, which complies with all known field requirements and the reviewers' recommendations and has 13 full-length laminated layers in the magnet barrel iron. Renzo Parodi showed the latest developments in the Genova coil, which included a slight modification of the cable cross-section.
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Presentations were then made by Yuri Lobanov, Renzo Parodi and by Andrea Bersani, the slides of all presentations are available on the magnet wiki page at:- http://pandawiki.gsi.de/cgi-bin/view/Magnet/MagnetMinutes071211. Yuri Lobanov showed the effect of the external support frame on the structural rigidity of the magnet, reducing the structural deviation under load from 6.5 to 1.4 mm. He also presented two shorter coil options, achieved by increasing the current density and also without current density increase in order to liberate space in the downward region of the magnet. Both options keep all field parameters within requested frames and ensure that the parameters satisfy all requirements even if the coil is shifted by 1 cm in any direction with respect to the yoke. Concern was expressed that this increase in current density and shortening of the coil might reduce the overall field quality. Andrea Bersani made a detailed presentation of the latest Genova Magnet design, which complies with all known field requirements and the reviewers' recommendations and has 13 full-length laminated layers in the magnet barrel iron. Renzo Parodi showed the latest developments in the Genova coil, which included a slight modification of the cable cross-section.
 

Lars Schmitt expressed enthusiasm for the progress that had taken place in the meeting and encouraged the group to continue this movement towards the allocation of work packages in the near future. He suggested that the yoke dimensions and design should be our initial focus as this forms the physical boundary for the detector design and that, once we have a more complete picture of the yoke, then we should focus on the coil optimisation in more detail. He indicated that the yoke dimensions would be a focus of discussion in the Technical Board Meeting on 12th December 2007.
Revision 2
16 Jan 2008 - Main.IntiLehmann
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META TOPICPARENT name="Magnet071211"
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Magnet : MagnetMinutes071211
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Magnet : Meetings : Magnet071211 : MagnetMinutes071211
 

Magnet Discussion Meeting

GSI, SB3 3.170

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Magnet : MagnetMinutes071211
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Magnet : Meetings : Magnet071211 : MagnetMinutes071211
 

-- Created by EvieDownie - 15 Jan 2008

 
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