Barrel DIRC Mechanics -Update Andreas Gerhardt PANDA Collaboration - - PowerPoint PPT Presentation

Barrel DIRC Mechanics

• Update

Andreas Gerhardt PANDA Collaboration Meeting 19/2 Darmstadt, 2019/06/25

Andreas Gerhardt – PANDA Collaboration Meeting

Outline

• Barrel DIRC Main Components
• Conceptual Design of the Radiator Frame
• Potential Usage of Shared Installation Platforms
• Downstream Overlap of GEM/DIRC Border

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Andreas Gerhardt – PANDA Collaboration Meeting

Barrel DIRC Main Components

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Radiator Barrel (SciTil Support)

• Internal radius 448mm
• External radius 538mm
• Total weight ≈ 400kg

Readout Unit

• Internal radius 448mm
• External radius 1080mm
• Total weight ≈ 500kg

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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Radiator Barrel Frame:

• Slots for 16 bar boxes
• Slots for 16 SciTil boxes
• Central tracker beams included

Support structure of the barrel:

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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Support structure of the barrel:

• uter sheet (CFRP)

downstream ring (aluminum)

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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• uter sheet (CFRP)

downstream ring (aluminum) upstream ring (aluminum) 16 slot profiles (extruded aluminum) inner sheets (CFRP)

Support structure of the barrel:

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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2 CT beams (extruded aluminum)

Support structure of the barrel:

• uter sheet (CFRP)

downstream ring (aluminum) upstream ring (aluminum) 16 slot profiles (extruded aluminum) inner sheets (CFRP)

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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CT beams integration:

previous design of the CT beams bar box slot SciTil slot Barrel DIRC volume slot profile flanges to connect rail-system for STT frame

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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CT beams integration:

new design of the CT beams bar box slot SciTil slot Barrel DIRC volume slot profile flanges to connect rail-system for STT frame (still needed?)

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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CT beams integration:

new conceptual design of the CT beams Barrel DIRC volume Advantages:

• no connections to slot profiles necessary
• less parts; less material; etc.

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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Connection between rings and profiles (downstream): joining bolts slot profile machined profile contour

• Mechanical joining with bolts

to reach a high precision.

• Machined profile contour to reach a

defined gap for an adhesive joint.

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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Connection between rings and profiles (upstream):

• Mechanical joining with bolts

to reach a high precision.

• Machined profile contour to reach a

defined gap for an adhesive joint. joining bolts slot profile

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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Conceptual Design of the outer sheet:

• Outer sheet directly fabricated to the frame

to reach a stiff, form-locked connection.

• Cylindrical shape changed to polygon shape.
• uter sheet

Andreas Gerhardt – PANDA Collaboration Meeting

Conceptual Design of the Radiator Frame

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Conceptual design of the outer sheet:

• uter sheet –

polygonal shaped inner sheet – cylindrical shaped

Andreas Gerhardt – PANDA Collaboration Meeting

Potential Usage of Shared Installation Platforms

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DIRC radiator barrel installation: DS support cone Barrel DIRC frame Barrel EMC installation platform

Andreas Gerhardt – PANDA Collaboration Meeting

Potential Usage of Shared Installation Platforms

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DIRC radiator barrel installation:

• The Barrel EMC

installation beam fits into the Barrel DIRC radiator frame.

Andreas Gerhardt – PANDA Collaboration Meeting

Potential Usage of Shared Installation Platforms

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DIRC radiator barrel installation:

• After the DS support cone is

installed, the Barrel DIRC frame can be moved in. Access is needed on the upstream and downstream side of the barrel.

Andreas Gerhardt – PANDA Collaboration Meeting

Potential Usage of Shared Installation Platforms

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DIRC radiator barrel installation:

• A shared usage of the

installation platform could be possible, but…

Andreas Gerhardt – PANDA Collaboration Meeting

Potential Usage of Shared Installation Platforms

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Slides from talk of Valeriy Ferapontov – February 2019

• … the preliminary concept intends to lift the installation

beam to move it out of the barrel. This could be a problem with the dimensions of the Barrel DIRC.

Andreas Gerhardt – PANDA Collaboration Meeting

Potential Usage of Shared Installation Platforms

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DIRC bar boxes (+SciTil boxes) installation: aux platform needed space for special device bar box (SciTil box) additional access needed close to the barrel

Andreas Gerhardt – PANDA Collaboration Meeting

Potential Usage of Shared Installation Platforms

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DIRC readout unit (+prism boxes) installation: prism box readout unit frame additional access needed close to the barrel aux platform

Andreas Gerhardt – PANDA Collaboration Meeting

Downstream Overlap of GEM/DIRC Border

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GEM Barrel DIRC CT beam

Andreas Gerhardt – PANDA Collaboration Meeting

Downstream Overlap of GEM/DIRC Border

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≈ 18mm overlap of the CT beams; inner flanks CT beam GEM

Andreas Gerhardt – PANDA Collaboration Meeting

Downstream Overlap of GEM/DIRC Border

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• ≈ 2mm overlap of the GEM and the Barrel DIRC inner sheet
• a lot of 0-contacts between GEM and Barrel DIRC surfaces (need to check the

safety distances)

Involved groups are in contact and working on a solution…

Barrel DIRC inner sheet GEM

Thank you for your attention.