PANDA Tracking Meeting Jülich October the 10 th 2013 STT gas system a possible implementation Guidelines adopeted to flush the PANDA straws Parameters to be controlled The gas flow piping: a possible realization with manifolds Test of gas sealing on prototype manifold Conclusions and open questions V. Lucherini – INFN LNF
Setting the Task To flux a mixture of gases, Argon-C 02, 10(20)-90(80), through » 4650 straw tubes, assuring a given number (» 4 ) of gas changes per day in their overal volume (of » 1000 l). To ensure the required overpressure (» 2 bar), purity grade and sealing of the mixture. To reduce the redundancy of the system to lower the costs, the material budget and the complexity. To ensure a minimal redundancy to guaranty, in case of failure of single components, the operation of at least parts of any sector; Full automated setting and remote control, with the possibility to switch to manual/local operation, of the gas flow parameters as: - ratio of the two components in the gas mixture; - quantifying the Inlet / Outlet gas flow; - setting and controlling the gas over pressure; - controlling the temperature; - (uninterrupted gas flow). 2
Settling the Task Build independent pipe lines, arranged in such a way to ensure an independent gas flux in every sector and in each main subdivision of each sector. - one line per sector for each (inner & outer) axial straw regions: 6× 2 = 12 lines; – two lines per sector for each of the stereo straw groups: 6 × 2 = 12 lines. Total: 24 pipe lines ( + 24 return pipes). Layout SST gas flux Control System (M. Bragadireanu talk) 3
- STT (Straw Tubes Tracker ) &“Service Support Frame” -Gas Pipes” lines: n. 4 -Total “Gas Pipes” lines: 12 (For left half-tracker) -Gas Pipes” lines: n. 4 Gas Distribution to straws on this side - STRAW TUBE TRACKER - SERVICE SUPPORT FRAME -Gas Pipes” lines: n. 4 p straw-to-straw gas piping on this side -Total “Gas Pipes” lines: n. 12 (For left half-tracker) 1000 mm 4
PATHWAYS OF GAS PIPES (and HV cables) 12 Gas Pipes 20 HV Cables 4 Gas Pipes (From the Forward Side) -The encumbrance of the connectors has not been considered! HV CABLE DATA 8 Gas Pipes (From the Forward Side) 13 HV Cables 13 - Cross Section 8, 1 mm^2/each - Total: 8, 1 x 20 = 162 mm^2 (Each Pathway) - Weight: 0, 0162 Kg/m 7 Theoretical needed cross section for each top & bottom pathway: 162+340= 502 mm^2 13 HV Cables 6 8 Gas Pipes (From the Forward Side) 13 HV Cables 13 GAS PIPE DATA - Cross Section 28, 26 mm^2/each - Total: 28, 26 x 12 = 340 mm^2 (Each Pathway) - Weight: 0. 016 kg/m 4 Gas Pipes (From the Forward Side) 12 Gas Pipes 5 20 HV Cables Backward side
- GAS PIPES - Weight: 0, 0162 Kg/m Outer diam: 6 mm Inner diam: 4 mm Inox pipes to distribute (recover) the gas flow to individual straws 6
- STRAW TRACKER GAS SYSYTEM INTEGRATION. GAS PIPES GUIDE p FLUX TO INDIVIAL STRAWS STRAW MODULES SUPPORT END-PLATE GAS MANIFOLD SYSTEM Bleu pipes: gas inlet Yellow pipes: gas outlet 7
Manifold for the Inner Layer Bleu pipes: gas inlet Yellow pipes: gas outlet 8
Manifold for the Skewed Layer Bleu pipes: gas inlet Yellow pipes: gas outlet 9
Manifod for the Outer Layer Bleu pipes: gas inlet Yellow pipes: gas outlet 10
Enlarged view of some of the Manifolds Bleu pipes: gas inlet Yellow pipes: gas outlet 11
Forward side: pictorial view of the manifols for one sector: three for each one Bleu pipes: gas inlet Yellow pipes: gas outlet 12
Forward side: pictorial view of the manifols for one sector: three for each one Bleu pipes: gas inlet Yellow pipes: gas outlet 13
Manifold encumbrance p I. P. 1060 mm 1142 mm 14
Manifold prototype and test No gas leakeage from the prototype (made in plexiglas) in a fist test lasting four days 15
Conclusions and open questions A piping system to flux the SST hase been devised trying to follow the guidelines of the SST TDR. A compact network of pipes, distributed in an appropriate way in the external surface of the SST set-up can allow to bring the inlet and outlet gas flow in a compact way A manifold has been devised as a possible “interface” between the inlet/outlet gas pipes and the distributor of the gas mixture to the individual straws A propotype manifold has been realized and succesfully tested for gas sealing …of course this is just one, between many, of the possibile solutions of the task. . . 16
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