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DT & RPC Grounding STATUS

DT & RPC Grounding STATUS. M. PEGORARO INFN PD. DT Power & Grounding Layout for One Sector. BALCONY GND. SECTOR collector. Analog P.S. Digital P.S. Analog P.S. Analog P.S. Digital P.S. Analog P.S. Digital P.S. Digital P.S. 20m LV cables. 15m LV cables. Split board.

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DT & RPC Grounding STATUS

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  1. DT & RPC Grounding STATUS M. PEGORARO INFN PD

  2. DT Power & Grounding Layout for One Sector BALCONY GND SECTOR collector Analog P.S. Digital P.S. Analog P.S. Analog P.S. Digital P.S. Analog P.S. Digital P.S. Digital P.S. 20m LV cables 15m LV cables Split board Split board AC coupled LVDS links LVDS SL cover MINI CRATE MINI CRATE LVDS SL cover HC & Al frame HC & Al frame LVDS SL cover SL cover LVDS LVDS SL cover MB1 MB4 Floating Power Supply and AC coupled LVDS links allow common mode freedom

  3. Muon Chamber:LV & GND F Covers Q Superlayer Minicrate LV cables Q Cover From P.S. LVDS signals LV conn. Splitter board GND braids Honeycomb & Al frame GND braids The Al frame lodging the MINICRATE can be a very massive and low inductance GND joining FE covers Splitter Board can be moved along F covers (for example on MB4 to reduce length of LV cables) Signal currents from FE to MINICRATE are negligible (LVDS compatible signals differential termination). If power return of MINICRATE and splitter board are connected in the same point then no current due to internal signals flows out of this point and the chamber can be thought as an independent system.

  4. Example MINICRATE lodgement These 2 photos show an example of the GND connection between SLs and frame made with braid at each corner of one chamber. Note also the copper connecting the external Al plates of each SuperLayer for hermeticity and the thickness of frame extrusions. Totale chamber height is about 30cm. The whole assembly will be insulated from magnet iron.

  5. RPC Grounding Scheme

  6. RPC Power & Grounding Layout for One Sector

  7. Status _ DT and RPC are glued together and surfaces can touch each other; also little gap and wide area lead to a large capacitance between the 2 detectors. Ground coupling is then more than probable. Connecting DT ground to balcony and RPC ground to iron would cause large loops. _ RPC need to ground refer output from detector with link board located just outside iron sector. _ DT should not need such reference; also their ground structure should be rather strong. _ It's better perhaps to connect together their central ground points in a stable way and close to each station in order to reduce loop area. _ RPC also have large surface with little distance from magnet iron so large capacitance inbetween. To avoid effects probably it's better to connect DT and RPC to iron at each station; the reference to link boards can be brought with copper braids in tree configuration if really needed (if the iron of one sector is not assuring contact).

  8. Grounding DT & RPC SL F SL Q (MB3 only) MB3/4 SL F Cu braid to link box RB3/4 RB3/4 Connection IRON RB1/2_OUT SL F SL Q IRON IRON MB1/2 SL F RB1/2_IN

  9. Proposal with Tree Connection

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