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High Voltage System outside Drawers

High Voltage System outside Drawers. Tilecal upgrade meeting at Stockholm (3-5 June 2013) François Vazeille on behalf of Roméo Bonnefoy, Christian Fayard, Marie-Lise Mercier, Eric Sahuc.  Summary of previous progresses Present status Tests and next steps. 1.

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High Voltage System outside Drawers

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  1. High Voltage System outside Drawers Tilecal upgrade meeting at Stockholm (3-5 June 2013) François Vazeille on behalf of Roméo Bonnefoy, Christian Fayard, Marie-Lise Mercier, Eric Sahuc. •  Summary of previous progresses • Present status • Tests and next steps 1

  2. Summary of previous progresses • Several options reported since a long time • HV regulation inside/outside Drawers • [Tilecal meetings: February 2008, November 2009, September 2012] • Clermont-Ferrand proposition to develop an outside option, • but ready to provide all the information on the present ATLAS inside option. • Choice of the outside option 3: • - Re-cycling of HV cards inside a special crate put in the electronics room. • - Design of HV bus cards sharing the individual HV’s (with noise killers). • - Use of multiconductor cables to supply the HV bus cards. 2

  3. New HV Bus boards (no active components) • 12 channels. • A 4-layer printed circuit: External layers as shielding, • Internal layers to distribute the HVs. • - Noise killers everywhere. • New HV connectors (more robust), but 8 weeks delivery delay New HV regulation crate: ¼ of the total space (4 Modules later) Rear HV LV’s Individual Hvout: SUBD25 connectors Front 3 CANBUS

  4. Present status HV Bus boards ready to equip 3 trains of Mini-Drawers A cable tray will run 3 different cable lengths towards Drawers 2, 3 and 4 (Fixation holes made here) 4

  5. Regulation crate HV Source Operational DCS Various cable lengths • 1m long. • 4 times 20 m long (175) • 100 m long, to reproduce ATLAS. 5

  6. Tests and next steps • Clermont-Ferrand tests • HV tests in progress, with a PMT Block lighted by a blue LED •  Noise measurements for different cable lengths. •  Results the next time. • CERN tests • - Mini-Drawer handling/connection tests in building 175 using Slider and Basket, • in the same time as mechanics tests. • - HV tests in building 175, once the Clermont-Fd tests will be fully efficient. • - Equipment of a Demonstrator in Building 175. 6

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