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High Voltage System Upgrade Meeting Summary: Insights from Stockholm (June 2013)

This document outlines the key points from the High Voltage System upgrade meeting held in Stockholm from June 3-5, 2013. Representatives François Vazeille, Roméo Bonnefoy, Christian Fayard, Marie-Lise Mercier, and Eric Sahuc presented updates on previous progresses, current status, and future testing plans for the HV system. Topics covered included regulatory changes, design advancements, and noise management in HV cards. Detailed steps for upcoming tests and system integrations were also discussed, ensuring clarity on the project’s trajectory moving forward.

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High Voltage System Upgrade Meeting Summary: Insights from Stockholm (June 2013)

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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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