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

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Summary of previous progresses

· Several options reported since a long time HV regulation inside/outside Drawers

[Tilecal meetings: February 2008, November 2009, September 2012]

Þ 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.

· Clermont-Ferrand proposition to develop an outside option, but ready to provide all the information on the present ATLAS inside option.

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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)

HV

LV’s

Individual Hvout:SUBD25 connectors

CANBUS

Rear

Front

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Present status

HV Bus boardsready to equip 3 trains of Mini-Drawers

A cable tray will run3 different cable lengths

towards Drawers 2, 3 and 4(Fixation holes made here)

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Regulationcrate

HVSource Operational DCS

Various cable lengths

- 1m long.- 4 times 20 m long (175)- 100 m long, to reproduce ATLAS.

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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.

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