K.Wyllie Electronics meeting 29/05/061

RICH Power Supplies & Grounding

Thanks to Johan MorantPaolo Baesso

Xavier Le Gouard

K.Wyllie Electronics meeting 29/05/062

Example: RICH2 module

Each module is mechanically and electrically independent.

Cooling plate (not shown) grounded.Plastic pipes for insulation

K.Wyllie Electronics meeting 29/05/063

Power connections & grounding

MaratonLV (5V) channel 1 – floating. Tested

MaratonLV (5V) channel 2 – floating. Tested

CAEN SY1527LC- A1511BSi bias (80V) – floating. Tested

ISEG (20kV) – varistor protection.

Under test

K.Wyllie Electronics meeting 29/05/064

Module Power and Grounding

Within module – one common ground, connected to safety earth

Local ST-4913 regulators few cm from load (L0 + HPD)Regulators enabled/disabled by SPECS slave

Allows possibility to enable/disable L0s/HPDs => a ‘gentle’ power-up sequence

We power-up with a well-defined sequence for each module:

Turn on LV suppliesTurn on Si bias

Enable regulators for L0/HPDs (SPECS)Enable GOLs on L0 (SPECS)Loop for all L0s in module

Filtering of LV, Si bias (and HV) done locally

SPECS – shield of cable connected to module ground AND SPECS master ground. No problems seen yet……….

K.Wyllie Electronics meeting 29/05/065

Tests with Maraton

Tested in lab with programmable load

Then used in system tests & Frascati testbeams since January

K.Wyllie Electronics meeting 29/05/066

Hardware

12-channel 6U prototype now in constant use in labs

Not yet operated with all channels used (maximum so far is 6 out of 12 = 3 modules)

Sense…… looks OK, more tests to be done

Tested with proposed grounding scheme – no problems

All ‘analog’ settings with potentiometers

Needs water cooling – particular connectors for pipes

Documentation VERY bad

K.Wyllie Electronics meeting 29/05/067

Software

Tests done with simple user-panel, via USB

OPC server from Wiener seems to work (although installation is not obvious…..)Maraton is now networked (same as CAEN system)Now included in PVSS framework

Panels/ FSM under development

K.Wyllie Electronics meeting 29/05/068

Conclusions

Power and grounding scheme follows LHCb recommendations

Tested successfully with prototype and production modules:

System tests in lab since summer 2005

Two testbeams in Frascati

Tests on-going, adding final HV system

Good experience with Wiener Maraton in system-tests/testbeams