Next mtg to discuss EE HV dist systemFrom: Dave Cockerill
Sent: 12 March 2007 09:38
To: Dave Cockerill; 'Claire H Shepherd-Themistocleous'; Bob Brown; Martin Torbet; Barbara Camanzi; Ken Bell; 'R.Stephenson@rl.ac.uk'
Subject: Minutes EE HV dist system, 1 Feb 2007

Importance: High

Minutes EE HV dist system, 1 Feb 2007 

Present Martin, Bob, Ken, Barbara, Dave

Martin - System based on 1 input card + 1 control card + 2 output cards => serves 24 supercrystals  
            Box 3U high into 19" rack
            Assume air flow goes around box
            6 o/p cards per crate, up to 5 or 6 i/p cards
            1 crate/quad for standard SCs = 2 crates per Dee
            1 crate for the peripherals = 1 crate per Dee
            3 crates per Dee, 6 crates per end
            + 1 box for low voltage power supply and HV breakout
                        
           ACTIONS
           * add warning leds, front and back for HV and LV
           * i/p cards, one led per fault line
           Define: "Fault output", out of crate
                      "Ext-trip"
                      "Ext-reset"
           * Crate trip - clamps all cards down until an external reset
           * 1 reset button on crate, one on rack?
           * Overvoltage V(limit) = 1500V, fixed by resistors
           * Lemo for logic and outputs at low voltage
           * Output current monitor = log preamp, 5nA resolution
           * i(over) set at 450 microamp

           WORK PROGRAMME
           layout of cards completed by end April 07            
           Mechanical design of connectors
           Test and acceptance procedures, particularly for the output card (ringing through)

Dave Cockerill
12.3.2007