SDD DCS status

1. SDD DCS status • Low Voltage system • End-ladder ASIC • High Voltage system • Cooling system • Schedule V.Kouchpil

2. SDD DCS status - LV system (1) • System description: • 6 LV crates (3 per barrel side) with 8 LV modules each • each LV module has 2 identical sections to supply 2 SDD half ladder • 2 LV controllers (1 per SDD barrel) • LV Modules DCS features: • inputs for interlocks controlled by the firmware of the on-board controller • automatic switch-off on anomalous conditions (over-current, over-voltage, over-temperature of the module) • status register that can be inquired by the control software • LV module prototypes tested in lab with 20 m long cables: OK V.Kouchpil

3. SDD DCS status - LV system (2) • LV system production • LV modules finalization waits for final version of FEE • expected by 4/2003 • then: • final LV prototypes produced and tested in 6 months • final production (6 months) completed by 4/2004 • LV Control software: work in progress • communication with LV modules, based on RS-232, is ready • the status registers of the 18 LV modules of half SDD barrel can be read in 1.2 s (the two LV controllers work in parallel) • communication via TPC/IP in development, prototype expected by 2/2003 V.Kouchpil

4. SDD DCS status - End-ladder ASIC (1) • Purpose: checks on cooling system before power-on of the FEE and of SDDs  independent power supply line • Each LV end-ladder board, carrying two LV rad-hard voltage regulators (LHC4913), has one DCS-ASIC • ASIC Features: • 4 analog inputs to read Vin and Vout of the 2 regulators • 3 analog inputs to read the temperature on the inlet water pipe, of the LV- and HV-board heat bridges; range 15-60 oC, resolution 0.1 oC • 2 digital inputs to detect the over-current conditions signaled by the LV regulators • 2 digital output to enable/disable the LV regulators • 7-bits digital output to control the bias current of the laser diodes of the data links, via I2C bus • 2 general purpose analog outputs (8 bit resolution DACs) • communication with the ASIC via twisted-pair LVDS line V.Kouchpil

5. SDD DCS status - End-ladder ASIC (2) • Schedule • submission of 1st prototype in the Aug.2002 MPW • design of the ASIC interface to DCS : 9/2002 • it has to have data multiplexing capabilities and interface with “standard” DCS I/O boards • location of the ASIC interface: to be defined (likely near the DCS crates) • ASIC interface to DCS tested : 2/2003 V.Kouchpil

6. SDD DCS status - HV system (1) • System description: • 5 16-slot HV crates with up to 5 MV and 5 HV boards each • HV board: 12 channels, floating, -2.8 kV @ 3 mA (2 slots each) • MV board: 12 channels, floating, -100V @ 10 mA (1 slot each) • each SDD needs 1 MV and 1 HV channels • 1 controller per HV crate • HV Modules DCS features: • automatic switch-off on anomalous conditions (over-current, over-temperature of the module) • input for HW interlock switch-off all the channels in a crate • status registers that can be inquired by the control software • remote programming & monitoring of : voltage, current, ramp-up, ramp/down, temperature of the module V.Kouchpil

7. SDD DCS status - HV system (2) • HV prototypes and production • HV module prototypes expected in INFN-Trieste by 8/2002 • tender for the production by 12/2002 • production expected to start on 5/2003 and to last about 8 months • HV Control software: • OPC Server to ease integration in DCS (over TCP/IP or other CERN-approved field-buses) available from factory V.Kouchpil

8. SDD DCS status - Cooling (1) • System description - internal circuit: • the 14 ladders (and the 28 end-ladders) of the layer 3 are grouped in 7 sectors of 2 ladders (4 end-ladders) • the 22 ladders and the 24 end-ladders of the of layer 4 are grouped in 6 sectors of 3 (6) or 4 (8) ladders • this results into 7+6=13 cooling circuits per barrel side; each circuits has two inlets (to feed 1 ladder pipe and 1 end-ladder pipe) and one outlet (collecting the coolant from 1 ladder pipe and 1 end-ladder pipe) • for each circuit we monitor/control: • pressure at inlets and outlets : 2x13x3 = 78 analog values • temperature at inlets and outlets : 2x13x3 = 78 analog values • mass flow at inlets : 2x13x2 = 52 analog values • bypass valves to fill/empty the circuit: 2x13x2 = 52 digital values V.Kouchpil

9. SDD DCS status - Cooling (2) • System description external circuit: • it’s being defined in collaboration with the STCV group • current working hypothesis (only 2 sectors per layer)includes: • chiller • heaters for fine regulation of water temperature • circulation pump controls V.Kouchpil

10. SDD DCS status - Cooling (3) • System description - air circulation • 4 air ducts are foreseen per barrel side • detailed circuit layout still under study • preliminary list of values to be monitored per each duct • mass flow • humidity • values related to the air conditioning system • Schedule • design review for the internal circuit and air circulation: 12/2002 • external cooling circuit construction (6 months) Q3/2003 V.Kouchpil

11. SDD DCS status - Schedule • Sub-systems can be tested in the ALICE DCS environment starting on: • LV 3/2003 • End-ladder ASIC 3/2003 • HV 6/2003 • Cooling system 9/2003 • SDD DCS global tests 10/2003 • Final SDD DCS system available 5/2004 • (start of ladder construction : 6/2004) V.Kouchpil