ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari SSD (Silicon Strip Detector) SDD (Silicon Drift Detector) SPD (Silicon Pixel Detector) Detector Control System for the Silicon Pixel Detector

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari 2 layers splitted in 10 sectors each sector carries on 6 staves: 4 outer layer + 2 inner layer each stave splitted in 2 half-stave half-stave basic module

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

SPD Basic Building Blocks 32 columns 256 rows Ladder 2: mmLadder 1: mm Half stave ~193 mm 425  m 50  m Pixel Cell Frontend chip Pixel detector Carrier bus Power supply ~1m 1 data and 2 control links (~200m) PCMCM 16.8 mm mm

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Electronics System Block Diagram

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Services Cooling LV power requirements –LV currents each half stave V ≈ 1.6V nominal) –I analog ≈ 4A, I digital ≈ 3A –Conductor (Cu) width: 2 mm strip on kapton, thickness ≈ 0.20mm ≈ 1.4% X 0 resistance ≈ 40 mOhm –Regulation and filtering of power supplies (space/cooling constraints !) rad-hard linear regulator chip (P. Jarron) at patch-panels filtering with passive components on bus Fibre-optic links 3 (possibly 4) fibres each half-stave single fibre diameter (tight jacket) ≈ 0.9mm, fibre ribbon pitch = 0.25mm

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Overview of voltage and current requirements per half-stave Base unit: 1 half-stave = 10 pixel chips SPD (Silicon Pixel Detector) => 120 half-staves Separate analog, digital, detector bias, MCM power supplies Necessary channels: analog power + ground + sense wires digital power + ground + sense wires detector bias + ground MCM power + ground + sense wires

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Possible solutions All power supplies outside the pit distance from detectors => 200 m Power supplies for analog electronics inside the pit distance from detectors => m Power supplies for digital electronics and detector bias outside the pit distance from detectors => 200 m All power supplies inside the pit distance from detectors => m

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari ALICE Experiment

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari The NA57 slow control system (CAEN SY527)

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari All power supplies outside the pit (distance from detector => 200 m) - easy to replace the damaged board during the run (not on-board spare channels) - no radiation and magnetic field problems - increased length and cross section of the analog power cables - voltage drop on the analog power cable CAEN SY1527 (for all power supplies) outside the pit Shoebox with capacitive filter 200 m m SPD analog power digital power detector bias

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Analog power supplies inside the pit (distance from detector => 40–50 m); digital and detector bias power supplies outside the pit (distance from detector => 200 m) - spare analog channels => necessary rele’ system - no digital and bias spares CAEN SY1527 (digital power and detector bias) outside the pit CAEN SY1527 (analog power) inside the pit Shoebox with capacitive filter and control logic m SPD 40 m 200 m

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari PIXEL m Several cables under test Line impedance adjust: solution under study from CAEN to make use of sense wires or line impedence adjustment

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Cost estimate 1st solution (all PS outside) 3 CAEN SY1527 mainframe + 9 A1532 (optional P.S.) 60 KChF programmable board A1517B (5V/3.6A, 14 ch) 137 KChF programmable board A1519B (250V/1mA, 28 ch) 48 KChF Cable for digital power (10.5 ChF/m) 42 KChF Cable for detector bias (5.53 ChF/m) 11 KChF Cable for analog power (10.5 ChF/m) 63 KChF TOTAL 360 KChF 2nd solution (analog PS inside and digital PS outside) 4 CAEN SY A KChF programmable board A1517B (5V/3.6A, 14 ch)159 KChF programmable board A1519B (250V/1mA, 28 ch) 48 KChF Cable for digital power (10.5 ChF/m) 42 KChF Cable for detector bias (5.53 ChF/m) 11 KChF Cable for analog power (10.5 ChF/m) 10.5 KChF TOTAL KChF

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Test System for CAEN SY1527 Test System available in Bari Lab: CAEN mainframe SY1527 A1734N board (12 channels, 250 to 6KV, 7mA to 100 mA) Ethernet “TCP/IP” CAEN OPC server installed on pcal04 OPC client via TCP/IP => under study (first tests performed with an OPC client from National Instruments installed on pcal01)

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Example of remote monitoring This OPC client from National Instruments runs on a remote workstation (pcal01)

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari All power supplies inside the pit (distance from detector => m) - reduction cost and length of the conventional analog power cables - reduced voltage drop on the analog power cable - no access during the run - impossible to replace damaged board, necessary spare channels for the analog-digital power supplies and detector bias => notable cost increase Alternative solution --->Adoption of Voltage Regulators with standard powerful power supply Power Supply: ELIND 30KL 38/80 autoranging (0-30 V, 0-80 A) Voltage regulator: L4913 (P. Jarron), others

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Solution based on Voltage Regulators

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Main parameters of the DCS for the ITS Pixel (1)

ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari Main parameters of the DCS for the ITS Pixel (2) N.B. All analog channels