SSD (Silicon Strip Detector) SDD (Silicon Drift Detector) SPD (Silicon Pixel Detector)

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

2. 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

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

4. SPD Basic Building Blocks 1 data and 2 control links (~200m) Half stave ~193 mm Ladder 2: 70.72 mm Ladder 1: 70.72 mm 16.8 mm 32 columns Pixel detector Power supply ~1m PCMCM Frontend chip Carrier bus 256 rows 15.86 mm Pixel Cell 50 m 425 m ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

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

6. 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% X0 • 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

7. 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: • - 120 analog power + ground + sense wires • - 120 digital power + ground + sense wires • - 120 detector bias + ground • - 120 MCM power + ground + sense wires ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

8. Possible solutions • All power supplies outside the pit distance from detectors => 200 m • Power supplies for analog electronics inside the pit distance from detectors => 40 - 50 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 => 40 - 50 m ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

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

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

11. 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 analog power digital power detector bias CAEN SY1527 (for all power supplies) outside the pit 200 m SPD Shoebox with capacitive filter 4 - 5 m ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

12. 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 200 m Shoebox with capacitive filter and control logic SPD CAEN SY1527 (analog power) inside the pit 4 - 5 m 40 m ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

13. Several cables under test • Line impedance adjust: solution under study from CAEN to make use of sense wires or line impedence adjustment 40-50 m PIXEL 40-50 m ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

14. Cost estimate 1st solution (all PS outside) • 3 CAEN SY1527 mainframe + 9 A1532 (optional P.S.) 60 KChF • 18 + 1 programmable board A1517B (5V/3.6A, 14 ch) 137 KChF • 5 + 1 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 SY1527 + 12 A1532 80 KChF • 19 + 3 programmable board A1517B (5V/3.6A, 14 ch) 159 KChF • 4 + 1 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 350.5 KChF ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

15. 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) Test System for CAEN SY1527 ALICE DCS Workshop 28/29 May 2001 Vito Manzari, INFN Bari

16. 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

17. All power supplies inside the pit (distance from detector => 40-50 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

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

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

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