FMD – Forward Multiplicity Detector

1. FMD – Forward Multiplicity Detector ALICE Meeting on Rad. Tolerant Electronics CERN, 30 August 2004 Børge Svane Nielsen Henrik Bertelsen Niels Bohr Institute • Silicon strip sensors: Hamamatsu • Preamp-shaper chips: VA1_ALICE in production • Hybrids: VA1_ALICE with passive components • FMD Digitiser Card: Design based on TPC FEC and ”known” VA1 read-out protocol • Read-out and Controls: TPC RCU Børge Svane Nielsen, NBI

2. Five FMD Rings FMD 2 ITS FMD 3 FMD 1 FMD Digitizer Hybrid and sensor Support plates Børge Svane Nielsen, NBI

3. Radiation environment Doses and Fluences in Central ALICE (10 years running): Belle measurements Doses in FMD: =0.33 Mrd Børge Svane Nielsen, NBI

4. FMD sensors 512 strips 256 strips Inner module Si strip sensors from 6” wafers. Manufactured by Hamamatsu. Outer module Børge Svane Nielsen, NBI

5. Sensor design • Design very similar to • CMS sensor, except: • geometry • “standard” ~ 5kcm • high resistivity silicon Børge Svane Nielsen, NBI

6. IN COUNTING ROOM NEAR PATCH PANEL ON DETECTOR FMD Module FMD Digitizer RCU Front-end bus ~ 3 m Analog serial link (10 MHz)  0.5 m ALTRO (16 ch) Data Proc. and Memory  16 Bus controller ( conf. & R/O) DDL ALTRO (16 ch) DAQ int. (DDL-SIU) BOARD ALTRO (16 ch) DCS BOARD controller DCS int. (Ethernet) CTRL Local Monitor and Control TTC-RX TTC optical Link (Clock, L1 and L2 ) VA Read-out CTRL Trigger int. (TTC-rx) Control Network (I2C-serial link) VA read-out control Trigger L0 1 ring: 10/20 modules 2 Digitizers 1 RCU per ring system Full FMD: 70 modules 10 Digitizers 3 RCU’s BSN, 17 Feb 2004 Read-out and Controls Børge Svane Nielsen, NBI

7. Custom preamp-shaper chip: VA1_ALICE in production VA1_ALICE a VA1 in 0.35 µm technology 45 m input pitch Børge Svane Nielsen, NBI

8. VA1_ALICE noise simulations 3 nA Leakage current Børge Svane Nielsen, NBI

9. Hybrids Inner module VA1_ALICE (128 channels) pitch adapter (ceramics) passive components bonding Si sensor Connectors for power, control, read-out, bias Børge Svane Nielsen, NBI

10. FMD Digitizer Multiplexed read-out 128 channels @ 10 MHz Differential receiver + Level shift ALTRO-RCU Front-end bus  3 m  16  16 ALTRO (16 ch) FE preamps  16  16 ALTRO (16 ch)  16  16 ALTRO (16 ch) Control Network (I2C-serial link) CLK (10 MHz) VA read-out control Read-out Controller (FPGA) Trigger LVL0 Bias settings (DAC) VA biases JTAG LV power -2.0 V +1.5 V Power regulators VA power FMD Digitizer Børge Svane Nielsen, NBI

11. FMDD study set-up Børge Svane Nielsen, NBI

12. RCU location DAQ RCU Patch panel ~ 3 m FMDD “TPC” Front-end bus and Control bus Børge Svane Nielsen, NBI

13. IN COUNTING ROOM ON DETECTOR NEAR PATCH PANEL FMD Module Front-end bus ~ 3 m Analog serial link (10 MHz)  0.5 m FMD Digitizer RCU ALTRO (16 ch) Data Proc. and Memory  16 Bus controller ( conf. & R/O) DDL ALTRO (16 ch) DAQ int. (DDL-SIU) BOARD ALTRO (16 ch) DCS BOARD controller DCS int. (Ethernet) CTRL Local Monitor and Control TTC-RX TTC optical Link (Clock, L1 and L2 ) VA Read-out CTRL Trigger int. (TTC-rx) Control Network (I2C-serial link) VA read-out control Trigger L0 1 ring: 10/20 modules 2 Digitizers 1 RCU per ring system Full FMD: 70 modules 10 Digitizers 3 RCU’s BSN, 17 Feb 2004 Read-Out modules Børge Svane Nielsen, NBI

14. Summary • Electronics components of FMD: • Preamp-shaper-multiplexer on hybrid: VA1_ALICE in 0.35 µm technology by IDEAS, Oslo Rad.level 200-3300 Gy • FMD Digitizer: use ALTROs and TPC FEC schematics + VA1 read-out protocol with common 10 MHz clock, to be built at NBI, Copenhagen Need to be aware of higher rad. levels than at TPC • Rad.level 100-1000 Gy • RCU identical to the one from TPC and PHOS • Rad.level 10-100 Gy Børge Svane Nielsen, NBI