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The Electronics System of the ALFA Forward Detector for Luminosity Measurements in ATLAS

The Electronics System of the ALFA Forward Detector for Luminosity Measurements in ATLAS. Presenter : F . Anghinolfi B. Allongue 1 , J. Alozy 1 , G. Blanchot 1 , S. Franz 1 , W . Iwanski 1 , V. Lorentzen 2 , B. Lundberg 3 , S . Jakobsen 4 , K. Korcyl 5.

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The Electronics System of the ALFA Forward Detector for Luminosity Measurements in ATLAS

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  1. The Electronics System of the ALFA Forward Detector for Luminosity Measurements in ATLAS Presenter : F. Anghinolfi B. Allongue1, J. Alozy1, G. Blanchot1, S. Franz1, W. Iwanski1, V. Lorentzen2, B. Lundberg3, S. Jakobsen4, K. Korcyl5 1CERN, 2HIST Trondheim , 3Lund University, 3NPI Copenhagen, 5INP PAN, Cracow TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  2. ALFA LHC Mechanics Detector Electronics TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  3. ALFA : Absolute Luminosity Measurement One “UP” One “DOWN” UP Each “RP” is a 20x20mm mini tracker made of 10 planes of staggered scintillating fibers in U and V directions, plus 2 scintillating plates covering the tracking area for producing trigger signals Two small trackers symmetrically placed around the proton beam, the detector to beam distance can be as low as 1.5mm. Measure the elastic beam scattering at very low distance of the beam. DOWN TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  4. In alcove : LV power supplies USA15 : HV units DCS control & monitor ROD LV PFC and control CTP In alcove : LV power supplies USA15 counting room RR13 alcove RR17 alcove ALFA R/O electronics 250m + through tunnel & galleries 250m + through tunnel & galleries Up Down Up Down Up Down Up Down Each station (A, B): 2 pots (up and down) 2 readout systems (PMF + Motherboard) 1 (main) Patch Box 2 HV dispatchers For A&B : 1 optolink dispatcher Each station (A, B): 2 pots (up and down) 2 readout systems (PMF + Motherboard) 1 (main) Patch Box 2 HV dispatchers For A&B : 1 optolink dispatcher TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  5. In alcove : LV power supplies USA15 : HV units DCS control & monitor ROD LV PFC and control CTP local tunnel USA15 counting room RR13/17 alcove 380V DC ALFA R/O electronics Maraton Control LV voltages Patch Box B Patch Box A Control & Monitoring (DCS) HV Patch Opto Patch TTC, Data Down B Down A Up B Up A TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  6. USA15 : HV units DCS control & monitor ROD LV PFC and control CTP local tunnel USA15 counting room ALFA R/O electronics TRIGGER SIGNALS 2 overlap Trigger Down B Down A 2 overlap Trigger Main Trigger Main Trigger 2 overlap Trigger Up B Up A 2 overlap Trigger Main Trigger Main Trigger TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  7. On Each Pot FE structure : PMF ALFA R/O electronics PMT readout L1 Buffer & serializer 40Mb/s Serializer 1.2Gb/s ROD Track Data Flow PMT readout Registers SPI interface DCS Configuration Flow “Lucid” PMF PMT readout Line Drivers CTP, Trigger Logic Mask/AND Trigger Flow TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  8. Tracking Data flow on each detector FE structure : PMF (23x) On Motherboard Kapton cable PMT readout L1 Buffer & serializer 40Mb/s Serializer 1.2Gb/s Data Flow ALFA R/O electronics Trigger 64 channels 23x Amplifier Discriminator Buffer From PMT To USA15 Trigger Latency Serializer A D Buffer Serializer MAROC2 ASIC ALFA-R FPGA Fast Shaper Per channel adjustable Gain Variable Threshold Trigger Latency Buffer & Ser. MAROC2 configuration ALFA-M FPGA Buffer & Ser. Data Format ALFA-R Data Flow control SPI interface TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  9. ALFA R/O electronics Aimed for compact, removable electronics Minimal cabling constraints (from USA to RP) FE Electronics centered around the MAROC2 ASIC developed by LAL/Orsay for MA-PMT readout systems Partial Radiation Hardness (Power supplies and regulation, ELMB, TTC GOL QPLL etc …) TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  10. Detector and Front-End Parts MAROC side ALFAR FPGA side 3 stacked PCB mounted on the MAPAMT pins : HV distribution, signal distribution, active layer (pictures on the right) TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  11. Detector View • 10 tracking modules, 3 overlaps and 2 triggers • 1460 fibres and trigger lightguide bundles to optical connectors • 2 LED and 2 PT100 sensor TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  12. “Motherboard” ALFA Electronics on each pot 23 PMFs : 5 rows 1460 readout channels Targets : Collects and serialize data from 23 PMFs Long distance links to USA15 (no repeaters) Independent control and monitor through ELMB Removed from tunnel when not in use Detector TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  13. Functions distributed in the front-end electronics x1 DataReady 2 Trigger Main + 2 Trigger OVLP DataOut+BCR+ECR ALFA_T DataReq L1A On Mezzanine L1A To GOL ALFA_T functions : Local Trigger Pattern Main Trigger Charge Trigger rate counter LED pulser ALFA_M On Motherboard x23 DataReady 64 Tracks DataOut+BCR+ECR ALFA_M functions : SYNC & SEND DATA Track Detector Charge measurement * SPI interface (PVSS control) ALFA_R DataReq SPI On PMF L1A ALFA_R functions : Tracking Pattern Track Detector Charge measurement * ELMB/PVSS functions : MAROC configuration Channel masking LED Pulse parameters Trigger pattern configuration Latency adjustment Monitoring ELMB * : Special run, very low trigger rate, standalone ALFA, special data format TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  14. Motherboard Main Functionalities • System clocked at 40MHz, few KHz L1 rate • 11A, 5V (with 23 PMFs) 5 PMFs POWER Motherboard MB1 connector 5 PMFs MB2 connector ALFA M FPGA Serial links 4 PMFs MB3 connector MB4 connector 5 PMFs MB5 connector GOL chip ROD (USA15) 4PMFs SPI QPLL DATA TTC Module (USA15) GOL connector TTC rx ELMB TTC CAN BUS CAN BUS connector TTC Connector 23 PMFs for measurement with 64 pixels >> 64 bits of data for each PMF PMF passes its raw data serially to the ALFA-M controller ALFA M collects raw data with the same L1ID and then transmit it through a GOL link to the ROD TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  15. Motherboard Details Capability of track charge measurement (to measure charge collection degradation) PMFs Row PMFs Row PMFs Row PMFs Row PMFs Row TTCR Analog Analog Analog Analog Analog DataReady/Out DataReady/Out DataReady/Out DataReady/Out DataReady/Out Interface to Trigger Mezzanine PMF config (SPI) PMF config (SPI) PMF config (SPI) PMF config (SPI) PMF config (SPI) ADC ADC ADC ADC ADC SPI QPLL (40MHz LVDS) DCS CAN bus SPI Bus (from MB) Ports ELMB OptoIolation FPGAALTERA EP3C40F780C6N Trigger Pattern (LVDS @ 40 MHz) Trigger Data (LVDS @ 40 MHz) Spare IO (8) Spare LVDS (3) Data Opto link GOL VCSEL Monitors QPLL TTCRx 50MHz Clock distribution +7V (MB)+5V (MB) Regulators References Temp probe Pin Diode TWEPP 2011 F. Anghinolfi CERN/PH/ESE Optolink

  16. Trigger Mezzanine Functionalities Main1 Trigger Mezzanine Main Trigger PMF OVLP1 Trigger OVLP Trigger PMF ALFA T FPGA Main2 Trigger Main Trigger PMF OVLP Trigger PMF OVLP2 Trigger Test LEDs (2) Drivers SPI Main Trigger (1) OVLP Trigger (2) DATA Mother Board MB connector MB connector POWER 4 “LUCID” PMFs for Trigger charge measurement and time detection Triggers Outputs are programmable combination of Trigger inputs (2 main, 2 OVLP) Two programmable pulse generators for in-detector test LEDs TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  17. Trigger Mezzanine Details Interface Interface Capability of trigger charge measurement : the trigger charge is measured and transmitted at every L1, together with tracking data and the trigger pattern Interface to “LUCID” PMFs (LUND Devlpt.)Two PMFs plugged on the mezzanine;Two interface holding lemo inputs and attenuators on top of LUCID PMFs. PMF LUCID 1 PMF LUCID 2 Trig1,2 Trig3,4 Analog Analog ADC ADC PMFConfig PMF Config Main Trigger Air-core QPLL (40MHz LVDS) Overlap 1 SPI Bus (from MB) NIM Drivers OVL1 Overlap 2 Trigger Pattern (LVDS @ 40 MHz) FPGAALTERA EP3C25F256CN OVL2 Trigger Data (LVDS @ 40 MHz) Spare IO (8) Spare LVDS (3) LED Pulse LED1 LED Driver DAC LED2 Interface to MB:Two connectors to bring power and to interface with ALFA-R: clock, config bus, trigger pattern, qdc outputs;Spare single ended and LVDS IOs. Regulators +7V (MB)+5V (MB) TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  18. Trigger Mezzanine Details (2) • The Trigger mezzanine contains the circuits for : • LED Pulsers (2 LEDs installed in each pot for light excitation) • Trigger Logic (trigger signal can be a combination of the 4 trigger sources) • Main Trigger charge measurements • Triggers signal processed by the MAROC2 chip, mounted on the LUCID PMF = LEMO connector Adaptor Triggers Inputs Triggers Inputs Main Trigger Overlap 1 Overlap 2 LED Pulse 1 LED Pulse 2 Lucid PMF With Maroc Mezzanine MB Connectors TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  19. ALFA “Motherboard” implementation Trigger Mezzanine Trigger Mezzanine FPGA ELMB : control and monitoring ELMB Power Conn. GOL link TTC Fiber ELMB Conn.1 ELMB Conn.2 Temp Connector TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  20. ALFA Electronics implementation PMT, PMF and kaptons are enclosed in a dark box, the motherboard carrying other elements (ELMB, trigger mezzanine) is vertical on the edge Partial view of the kaptons cabling, PMF are located inside, HV connectors on the right trigger signals on the left. White wires are the internal HV lines. TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  21. Electronics commissionning Light ~1p.e. HV 950V No light HV ON Electronics commissioning was performed on the 8 systems just before installation and repeated after installation TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  22. Electronics commissioning Electrical test stand : one charge signal injected in one channel. The method was used to verify the channel mapping for DAQ reconstruction LED test stand : one long distance LED (about 1m and light diffuser) is used to illuminate all channels. In this plot one PMF “row” is not operational, as well as a 3 other PMTs (HV off) TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  23. Electronics commissioning Internal LED pulser : light is passing through leaks in the optical connectors. More light at the center (where the LED is located). Test on one RP system after its installation in the tunnel. TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  24. Electronics commissioning Internal LED pulser: ON LINE MONITORING Top left figure : on-line hits display Top right figure : Number of hits per layer Left : number of layer with hits TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  25. Electronics commissioning Plots are Courtesy of ALFA soft team TOP : first tracks reconstruction, after installation. LHC normal run, ALFA in “garage” mode Top right : Accumulated hits display on one detector (20 layers), LHC normal run, ALFA in garage mode Bottom right figure : Reconstructed tracks projection. Double hits reconstruction show up reco outside of the detector area TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  26. Electronics commissioning Detector layer hits during LHC runs, 20 layers in one RP, garage position TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  27. Electronics commissioning Trigger signals Charge measurements (internal LED) for the 8 pots TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  28. Installation in LHC Tunnel TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  29. ALFA Electronics • All 8 pots fully operational right after installation in January 2011 • The track signals charge measurement will be installed during 2011 winter shut down (firmware update) • Connections to the ATLAS CTP and trigger signals timing adjustment performed after installation (commissioning still going on, insertion to the Level 1 ATLAS trigger system) • Some specific LHC runs with low beta angle are used to commission the detector for physics (in coordination with TOTEM) TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  30. ALFA ELECTRONICS TWEPP 2011 F. Anghinolfi CERN/PH/ESE SPARES

  31. Data readout : modified modes DataReq L1 Event Maroc Delay Pipelined track hit Buffer ALFAR ALFAR SER. ALFAR Track hit To MB Maroc + combinatorialDelay Pipelined TRIG hit Buffer ALFAT ALFAT SER. To MB TRIG hit ALFAT Maroc + MUX + ADC Delay Pipelined TRIG_ADC hit Buffer ALFAT ALFAT TRIG hit Problem here : the interval is made of 3 successive functions : 1 – MAROC (50ns) 2 – Scan channels (up to 5 = 5us ?) 3 - ADC (500ns)  It may exceed the latency time (?) BC tag, L1 tag Warning . TheMUX ADC delay is different for the two QDC channels ! TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  32. Trigger QDC readout : modified modes 64 bits (4 groups of 16 bits) Trigger Pattern Trigger Charge 1 Trigger Charge 2 Trigger Counters BCID/L1ID 12 significant bits 12 significant bits 16 significant bits 16 significant bits T.Count number of bits : Hypothesis : for an average count per ms the maximum theoritical count is 40K. 16 bits is 65K. There is no minimum count limit. A realistic number would be 200 (5Khz hit rate, no background) TWEPP 2011 F. Anghinolfi CERN/PH/ESE

  33. Electronics commissionning No light HV ON Light ~1p.e. HV 950V Light ~1p.e. HV 900V TWEPP 2011 F. Anghinolfi CERN/PH/ESE

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