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


The electronics system of the alfa forward detector for luminosity measurements in atlas

ALFA

LHC

Mechanics

Detector

Electronics

TWEPP 2011 F. Anghinolfi CERN/PH/ESE


The electronics system of the alfa forward detector for luminosity measurements in atlas

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


Alfa r o electronics

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


Alfa r o electronics1

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


Alfa r o electronics2

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


Alfa r o electronics3

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


Alfa r o electronics4

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


Alfa r o electronics5

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


Detector and front end parts

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


The electronics system of the alfa forward detector for luminosity measurements in atlas

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


Alfa electronics on each pot

“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


Functions distributed in the front end electronics

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


Motherboard main functionalities

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


The electronics system of the alfa forward detector for luminosity measurements in atlas

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


Trigger mezzanine functionalities

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


The electronics system of the alfa forward detector for luminosity measurements in atlas

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


The electronics system of the alfa forward detector for luminosity measurements in atlas

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


Alfa motherboard implementation

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


Alfa electronics implementation

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


Electronics commissionning

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


Electronics commissioning

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


Electronics commissioning1

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


Electronics commissioning2

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


Electronics commissioning3

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


Electronics commissioning4

Electronics commissioning

Detector layer hits during LHC runs,

20 layers in one RP, garage position

TWEPP 2011 F. Anghinolfi CERN/PH/ESE


Electronics commissioning5

Electronics commissioning

Trigger signals Charge measurements (internal LED) for the 8 pots

TWEPP 2011 F. Anghinolfi CERN/PH/ESE


Installation in lhc tunnel

Installation in LHC Tunnel

TWEPP 2011 F. Anghinolfi CERN/PH/ESE


Alfa electronics

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


Alfa electronics1

ALFA ELECTRONICS

TWEPP 2011 F. Anghinolfi CERN/PH/ESE

SPARES


Data readout modified modes

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


Trigger qdc readout modified modes

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


Electronics commissionning1

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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