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1 MICE Tracker MICE Tracker Update Update M. Ellis M. Ellis UKNFIC Meeting UKNFIC Meeting 25 25 th th August 2005 August 2005

1 MICE Tracker Update M. Ellis UKNFIC Meeting 25 th August 2005

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Page 1: 1 MICE Tracker Update M. Ellis UKNFIC Meeting 25 th August 2005

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MICE Tracker UpdateMICE Tracker Update

M. EllisM. Ellis

UKNFIC MeetingUKNFIC Meeting

2525thth August 2005 August 2005

Page 2: 1 MICE Tracker Update M. Ellis UKNFIC Meeting 25 th August 2005

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Story so far...Story so far...

2003/2004: Three station prototype 2003/2004: Three station prototype assembled and operated at D0 using D0 assembled and operated at D0 using D0 equipment.equipment.

February 2005: Sci Fi/VLPC technology February 2005: Sci Fi/VLPC technology validated for MICE trackervalidated for MICE tracker

March – August: Work on new hardware March – August: Work on new hardware (4(4thth station, cryo-cooler & cryostat, AFEII station, cryo-cooler & cryostat, AFEII prototype, Avnet, etc) for MICE tracker, prototype, Avnet, etc) for MICE tracker, leading towards:leading towards:

October 2005: Test beam at KEKOctober 2005: Test beam at KEK

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Previous testPrevious test

Used a D0 test cryostat, able to hold two Used a D0 test cryostat, able to hold two VLPC cassettes (4 AFE boards).VLPC cassettes (4 AFE boards).

Only had access to two AFE (version 1) Only had access to two AFE (version 1) boards, so readout 1024 channels.boards, so readout 1024 channels.

Software used was Excel/Visual Basic Software used was Excel/Visual Basic code in regular use at D0 for testing of code in regular use at D0 for testing of AFE and calibration of VLPCs/AFE AFE and calibration of VLPCs/AFE boards.boards.

Need MICE specific hardware and Need MICE specific hardware and software!software!

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Fourth StationFourth Station

New specification (changed fibre pitch).New specification (changed fibre pitch). Improved optical connector design.Improved optical connector design. Station constructed at IC and new tracker Station constructed at IC and new tracker

assembled in dark-room at IC.assembled in dark-room at IC. CMM machine used to determine station CMM machine used to determine station

alignment.alignment. Complete tracker made light-tight and Complete tracker made light-tight and

shipped to Fermilab..shipped to Fermilab..

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Analog Front-End (AFE) Version 2Analog Front-End (AFE) Version 2

New design of the readout electronics for New design of the readout electronics for VLPCs.VLPCs.

Step along the path to AFEII-t, which will Step along the path to AFEII-t, which will add the ability to record TDC information add the ability to record TDC information for each hit.for each hit.

Prototype AFEII boards have been used Prototype AFEII boards have been used for the first time at D0 for work on the for the first time at D0 for work on the MICE tracker.MICE tracker.

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MICE tracker readout with VLPCsMICE tracker readout with VLPCs

Tracker

Waveguides

AFEII boards

VLPC cryostat

LVDS cables to VLSB module

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VLPC operating conditionsVLPC operating conditions Temperature needs to be kept at 9.00 Temperature needs to be kept at 9.00 ± 0.02 K.± 0.02 K. Cryostat/cryo-cooler combination controlled to Cryostat/cryo-cooler combination controlled to

hold cold-end at 6.8 K with heater on a feed-hold cold-end at 6.8 K with heater on a feed-back loop.back loop.

VLPC cassettes have 8 heaters, controlled VLPC cassettes have 8 heaters, controlled through the AFE board, that bring the through the AFE board, that bring the temperature up to 9.0 K and maintain it.temperature up to 9.0 K and maintain it.

Select appropriate bias voltage to optimise gain Select appropriate bias voltage to optimise gain vs noise rate. Optimisation depends on expected vs noise rate. Optimisation depends on expected data-taking rate.data-taking rate.

Bias voltage is applied through the AFE board.Bias voltage is applied through the AFE board.

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LVDS / VLSBLVDS / VLSB Low Voltage Differential Signaling (LVDS) is Low Voltage Differential Signaling (LVDS) is

used to transfer the ADC data from an AFE used to transfer the ADC data from an AFE board to a VME memory module.board to a VME memory module.

The cable is connected to the AFE board The cable is connected to the AFE board through the AFE back-plane.through the AFE back-plane.

VME LVDS Serdes Buffer (VLSB) boards are VME LVDS Serdes Buffer (VLSB) boards are VME devices containing memory and an LVDS VME devices containing memory and an LVDS interface.interface.

When the AFE board passes through a data-When the AFE board passes through a data-acquisition cycle, the ADC values are sent to the acquisition cycle, the ADC values are sent to the corresponding VLSB board and can then be corresponding VLSB board and can then be accessed over a VME/PCI interface (BIT3).accessed over a VME/PCI interface (BIT3).

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LVDS and VLSBLVDS and VLSB

Trigger/Timing

LVDS cables

VME/PCI

1553

VLSB modules

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InitialisationInitialisation

AFE boards need to be initialised before AFE boards need to be initialised before data-taking can begin. data-taking can begin.

This is achieved through the Mil-1553 This is achieved through the Mil-1553 interface. One 1553 can control all 4 interface. One 1553 can control all 4 boards on a MICE 2-cassette cryostat.boards on a MICE 2-cassette cryostat.

Initialisation includes:Initialisation includes: FPGA power on, programming and testingFPGA power on, programming and testing Trigger Pipeline (TRIP) chip programmingTrigger Pipeline (TRIP) chip programming VLPC bias voltage and temperature controlVLPC bias voltage and temperature control

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Timing and TriggeringTiming and Triggering FPGAs require a 53 MHz clock.FPGAs require a 53 MHz clock. AFE board has a number of operating modes:AFE board has a number of operating modes:

InitialiseInitialise AcquireAcquire DigitiseDigitise ReadoutReadout

The clock and mode control used to be provided The clock and mode control used to be provided by a “SaSEQ” board, now provided by an by a “SaSEQ” board, now provided by an “Avnet” board.“Avnet” board.

Avnet is able to control all 4 boards on a MICE Avnet is able to control all 4 boards on a MICE cryostat at once and requires no software cryostat at once and requires no software intervention to perform a intervention to perform a trigger/acquire/digitise/readout cycle.trigger/acquire/digitise/readout cycle.

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Avnet BoardAvnet Board

Connection to AFE Backplane

External trigger

RS232 cable

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Readout SequenceReadout Sequence External trigger is generated (e.g. cosmic ray trigger External trigger is generated (e.g. cosmic ray trigger

scintillators).scintillators). Trigger is ANDed with a pattern that matches the Trigger is ANDed with a pattern that matches the

tevatron bunch structure (needed for now, will be tevatron bunch structure (needed for now, will be replaced in later use for MICE).replaced in later use for MICE).

If trigger is accepted, signal is passed to Avnet board.If trigger is accepted, signal is passed to Avnet board. Avnet board causes the AFE boards to acquire, digitise Avnet board causes the AFE boards to acquire, digitise

and readout the data to the VLSB modules and then sets and readout the data to the VLSB modules and then sets the AFE boards ready for the next trigger.the AFE boards ready for the next trigger.

Data is retrieved from the VLSB modules over the Data is retrieved from the VLSB modules over the VME/PCI interface to a Linux PC.VME/PCI interface to a Linux PC.

Timing is critical as the trigger signal to the Avnet board Timing is critical as the trigger signal to the Avnet board needs to arrive 7 “bunch crossings” after the light from needs to arrive 7 “bunch crossings” after the light from the tracker arrives at the VLPCs.the tracker arrives at the VLPCs.

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Progress at FNALProgress at FNAL

After a lot of problems, have managed to After a lot of problems, have managed to operate the MICE cryostat with 4 AFEII boards.operate the MICE cryostat with 4 AFEII boards.

Linux software written for MICE can now perform Linux software written for MICE can now perform almost all of the initialisation sequence and was almost all of the initialisation sequence and was used for all data-taking.used for all data-taking.

Took data with an LED pulser attached to each Took data with an LED pulser attached to each VLPC cryostat in turn and then connected the VLPC cryostat in turn and then connected the tracker and collected a few thousand cosmic ray tracker and collected a few thousand cosmic ray triggers!triggers!

Tracker system is currently on its way to Japan...Tracker system is currently on its way to Japan...

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G4MICEG4MICE

Several new features have been Several new features have been implemented in preparation for the use of implemented in preparation for the use of G4MICE in data-taking and analysis of the G4MICE in data-taking and analysis of the KEK data:KEK data: User applicationsUser applications A few SciFi classes are now persistentA few SciFi classes are now persistent Interface to CERNLIB to make PAW Interface to CERNLIB to make PAW

histograms, etchistograms, etc Code to decode raw data formatCode to decode raw data format

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Pedestal WidthsPedestal WidthsMade with G4MICE

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Calibrations – Cassettes 105 & 111Calibrations – Cassettes 105 & 111

One channel from each cassette. Note 105 has a gain of ~20k and 111 has a gain of ~40k

Made with G4MICE

10 PE 10 PE

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High Gain Cassette – More LightHigh Gain Cassette – More Light

Made with G4MICE

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Calibration ResultsCalibration ResultsMade with G4MICE

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First look at Cosmic dataFirst look at Cosmic data

Still require work on “cabling” information Still require work on “cabling” information (i.e. which board/channel/MCM is (i.e. which board/channel/MCM is connected to which Station/Plane/Fibre)connected to which Station/Plane/Fibre)

First look involves selecting channels with First look involves selecting channels with a good calibration and plotting ADC a good calibration and plotting ADC distribution in units of Photo Electrons.distribution in units of Photo Electrons.

More refined analysis requires use of More refined analysis requires use of G4MICE (coming very soon...)G4MICE (coming very soon...)

Light is seen coming from the tracker:Light is seen coming from the tracker:

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Cosmic Ray dataCosmic Ray data

Pedestals subtractedPedestals subtracted No Common Mode No Common Mode

Noise subtractionNoise subtraction Gains used to express Gains used to express

ADC as PEADC as PE No tracking or other No tracking or other

cutscuts All channels with a All channels with a

signal above 2.0 PE signal above 2.0 PE are shownare shown

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Next StepsNext Steps

Work ongoing in G4MICE to allow all Work ongoing in G4MICE to allow all future calibration/alignment and analysis to future calibration/alignment and analysis to be performed using G4MICE.be performed using G4MICE.

Need to sort out channel map and attempt Need to sort out channel map and attempt tracking using G4MICE.tracking using G4MICE.

Prepare Linux software to control Avnet Prepare Linux software to control Avnet board and finalise newer TRIP board and finalise newer TRIP programming scheme (much faster).programming scheme (much faster).

Take data at KEK...Take data at KEK...