On-Board Data Handling for the PAMELA Experiment
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On-Board Data Handling for the PAMELA Experiment. Ralf Wischnewski Roma2 & DESY-Zeuthen. Alghero, 30.9.2002. The task Space requirements Pamela CPU: PSCU On-board DAQ design Data downlink Status & Summary. The INSTRUMENT. TRD e ± ,p threshold detector.

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On-Board Data Handling for the PAMELA Experiment

Ralf Wischnewski

Roma2 & DESY-Zeuthen

Alghero, 30.9.2002


  • The task

  • Space requirements

  • Pamela CPU: PSCU

  • On-board DAQ design

  • Data downlink

  • Status & Summary

R.Wischnewski


The INSTRUMENT

TRD

  • e±,p threshold detector.

  • 9 radiator planes (Cfibres) + straws tubes (Xe/CO2).

  • Separazione 102 e/p (E > 1GeV/c).

Time-of-flight system

  • Trigger(Level-1)

  • TOF particle identification (< 1 GeV/c)

  • dE/dx

  • Plastic Scintillators + PMT

  • Time resolution ~70ps

TOF

TRD

Anticoincidence

  • Plastic scintillators + PMT

  • TrackerAccept.+BGSuppres.

TRK

Si Tracker + Magnet

  • PermantMagnet B=0.4T

  • 6 Si-planes (x & y)

  • Spatial resolution ~3m MDR = 740 GeV/c

ANTI

PSCU

Si-W Calorimetro

  • Imagining Calorimeter (e/p)

  • Resolution for e±

  • E/E = 15% / E1/2

  • 22 planes Si-X / W / Si-Y

  • 16 X0 / 0.6 0

CALO

Neutron detector

  • Energy range extention to 10 TeV (e and p)

  • 36 3He counters in a polyethylen moderator

ND

Pamela CPU

R.Wischnewski


  • Real-time response to S/C Telemetry requests

  • Quasi-autonomous experiment-control: Run / Calib / SetupChanges

  • Pamela Status Verification and Emergency / Error Response

  • Logging and optional extended debugging

  • On-Orit Debug of Soft/Hardware with uplink comands <1 kB/day

  •  needs a highly debugged & automatized system

Science Data Acquisition

  • Trigger rate: 1 Hz – few 10 Hz

  • Event size: ~5 Kbyte/event

  • Dead time ~10%  i.e. EvtR/O to CPU-MM ~ 10 ms.

Experiment Slow Control & Quality Monitoring

The Tasks (1)

R.Wischnewski


Space Requirements

  • Space Qualified Systems:

  • - Radiation hardness (SEU, Latchup)

  • - Mechanical stability (vibration & shock)

  • - Thermal stability

  • Limited:

  • Power consumption, Mass & Volume

  • Interface to Satellite CPU

  • Extended error detection

  • High redundancy design & ground-test Telemetry (downlink/uplink)

The Tasks (2)

R.Wischnewski


PAMELA STORAGE AND CONTROL UNIT

  • CPU (ERC32 SPARC V7) 17 Mips @ 24MHz

  • SRAM 4 Mbyte

  • Boot PROM

  • EEPROM1 Mbyte

  • 1553 Remote Terminal to Satellite CPU

  • 64 Kb x 16 RAM buffer

  • Logic ASIC which include PCMCIA

  • bus controller & Parallel System Bus

  • Solid State Mass Memory: 2 + 2 Gbytes

  • Pamela Interface (PIF): DMA bus controller and TAM interface

  • Telemetry & Housekeeping board: 32 outputs + 78 inputs

  • DC/DC converter integrato da 27 V a 14.4 V + 5.2 V

  • Quartz clock ± 1 ms

R.Wischnewski


PAMELA DAQ – Schematics

R.Wischnewski


FrontEnd

R/O Compress

IDAQ

MPX,Level-2 Trg

PSCU

Spacecraft

MKCMD, TeleM

CPU

CPU

CMD,Setup

CMD,Setup

PIF

Data,Status

Data,Status

MassMem

>100GB

Data

MassMem

TMTC

Trigger

16 x Error

PAMELA DAQ – Schematics

Detectors

R.Wischnewski


Data Downlink to S/C and Earth

  • Science and HK data (1-2 GB) to be transfered from Pamela to Satellite MassMemory (>100GB) every few hours.

  • Asynchronous request from Master S/C-CPU.

  • Downlink from S/C to earth during ground station passages (Moscow & Sturup/Sweden) @ 320Mbps over a few minutes.

  • Needs fast analysis for uplink response on next orbit.

  • All operations based on pre-defined absolute time schedule, arbited from S/C and uplinked from Ground.

R.Wischnewski


Pamela data path s c to ground

MM S/C

Pamela Data Path:S/C to Ground

DLink S/C

R.Wischnewski


PSCU – Engineering Model

RAM (2x2 GB)

CPU, PIF, TMTC

DCDC

The PSCU is constructed in 2 phases by LABEN/Milano:

1. Engineering Model (EM), currently under full test @ INFN

2. Flight Model (FM), under construction @ LABEN

R.Wischnewski


PAMELA ENGINEERING MODEL

  • Assembly of the Engineering Model (EM) is the major functionality and I/F test to be passed before the final Flight Model (FM) is build:

  • System compability test;

  • Mechan. & electr. interface test;

  • Test procedure definiton for ground test equipment (EGSE).

Note: The PSCU is (with Power Supply)the main Interface

between Pamela and the Satllite.

R.Wischnewski


PSCU-EM Tests

  • Basic functionality test:

  • Trigger rate 80 Hz

  • 1/10 evts transfered to CPU-RAM

  • to simulate sampled event analysis

  • Telecomand communication

  • (1553 Bus)

  • Write to PSCU MassMemory

  • and download via TAM

R.Wischnewski


PSCU TEST EQUIPMENT

  • Full functionality test of PSCU needs an

  • “Electrical Ground Support Equipment” (EGSE),

  • simulating all system interfaces:

    • power supply (27 V)

    • Control Command (ON/OFF, RESET)

    • bus 1553 for telecomands

    • telemetry

    • I-DAQ board to receive FE Comands and

      reply detector data in real time

    • monitor for PSCU electrical/thermal status

    • debugger and monitoring SW

    • simulator for Housekeeping input

    • event trigger simulation

    • science data readout (TAM)

R.Wischnewski



PSCU - ON-BOARD SOFTWARE

  • RTEMS as Operation System:

  • (Real-Time Executive for Multiprocessor systems)

    • multitasking

    • preemptive or monotonic scheduling

    • comunication zone and intertask synchronisation

    • interrupt handling

    • optional: task & interrupt priority

    • dynamic memory allocation

  • RTEMS is supported by ESA/ESTEC including Cross Compiler ERC32CC with:

  • GNU C compiler

  • Linker, assembler, archiver etc.

  • Standalone C-library

  • RTEMS real-time kernel with ERC32 BSP

  • ERC32 boot-prom utility

  • Standalone simulator ERC32

  • GNU debugger with ERC32 simulator & DDD

R.Wischnewski


Main Functional Modes and Tasks

Overview of Pamela main functional modes and parallel system tasks.

Telecomands from S/C Master CPU switch between

operation modes. Automatic-mode change is under implementation.

TMTC-Housekeeping, S/C 1553 I/F, Logging, Error check and

General Interrupt handling tasks are permanentely active.

R.Wischnewski



BEAM TEST @ CERN SPS 5-12/06/2002

e @ 20-300 GeV

p @ 300-350 GeV

PSCU Buffers are

optimized for

event size < 16 kB.

Tracker data size (compressed).

R.Wischnewski


Second Level Trigger

Trigger on IDAQ-Board

Fast DSP-rejection algorithm for

Background events, w/o PSCU.

Using:

AntiCoincidence – Veto.

But: signal rejection by back-

scattering from calorimeter.

Calorimeter - particle classification

(non-interacting, hadronic, em).

TOF - n° of hits per plane

TRACKER - n° of clusters,

no online reconstruction.

Verification with SPS/PS test beam data (2002).

R.Wischnewski


PAMELA DAQ - Summary

  • Most components of the Pamela DAQ and Slow Control are ready for system test.

  • CPU-EM in full test @ INFN; CPU-FM in production @Laben

  • Finalization of Pamela Slow & Autonomous Control Procedures

  • Next steps:

  • DAQ / FE-board system test with & S/C-Simulator in Rome (12/2002)

  • Deliver Pamela-EM to Russia for S/C EM test (1/2003)

  • Integration of Pamela FM with FM-PSCU, physics test, delivery to Russia (5/2003).

R.Wischnewski


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