Glast italian software meeting, Udine 01/30/2003 Luca Latronico The GLAST online software Gamma-ray Large Area Space Telescope Luca Latronico Glast Italia.

Luca Latronico Glast italian software meeting, Udine 01/30/2003

The GLAST online software

Gamma-ray Large Area Gamma-ray Large Area Space TelescopeSpace Telescope

Luca Latronico

Glast Italia software meetingUdine 31-31/1/2003

what is the online software in GLAST LAT hardware and DAQ core software architecture (class hierarchy) DAQ/online roadmap: use and evolution of the software tools (Python, Qt, Hippodraw) some tkr preliminary examples/results afternoon tutorial


Online software – what is it for?

Data AcQuisition:•test LAT hdw•calibration

•environmental data monitoring (T,I,V)

•data taking

Electronics detector performance:tracks, hits, events

Required tools:Drivers to electronics

Test scriptsUser GUIs

Data analysisVisualization tools

Online and Electronics Ground Support Equipment (EGSE)

Subsystems (TKR, CAL, ACD) – LAT Integration and Test

Mission operation – flight software

Our definition of online: DAQ and monitoring on the ground prior to launchNo interference with flight software developement …. but ….


Online software – how is it made

Online software:Python scripts

Qt GUIsHippoDraw

Flight softwareCompiled C code

hardware

Low-level driversCompiled C code

Low-level driversCompiled C code


GLAST Instrument: the Large Area Telescope (LAT)

DAQ Electronics

Grid

Tracker

Calorimeter

ACD

Thermal Blanket

•Array of 16 identical “Tower” Modules, each with a tracker (Si strips) and a calorimeter (CsI with PIN diode readout) and DAQ module.

•Surrounded by finely segmented ACD (plastic scintillator with PMT readout).

•Aluminum strong-back “Grid,” with heat pipes for transport of heat to the instrument sides

•high modularity


GLAST Tracker Design Overview

• 16 “tower” modules, each with 37cm 37cm of active cross section

• 83m2 of Si in all, like ATLAS • 11500 SSD, ~ 1M channels• 18 x,y planes per tower

– 19 “tray” structures•12 with 3% r.l. W on top (“Front”)•4 with 18% r.l. W on bottom (“Back”) - SuperGlast

•3 with no converter foils (3-in-a-row L1T)– Every other tray is rotated by 90°, so each W foil

is followed immediately by an x,y plane of detectors

•2mm gap between x and y oriented detectors• Trays stack and align at their corners• The bottom tray has a flange to mount on the grid.• Electronics on sides of trays:

– Minimize gap between towers– 9 readout modules on each of 4 sides

• high modularity

Electronics flex cables

Carbon thermal

panel

One Tracker Tower Module


Tracker tower read-out architecture

• 24 64-channels CMOS VLSI (custom ASIC ) read-out chips handle a single detector layer• data can shift left/right with a read-out controller (custom ASIC CMOS) at each end at 20 MHz clock frequency• Fast-OR signals also move l/r or in both directions• A single dead chip can be bypassed without losing data from any other chips• Complete 0-suppression and formatting takes place in the controller chips, i.e. fully digital output• The read-out controller pass data down a tower in a token-controlled protocol

simplified block diagram of the GLAST TKR readout


Tracker front-end electronics

miniMCM7 GTFE2 GTRC

tray with full-size MCM24 encapsulated FE2 encapsulated RC1 ladder bias circuit


LAT electronics hierarchy

Survival jargonAEM : ACD Electronics ModuleTEM : Tower Electronics ModuleGEM : Global trigger Electronics ModuleGASU : Global trigger ACD Signal distribution UnitCC : Cable ControllerRC : Read-out ControllerFE : Front-EndGLT : GLobal Trigger


The LATregisters


Online software hierarchy


Online software hierarchy

An xml schema file is loaded to pass the hardware configuration and load the tree of pointers:

lat = readSchema(‘SimpleTemSchema.xml')

Navigation of the hierarchy is done using methods like down/up/node, e.g. TKR-FE5/layer3/CC2 :

myGTFE = lat.downTEM(0).downTCC(2).downTRC(3).downTFE(5)


e.g. access MODE register on FE5/layer3/CC2 : myGTFE.MODE = 0x0 lat.downTEM(0).downTCC(2).downTRC(3).downTFE(5).MODE mymode = lat.TEM[0].TCC[2].TRC[3].TFE[5].MODEas for standard DAQ software

each register has: mnemonics, serial nb, size

Set() [Get()] looks for mnemonics and set [reads] the register value

Online software – accessing registers

dataless commands are treated as registers of zero size


Online software – constraints, conversions


I&T test stand runtime environment

Finite State Machine framework user GUI handles hardware configuration run test scripts handles communication with logger, database, data monitor


References / entry pointCore software development at SLAC:http://www-glast.slac.stanford.edu/LAT/INT/ONLINE/Default.htm

Essential documents

TEM + ~anything downstream (GTCC, GTRC, GTFE)LAT-TD-00605-D1 TEM Primer Trigger

•GLAST LAT Test Stand Communications Interface (online web page – look at MiniGLT section)•LAT-TD-00606-D1 LAT Inter-module Communications

Specific nodes and test plans for TKR:

node location docGTCC TEM LAT-TD-00605-D1 TEM PrimerGTRC TMCM LAT-TD-248GTFE TMCM LAT-TD-247 MCM* LAT-TD-249 TOWER LAT-TD-191-02 LAT-SS152(level IV specs)

LAT-SS17(level III specs)

TKR specific tools – soon available at http://glastserver.pi.infn.it/glast


Instrument integration and calibration plan

milestone instrument schedule source activity

Engineering Model (EM)

4-trays TKR

1 full-tower CAL

no ACD

3-4/03 CR

VG 17MeV Calibrations

Calibration Unit (CU)

4 full towers 5-6/04 e+

h

Calibrations + science perf. verification

Flight Unit (FU) LAT (16 towers) 10/04 CR, VG Calibrations + science perf. verification

Flight Unit (FU) LAT (16 towers) 05 spacecraft integration

Flight Unit (FU) LAT (16 towers) 05 CR airplane test

October 2006 - LAUNCH

Subsystems acceptance, qualification, environmental tests


The Engineering Model milestone

1 TKR module with 4 live trays (3 XY planes)1 full scale tower CALTower electronicsCalibrate the systemCharge injectionCosmic rays17.6 MeV photons

(from I&T/SVAC)

Timescale - february/june 2003

TKR commissioning :• si sensors test• ladder assembly and test• tray production• FE/RC/MCM production• development of tools for system tests


EGSE - Tower test setup

will be used for EM and full tower tests on ground during I&T

TEST JIG


The Engineering Model milestone – DAQ architecture


TEM

PSA

CMDCOM

EVTCOM

XBRDVMEProc

LV

+28V

GASUcable

TEM biasSensors+Read-out ELX bias (both TKR and CAL)

• VxWorks• low level drivers

DAQ/OnlineWorkstation

• high level python interface (PyLAT)• data analysis and monitoring

I&T test stand - DAQ hardware overview

to CAL

TRAY

TRAY

Read-out event rate 1KHz


I&T test stand - a picture


Test stand – some more survival jargon

EM : Engineering ModelEGSE : Electronics Ground Support Equipment TEM : Tower Electronics ModulePSA : Power Supply AssemblyGASU : Global trigger ACD Signal distribution UnitXBRD : transition board, currently supplying the GASU-trigger and PDU (Power Distribution Unit) functionalitiesLCB : LAT Communication Board – currently implemented as the COM card, will be a custom cPCI board to pulg into the VME processorINTERFACE BOARD : temporary board to connect the TEM to the MCM (same as the one used in the UCSC system, where it connects the MCM directly to the COM card with NO TEM)ITAR : International Traffic in Arms Regulations


I&T / flight DAQ architecture

Allowed independent EGSE/flight software developmentUse of spacecraft communication protocols


Online tools – Qt GUIs

Set of C++ classesConverted to Python with SIP/SWIGCommercial version for developmentFree version for learning


Online analysis-visualization tools : HippoDraw

GUI-driven analysis tool by P. KunzSet of C++ classesJava and Qt GUIsNow providing python scripting capabilities


Source profile

0

0.5

1

1.5

2

2.5

3

3.5

4

63 127 191

Strip number

Co

un

tin

g r

ate

(H

z)

Source + Noise (1 Khz)

Source (100 Hz)

The source profile does NOT change when random noise triggers, obtained by lowering the threshold on boundary channels, are added – the ladder and the read-out are fully efficient

The TKR subsystem point of view – DAQ ladder tests


Threshold Scan with 92Sr source

0.01

0.1

1

10

100

1000

10000

100000

1000000

0 10 20 30 40 50 60 70

Threshold DAC (Threshold range = 1, Bias voltage = 60 V)

Co

un

tin

g R

ate

(Hz)

64 chans FE1, SOURCE

64 chans FE1, NO SOURCE

With source

Without source

The TKR subsystem point of view – DAQ ladder tests

• 50% rate point corresponds to median of the charge-release distribution• assuming a plateau @ 400 Hz (which isn’t evident from the plot, but consistent with a rough measurement performed with a Geiger) this turns out to be about 6fC ~ 40ke- ~> 1MIP• deviations from effects like high charge release from slow electrons, charge sharing, inclined tracks


Before delivery to I&T : suite of scripts for trays/mini-tower testing:

hardware configurations dead channels (charge injection, source scan) noise evaluation (threshold scans, counting rates / occupancy) library of TKR specific functions and test routines

During I&T effort at SLAC same scripts inside standard run-time acquisition low level elx functional tests test grid:

high level functional tests (load/read back – configure system) calibrations (dead chans – noise – ToT) run (17.6 MeV reconstruction) low level tests in response to specific problems

connection to SAS software

Two people been at SLAC (Latronico, Baldini), one currently at SLAC (Cohen-Tanugi), two students from Pisa

Work plans for EM


Tutorial

Running an application from the RunControl

Python PythonWin IDE module browsing using the Python documenter: browse

gLAT.py and tkr_lib.py

Write a Qt GUI in python

HippoDraw for data analysis using a python script and the data inspector

Afternoon tutorial

Glast italian software meeting, Udine 01/30/2003 Luca Latronico The GLAST online software Gamma-ray Large Area Space Telescope Luca Latronico Glast Italia.

Documents

glast italian software

luca latronico online

software tools python

flight software developement

glast lat hardware

tracker tower module

c code slide

v data