Post on 28-Dec-2015
TCSG November 10th 1999, H.J.Burckhart
1
DCS
Status of the general purpose Status of the general purpose I/O system LMBI/O system LMB
DCS Architecture LLocal MMonitor BBox (LMB)
Concept Measurements and Results Future
TCSG November 10th 1999, H.J.Burckhart
2
DCSSubdetectorsSubdetectors
TCSG November 10th 1999, H.J.Burckhart
3
DCSDetector organizationDetector organization
Hierarchical organisation of quasi independent units (“objects”) Separation for various reasons (organisational, operational,
geometrical, etc.) Units have to operate stand-alone and integrated Data flow mainly vertically
Common Infrastructure handled like a subdetector
TCSG November 10th 1999, H.J.Burckhart
4
DCSDCS ArchitectureDCS Architecture
TCSG November 10th 1999, H.J.Burckhart
5
DCSHierarchical levels of DCSHierarchical levels of DCS
Supervisor Leveloperator console shift operator, sub-system expertserver data base, DAQ, External system
Subsystem control levelLocal Ctrl Station Gas, HV, endcap
SCADASCADA
--------------------------------------------------------------------------------Device Control FE I/OFE I/O
stand-alone system alignment, gas analyserFieldbus node chamber, power supplyPLC cooling, gas mixer
Sensors, actuators
TCSG November 10th 1999, H.J.Burckhart
6
DCSRequirements I/O systemRequirements I/O system
Radiation (1011 neutrons/cm2 over 10 years outside of calorimeter) analogue effects (e.g. loss of gain) Single Event Upset (e.g. program corruption)
Magnetic field (up to 1000 Gauss in UX15 racks) Access restriction I/O points distributed over whole detector volume
( up to 100m distances) Standardized connections to SCADA
HW: Fieldbus, LAN SW: OPC, TCP/IP
TCSG November 10th 1999, H.J.Burckhart
7
DCSFront-end I/O systemFront-end I/O system
Separation in Sub-detector specific and General Purpose I/O system
Reasons for General Purpose I/O system: needed for monitoring common infrastructure radiation tolerance high production volume (price) maintenance interfacing to SCADA common software, only configuring needed
TCSG November 10th 1999, H.J.Burckhart
8
DCSConcept of LMBConcept of LMB
Modular system made out of building blocks (original idea from NIKHEF) CAN node I/O unit (e.g. ADC, bit I/O) signal conditioning (e.g. range, excitation current) add-on features (e.g. interlocks)
Different packaging (e.g. stand-alone, plug-on board, embedded on existing PCB)
Prototyping in ATLAS (in collaboration with sub-detectors), production in industry
Industrial standard (CAN)
TCSG November 10th 1999, H.J.Burckhart
9
DCSLMB Design FeaturesLMB Design Features
Radiation Tolerance selected COTS over-design performance, allow for degradation operate at lower values than specified install at protected and accessible places replace after n years
Operation in magnetic field no coils, chokes, transformers, DC/DC remote power
Limited access remote diagnostics remote loading of programs and reset
TCSG November 10th 1999, H.J.Burckhart
10
DCSImplementation of LMBImplementation of LMB
Prototype series produced (40 + 100 modules) and given to all ATLAS sub-detectors ( + others)
Existing building blocks: CAN controller module front end I/O board
multiplexed ADC 16+7 bit, 16-64 channels digital I/O ( in preparation)
signal adaptation board PT100 (4-wire connection) PTx, NTC (2-wire connection) (LAr, BNL) voltage, current adapters
interlock circuit (Pixel, Wuppertal)
TCSG November 10th 1999, H.J.Burckhart
11
DCSLMB block diagramLMB block diagram
TCSG November 10th 1999, H.J.Burckhart
12
DCSLMB Front-end boardLMB Front-end board
TCSG November 10th 1999, H.J.Burckhart
13
DCSLMB prototypeLMB prototype
TCSG November 10th 1999, H.J.Burckhart
14
DCSRadiation measurementsRadiation measurements
1998 in TCC2, LMB not powered 79 days, 200 Gy, 2*1012 neutrons/cm2
2 EEPROM cells changed substantial gain loss of opto-couplers
1998 at PROSPERO reactor, neutrons < 4 MeV, LMB read out 5 hours, 9*1012 neutrons/cm2
substantial gain loss of opto-couplers
TCSG November 10th 1999, H.J.Burckhart
15
DCSRadiation measurements (cont.)Radiation measurements (cont.)
1999 in TCC2, LMB read out 80 days, 200Gy, 2*1012 neutrons/cm2
different opto-couplers (see plot) some multiplexer failed after 75 Gy increased power consumption and some functional
problems after 125 Gy and 1012 neutrons/cm2
3 cases of program corruption, power on/off cured problem
TCSG November 10th 1999, H.J.Burckhart
16
DCSRadiation tests in TCC2Radiation tests in TCC2
Objectives:•long-term stability of operation in a radiation environment•behavior of components e.g. optos, EEPROM
TCSG November 10th 1999, H.J.Burckhart
17
DCSRadiation test opto-couplersRadiation test opto-couplers
TCSG November 10th 1999, H.J.Burckhart
18
DCSLAr High Precision Temp. Meas.LAr High Precision Temp. Meas.
TCSG November 10th 1999, H.J.Burckhart
19
DCSPrecision Temperature measurementPrecision Temperature measurement
PRT and PT5 10/7 1998
90.04
90.05
90.06
90.07
90.08
90.09
90.10
90.11
14:33 14:43 14:53 15:03 15:13 15:23
Time (h)
Tem
pe
ratu
re (
K) PRT
PT5
PRT- PT5Mean = -3.1 mKStdev = 0.9 mK
TCSG November 10th 1999, H.J.Burckhart
20
DCSPrecision Temperature measurementPrecision Temperature measurement
0
100
200
300
400
500
600
-10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 (mK)
Fre
qu
en
cy
Date: 21 July 1998Time: 15:00 to 24:00hSample period: 30sSensors: PTR and PT5MEAN = 1.0 mKStdev = 1.2 mK
TCSG November 10th 1999, H.J.Burckhart
21
DCSPixel Cooling SystemPixel Cooling System
some 100 temperature sensors some 10 other ADC channels (flow, pressure, etc) Feedback loops (ADC, DAC) use LMB for ADC, industrial CAN modules for
rest
TCSG November 10th 1999, H.J.Burckhart
22
DCSPerformance and features of LMBPerformance and features of LMB
Resolution 16 bit (0.8mK) absolute accuracy 4*10-5 (3mK) long term stability 50ppm over one month radiation tolerance basically ok
weak components eliminated final test to be done
works in magnetic field (9kG) in-field programmable CAN standard low cost (2US$ per ADC_chan)
TCSG November 10th 1999, H.J.Burckhart
23
DCSFuture LMBFuture LMB
Further developments: Digital I/O DAC Bus converters (e.g. JTAG, I2C) Dedicated functions with custom programs in
micro-controller
TCSG November 10th 1999, H.J.Burckhart
24
DCSSummarySummary
LMB concept very suited for distributed DCS Necessary performance achieved Projected price “very reasonable” LMB adopted as baseline by some subdetectors LMB review started (Web: ATLAS->T/DAQ->DCS) Questions to subdetectors:
what application what type of modules number of channels, granularity packaging (stand alone, plug-on, embedded) time scale