Transcript A proposal for cheap DCS for Straw detector

S.Sergeev, JINR, Dubna
NB
 This is just an example of what could be done
 Could be extended to needs of any NA62 sub-
detector requiring a lot of analog measurements
 Does not replace PVSS-based software which is
needed in any case
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Straw tracker requirements
 Detector contains 16*28=448 FE boards located at
4 chambers having 4 views each.
 For each board the DCS should monitor
 2 voltages (2.5 and 3.3 V) with accuracy ~1%
 1 current (~1A) with accuracy ~1%
 1 temperature with accuracy ~0.5C
 In total 1344 channel of voltage/current
measurement and 448 temperature measurement
channels.
 Desired refresh period ~ 1sec (archiving period
much longer)
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DCS electronics
 We propose to use
 Silabs microcontrollers for voltage/current readout and
 Maxim (Dallas Semiconductor) 1-wire bus based thermo-sensors for
temperature measurement
 Using of Ethernet for communications chamber-DCS PC and SPI or I2C
inside the chamber electronics
 DCS data polling at FE level
 Advantages
20 CHF per FE board)
 Very cheap (<
 Based on industrial equipment
 Could be accessed by any WEB browser
 Drawback
 Development of quite simple DIM-server (all in hands, supported by
CERN) or bit more complicated OPC server (industrial toolkit) for
interfacing to PVSS
4
System topology
Chamber 1
Ethernet switch
Ethernet switch
Ethernet switch
LV PS
LV PS
Ethernet switch
Ethernet switch
Plane (View)
electronics
DCS PC
…
Chamber 4
5
Plane (view) electronics
CP2200
I2C or SPI
10 Mbit Ethernet, WEB server
+3.3V
LV distribution board
t°
C8051F340
+5V
FE board
I2C or SPI
+5V
I2C or SPI
C8051F501
t°
DS18B2
30 analog
inputs
Digital I/O
10 FE boards
t°
6
Component costs
 Thermo-sensor with digital interface
~ 2CHF
DS18B20 High-Precision 1-Wire Digital Thermometer







Interface MPU C8051F340
ADC MPU C8051F501
OP amp + resistors
PCB
Cat5 cable
RJ45 connector
Ethernet switch DGS-1008D, 8 port
<10 CHF
<6 CHF
<4 CHF
~6 CHF/dm2
~1 CHF/m
~1 CHF
76CHF
COGESTRA-LASER SA. 2, Route du Mandement 144, 1242 Satigny
 CBL-RJ45-44005 Networking cable, 5m
12 CHF
COGESTRA-LASER SA. 2, Route du Mandement 144, 1242 Satigny
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View units costs
 Ethernet interface Silabs CP2201-EK (industrial version)
~30CHF or home-made version (only required
components)
~25CHF
 3 LV distribution mezzanine boards (LVMB) 1 sq.dm with
C8051F501, op amps, resistors
~100*3=300 CHF
 Ethernet 5 m patch cable
12 CHF
In total ~350 CHF
 LV distribution mother board – a part of infrastructure (not
a DCS) , the cost is not clear
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Chamber units costs




View electronics 350 CHF * 4
8-port Ethernet switch 76 CHF
Ethernet patch-cord to LV power supply
Cat 5 cable chamber->counting room
Total cost
 4 chambers 4*1600
 Main 8-port Ethernet switch
 Extra PC Ethernet adapter (if needed) DGE-528T
 Spares (10%)
 Two Ethernet interface board 30*2
 Five 3 LV distribution mezzanine boards (LVMB) 5*100=
 One Ethernet switch
1400 CHF
12 CHF
~100 CHF
In total ~1600 CHF
6400 CHF
76 CHF
27CHF
60 CHF
500 CHF
76 CHF
In total <8000 CHF
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Labor + startup cost
 Development of DIM server
~3 FTE man-months (Dubna)
 Development of WEB server + other interface software +
debugging software
~3 FTE man-months (Dubna)
 Development of LV mezzanine board software
~2 FTE man-months (Dubna)
 Assembling and debugging at CERN
~ 2 man-months
 Startup cost including development kits, compiler license etc.
~3000$
10
Maintenance
 As shows the experience, the DIM server does not
need any support. Update of DIM version is done
just by replacement of .dll files in corresponding
directory
 Replacement of Ethernet interface unit requires
modification of IP address in a server – could be
done in a setup GUI or in a configuration file
 Replacement of LV distribution mezzanine board
does not require any adjustment. ADC calibration
should be done during board manufacturing
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Conclusion
Modern and quite cheap
Could be adapted to needs of
any NA62 sub-detector
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