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A proposal for Straw detector FE monitoring system. 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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Presentation Transcript
slide2

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
slide3

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)
dcs e lectronics
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
    • Very cheap (<20 CHF per FE board)
    • 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
system topology
System topology

DCS PC

Ethernet switch

Ethernet switch

Ethernet switch

Ethernet switch

Ethernet switch

LV PS

LV PS

Plane (View)

electronics

Chamber 1

Chamber 4

plane view electronics
Plane (view) electronics

10 Mbit Ethernet, WEB server

CP2200

LV distribution board

I2C or SPI

+3.3V

+5V

C8051F340

FE board

C8051F501

+5V

t° DS18B2

30 analog

inputs

I2C or SPI

I2C or SPI

Digital I/O

10 FE boards

component costs
Component costs
  • Thermo-sensor with digital interface~ 2CHF

DS18B20  High-Precision 1-Wire Digital Thermometer

  • Interface MPU C8051F340 <10 CHF
  • ADC MPU C8051F501 <6 CHF
  • OP amp + resistors <4 CHF
  • PCB ~6 CHF/dm2
  • Cat5 cable ~1 CHF/m
  • RJ45 connector ~1 CHF
  • Ethernet switch DGS-1008D, 8 port 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

view units costs
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
chamber units costs
Chamber units costs
  • View electronics 350 CHF * 4 1400 CHF
  • 8-port Ethernet switch 76 CHF
  • Ethernet patch-cord to LV power supply 12 CHF
  • Cat 5 cable chamber->counting room ~100 CHF

In total ~1600 CHF

Total cost

  • 4 chambers 4*1600 6400 CHF
  • Main 8-port Ethernet switch 76 CHF
  • Extra PC Ethernet adapter (if needed) DGE-528T 27CHF
  • Spares (10%)
    • Two Ethernet interface board 30*2 60 CHF
    • Five 3 LV distribution mezzanine boards (LVMB) 5*100= 500 CHF
    • One Ethernet switch 76 CHF

In total <8000 CHF

labor startup cost
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$

maintenance
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
conclusion
Conclusion
  • Modern and quite cheap
  • Could be adapted to needs of any NA62 sub-detector