S.Sergeev, JINR, Dubna

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 NB 2

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) Straw tracker requirements 3

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 4

System topology … DCS PCEthernet switch Chamber 1Chamber 4 Plane (View) electronics LV PS 5

Plane (view) electronics 6 I2C or SPI 10 Mbit Ethernet, WEB server CP2200 C8051F340 +5V +3.3V I2C or SPI FE board C8051F analog inputs Digital I/O I2C or SPI LV distribution board 10 FE boards t° DS18B2 t°

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/dm 2 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-RJ Networking cable, 5m 12 CHF COGESTRA-LASER SA. 2, Route du Mandement 144, 1242 Satigny 7

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 8

Chamber units costs View electronics 350 CHF * 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* CHF Main 8-port Ethernet switch 76 CHF Extra PC Ethernet adapter (if needed) DGE-528T 27CHF Spares (10%) Two Ethernet interface board 30*260 CHF Five 3 LV distribution mezzanine boards (LVMB) 5*100=500 CHF One Ethernet switch 76 CHF In total <8000 CHF 9

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 11

Conclusion Modern and quite cheap Could be adapted to needs of any NA62 sub-detector 12