NA61 PSD. Upgrade status. Institute for Nuclear Research RAS, Moscow

NA61 PSD is now fully quipped with new electronics - tested on temperature regulation and control stability – OK - tested on data acquisition readout - OK 24 June 2014 2

New cooling system, FEE, HV and control system for one module Electronics of one PSD module after upgrade Readout module (old one) New electronics 3

Schematic view of slow control and temperature control readout system for NA61 PSD HVSys, Dubna flat cable HV control box HVSys HVSys HVSys . . . HVSys LAN TEC TEC TEC TEC RS485 network (twisted pair) USB USB to RS485 Converter PSD readout PC USB to RS485 Converter (We will have 2 RS485 networks X 22 channels each) The system has been tested for stability - OK 24 June 2014 4

First tests of DAQ have shown large noise levels.. one event pedestal spectrum MIP is here - the source is: DAQ concentrator boards - the reason: no common ground after change to new HV power scheme - to fix: make common ground between new and old electronic modules. 24 June 2014 5

But.. we have another noise source: TEC-1091 controller. TEC OFF TEC ON effect on pedestal one event one event TEC OFF TEC ON effect on MIP-like signal one event one event 24 June 2014 6

TEC-1091 effect on pedestal and MIP-like signal TEC OFF pedestal MIP-like TEC ON Why do we not see a significant effect? The answer is: just by chance: signal calculation pedestal calculation ~110 “ticks” 100 “ticks” 24 June 2014 7

Possible solution to avoid noise from TEC-1091 controller: cover TEC PCB with shield (we have used a copper foil) TEC OFF pedestal spectra TEC ON one event one event TEC ON + shield on TEC TEC OFF TEC ON TEC ON + Shield one event 24 June 2014 8

Another possible solution to avoid noise from TEC-1091 controller: use sine fit to calculate pedestal level: - disadvantage: too slow (only for offline analysis) pedestal spectra MIP-like spectra 0-19 ch pedestal sine fit pedestal 0-19 ch pedestal sine fit pedestal 24 June 2014 9

Cooling system test results (48 hours) Room temperature Temperature in one module at different times New MAPDs cooling system based on the Peltier elements provide stable given temperature in each module Temperature of all 44 modules at given time 10

1) the new electronics has been mounted and tested: Conclusions: 1) the new electronics has been mounted and tested: - noise from concentrator boards have been eliminated with common ground - TEC-1091 controller noise has been studied: a) period of noise signal = range of pedestal ↔ signal => minimum noise effect b) offline sine fit for pedestal => minimum noise effect MIP-like signal is visible in (a) and (b) as well 2) slow control and temperature control systems have been tested and show no problems 24 June 2014 11