M. Bonesini DAQ Meeting1 M. Bonesini INFN Milano Some Considerations for MICE TOF Stations FE electronics (mainly TOF0)

M. Bonesini DAQ Meeting2 Outline  rate considerations mainly for TOF0  readout electronics 1. Cables 2. Discriminators 3. FE schemes: TDC only or TDC+QADC  BTF testbeam plans  Conclusions

M. Bonesini DAQ Meeting3 Rates (Singles per ms) target insertion reduced to get 600 good mu+/sec (AUG05) LAHETGeant4MARSAverage TOF TOF Tracker Tracker TOF Good μ + (Ev/sec)

M. Bonesini DAQ Meeting4 TOF0 AUG05 beamline:news from 21/10/05 from T. Roberts 6pi beam

M. Bonesini DAQ Meeting5 1pi beamline design from D. Adams

M. Bonesini DAQ Meeting6 What does it means for a single TOF channel ? From D. Adams & T. Roberts we can expect a rate ~.5 MHz/ch at TOF0, ~.25 MHz/ch at TOF1, ~.2 MHz at TOF2 PMTs must sustain high rate, eg high average anode current. Fine for TOF0 with R active divider FE + DAQ must cope with rate: ie conversion time ~1-2  s, ~1000 events buffering

M. Bonesini DAQ Meeting7 Cables/Splitters output PMT signal on RG213 cables with BNC connectors (~50 cm RG274 cable from PMT, patch panel, RG213 ~35 m long) 1. RG213 differential variation with temperature 30 ppm/C as measured in HARP (3 times less than conventional RG58 cables) 2. Available cables 40 m long: problem if we need much shorter ones (we have to cut/reconnectorize them) or longer ones (extra cost ~10KE) Depending on discriminator choice (CF vs L.E. or ALICE integrator solution) splitter can be needed active splitter (recuperated from Harp: ~100 ch) maybe a choice splitter L.E. discrim TDC QDC PMT signal

M. Bonesini DAQ Meeting8 Discriminator choice Choice between: 1. CF discrimininator : no need of time-walk correction no QDC line/splitter needed, but  t is usually worse 2. L.E. discriminator:  t is usually better, but a QDC is needed 3. ALICE NINO chip: it includes a discriminator + an integrator to make possible TOT correction (slightly equivalent to p.h. correction). According to ALICE coll. solution 3 is equivalent to 2 Problem: while solutions 1-2 are commercial ones (CAEN or …); solution 3 needs some R&D

M. Bonesini DAQ Meeting9 ALICE NINO Chip (info from JS ) Measure the Charge with Time Over Threshold Principle Advantage: Easy Cabling and Charge Measurement (not linear though) Good Precision for Time Walk Correction NINO = ASIC developed by CERN/MIC for Alice TOF Discriminator with ToT “proportional” to the Charge (at low amplitude): provides 50 ps resolution (IEE TNS Vol 51-5 (2004) ) Drawback : Requires Board development ! Cost: board production + development ~ 20 K PMTNINO TDC Trigger Logic Width ~Charge Rising edge + Trailing edge Time Measurement

M. Bonesini DAQ Meeting10 TDC choice Standard CAEN V775 TDC (HARP like) are not viable due to long conversion time (2.x  s) and small memory buffer (32 evts) We plan to use CAEN V1290 multi-hit TDC: continuos operating mode, leading/trailing edge operations, 1000 evts buffer memory Problems: V1290 is not an easy object to handle. 1 module just delivered in Milano, we plan to use it at BTF and compare performances with V792+V775

M. Bonesini DAQ Meeting11 The BTF testbeam Testbeam 10+2 days requested for beginning of June We will try to have our DAQ based on CAEN V2718 (not use default BTF one, Labview based) We can test TOF resolutions, not rate effects Energy range MeV e - /e + Max rep rate50 Hz Pulse duration 10 ns Current/pulse particles

M. Bonesini DAQ Meeting12 What we plan to test in BTF, as regards TOF FEE reference solution (HARP-like): Harp splitter+V775 TDC + V792 QADC + L.E. discriminator MICE baseline-1 solution: V1290 TDC + CF discriminator (Mb-1) MICE baseline-2 solution: Harp splitter + V1290 TDC + QADC + L.E. discriminator. For the time being QADC will be V792, waiting for new CAEN QADC based on V1724, to be delivered end of this year (Mb-2) If available: V1290 TDC + ALICE NINO chip (discriminator+integrator)

M. Bonesini DAQ Meeting13 Some considerations for TOFFE MICE baseline-1 solution is easy and if works minimize manpower (our more delicate issue) we can try to adopt Mb-1 to proceed later to Mb-2 (still reduce manpower) ALICE NINO solution requires real work: I will suggest to consider it only if Mb-1 or Mb- 2 will not work Real delicate point: choice of CF discriminator

M. Bonesini DAQ Meeting14 What are the discriminators on the market? L.E. discriminators CF discriminator Not many: in my mind some models from CAEN + CF8000 from Ortec

M. Bonesini DAQ Meeting15 Conclusions up to now we are in schedule but manpower is very thin and we have to avoid non-commercial solutions, if possible BTF testbeam will be asses many points