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M. Bonesini INFN Milano

MICE TOFes construction & planning. M. Bonesini INFN Milano. Outline. Present design of TOF0 (TP endorsed) BTF testbeam plans TOF1 design TOF2 design. Rates (Singles per ms) target insertion reduced to get 600 good mu+/sec (AUG05). 6 pi beam from T. Roberts.

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M. Bonesini INFN Milano

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  1. MICE TOFes construction & planning M. Bonesini INFN Milano M. Bonesini - 08/06/06 Fermilab

  2. Outline • Present design of TOF0 (TP endorsed) • BTF testbeam plans • TOF1 design • TOF2 design M. Bonesini - 08/06/06 Fermilab

  3. Rates (Singles per ms) target insertion reduced to get 600 good mu+/sec (AUG05) 6 pi beam from T. Roberts M. Bonesini - 08/06/06 Fermilab

  4. 1pi beamline design from D. Adams M. Bonesini - 08/06/06 Fermilab

  5. Present design of TOF0 • From D. Adams & T. Roberts simulations a 40 x 40 cm2 active area and a 4 cm segmentation seems a good choice • BC-420 scintillator bars 40 x 4 x 2.5 cm3 ordered at Bicron (emission peak ~390 nm) • simple fish-tail lighguides UVT plexi M. Bonesini - 08/06/06 Fermilab

  6. A detailed description of TOF0 and related tests (PMT, cosmics …) is in preparation and will be delivered soon as MICE note M. Bonesini - 08/06/06 Fermilab

  7. TOF0 prototype • mechanics: • Some barrettes (BC420 40 x 4 x2.5 cm3) ready with fish-tail lightguides + PMTs (R4998) • Additional barrettes with different scintillators (BC408/BC404/BC420/EJ230) and size (6cm witdth) ready • electronics + DAQ : • QADC + TDC (V792 + V1290) in hands; no Nino-chip • DAQ (ftom JS) in hands M. Bonesini - 08/06/06 Fermilab

  8. TOF frond-end electronics 3 choices, in order of difficulty: • CF discriminator + TDC only • Splitter + L.E. discriminator/TDC + QADC • ALICE Nino chip (integrator+ fast discriminator) + TDC M. Bonesini - 08/06/06 Fermilab

  9. Discriminator choice Choice between: • CF discrimininator : no need of time-walk correction no QDC line/splitter needed, but st is usually worse • L.E. discriminator: st is usually better, but a QDC is needed • 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 - 08/06/06 Fermilab

  10. The BTF testbeam • Testbeam 10-20 July allocated at BTF • We will have our DAQ based on CAEN V2718 (not use default BTF one, Labview based) • We can test TOF resolutions, not rate effects (for this we can do only lab tests with our laser system) M. Bonesini - 08/06/06 Fermilab

  11. What we plan to test in BTF, as regards TOF FEE • MICE baseline-1 solution: V1290 TDC + CF discriminator CAEN V812B (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) M. Bonesini - 08/06/06 Fermilab

  12. 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) • Real delicate point: choice of CF discriminator M. Bonesini - 08/06/06 Fermilab

  13. What is needed for TOF at BTF • TOF0 prototypes equipped with R4998 PMTS – ready • additional counters to be tested ( diff scintillator, lengths, fine mesh PMTs): useful for TOF1/2 – ready • Finger counters to define precisely beam impact point available from MEG tests - requested • HV/signal cables, splitters, NIM discriminators, VME modules – to be checked, but available • CAEN VME CF discriminators – to be requested (EP Pool ?) • DAQ (JS) – ready, cloned in Milano • monitoring (JS) – ready • pre-test with cosmics to debug full size counters: in preparation in Milano M. Bonesini - 08/06/06 Fermilab

  14. TOF testbeam targets: • TOF0 with simple MCA • Test time resolution at various positions with single particles • TOF0 with full DAQ • Test time resolution at various positions with single particles • Test time resolution with particle pile-up • Make comparisons with TDC+CF discriminators and TDC+QADC measurements • TOF1/2 with full DAQ • Test time resolution with cheaper UPS-95F counters • Test time resolution with bigger detectors • Test time resolution with fine-mesh 1”,1.5” PMTs (if possible) M. Bonesini - 08/06/06 Fermilab

  15. Some side considerations for TOF1/TOF2 • up to know only fine-mesh PMT solution considered • But problem: their cost has increased as respect to previous quotations by 50% !!!! (increase of cost of fine-mesh grids, according to Hamamatsu) , R4998 are better (smaller TTS, rate capability, …) and in a short time Hamamatsu may discontinue their production • studies by J. Cobb+ H. Witte to see if we can change B// (not shieldable in conventional PMTs) into B_|_ (shieldable) M. Bonesini - 08/06/06 Fermilab

  16. TOF 2 PMT geometry Most of the following is just paste&cut from John&Holger notes/studies credits&questions to them M. Bonesini - 08/06/06 Fermilab

  17. B field components at TOF2: no iron shield From John&Holger 2-D computations M. Bonesini - 08/06/06 Fermilab

  18. B field at TOF2: one 100 mm iron shield M. Bonesini - 08/06/06 Fermilab

  19. B field is ~ 200 G //; ~ 0.1 T _|_ M. Bonesini - 08/06/06 Fermilab

  20. B field at TOF2 with 2 iron shields sandwiching TOF2 M. Bonesini - 08/06/06 Fermilab

  21. B// ~ 40 Gauss, B_|_ ~ 0.13 T • Problem: individual PMTs must be shielded with soft iron, but this implies a 3-D calculation to be completely sure • Valuable option to be finalized • (conventional PMTs cheaper + better performances) M. Bonesini - 08/06/06 Fermilab

  22. TOF1 baseline • 48 x 48 cm2 active area (still OK?) • if 2nd global shielding adopted: conventional PMTs • request funds for 2007 (+ TOF0 electronics) M. Bonesini - 08/06/06 Fermilab

  23. TOF2 baseline • 60 x 60 cm2 active area (it was 48 x 48 cm 2 active area, as based on previous MC simulations …) • if 2nd global shielding adopted: conventional PMTs • request funding for 2008 M. Bonesini - 08/06/06 Fermilab

  24. Conclusions • up to now we are in schedule • good news: Pavia (G. Cecchet et al.) will join us on TOF • bad news: still pending full INFN approval (this gives problems for thesis, workshops use …) • realistic requests: 2007 TOF0 electronics+ TOF1 ; 2008 TOF2 M. Bonesini - 08/06/06 Fermilab

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