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The cosmic trigger for the Large Prototype

The cosmic trigger for the Large Prototype. Th. Chaminade, P. Colas, K. Dehmelt, M. Karolak, G. De Lentdecker, S. Hervé, X. Janssen, Y. Kato, H. Kuroiwa, Y. Kudenko, T. Matsuda, F. Pierre, J.M. Reymond, S. Turnbull. The Large Prototype. 5 slabs on top. Cosmics in March 08 Beam summer 08

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The cosmic trigger for the Large Prototype

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  1. The cosmic trigger for the Large Prototype Th. Chaminade, P. Colas, K. Dehmelt, M. Karolak, G. De Lentdecker, S. Hervé, X. Janssen, Y. Kato, H. Kuroiwa, Y. Kudenko, T. Matsuda, F. Pierre, J.M. Reymond, S. Turnbull P. Colas - LP cosmic trigger

  2. The Large Prototype 5 slabs on top Cosmics in March 08 Beam summer 08 7 panels before end 09 Present layout: 12 slabs (+ 3 spare) 3 slabs at bottom +4 perpendicular to limit the triggers to the detector length P. Colas - LP cosmic trigger

  3. Many possible combinations, for instance: 1 top + 1 bottom : central region of central panel 3 top + 1 bottom : radial tracks on central panels 3 top + 3 bottom : vertical tracks on most of the central region Requires a ‘bridge’ to support the magnet and its movement system. P. Colas - LP cosmic trigger

  4. Organization is building-up • T. Matsuda (KEK) : Coordinator • + Y. Kato, H. Kuroiwa : initial tests • INR Moscow, Y. Kudenko : slab manufacturing • DESY, K. Dehmelt : on-site installation, crates, trigger logic • Saclay : readout, wrapping, mechanics • PC (scientific coordinator), Th. Chaminade (technical coordinator) • J.-M. Reymond (head of the integration lab) : cooling system • M. Karolak, M. Riallot, S. Hervé : mechanical design, wrapping • S. Turnbull, PC, F. Pierre : tests • F. Sénée (Micromegas panel technical coordinator) • Brussels (G. De Lentdecker, X. Janssen) TLU, logging, interfacing P. Colas - LP cosmic trigger

  5. The trigger has to be in a field of order 0.4 T. MPPC : multi-pixel photo counters (so-called Silicon PM) produced by Hamamatsu 100 pixels on 1 mm2. Each is a Photodiode in Geiger mode Operation voltage : Vbreakdown + fraction of a Volt Requires accurate supplies about 70 V. Need to sort the MPPCs in Vbreakdown to reduce the number of supplies. Signal: 3 mV/p.e. (20 p.e. per fiber end, measured by Yuri Kudenko) Dark counting rate and Vbkd sensitive to temperature : needs good temperature control: Peltier devices + thermistances+controler 1mm P. Colas - LP cosmic trigger

  6. SLABS (INR Moscow) New design (wrt T2K SMRD) : U-shape groove Extrusion and machining done (width 167mm) light output measured : 19-20 each end Shipping to Saclay scheduled for next week P. Colas - LP cosmic trigger

  7. Wavelength shifting fiber Box with photocouplers, MPPC, R,C circuit, Thermistance, Peltier device Scintillator slab Controller Trigger logic TLU Supply Temperature control: Jean-Marc Reymond P. Colas - LP cosmic trigger

  8. Mechanics can be simple: wrapped slabs maintained by U-shape bars Al-mylar reflector being ordered P. Colas - LP cosmic trigger

  9. First step : hands on MPPC • Testbox assembled • Amplifiers (phillips?) to be decided • 100 V Supply selected : Voltcraft precision PS PPS 12008 (400 € each), ready to order 4. • Thanks to many advices (J-Ch Vannel, Erika Garutti, Japanese) P. Colas - LP cosmic trigger

  10. Readout and thermal regulation box design • 3 parts top, bottom parallel, bottom perpendicular. • In each box: thermistance, peltier device • In a central place : controler • Design mechanics, system, cables • Light-tightness vs accessibility • Visit to DESY with Klaus Dehmelt before mid-February P. Colas - LP cosmic trigger

  11. Conclusion and plans • Need a robust system: temperature control • Slabs delivered next week (tbc) • Wrapping in Saclay 2 weeks after • Installation in March • Connexion to DAQ in March P. Colas - LP cosmic trigger

  12. The gain depends on Vbias, and Vbreakdown depends on the temperature Requires both a stable and precise supply and a controlled temperature. P. Colas - LP cosmic trigger

  13. P. Colas - LP cosmic trigger

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