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Timing RPCs in FOPI

Timing RPCs in FOPI. A.Schüttauf GSI. Outline. FOPI Upgrade Reminder FOPI RPC Designs New Electronics Timing and Efficiency Summary & Outlook. TOF-Barrel Layout. FOPI-Reminder. Central Au-Au collision at 1.45 AGeV has ~60- particles in the acceptance of the proposed RPC barrel

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Timing RPCs in FOPI

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  1. Timing RPCs in FOPI A.Schüttauf GSI 11-13.02.2004 GSI Darmstadt

  2. Outline • FOPI Upgrade Reminder • FOPI RPC Designs • New Electronics • Timing and Efficiency • Summary & Outlook 11-13.02.2004 GSI Darmstadt

  3. TOF-Barrel Layout FOPI-Reminder Central Au-Au collision at 1.45 AGeV has ~60- particles in the acceptance of the proposed RPC barrel This needs a granularity of 700 cells (2500 strips) FOPI TOF: Size ~5 m2 Channels ~5000 t<100 ps <0.5 cm 11-13.02.2004 GSI Darmstadt

  4. Anode 3 mm pitch Capacitor Block 1.1 mm glass 0.3 mm gap RPC side view RPC top view Cathode FOPI-Segmented-Anode-RPCs 11-13.02.2004 GSI Darmstadt

  5. RPC-Super-Module 1 Super module (SM) 5 RPCs 16 strips/RPC 11-13.02.2004 GSI Darmstadt

  6. TAC ASIC # 1 ch. t <10 ps GSI M.Ciobanu GSI-ELEX R.Schulze.R.Hardel K.Koch,E.Badura FEE  Preamp+Disc. Size: 9.5  11 cm2 #Ch: 16 ch Input: Analog 50  Charge sensitive Gain ~ 200 T/Q ~ 2 Power: 0.46 W/ch Output: p-ecl TAQUILA Size: 9.5  25 cm2 #T ch.: 16 TACs #A ch.: 16 ADCs On board Z.S.. Daisy chain 30 TQ 1 GTB-SAM3 New Electronics 11-13.02.2004 GSI Darmstadt

  7. Stable over clocking cycle TAC ~ 12 ps FEE ~ 18 ps Variations ~20 ps TAC < 2 ps FEE < 3 ps Clock  15 ps Intrinsic Electronic Resolution Pulser run 11-13.02.2004 GSI Darmstadt

  8. DaL 11a 90 cm 4 gaps 14 strips DaS 6a 20 cm 6 gaps 12 strips Setup 1 Beam: Protons at 1.0 and 2.0 AGeV Rate: 20-100 Hz/cm2 Gas:C2F4H2/isobutane/SF6 85/5/10 11-13.02.2004 GSI Darmstadt

  9. 1 Hz/cm2. 90 cm counter 20 cm counter Darkrate • Takes 3 day under high voltage. • Does not scale with border length • but with the area. • Low value < 1 Hz/cm2. 11-13.02.2004 GSI Darmstadt

  10. ~3 % Reflections Counter reflections are below 3 % Reflection at the Lemo MEC1 adapter will disappear with new interface. 11-13.02.2004 GSI Darmstadt

  11. t < 80 ps Tail < 2% RPC 1 with 4 gaps and 14 strips 11-13.02.2004 GSI Darmstadt

  12. t < 75 ps Tail < 3% RPC 2 with 6 gaps and 12 strips 11-13.02.2004 GSI Darmstadt

  13. Super Module RPC2 11a CDC RPC1 13a RPC Mini Scint+Pmp Setup 2 U+Au 900 AMeV 2 RPC + Mini 13a : 90cm 6 gaps 14 strips 11a: 90cm 4gaps 12 strips Mini: 45 cm2 4gaps RPC 11-13.02.2004 GSI Darmstadt

  14. 90 cm 2mm strip 1mm gap Cluster Parameters: Cl. Width & Charge 4 gap RPC 6.4 kV 1.4 93 % 98% 2.0 6 gap RPC 9.5 kV 11-13.02.2004 GSI Darmstadt

  15. 90 cm 2mm strip 1mm gap Clean Mixed One timing arrive second  102 Both timings arrive first  101 Both timings arrive second 202 One timing arrive second  201 Hit Hit Classification vs~15 cm/ns 0.5 mV <Up<30 mV 2 1 1 2 2 1 11-13.02.2004 GSI Darmstadt

  16. Matched Hit Performance : Primary Signal t< 75 ps  > 95 % Using fast pions for determining the time resolution. t < 75 ps Tail < 3 % 11-13.02.2004 GSI Darmstadt

  17. Matched Hit Performance: Multihit One signal of first hit mixed Clean second hit t< 105 ps  > 85 % t< 95-100 ps  > 94 % 11-13.02.2004 GSI Darmstadt

  18. Momentum vs Velocity for RPC U+Au 900 AMeV P-V Plot Momentum vs Velocity for FOPI barrel t<250 ps t<100 ps 11-13.02.2004 GSI Darmstadt

  19. Conclusion & Outlook • FOPI Conclusions • We successfully tested our electronics • t<12ps for the TAC • t<30ps for the system • The RPC-design changes improved our • reflection probability from 50% to 5 %. • The darkrate within the counters is below • 1 Hz/cm2. • The in beam tests showed a single hit • resolution of t < 75 ps at an  > 95 %. • The double hit performance showed a • deterioration of the time resolution by 25- • 30 ps at maximum. • Nevertheless such a counter can do • the job in FOPI. • FOPI Outlook • Needs one more iteration of FEE and • TAQUILA to make it user friendly. • Change individual lemo cables to common • cables. • Maybe built a 8 gap RPC : Thresh./Mean. • Build a full super-module with 5 RPCs and • run for statistics. • BUILT IT ! • CBM Outlook • Test rate capability of strip anode RPCs. • Start higher integration for analog an digital • electronics. • Test new anode designs. 11-13.02.2004 GSI Darmstadt

  20. People IPNE, Bucharest M.Petrovici V.Simion HD-University E.Cordier N.Herrmann A.Mangiarotti GSI-KPI : M.Ciobanu K.Hildenbrand M.Marquardt A.Schüttauf A.Weinert GSI-DVEE E.Badura R.Hardel K.Koch R.Schulze 11-13.02.2004 GSI Darmstadt

  21. Efficiency for Protons Mini-Position Full -counter HTYP =101 HTYP >101 11-13.02.2004 GSI Darmstadt

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