R. Zimmermann - Frascati, October 2002 p.1/18. Raoul Zimmermann. University of Hamburg. Status Precision Tracker

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1 Status Precision Tracker Raoul Zimmermann University of Hamburg R. Zimmermann - Frascati, October 2002 p.1/18

2 Survey money situation readout electronics results from small prototype design and real size prototype summary R. Zimmermann - Frascati, October 2002 p.2/18

3 Money situation investment money still frozen nearly all requirements of the founding agency fulfilled last open point MOU to unfreeze the money founding agency needs an almost finished version R. Zimmermann - Frascati, October 2002 p.3/18

4 Readout electronics preamplifier channels 3375 L3 preamplifier available working advantage: we have these chips, already used in L3 chips under test R. Zimmermann - Frascati, October 2002 p.4/18

5 noise level on 1 m tube: 16 mv (shielding needed) 50 mv on discriminator (L3 used should be 40 mv) R. Zimmermann - Frascati, October 2002 p.5/18

6 next steps: multilayer HV board using discriminator MAX963/961 with real cable length test on single 8 m tube, small and real size prototype test of whole chain (preamp + discr. + Hera B TDC) R. Zimmermann - Frascati, October 2002 p.6/18

7 TDC design of TDC chips finished first engineering samples from NEC arrived samples under test at company MSC (test board) next steps: definition of the interfaces requirements of the DAQ development of TDC board on the basis of Hera B design R. Zimmermann - Frascati, October 2002 p.7/18

8 results from small prototype 48 brass tubes, 30 mm inner diameter Ar+CO (80% / 20%), PVC flexible tube ASD8 + Hera B TDC R. Zimmermann - Frascati, October 2002 p.8/18

9 Oxygen oxygen content in prototype (volume = 34 l) Ar/CO2 80/20 Inlet O2, vpm Outlet 48 brass tubes L=1.0m, D=30mm were connected serially Ar/CO2 80/20 48 brass tubes L=1.0m, D=30mm O2, vpm Volume 34 l were connected serially 4.0m PVC tube D=6mm 0.5m PVC tube D=6mm Gas flow, l/h Gas flow, volume/h avoiding PVC tubes O content decreased by 40 % outgasing tests for all used materials in gas room R. Zimmermann - Frascati, October 2002 p.9/18

10 resolution simplified track reco used from ARGUS TDC spectra, HV=2.3kV RT-relation, HV=2.3kV time [ns] time [ns] wire distance [mm] R. Zimmermann - Frascati, October 2002 p.10/18

11 0 Resolution function, HV=2.2kV Resolution function, HV=2.6kV resolution [mm] [ ] distance [ mm ] all residua distribution wire distance [mm] wire distance [mm] distance [ mm ] trigger on higher cluster number O + H high amount of O better resolution (wire region) new pipes test with new electronic R. Zimmermann - Frascati, October 2002 p.11/18 resolution [mm] resolution [ mm ]

12 residuals, HV=2.3kV ID Entries Mean RMS E mean resolution vs. HV mean resolution [µm] residuals [mm] HV [kv] mean resolution < 300 m (operation voltage) goal reached in spite of contaminations R. Zimmermann - Frascati, October 2002 p.12/18

13 Setup: first efficiency studies done efficiency R. Zimmermann - Frascati, October 2002 p.13/18

14 Cosmics Ar/CO2 80/20 Brass tube L=1.0m, D=36mm, Wire d=45micron Amplifier Garantee Efficiency, % Cosmics Ar/CO2 80/20 U=2.5kV Brass tube L=1.0m, D=36mm, Wire d=45micron Efficiency, % Gas flow 4.0 volume/h Gas flow 0.2 volume/h Gas flow 0.0 volume/h Voltage, kv Time,h efficiency 98.5 %, rest loss due to showers (setup) tube tight (no contaminations), efficiency drop after 15 h (at no flux) R. Zimmermann - Frascati, October 2002 p.14/18

15 Design and real size prototype status of real size prototype production of most parts done tubes + raw material for end plates and perforated sheets already delivered at the moment mounting table under design finished next month due to upgrade of the mechanical workshop production hall occupied using mounting space at DESY (mid of Dec./begin of January) R. Zimmermann - Frascati, October 2002 p.15/18

16 R. Zimmermann - Frascati, October 2002 p.16/18 mounting of prototype will start in January clean room of HERA B:

17 design status design (3d) finished (small parts were changed) using optimal staggering: hits/track # of tracks [%] > R. Zimmermann - Frascati, October 2002 p.17/18

18 Summary MOU to unfreeze the money want to use amp L3 + discr. MAX963, first tests fulfills our requirements TDC chip design finished, engineering samples under test tightness oxygen content in small prototype reasonable efficiency (Guarantee-2) measured to 98.5% O content) / H m (but high O spatial resolution down to 200 mounting of real size prototype in January design finished R. Zimmermann - Frascati, October 2002 p.18/18