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STATUS OF THE DATA TAKING

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Started to dismount the cage and add the first ring Sunday, exchanged GEM - Micromegas ... without notice, sealed with kapton tape and glue in the crack, flush again ... – PowerPoint PPT presentation

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Title: STATUS OF THE DATA TAKING


1
STATUS OF THE DATA TAKING
JANUARY 2006 COSMIC RUN
2
Commissioning
  • Nitoh san prepared CF4 and Argon lines, Watanabe
    san prepared DAQ, Kuroiwa san prepared trigger
    counters
  • Ron, Dan, Arnaud and Paul arrived Sat. 14
  • Started to dismount the cage and add the first
    ring Sunday, exchanged GEM lt-gt Micromegas
  • Started to flush gas (TDR gas) on Sunday huge
    leak (10l/h, no bubbling)
  • Suspected leak around PCB, add glue
  • Monday 16 still huge leak, add more glue
  • Tuesday 17 realised that the O-ring had been
    removed without notice, sealed with kapton tape
    and glue in the crack, flush again
  • Wednesday 18 detector and trigger commissioning,
    readout and HV connections, hunt for noise -gt
    start data taking (Watanabe, Fujii)
  • Micromegas worked immediately and smoothly,
    gain2800, with TDR gas.

3
  • Detector as in October 384 channels, resistive
    foil
  • Start with B0

4
TDR gas works
Ar5 Isobutane
Ar10 CO2
TDR gas Ar2CH45 CO2
TDR gas Ar2CH45 CO2
As well known TDR gas not optimal for energy
resolution. In addition noise conditions less
good than in the beam area
5
However good events
6
DATA (so far)
  • 1000 evts with Edrift207 V/cm
  • More than 8000 evts with Edrift136 V/cm
  • Total about 10,000 TDR gas events with B0

7
The ILC Micromegas TPC ready to take data (July
2015)
ALICE TPC AT CERN (Dec 2005)
8
Next
  • Add isobutane (Nitoh san sets a separate line for
    more accuracy and flexibility)
  • Enter the magnet
  • Take 2-3 days of Ar jCF4 (3) iso (2)
  • Get the ECF4 out of Narita Matsuda san
  • Take 2-3 days of Ar eCF4 (3) iso (2)
  • Study jCF4 in Paris (needs a japanese reducer or
    adapter Matsuda san)
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