Report of Run Coordinator by armedman1

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									                     Report of Run Coordinator


                     Run 2006 Summary




Malte Hildebrandt
 Malte Hildebrandt                             Meeting, 14th 14th February 2007
                                     MEG ReviewMEG Review Meeting,February 2007
                    Pre-Commissioning Run 2006
beam and detector operation: 16th – 22nd December 2006
                                    (continuously around-the-clock)

goals:               • run pressure control system to flush COBRA and dc
                     • find beam settings for very low, low and high beam rate
                     • start operation and data taking with dc and tc
                     • perform neutron background measurement
                     • take data with NaJ and plastic scintillator

realisation:         • daily run meeting   • summarise past 24h
                                           • collect requests, wishes, requirements
                                           • organise upcoming 24h


      daily run plan for an
      efficient usage and sharing
      of the rare beam time:

Malte Hildebrandt                                          MEG Review Meeting, 14th February 2007
                                Beam Line
First measurement of muon beam rate in center of COBRA with
complete set of beam line elements, in particular with:
                                                  • degrader
                                                  • correction coils on BTS




         degrader       correction coils for BTS   beam transport solenoid (BTS)

Malte Hildebrandt                                      MEG Review Meeting, 14th February 2007
             COBRA, End-Caps and Insertion System
COBRA               • field stability ~0.05% (FWHM)
                    • 2 quenches: reasons not completely understood
                                      nevertheless: quick recovery (<3h) due to newly
                                                    installed turbo molecular pump

End-Caps              • both end-caps installed
                      • insertion system installed and operated successfully




                    upstream end-cap               downstream end-cap with insertion system

Malte Hildebrandt                                                  MEG Review Meeting, 14th February 2007
                         Gas Distribution and Supply

He volume inside COBRA
   • improved He distribution system inside
     both end-caps and along dc cable duct
     → He fraction >95% after a few hours


Drift Chamber
  • PSI safety requirements fullfilled
    to operate with 10l bottle C2H6                downstream end-cap




      stainless steel tubing       oxygen sensor              ethane sensor

Malte Hildebrandt                                  MEG Review Meeting, 14th February 2007
                                 Target
Target
 • phase 1: during beam commissioning
   „APD“-target („MEG“-target parked)


 • phase 2: „MEG“-target in measuring
            position




                         „APD“-target          „MEG“-target
                                             measuring position
                                          inin parking position

Malte Hildebrandt                             MEG Review Meeting, 14th February 2007
                                  Drift Chamber
                                          „MEG“
                                                    flange to BTS    dc support        gas manifold us
                                           target
• installation:
          8 dc modules (8 out of 16)
          gas manifolds (us and ds)
          pressure gauges
          gas tubing

• 7 (out of 2*8) planes operational
         problems: leaks, HV, LV?, ...

• tasks: HV conditioning without beam                         dc11                dc04
                                                                dc10            dc05
         HV conditioning with beam                                 dc09      dc06
                                                                      dc08 dc07
         Ianode = Ianode (beam rate)
              data taking:
                   Ranode = Ranode (r-coordinate)
                   waveform analysis, tracking        differential                    gas manifold ds
                   ...                              pressure gauge                    and gas tubing

Malte Hildebrandt                                                    MEG Review Meeting, 14th February 2007
                    Pressure Control System
Pressure control system worked stable and reliable!
PDC – PCOBRA
    [Pa]
                                    inlet gas manifold




                                      drift chamber
-1.0


-1.2                                oulet gas manifold




                                                      time [h]
           10:00    11:00
Malte Hildebrandt                                            MEG Review Meeting, 14th February 2007
                           Timing Counter
                                                                      copper collar to seal
                                   us end-cap flange to BTS
• installation:                                                        N2 bag vs end-cap

      nitrogen bags (us and ds)
      N2 distribution system
      all tc bars: 15 tc bars us
                   15 tc bars ds
      no tc fibres

• tasks: gain calibration                                                           N2 bag
         cosmics with/without B
         rate tcus vs tcds
         data taking:
            waveform analysis
            charge ratio studies
            event distribution      PMT of tc bars                   N2 flushing tubes

            ...
Malte Hildebrandt                                             MEG Review Meeting, 14th February 2007
                    Supplementary Components

NaJ and plastic scintillator
   • tasks: studies of radiative muon decay
            background studies for later LXe




Bonner Sphere System and 3He detector
   • tasks: neutron background measurement
            with final beam line elements and
            final beam settings
   → previous measurements confirmed
   → no concerns about neutron background
     in LXe calorimeter


Malte Hildebrandt                               MEG Review Meeting, 14th February 2007
           Trigger, DAQ, Logging and Central MIDAS

Trigger 36 Type1 boards
         5 Type 2 boards                      installed
         4 Ancillary boards                     and
        all cabling                          operational
        Firmware version 0               (except for dc_trigger)



DAQ            DRS chips + cables for:
                 DC: 864 channels
                 TC: 60 channels          data taking with
                 NaJ: 9 channels           all channels
                                            of installed
                                           sub-detector
Logging and Central MIDAS
                                           components


Malte Hildebrandt                                                  MEG Review Meeting, 14th February 2007
                        Beam Tuning and Data Taking

beam tuning              settings for very low beam rate 3%
                                      low beam rate     25%              of ≥ 6·107 m+/s
                                      high beam rate 100%               • at center of COBRA
                                                                        • Iproton = 1.8 mA
                                                                        • 6 cm target E

data taking              • all channels of installed sub-detector components
                           recorded
                         • 285 runs taken at different beam rates and HV settings
                           → in total ~600GB recorded


                    MEG Review Meeting February 2007:
                         • not only technical talks
                         • but also talks about analysis of „real“ data


Malte Hildebrandt                                               MEG Review Meeting, 14th February 2007

								
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