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					805 MHz cavity Mo button
    test data update

         D Huang, IIT
    Al Moretti, Z Qian, FNAL
              Introduction I
                           Locations of PMT detectors
• Geometry                                 Small paddle
                            NaI crystal
  – 7 PMT detectors, 7
                                                   cabinets
    chipmunks around the
    cavities

                                               ladder
• Spectrum
  – Measurements were
    carried out via the
    CAMAC system on
    MTA DAQ rack

                                                          2
            Introduction II
• Measure the radiation data at different rf
  field with variant magnetic field, i.e.: 0,
  0.25T, 0.5T, 0.75T, 1.00T,1.25T, 1.50T,
  1.75T, 2.00T, 2.25T, 2.50T, 2.75T, 3.00T,
  3.25T, 3.5T, 3.75T, 4.00T, 4.25T
• DAQ in 1000 counting pulses of 10Hz
  repetition rate, i.e. 100s.
• All the data shown below are raw (w/
  B.G.), whereas the B.G. is very low.
                                                3
4
Det. 16 counts in 100s




                         5
6
Example: PMT data @ B=0




                          7
Example: PMT data @ 1T




                         8
Example: PMT data @ 2T




                         9
Example: PMT data @ 3T. Note: #9, #11
were already choked by magnetic field




                                        10

				
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