BobHiggins MFMP

  • Member since Oct 13th 2014
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  • BobHiggins

    Replied to the thread me356: Photos of AURA control unit.
    Post
    (Quote from Eric Walker)

    Actually the details of the Patterson cell are pretty well known. Dennis Cravens was working with CETI during that time. In fact, Dennis still has an original Patterson cell with its beads. George Miley also had access to the…
  • BobHiggins

    Replied to the thread me356: Photos of AURA control unit.
    Post
    (Quote from Bob)

    The Me356 test will be run at Me356's location. Bob Greenyer, Ryan Hunt, Alan Goldwater, and Brian Albiston are known to be traveling there, but Emanuele may be along to document the experience in video. He is behind the camera in many…
  • BobHiggins

    Replied to the thread Replication Attempt for This Week.
    Post
    BTE-Dan
    Suhas seems willing to supply details on everything and Bob Greenyer is keen to document everything. Suhas has been designing a single tube reactor for a customer and has said he will help design a replica single tube reactor for MFMP to…
  • BobHiggins

    Post
    I have added a Photos folder in the Google drive folder showing the setup of the system with the field coil, audio power amplifier, and the neutron detector.

    https://drive.google.com/drive…VRSjZkLXgyOTA?usp=sharing

    There are also a couple of photos of…
  • BobHiggins

    Post
    Can
    The columns should be identified in the column header in the .csv file. Column 7 or G (column label 4, CoilTop) is J-type measurement of a temperature in the top corner of the field coil. Column 19 or S (column label 16, Neu CPS) is the counts…
  • BobHiggins

    Post
    This last calibration run is complete and its data is on the Google drive in the folder listed above. It was a stepped exercise from 100°C to 600°C in 100°C steps. Each step included PID hold at the temperature before and after the .wav…
  • BobHiggins

    Post
    Today I have a short calibration test running - up to a core temperature of 600°C. I want to take some baby steps and look for problems in the system and how the field coil is surviving the temperature in the environment. I may have to circulate air…
  • BobHiggins

    Replied to the thread Replication Attempt for This Week.
    Post
    For a plasma lamp, a truly refractory tube is not needed. You just water cool the envelope because the envelope can be at a far lower temperature than the plasma. As I described in the case of the continuously pumped YAG laser, water cooled lamps have…
  • BobHiggins

    Replied to the thread Replication Attempt for This Week.
    Post
    (Quote from Can)

    Most IR cameras and IR thermometers measure the IR in the far infrared. When illuminating the interior of an alumina tube with a white light LED, the light is reddened because the blue light is scattered far more effectively than the…
  • BobHiggins

    Replied to the thread Replication Attempt for This Week.
    Post
    The fact that the light can escape without the envelope of the tube being high temperature is a well known design principle for plasma lamps. Take for example the high pressure arc lamps used to pump continuous YAG lasers. The lamp is lit by a high…
  • BobHiggins

    Post
    Well, today I think I have ironed out the oscillation problem and the software bugs. From my changes and tests today, I expect to have far better lock-in on the setpoint temperature and proper PID operation on a subsequent hold after the .wav…
  • BobHiggins

    Replied to the thread Replication Attempt for This Week.
    Post
    (Quote from axil)

    You cannot deal in averages - it doesn't work. Look at the spectral transmittance of sapphire - alumina will have that transmittance but with wavelength dependent scattering. Do some research, don't just speculate.
  • BobHiggins

    Replied to the thread Replication Attempt for This Week.
    Post
    (Quote from axil)

    Jack said he had a hot coil (filament) inside. The coil (filament) may be well above 1000°C. The light from that high temperature coil (filament) is transmitted through the cooler alumina shell, which is at 350°C. Then you end up…
  • BobHiggins

    Replied to the thread Replication Attempt for This Week.
    Post
    (Quote from axil)

    Axil, you are just wrong! Do the experiment. Even at room temperature alumina is translucent. The material has a high degree of scattering, but passes most of the incident light. You can easily make this measurement with a laser…
  • BobHiggins

    Replied to the thread Replication Attempt for This Week.
    Post
    BTE-Dan
    I believe most of the evaluations of the Me356 reactor as a black box and the ECCO DC plasma reactor as a full open description should be completed by early June - testing is imminent. Let's set some expectations. The test of the Me356…
  • BobHiggins

    Post
    Can
    If you zoom the time scale around the excitation and the subsequent increase in heater power, you will see that the increase in heater power occurs after the excitation has completed with time between. It is a bad choice for the heater to be…
  • BobHiggins

    Post
    Can
    Can you expand the Y of the temperature around the excitation so you can see 1-2°C shifts in the temperature after the excitation and zoom in from just left of the excitation to about 800s to the right of the excitation? It may take a graph…
  • BobHiggins

    Post
    Alan Smith
    This test was not fueled - it was a dummy run for calibration. It shows internal heating from the time varying magnetic field which is a good sign that the stimulus is a significant excitation. So, when it is is operated with a fuel, is…
  • BobHiggins

    Post
    Can
    Thanks. I don't even have that graph yet. In this, you see the first 2 excitation currents behaving normally. The third current shows the oscillation - I had to manually shut OFF the amplifier to get the oscillation to stop. I tried manually…
  • BobHiggins

    Post
    Today I am going to add a resistor to the input of the audio PA to hopefully snub the tendency of the system to oscillate after playing the .wav file. The output impedance of the sound card in the PC (headset port) is low and there is no reason to…