LPPFusion
LPPFusion
Flip the Power!
  • Home
    • About
    • Mission
    • Team
    • Board of Advisors
    • Fusion FAQ
    • Contact
  • News
    • News
    • Reports
    • Albums
  • Subscribe
    • Subscribe!
  • Investing
    • Focus Fusion Benefits
    • Business Development Plan
      • Focus Fusion Timelines
      • Goals and Milestones
    • Cost Advantage and ROI
    • Investing In LPPFusion
  • Environment
    • Eliminate Fossil Fuels
      • Climate Change
    • Solar and Wind Alone Can’t Do It
    • Impact of Fusion
  • Technology
    • Fusion Energy Generator
    • X-Scan Inspection Tech
  • Science
    • Cosmic Connection
      • Questions and Answers on Observations that Challenge Universal Expansion Hypothesis
    • Physics Foundations
    • Space Propulsion
  • Papers
  • Patents
MENU CLOSE back  

Preionization Tests Prepare for New Shots

You are here:
  1. Home
  2. Aneutronic, Aneutronic and DPF
  3. Preionization Tests Prepare for New Shots
April 6, 2016


The second main source of impurities in previous FF-1 shots has been vaporization of the anode material by runaway electrons. These high-energy electrons occur very early in the pulse, when the plasma has not yet become fully ionized—in other words, when only a few electrons are free to move outside of atoms. The cure for these runaways that the LPPFusion team has proposed is preionization: a very small initial pulse of current smooths the way for the big pulse by producing lots of ionization—many electrons free to move. This is like deliberately producing an electron traffic jam—many electrons moving slowly rather than a few moving so fast that they can vaporize tungsten.

 

After the successful bake-out, Hassan and Lerner turned to testing the preionization, recording the shots with video cameras. The images showed that the preionization currents were flowing in narrow bands, only about 0.5 mm in radius, opposite each cathode vane. This is good news, because it means ionization levels will be high (good traffic jams) and the main current will also be tightly concentrated, encouraging filament formations, which in turn leads to higher density plasmoids and more fusion reactions. However, they also found that in some conditions, the preionization occurred unevenly, concentrated at some of the cathode vanes but not others. That would lead to asymmetrical main pulses and poor compression of the plasma, thus poor fusion yields. By varying the current supplied to the preionization pulses and the amount of time between them, the team was able to obtain symmetrical preionization, as shown in this video. The video was taken from a window looking up at the electrodes from a little off-axis, which shows almost half of the circle of vanes on the cathode. The team is still studying and optimizing the preionization process.

Preionization Pulse

Fig. 2 A preionization pulse lights up the plasma between the tungsten cathode (outer circle) and anode (inner circle). Each glowing line connects with one cathode vane. From this window about half of the 16 vanes are visible. The left- and right-most discharges appear dimmer only because of the perspective of the camera.

 

During the preionization tests, a couple of electrical components failed in the power supply system that feeds current to the capacitors. As a final step in preparing for new shots, the team is replacing these components with more robust ones that can hold off higher voltages.

 

While these tests were ongoing, Chief Information Officer Ivy Karamitisos and IT associate Jose Varela upgraded the data system that will record, process and back-up data from the shots. They also improved communication links with several instruments, including the Residual Gas Analyzer that measures oxygen and water levels in the chamber, and a new Geiger counter, which will be used to detect short-lived radioactive isotopes produced during shots.

 

This news piece is part of the April, 2016 report. To download the report click here.
FacebookshareTwittertweet

Related posts

LPP Fusion LOGO
Plasma Focus Researchers Agree on Key Point
November 10, 2019
Oscillations-August-9-Shot-1
Oscillations Down, Fusion Yield Up
November 10, 2019
After-Shot-2-August-27-2019-Main-Trigger
Tracking Down FF-2B’s Problematic Oscillations
September 13, 2019
State House Annex, Trenton, NJ
NJ Legislature to Fund Fusion? See LPPFusion Presentation at NJ Fusion Symposium
August 2, 2019
Oscillations in Shot 6 on June 7, 2016
Annual Fusion Conference in Poland Helps LPPFusion Plan Next Steps
August 2, 2019
Log Intensity
LPPFusion Reports Highest Plasma Purity at PLASMA 2019 Conference
August 2, 2019
Updates

FacebookTwitter

 
Videos

YouTubeVimeo

 
Books

Big Bang Never Happened Cover

Alerts!

Tell Congress: Support Fusion!

New Capital Drive

Subscribe

Vote - Fusion Song Contest!

Photos
After-Shot-5-August-27-2019-Main-Trigger After-Shot-4-August-27-2019-Main-Trigger After-Shot-2-August-27-2019-Main-Trigger Be Electrodes After 44 Shots Be Electrodes After First Shot Ivy Renames FF Be with Vacuum Chamber Beryllium Cathode Attached to the Support Structure Vacuum Chamber and Drift Tube Copper Wrapped
Contact Info
Lawrenceville Plasma Physics, Inc. DBA LPPFusion
  • Address
    128 Lincoln Blvd. Middlesex, NJ 08846-1022
  • Telephone
    (732) 356-5900
  • Fax
    (732) 377-0381

Find us on:

FacebookTwitterYouTubeFlickrVimeo
Newsletter

Copyright © 2019 LPPFusion