The New Post is up
Posted: Thu Jul 21, 2011 3:20 pm
Hello All,
The newest post is up.
The blog passed 10,000 pageviews on June 30th!
This new post is a very long review Joe Khachan's work.
http://thepolywellblog.blogspot.com/201 ... sults.html
Post Summary:
==========
This models the 2010 Sydney experimental paper and contains ideas similar to those in their 2011 modeling paper. But, this predates that paper by five months and is not peer reviewed. A ~6 cm Teflon device with 10 turns of copper wire was put ~30 cm away from an electron emitter in a bell jar at 0.015 torr. A probe, measuring electrons was in the ring center and 2,500 amps of direct current (at 450 volts) went into the rings. At full strength, the rings push apart with a ~0.2 Newton force. Tests explored how the trapping changed with chamber pressure, ring current and electron injection voltage. The use of Teflon, aluminum and 304 steel is critiqued. The ring design of ~21 mm spaced apart rings is critiqued for having excess metal (it is now known that rings are spaced so that the joint and axis fields equal.)
The physics of the electron for one test (ring current: 625 amps, pressure 15 mTorr, beam voltage: 15 KeV) is modeled. The electron is made using thermionic emission, feels an electrostatic Lorentz force pushing it the ~10 cm to the rings. The gas has a mean free path of ~6 meters. The average electron arrives at the rings in ~7.2 nanoseconds, going ~2.5E7 m/s and experiences a ~0.013 tesla field (per ring). First, the electron beam is treated as uniform. If it has 1 degree between the magnetic and velocity vectors, the magnetic is higher than the electric Lorentz force and the electrons are caught. Next, electron velocities are modeled like a spreading bell curve using a Wiener process, where an interaction takes 320 attoseconds and exchanges 3.2E-21 joules of energy. This predicts ~23 million interactions inside the beam before reaching the rings. The beam has a ~1 cm diameter with density of 1E8 electrons/cm^3 and is modeled over a 0.5 cm chunk. With a 3 degree difference, this predicts the slowest (~1.4E7 m/s) and fastest (~3.2E7 m/s) moving electrons will both be caught. Modeling is not done after fill up. The number of electron transits (~42,000) is found using a lifetime of 100 msec and a transit distance of ~6 cm. 155 volts measured in ring center means ~10 billion electrons were trapped.
The paper indicated that electron trapping generally peaked at an ideal ring current – this supports a tunable machine. This observation is connected to magnetic mirror theory. The ratio of particle velocity and characteristic field length is compared to the electron gyroradius. When the ratio is higher than the radius, the mirror fails. As the ring current dissipates, the ratio falls. When the ratio is less than the radius, the mirror works and electron containment spikes, this supports a “peak” ring current. An experts assessment is called for. Next the mirror ratio (the ratio of the max and min magnetic fields) and loss cone concepts are discussed. FF Chen’s textbook explanation and a difference between it and the papers definition are included. Results suggest that lowering the pressure and raising electron injection voltage improves trapping. A price of $12,000 for equipment is estimated.
The newest post is up.
The blog passed 10,000 pageviews on June 30th!
This new post is a very long review Joe Khachan's work.
http://thepolywellblog.blogspot.com/201 ... sults.html
Post Summary:
==========
This models the 2010 Sydney experimental paper and contains ideas similar to those in their 2011 modeling paper. But, this predates that paper by five months and is not peer reviewed. A ~6 cm Teflon device with 10 turns of copper wire was put ~30 cm away from an electron emitter in a bell jar at 0.015 torr. A probe, measuring electrons was in the ring center and 2,500 amps of direct current (at 450 volts) went into the rings. At full strength, the rings push apart with a ~0.2 Newton force. Tests explored how the trapping changed with chamber pressure, ring current and electron injection voltage. The use of Teflon, aluminum and 304 steel is critiqued. The ring design of ~21 mm spaced apart rings is critiqued for having excess metal (it is now known that rings are spaced so that the joint and axis fields equal.)
The physics of the electron for one test (ring current: 625 amps, pressure 15 mTorr, beam voltage: 15 KeV) is modeled. The electron is made using thermionic emission, feels an electrostatic Lorentz force pushing it the ~10 cm to the rings. The gas has a mean free path of ~6 meters. The average electron arrives at the rings in ~7.2 nanoseconds, going ~2.5E7 m/s and experiences a ~0.013 tesla field (per ring). First, the electron beam is treated as uniform. If it has 1 degree between the magnetic and velocity vectors, the magnetic is higher than the electric Lorentz force and the electrons are caught. Next, electron velocities are modeled like a spreading bell curve using a Wiener process, where an interaction takes 320 attoseconds and exchanges 3.2E-21 joules of energy. This predicts ~23 million interactions inside the beam before reaching the rings. The beam has a ~1 cm diameter with density of 1E8 electrons/cm^3 and is modeled over a 0.5 cm chunk. With a 3 degree difference, this predicts the slowest (~1.4E7 m/s) and fastest (~3.2E7 m/s) moving electrons will both be caught. Modeling is not done after fill up. The number of electron transits (~42,000) is found using a lifetime of 100 msec and a transit distance of ~6 cm. 155 volts measured in ring center means ~10 billion electrons were trapped.
The paper indicated that electron trapping generally peaked at an ideal ring current – this supports a tunable machine. This observation is connected to magnetic mirror theory. The ratio of particle velocity and characteristic field length is compared to the electron gyroradius. When the ratio is higher than the radius, the mirror fails. As the ring current dissipates, the ratio falls. When the ratio is less than the radius, the mirror works and electron containment spikes, this supports a “peak” ring current. An experts assessment is called for. Next the mirror ratio (the ratio of the max and min magnetic fields) and loss cone concepts are discussed. FF Chen’s textbook explanation and a difference between it and the papers definition are included. Results suggest that lowering the pressure and raising electron injection voltage improves trapping. A price of $12,000 for equipment is estimated.