The half megatesla obtained by the Pulsotron – 2 thermonuclear fusion test machine at the core of the plasma was an magnetic record

In the January 2014 test programme in Madrid,  the ignition conditions with pressures higher, not only than those in other experimental teams, but also than those initiated in nuclear bombs  were reached, also new “RBR” plasma temperature sensors measured 278 million degrees centigrade which is 55 times hotter than he temperature on the surface of the sun.

The incredible obtained, close to half a megatesla, leaves far behind the 1 kilotesla of any other z – pinch machines.


Magnetic field strength tests result

Also in some of the tests it was tested specific targets that will be filled with aneutronic fuel. It is discussed here the use of Boron Hydride at Pulsotron machines:

The new RBR sensors suffered high power blasts from 24 tests, being exposed to high temperatures and high pressure shock waves.  In the fourth test, malfunctions were detected in two of the sensors, the Pulsotron test team disassembled the sensor tower so discovering that the protection quartz window of the four sensors was completely broken.  It was quickly repaired replacing the broken window with a thicker one that faced up to the rest of the tests without damage.


RBR sensors installed at the test tower before and during the blasts

It could also be confirmed that plasma compressed to ten times less diameter under extreme compression by measuring the radiation peaks that emerge from the plasma ball when it is decompressed after decreasing the magnetic field and also its pressure.  The radiation peak wavelength is in the x – rays range as long as it is not detected in the far photodiode sensor as could be seen in the scope plots and also in the Test Analyser software:



Radiation peaks scope plot


Radiation peaks shown at the Test analyser

 In three of the tests an unexpected second blast was detected 300 milliseconds after the first, unfortunately the Madrid test laboratory is dark and it was not possible to see , even in the high speed video, what happened  between both shots


Second phantom blast

In total 24 tests were carried out ,  17 of them reached Ignition Pressure conditions, another one failed due to scope trigger and the other six failed due to internal instabilities and because the internal pressure of the plasma surpassed the magnetic pressure.


Test results

 During the test campaign Pulsotron – 2 also obtained fantastic images using a low resolution high speed camera:



High speed low resolution captures

 The images were joined in following youtube video:

 Nevertheless not all went well during the tests, once again the electromagnetic radiation sensor that worked perfectly in the laboratory, oscillated again when installed in the Pulsotron site and could not be used.  Therefore the technical team has decided to dispose of it and substitute it for another, possibly based on a high speed Schottky diode.

About jlopez2022

Experimental Physicist
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