LINAC test 31.01.23

In previous tests, we achieved vacuum and then turned off the pump.

Here we will try to keep the pump running.

This test also differs from the previous one, that we moved the cathode back a little.

00002: power supply

Step	Step description	Expected result	Result
Precondition	System is Off
Switch On the system	turn on the power supply (P1)	Get continuous power (6 V)	positive
Switch Off the system	turn Off the power supply (P1)	Continuous power stops	positive
Postcondition	System is Off

00003: Get electrons

Step	Step description	Expected Result	Result
Precondition	System is Off
Switch On the pump	turn On the pump	95% vacuum	positive
Switch on the system	Turn on the power supply	Get continuous power (6 V)	positive
Burning the Tungsten (or use a electron gun)	Burn the Tungsten by supplying it with 6 V power	Get electrons around the Tungsten (the lamp will light)	positive (the lamp turned on)
Switch Off the power supply	turn Off the power supply	the lamp will turn Off	positive
Switch Off the pump	turn Off the pump	the pump stops pulling out the air	positive
Postcondition	System is Off

00004:High voltage

Step	Step description	Expected Result	Result
Precondition	System is Off
Switch On the system	Turn On the HV	Get continuous power ( between 5 Kv and 60 Kv )	positive
Switch Off the system	Turn Off the HV	Continuous power stops	positive
Postcondition	System is Off

00005: Acceleration of electrons

Step	Step description	Expected Result	Result
Precondition	System is Off
Switch On the pump
Switch On the power supply
Switch on the High Voltage	Turn on the HV power supply	Get continuous power ( between 5 Kv and 60 Kv )	positive
electrons acceleration	Connecting the high voltage to the anode and the cathode (while controlling the change of force until we see the passage of electrons and their acceleration)	Electrons leaving the anode accelerate towards the cathode and collide with it	positive ( light appears between the anode and the cathode)
Switch Off the HV	Turn off The HV power supply	Electrons acceleration Stop	positive
Switch Off the power supply	turn Off the power supply	the lamp will turn Off	positive
Switch Off the pump	Turn Off the pump	the pump stops pulling out the air	positive
Postcondition	System is Off

Analysis of the test results:

In this test, we used a lamp with filaments of good thickness, and we attached tungsten to these filaments.

Then we supplied the lamp with a power of 6 V, and it lit up, which indicates that we have obtained electrons.

After this stage, we turned on the high voltage, and we saw a violet light path, which indicates that electrons are moving quickly between

the anode and the cathode.

But the problem was that the light path was tortuous and not straight + the tungsten was burned due to air entering it, This led to the appearance of a white powder inside the tube.

But despite the burning of the tungsten, we still have electrons (due to the presence of high voltage) and they continue to cross the path.

When we turned on the pump and kept it running, the path of the electrons began to adjust and became almost straight.

And after a while, with the pump still running, the violet color started to go, as electrons continued to cross its path.

Turning on the 6 v and high voltage:

After a while, the tungsten burned out , but electrons continued to pass through:

Here we started running the pump continuously:

with the pump on, the color gradually began to fade, as the path became straighter:

Here we turned off the pump, the color came on again and the track started meandering:

This white powder that appeared after the combustion of tungsten:

Combustion of tungsten:

What we have to do:

-we will run the pump from the beginning of the test until its end, to make sure that the burning of the lamp and the appearance of powder was due to the air that entered.

-HV experiment without providing the lamp with another power supply (6 V)