Changes

==Updates for May 2010==

==Updates for May 2010==

*After reinstalling the new 304L steel fluorine gas line, the red light seen in the passivation procedure lasted over 11.5 minutes. However, the laser beam is still on the 5 minute time scale.

*After reinstalling the new 304L steel fluorine gas line, the red light seen in the passivation procedure lasted over 11.5 minutes. However, the laser beam is still on the 5 minute time scale.

*Using a[[Media:coherent_sensor.pdf|Coherent J45LP-MUV]] pyro-electric energy sensor coupled to an oscilloscope, it is now possible to observe the laser beam quantitatively.  

*Using a [[Media:coherent_sensor.pdf|Coherent J45LP-MUV]] pyro-electric energy sensor coupled to an oscilloscope, it is now possible to observe the laser beam quantitatively.  

*A maximum of 140mJ has been seen from the initial pulses reaching a fluence of <math>17J/cm^2.</math>.

*A maximum of 140mJ has been seen from the initial pulses reaching a fluence of <math>17J/cm^2.</math>.

*It was thought that the gas was being contaminated by the act of recirculation within the laser cavity via the gas processor. To test this, the beam energy was first monitored every ten seconds with a standard fill (150mbar <math>F_2</math>, 350mbar Ar, 1700mbar He) and ran at 10Hz/26kV. After a new fill, the high voltage was increased from zero to 26kV (and held for 5 seconds) on every ten second mark and then on every one minute mark. If the circulation of the gas is to blame for the decrease in energy, then I expected to see the energy to drop as the original continuously running at 26kV) trial. This is what I saw after the three runs,

*It was thought that the gas was being contaminated by the act of recirculation within the laser cavity via the gas processor. To test this, the beam energy was first monitored every ten seconds with a standard fill (150mbar <math>F_2</math>, 350mbar Ar, 1700mbar He) and ran at 10Hz/26kV. After a new fill, the high voltage was increased from zero to 26kV (and held for 5 seconds) on every ten second mark and then on every one minute mark. If the circulation of the gas is to blame for the decrease in energy, then I expected to see the energy to drop as the original continuously running at 26kV) trial. This is what I saw after the three runs,

{| cellpadding="3" style="text-align:center; margin: 1em auto 1em auto"

{| cellpadding="3" style="text-align:center; margin: 1em auto 1em auto"

|-

|-

| [[Image:Energy_Time.png|left|thumb|300px|Beam energy w.r.t. time]] || &nbsp; ||  

| [[Image:Energy_Time.png|left|thumb|500px|Beam energy w.r.t. time]] || &nbsp; ||  

  [[Image:Energy_Pulse.png|right|thumb|300px|Beam energy w.r.t. the number of pulses]]

  [[Image:Energy_Pulse.png|right|thumb|500px|Beam energy w.r.t. the number of pulses]]

|-

|-

|}

|}