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Line 20: − + − *New o-rings have been purchased to repair both the leaks in the window mounts and the "spark plugs". − *The front window has been cracked and will need replacement. − *A new window has been purchased from [http://www.latticeoptics.com/web/ Lattice Electro Optics] in California. The window has the following specs: − **Material: CaF2 (calcium fluoride) − **Dimensions: 36mm diameter, 5mm thickness − **Scratch-Dig: 20-10 − **Surface Flatness: λ/10 − **Quantity: 2 − *Argon (99.995 % or better) and Fluorine/He (99.9 % or better, mixed in Helium) gas are going to be purchased from Air Gas. − *I have dismantled the portion of the laser which blocks access to the spark plug array. After replacing all 45 o-rings I will contact Dr. Hines again and check my work with the helium leak detector at operating pressure (2200mbar). The pictures below show the laser with the thyratron, MSC, and capacitor array removed. − {| cellpadding="3" style="text-align:center; margin: 1em auto 1em auto" − |- − |[[Image:laser_guts.jpg|thumb]]|| || [[Image:laser_removed.jpg|thumb]]|| || [[Image:spark_array.jpg|120px]]|| || [[Image:spark_corrosion.jpg|thumb]] − |- − |} − *44 of 45 spark plugs have been reinstalled with new o-rings. The brass nut on the last plug stripped due to corrosion while trying to extract it. Here is a picture of what it looks like − *Performed secondary leak check using the Veeco helium leak detector. We were able to actively maintenance the plugs to ensure that each one was "leak free". After filling the system with 2200mbar (operating pressure) the leak rate was determined to be 10mbar/hour. Still two times greater than the excepted leak rate of 5mbar/hour. − *The last plug is believed to be the main leak source as bubbles can be seen escaping from the site when Snoop leak detector is used. Plans are being made to extract this corroded/stripped/seized nut. − *After much deliberation, it has been decided that the only way resolve the leak problem is to remove the spark plug array completely. This will allow us to remove the stripped nut. − *The array has been removed from the lasing cavity and the nut was extricated using an "Easy Out" and a T- wrench. The photos below illustrate the process and capture the elusive inner cavity of the excimer laser. − {| cellpadding="3" style="text-align:center; margin: 1em auto 1em auto" − |- − |[[Image:inside_angle.jpg|thumb]]|| [[Image:array_inside.jpg|thumb]]|| || [[Image:extracted_nut.jpg|thumb]]|| [[Image:wide_inside.jpg|thumb]]|| || [[Image:crust_ring.jpg|thumb]] − |- − |} − *The system has been pressurized to 2200mbar (operating pressure) and will be checked again within 24hrs to obtain the leak rate. If found to be less than 5mbar/hr the system will be reconstructed and tested for light output after the new window is received. −
Diamond Radiator Thinning Using an Excimer Laser (view source)
Revision as of 02:29, 13 December 2016
, 02:29, 13 December 2016→Updates for February 2010
laser optics
laser optics
==Updates for February 2010==
==Focal Study==
==Updates for March 2010==
==Updates for March 2010==