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<p class="MsoNormal">Thanks Greg, </p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ll review this and set up a meeting with Jlab Industrial Hygiene to discuss the chemical usage when I get back in town.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Marc McMullen<o:p></o:p></p>
<p class="MsoNormal">Sr. Instrumentation Designer<o:p></o:p></p>
<p class="MsoNormal">Detector Support Group<o:p></o:p></p>
<p class="MsoNormal">(757) 269-7738<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="border:none;padding:0in"><b>From: </b><a href="mailto:gkalicy@jlab.org">Grzegorz Kalicy</a><br>
<b>Sent: </b>Sunday, October 2, 2022 4:40 PM<br>
<b>To: </b><a href="mailto:mcmullen@jlab.org">Marc Mcmullen</a><br>
<b>Cc: </b><a href="mailto:dsg-eic_dirc@jlab.org">dsg-eic_dirc@jlab.org</a><br>
<b>Subject: </b>Re: DIRC laser lab daily operations</p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hi Marc,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Here is the daily operation description. Let me know if this is what you had in mind or something else should be added.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Cheers,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Greg <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">"<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">The DIRC QA lab located in EEL108 will be used to evaluate synthetic fused silica bars received from SLAC for their mechanical and optical quality.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">The lab will have four parts:</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">a) bar cleaning station with:</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 1) table for unpacking, chair</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 2) temporary storage rack</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 3) table for visual inspection, chair</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 4) halogen light for visual inspection</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">b) cleaning station with</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 1) table</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 2) shallow basin to collect waste water</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 3) short-term storage rack</span><span style="font-size:10.0pt;color:#550055"><br>
</span><span style="font-size:12.0pt;color:black"> 4) cart with cleaning supplies</span><span style="font-size:10.0pt;color:#550055"><br>
</span><span style="font-size:12.0pt;color:black">c) laser lab in interlocked darkroom with:</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 1) optical table with laser setup: HeCd laser, set of standard optics components to guide the laser through bar, photodiodes, multimeter</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 2) table or cart with DAQ computer</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black"> 3) chair</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">d) long-term storage: cabinet to store up to 600 bars (17x35x1225 mm each)</span><span style="font-size:10.0pt;color:black"><br>
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</span><span style="font-size:12.0pt;color:black">Operation:</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">The bar will be unpacked at the cleaning station (a) and placed into temporary storage.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">Next the bar will be inspected for surface damage and pollution using the halogen light.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">Bars requiring cleaning will be processed at the cleaning station (b) using either a chemical (acetone or isopropanol) or an abrasive (Hastelite) cleaning method.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">The inspected bar is either placed in long-term storage (d) or mounted in holders for easier handling and in a short-term storage rack for processing in the laser lab (c). The bars go to<span class="apple-converted-space"> </span></span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">long-term storage (d) after the laser measurement.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">All activities will be performed by a trained expert dressed in protective gear (gloves, mask, goggles, and lab coat)</span><span style="font-size:10.0pt;color:black"><br>
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</span><span style="font-size:12.0pt;color:black">Bars in the short-term storage rack are moved to the dark room (c).</span><span style="font-size:10.0pt;color:#550055"><br>
</span><span style="font-size:12.0pt;color:black">A single bar is being mounted in the optical setup.</span><span style="font-size:10.0pt;color:#550055"><br>
</span><span style="font-size:12.0pt;color:black">Before the laser is turned on the expert controls the optics of setup, ensures that the laser beam s contained by beam dumps and side panels attached to the optical table to prevent unwanted laser reflections.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">The optical quality of the bar end surfaces and bulk material is determined by shining the laser along the long axis of the bar, measuring the effective attenuation length.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">The coefficient of total internal reflection of the bar will be determined using the same setup after the bar and mirror are moved to create a different entry angle for the laser on the bar end, creating up
to 52 internal reflections.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">In both cases the laser intensity is monitored by two diodes.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">The measurement is started using a pre-programmed sequence on a DAQ computer.</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">The trained expert will wear the appropriate laser safety gear (goggles, lab coat).</span><span style="font-size:10.0pt;color:black"><br>
</span><span style="font-size:12.0pt;color:black">The presence of the expert inside the laser lab darkroom will be required for placing the bar into the laser, starting the measurements and changing the mirror/bar positions, and may be required for occasional
manual measurements.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">"<o:p></o:p></span></p>
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<p class="MsoNormal"><img border="0" width="463" height="2" style="width:4.8194in;height:.0208in" id="Horizontal_x0020_Line_x0020_1" src="cid:image002.png@01D8D6F8.094FD550"><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Marc Mcmullen <mcmullen@jlab.org><br>
<b>Sent:</b> Monday, September 26, 2022 10:43 AM<br>
<b>To:</b> Grzegorz Kalicy <gkalicy@jlab.org><br>
<b>Cc:</b> dsg-eic_dirc@jlab.org <dsg-eic_dirc@jlab.org><br>
<b>Subject:</b> DIRC laser lab daily operations</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hi Greg,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">When you have time, can you send over the expected daily operations for the lab.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I'll use this as a template to develop the Task Hazard Analysis.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Also, I need a list of the chemicals needed for cleaning and specific details on the cleaning process you mentioned in the meeting.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">We can then plan the space outside the laser controlled area.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Marc<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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