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Hi Marc,</div>
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Here is the daily operation description. Let me know if this is what you had in mind or something else should be added.</div>
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Cheers,</div>
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Greg </div>
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<font size="-1" style="caret-color:rgb(0, 0, 0)"><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">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><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">The lab will have four parts:</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">a) bar cleaning station with:</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 1) table for unpacking, chair</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 2) temporary storage rack</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 3) table for visual inspection, chair</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 4) halogen light for visual inspection</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">b) cleaning station with</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 1) table</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 2) shallow basin to collect waste water</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 3) short-term storage rack</span><font color="#550055"><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 4) cart with cleaning supplies</span><br>
</font><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">c) laser lab in interlocked darkroom with:</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 1) optical table with laser setup: HeCd laser, set of standard optics components to guide the laser through bar, photodiodes, multimeter</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 2) table or cart with DAQ computer</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> 3) chair</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">d) long-term storage: cabinet to store up to 600 bars (17x35x1225 mm each)</span><br>
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<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Operation:</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">The bar will be unpacked at the cleaning station (a) and placed into temporary storage.</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Next the bar will be inspected for surface damage and pollution using the halogen light.</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">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><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">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). T</span><span style="caret-color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; display: inline !important; color: rgb(0, 0, 0);">he bars go to</span><span style="caret-color:rgb(0, 0, 0);font-family:-webkit-standard;font-size:medium;display:inline !important"><span class="Apple-converted-space" style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> </span></span><br style="caret-color:rgb(0, 0, 0)">
<span style="caret-color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; display: inline !important; color: rgb(0, 0, 0);">long-term storage (d) after the laser measurement.</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">All activities will be performed by a trained expert dressed in protective gear (gloves, mask, goggles, and lab coat)</span><br>
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<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Bars in the short-term storage rack are moved to the dark room (c).</span><font color="#550055"><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">A single bar is being mounted in the optical setup.</span><br>
</font><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">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><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">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><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">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><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">In both cases the laser intensity is monitored by two diodes.</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">The measurement is started using a pre-programmed sequence on a DAQ computer.</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">The trained expert will wear the appropriate laser safety gear (goggles, lab coat).</span><br>
<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">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.</span></font><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> 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</font>
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Hi Greg,</div>
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When you have time, can you send over the expected daily operations for the lab. <br>
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I'll use this as a template to develop the Task Hazard Analysis.</div>
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Also, I need a list of the chemicals needed for cleaning and specific details on the cleaning process you mentioned in the meeting.
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We can then plan the space outside the laser controlled area.</div>
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Regards,</div>
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Marc<br>
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