<html><body><div style="font-family: tahoma,new york,times,serif; font-size: 14pt; color: #009900"><div>hi bert,<br></div><div>as tyler says it is indeed urgent.<br data-mce-bogus="1"></div><div>if you are unavailable, let us know the alternate.<br data-mce-bogus="1"></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Tyler Lemon" <tlemon@jlab.org><br><b>To: </b>"Bert Manzlak" <manzlak@jlab.org><br><b>Cc: </b>"Amrit Yegneswaran" <yeg@jlab.org>, "Patrizia Rossi" <rossi@jlab.org><br><b>Sent: </b>Thursday, July 13, 2017 10:00:25 AM<br><b>Subject: </b>Re: [Dsg-rich] Moving RICH reflectivity test station from EEL 108A to EEL 121b<br></div><div><br></div><div data-marker="__QUOTED_TEXT__"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000" data-mce-style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000;"><div>Bert,<br></div><br><div>Can we move the refelctivity test station to EEL 121b small clean room and operate the test station without the dark box? It is critical that we measure the reflectance of the RICH mirrors as soon as possible as their manufacturer is waiting on the results.<br></div><br><div>Specifications for the alignment laser and test lamp beam are in my previous email. If you need to see the test set-up before it is moved, I will be in EEL 108A with the test set-up this morning.<br></div><br><div>Best regards,<br></div><div>Tyler<br></div><br><hr id="zwchr"><div><b>From: </b>"Tyler Lemon" <tlemon@jlab.org><br><b>To: </b>"Bert Manzlak" <manzlak@jlab.org>, "dsg-rich" <dsg-rich@jlab.org><br><b>Sent: </b>Wednesday, July 12, 2017 4:46:20 PM<br><b>Subject: </b>[Dsg-rich] Moving RICH reflectivity test station from EEL 108A to EEL 121b<br></div><br><div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000" data-mce-style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000;"><div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000" data-mce-style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000;"><div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000" data-mce-style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000;"><div>Hello Bert,<br></div><br><div>Since you are Laser Safety Officer, we have a question regarding the test set-up we are using to measure RICH mirror's reflectivity. The tests use a laser to align the optics of the test set-up before taking data. I submitted the BList (http://devweb.acc.jlab.org/CSUEApps/hblist/task/1555) for this tasks last week and it has since been approved.<br></div><br><div>During the tests, we have found that the actual spherical mirrors for RICH are too big to fit in the existing darkbox in EEL 108A. Would we be able to operate the test set-up without the dark box enclosure?</div><br><div>To solve the problem of the mirrors being to big, we would like to move the entire test set-up into the small clean room in EEL 121b and remove the darkbox. The dark box is not needed in the small cleanroom because the room has already been darkened for other RICH mirror tests. Without its dark box, the beam of the test set-up's alignment laser and also the test lamp beam would no longer be completely enclosed.</div><br><div>The alignment laser specifications and test lamp details are below. <br></div><br><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;"><strong>Alignment Laser</strong></span><br></div><div>WITHOUT NEUTRAL DENSITY FILTER:<br></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Class</span>: 3R<br></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Central Wavelength</span>: 635 nm<br></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Power</span>: 2.7 mW<br></div><br><div>WITH NEUTRAL DENSITY FILTER OF OPTICAL DENSITY 1.0:<br></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Central Wavelength</span>: 635 nm<br></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Power</span>: 0.27 mW<br></div><br><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;"><strong>Test Lamp:</strong></span><strong> </strong></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Wavelength:</span> ranges from 300nm - 650 nm during test.</div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Max Power</span>: ~10 nW at ~600 nm<br></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Test Beam Diameter</span>: 1 mm<br></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Test Beam Divergence:</span> 10 mrad<br></div><div><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;">Description:</span> Test lamp is a 50-W quartz-tungsten halogen lamp that passes through a monochromator. The internal optics of the monochromator diffract the lamp's light into the desired wavelength and collimate the light into a test beam diameter of 1 mm. Power of test beam ranges from ~2 nW to ~10 nW over range of wavelengths used.<br></div><br><div>Please let us know whether we can operate the test set-up without the dark box enclosure. It is <span style="color: rgb(255, 0, 0);" data-mce-style="color: #ff0000;"><strong>urgent</strong> </span>that we complete these tests as soon as possible because we need to get back to the mirror's manufacturers on the quality of their coating.<br></div><br><div>If you need to take a look at the test set-up, I will be available tomorrow morning.<br></div><br><div>Best regards,<br></div><div>Tyler<br></div><br></div><br></div></div><br>_______________________________________________<br>Dsg-rich mailing list<br>Dsg-rich@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/dsg-rich<br></div></div><br>_______________________________________________<br>Dsg-rich mailing list<br>Dsg-rich@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/dsg-rich</div></div><br></div></div></body></html>