<html><body><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000"><div>Hello Jennifer,</div><div>Thanks a lot.</div><div>Regards,</div><div>Valery</div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Jennifer Williams" <jennifer@jlab.org><br><b>To: </b>"Valery Kubarovsky" <vpk@jlab.org><br><b>Sent: </b>Wednesday, November 16, 2016 11:55:43 AM<br><b>Subject: </b>Re: Hall B RICH ODH form<br></blockquote></div><div data-marker="__QUOTED_TEXT__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><div class="moz-cite-prefix">Hello Valery,<br> Thank you for forwarding the form. <br> The amount of nitrogen for this detector will not change ODH status in Hall B. <br> The status will remain ODH-0.<br> I will post this form to our ODH files.<br> Jennifer<br> <br> <br> <br> On 11/15/2016 5:40 PM, Valery Kubarovsky wrote:<br></div><blockquote cite="mid:1845933768.4380016.1479249623705.JavaMail.zimbra@jlab.org"><div style="font-family: arial,helvetica,sans-serif; font-size:
12pt; color: #000000" data-mce-style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000;"><div><br></div><div><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">Jennifer,</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">We have a new detector to be installed in Hall-B: Ring Imagine Cherenkov Counter. We will use aerogel as a radiator.</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">In order to preserve the aerogel optical performance, the RICH box environment must</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">be kept dry by fluxing nitrogen. The nitrogen system supplies the amount of gas</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">necessary to fill the box (about 236 ft^3) and to compensate for the gas leakage.</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">A complete refill of the volume per day is expected under normal operating conditions.</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">A slight overpressure of 0.5 mbar prevents from the contamination from the outside air.</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">The Hall-B volume is 452578 ft^3. Please take a look to the ODH safety review form.</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><br></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">Thanks,</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">Valery</span></p><p style="margin: 0px; font-size: 12px; line-height: normal;
font-family: Helvetica;" data-mce-style="margin: 0px; font-size: 12px; line-height: normal; font-family: Helvetica;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">Hal-B staff scientist</span></p><p><br></p><p><br></p></div></div></blockquote><p><br></p><br></blockquote></div></div></body></html>