[Dsg-rich] Hall B RICH ODH form

[Valery Kubarovsky]

Hello Jennifer, 
Thanks a lot. 
Regards, 
Valery 

> From: "Jennifer Williams" <jennifer at jlab.org>
> To: "Valery Kubarovsky" <vpk at jlab.org>
> Sent: Wednesday, November 16, 2016 11:55:43 AM
> Subject: Re: Hall B RICH ODH form

> Hello Valery,
> Thank you for forwarding the form.
> The amount of nitrogen for this detector will not change ODH status in Hall B.
> The status will remain ODH-0.
> I will post this form to our ODH files.
> Jennifer

> On 11/15/2016 5:40 PM, Valery Kubarovsky wrote:

>> Jennifer,

>> We have a new detector to be installed in Hall-B: Ring Imagine Cherenkov
>> Counter. We will use aerogel as a radiator.

>> In order to preserve the aerogel optical performance, the RICH box environment
>> must

>> be kept dry by fluxing nitrogen. The nitrogen system supplies the amount of gas

>> necessary to fill the box (about 236 ft^3) and to compensate for the gas
>> leakage.

>> A complete refill of the volume per day is expected under normal operating
>> conditions.

>> A slight overpressure of 0.5 mbar prevents from the contamination from the
>> outside air.

>> The Hall-B volume is 452578 ft^3. Please take a look to the ODH safety review
>> form.

>> Thanks,

>> Valery

>> Hal-B staff scientist
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