[Dsg-ltcc] leak rate

[Maurizio Ungaro]

Hi Amrit,

The boxes were leak tested in two ways:

1. sniffing freon from around the box - fixing all detectable leaks
2. filling the boxes with nitrogen and checking that, taking atmospheric pressure into account, the box hold the pressure

We didn't quantify the leaks.

David, who is cc-end and did this work, can provide further details. He did it three times:

1. as preparation, in TED.
2. once the boxes were in the hall
3. once the boxes were mounted on the forward carriage.

He found considerable leaks in both 1 and 3 cases.

Regarding your question  on the LTCC window. 
That was 3mils or mylar = 0.0762mm, which has radiation length of 285 mm.
So radiation length X/X0 = 0.0267%.

It was sandwiched betwen 1.5 mils of tedlar, I think it has similar rad length.

Regards,
Mauri







> On Apr 14, 2017, at 11:53 AM, Amrit Yegneswaran <yeg at jlab.org> wrote:
> 
> hello,
> 
> i see from my records that the ltcc leak test was performed jul/aug of 2015.
> i do not have records of what the leak rate was at that time.
> all i have e-mails saying that the leak test was successful and that the ltcc were taken to the hall before the final seal was done.
> 
> i'm sure that someone has a record of the leaks, for each sector, that were measured at that time.
> i would like to compare the present leak rate with that measured at that time.
> 
> thank you for your help.
> sincerely
> amrit
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