[Dsg-ltcc] ltcc leakage rates.

[Maurizio Ungaro]

Hi Amrit,

These rates are rather big. Where do they come from? 
David took many precautions to ensure the box was tight. We didn't quantify it but I would gess the remaining leaks we had were order of magnitudes below these.


Thanks,

Mauri

> On Apr 26, 2017, at 2:52 PM, Amrit Yegneswaran <yeg at jlab.org> wrote:
> 
> brian, marc, and george measured the leakage rates of the ltcc sectors  over an extended period of time.
> based on these measurements the results are
> sector 
> C4F10
> L/day
> C4F10 kg/day
> 1
> 95
> 1.06
> 2
> 32
> 0.36
> 3
> 118
> 1.32
> 4
> 38
> 0.43
> 5
> 27
> 0.30 
> 6
> 101
> 1.13
> 
> sectors 2, 4 and 5 are best.
> sectors 1, 3, and 6 are worst.
> 
> as we have 155 kg of C4F10, and it takes 73 kg  to fill a sector we could in principle use any of the sectors for a 30 day run period, e.g. engineering run.
> of-course best would be to select a sector from 2,4,and 5.
> 
> we advise against the removal of the good sectors (2,4, and 5), as it appears the leaks are caused during the process of installation and/or removal.
> 
> for physics runs, if the RICH could be installed in sector 1 we could run run with sectors 2, 4, an 5 at a cost of:
> filling: 3*73kg =219kg -> cost = 219kg*170 $/kg = $37230.
> leakage(ops) : (0.36+0.43+0.30) 1.1kg/day -> cost 1.1kg/day*170 $/kg= 187$/day
> 
> 
> 
> 
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