[Dsg-ltcc] ltcc leakage rates.

[Amrit Yegneswaran]

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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