groups:tankwhite [Assay and Acquisition of Radiopure Materials]

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====== Ultra-sensitive Immersion Tank Schedule and Cost Estimate ======

===== I.	Liquid scintillator enclosed in nylon bag =====


==== a.	Assume linear alkyl benzene (LAB) for LS ====

=== i.	$500 / barrel from Petresa Canada in Becancour, QB ===

1.	MSDS is attached\\
2.	Does not include cost of fluor or wavelength shifter, which depends on choice of detector/PMT\\

=== ii.	Volume ===

1.	Are we still using a 2-meter diam. sphere surrounded by the hallway and toroid?\\
2.	A 2-meter diam. sphere = 922 gal. (imperial) = 1,107 gal. (U.S.)\\
a.	I think Canada uses imperial.\\
b.	I think Petresa uses 50-gallon barrels.\\
c.	Assume 1,000 gallons @ $500 per 50-gallon drum\\

=== iii.	Cost: $10,000 ===


==== b.	Nylon bag ====

=== i.	Company:  Lanxess.com ===

1.	Borexino CTF nylon provided by Bayer Chemical which is now Lanxess.  I am still trying to get through to a representative, I’ve talked to the secretary of the CEO and I’ve left numerous voice mail messages at the number she gave me.\\
2.      Durethane, semi-crystalline\\
3.      Sales rep for that division: Brendan Dooley (412) 809-3545\\
4.	President or CEO of company: Randy Dearth (412) 809-3600 (reaches a secretary or assistant who gave contact info for Brendan Dooley)\\

=== iii.	Cost: $500,000 - $1,000,000 (according to Cristian) ===


===== II.	Detector array =====


==== a.	Assume QUPIDs ====

=== i.	Under development by UCLA and Hamamatsu ===

1.      Contact person: Katsushi Arisaka\\
2.      $5,000 per detector\\
3.      Does not include Borexino-type light concentrator, which may not be required with lower radioactivity of QUPIDs (can be positioned closer to fiducial volume)\\

=== v.	How many QUPIDs are required? ===

1.	Assuming the front face of a 3” diam. detector is inscribed by a square of area 3” x 3”, and that these squares completely cover the surface of a 2-meter diam. sphere, ~2170 detectors are required.\\
2.	However, 6” QUPIDs may also be an option; the number to completely cover the sphere would be ~542.\\
3.	Complete coverage is not necessary; the Borexino CTF only used 100 PMTs.\\
4.	Let’s assume 100 QUPIDs.\\

=== vi.	Cost: 100 QUPIDs @ $5,000 ea. = $500,000 ===

==== b.	Electronics ====

=== i.	Cost: 100 readout channels @ $2,000 ea. = $200,000 ===

1.      Katsushi has a cost estimate for a readout chain (HV power supply, pre-amp, ADC) of $2,000 / channel.\\  
2.      I have his design along with the models and specs which was sent out to the MAX collaboration, but I’m not sure if that is privileged information since it is still under development at UCLA.\\

==== c.	Support structure and outer vessel ====

=== i.	Support structure for QUPIDs ===

1.      We need some sort of support structure for QUPIDs (QSUP) even though we want to minimize the amount of materials within the “inner sanctum."\\

2.      The detectors would of course surround the fiducial volume of LAB, and could be in an outer “layer” of LAB or water, enclosed perhaps by another nylon bag a la Borexino CTF.\\

3.      If we take the upper estimate for the fiducial volume nylon bag above, i.e., $1M, then maybe we just need to add in the cost of a QSUP.\\

=== iv.	Cost: ??? ===

===== III.	Total cost of materials: $1,710,00 plus cost of QSUP =====

===== IV.	Schedule =====

==== a.	Assuming that we can place an order for the detectors (whether they be QUPIDs or something else) in a timely fashion, the biggest time constraint is the assembly of the structures (the nylon bag or bags, the support structure for the detectors, and possibly an exterior structure. ====

==== b.	Cristian estimates that it would take 2-3 technicians about 6 months to assemble the nylon bag. ====

===== V.	Personnel =====

==== a.	3 technicians working in a class-100 clean room environment (Princeton?) for 6 months ====

==== b.	(Technician? Student(s)?) assembling QSUP ====

==== c.	Postdoc(?) working on electronics ====

==== d.	Postdoc or student working on characterization and purity of LS cocktail ====

==== e.	??? ====
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