The Nu-SNS proposal - ORNL Physics Division - Oak Ridge ...

A program of neutrino cross section measurements that are important for understanding
nucleosynthesis as well as supernova dynamics would follow these initial measurements on iron
and carbon. This program is extremely cost effective since the sensitive components can be
reused with new target materials. For example, a measurement of the neutrino cross section on
16 O could be performed in the liquid detector by exchanging the mineral oil with water with
minimal added expense. Measurements of the neutrino cross section on lead, which is important
for understanding how neutrinos may effect the synthesis of heavy elements and for
understanding the response of terrestrial supernova neutrino detectors, could be performed with
only the added cost of the lead target material. Accurate neutrino cross section measurements on
such relatively simple nuclei spanning a wide mass range (A = 16, 58, and 208) would be a
crucial first step toward assessing and eventually improving the reliability of neutrino-nucleus
cross section calculations. Measurements on lighter, odd-Z nuclei (such as aluminum in the
segmented detector) and a very precise measurement of the neutrino cross section on deuterium
(using heavy water in the liquid detector) would be excellent candidates for the next set of
measurements. There is also strong interest in testing supernova neutrino detector prototypes at
the ν-SNS facility.
The choice and ordering of targets is determined by many factors, both scientific and practical.
Given the broad interest in neutrino cross section measurements and the wide array of potentially
interesting targets and detectors, we envision that ν-SNS would be a user facility with a Program
Advisory Committee to make recommendations as to priorities for the scientific program beyond
the initial set of measurements on iron, water and mineral oil targets.
2.6 High Level Cost and Schedule
Table 2.1 shows the estimated unescalated costs for top-level project components in FY05 $K.
The total comes to $8,575K, with $2,022K (31%) contingency. We estimate an additional $440K
in Other Project Costs (preparation of a conceptual design report, R&D and pre-ops). With a
Total Project Cost (TPC) exceeding $5M, ν-SNS must adhere to DOE Order 4.13.3. We believe
the construction project can be completed in a period of three years. The profile resulting from
these considerations in as-spent dollars (including escalation) is shown in Figure 2.7. From this
we can derive the ν-SNS TPC of $9,934K.
Table 2.1 Unescalated ν-SNS cost summary for top-level work breakdown
structure elements (in FY05 $K).
WBS #
Title
Cost w/o
Contingency Contingency Total
Contingency
Fraction
1.1 Bunker 2,256 564 2,819 25%
1.2 Veto 1,059 377 1,436 36%
1.3 Segmented Detector 1,155 427 1,582 37%
1.4 Homogeneous Detector 1,189 452 1,641 38%
1.5 Utilities 229 62 291 27%
1.6 Safety System 63 17 80 27%
1.7 DAQ 258 64 323 25%
1.8 Project Management 344 59 403 17%
Total 6,553 2,022 8,575 31%
ν-SNS Proposal 14 8/4/2005