2 Introduction
Brookhaven National Laboratory and collaborators
started a neutrino
working group to identify new opportunities in the field of
neutrino oscillations and explore
how our laboratory facilities can be used to explore this field
of research. The memo to the working group and the charge are
included in Appendix I.
This report is the result of the deliberations of the working group.
Previously, we
wrote a letter of intent to build a new high intensity neutrino beam
at BNL [1].
A new intense proton beam will be used to produce
a conventional horn focussed neutrino beam directed at a detector
located in either the Homestake mine in Lead, South Dakota
at 2540 km or the Waste Isolation Pilot
Plant (WIPP) in Carlsbad, NM at 2880 km [2, 3].
As a continuation of the study that produced the letter of intent,
this report examines several items in more detail.
We mainly concentrate on the use of water Cherenkov detectors
because of their size, resolution, and background rejection
capability, and cost. We examine the prospects of building such a
detector in the Homestake mine.
The accelerator upgrade will be carried out in phases.
We expect the first phase to yield a 0.4 MW proton beam and the
second phase to result in a 1.0 MW beam. The details of this
upgrade will be reported in a companion report. In this report
we assume accelerator intensity of 1 MW for calculating
event rates and spectra. We also assume a total experimental duration
of 5 years with running time of 107 seconds per year.
We examine the target station and
the horn produced neutrino beam with focus on two topics:
target and horn design for a 1 MW beam and the broad band spectrum of
neutrinos from a 28 GeV proton beam.