Request for a Test Exposure of OPERA Targets in the NuMI Beam Page: 3 of 24
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experiment in the context of the world wide effort to determine the neutrino
mass mixing matrix. The OPERA detector has been optimized to detect
a significant sample of v, interactions by the subsequent observation of r
production and decay .
The OPERA target is a massive emulsion detector made in a sandwich
structure of lead plates and layers of nuclear emulsion. For historical reasons
this arrangement has been called an Emulsion Cloud Chamber or ECC. The
ECC concept, which has many advantages over the use of bulk emulsion,
has been used in the DONUT experiment. The ECC detector is capable of
measuring non-nuclear fragment individual tracks, coming from the primary
neutrino interaction vertex with their three dimensional slopes and momenta.
It is also capable of electron identification with good e/y separation, due to its
very fine segmentation. The OPERA ECC target modules are constructed as
bricks of dimensions 12.5 x 10.0 x 7.5 cm3 in horizontal, vertical and along the
beam axis. Each brick consists of series of a 56 (1 mm thick) plates of passive
material (lead or iron) alternated with emulsion films (43 Pm emulsion layer
on both sides of a transparent 200 pm thick plastic sheet). See Figure 1.
In preparation for OPERA we would like to expose the OPERA target
modules to a beam of neutrinos. This will allow us to test many of our
analysis procedures and techniques as well as to validate the simulation of
neutrino interactions, both for the production of forward and backward par-
ticles. Although the ME (medium energy) beam of NuMI would be a better
match to the CNGS energy, data acquired with the NuMI LE (low energy)
beam would serve the same purpose, albeit more challenging. Given the high
interaction rate from the NuMI beam, the test detector target mass can be
kept low and additional detectors can easily be built around a small target.
These type of measurements are not possible in the CNGS beam, since it has
no short baseline hall.
2 The Detectors
For the requested exposure two independent target setups are proposed.
They would be arranged side-by-side at the same z location. The first one,
labeled EDDS, uses multiple ECC bricks and the DONUT scintillating fiber
tracker (SFT). This configuration is optimized for the detection of a large
number of events. The second set up, labeled SBHD, uses a single ECC brick
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Kodama, K.; U., /Aichi; Tzanakos, G.; U., /Athens; Baller, B.; Lundberg, B. et al. Request for a Test Exposure of OPERA Targets in the NuMI Beam, report, November 1, 2004; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1013457/m1/3/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.