NeuLAND - FAIR

7. Production, Quality Assurance and
Acceptance Tests
NeuLAND will be assembled from ready-bought scintillator bars and photomultipliers.
The RP408 scintillator bars with its light-guides will be ready-made including wrapping
for reflection and light-tightness. The technical details are specified in sections 5.2.1
and 5.2.2. In-factory acceptance tests will ensure the specified quality for the mass
production for each supplier.
The choice of light readout is detailed in section 5.2.3. The selected photomultipliers
can be purchased including the voltage dividers. Here, as well, quality assurance will be
provided by in-factory acceptance tests.
The quality of the readout electronics TacQuila is assured by a in-factory acceptance
test, for which GSI provides a test setup for the involved company.
We foresee the assembly of scintillator bars and photomultipliers at the GSI/FAIR site,
for practical reasons. During and after assembly, the constant delivery quality of the
provided detector components will be proven by on-site tests. The light-tightness of the
NeuLAND submodules will be inspected after mounting of the read-out. Measurements
with radioactive sources will be utilized to characterize each submodule, partly with
its read-out electronics. As a result of these measurements parameters as the lightattenuation
length will serve for the quality control of each NeuLAND submodule.
In addition, samples will be drawn, for which a sophisticated test procedure will be
applied. These samples will be exposed to an electron beam, e.g. at the ELBE facility,
in order to check the time resolution of the selected modules, see section 3.3.
After the arrangement of 100 NeuLAND submodules into one double-plane, this doubleplane
with its final read-out electronics and its final high-voltage supply units will be
tested, either using radioactive sources, again, or cosmic rays, see also section 8.2.
79