We present a liquid nitrogen (LN2) cooling station for
the high-purity germanium (HPGe) segmented clover detectors of the
ELI-NP Array of DEtectors
(ELIADE) spectrometer, including its associated filling control and
monitoring systems, all designed and built in-house at Extreme Light
Infrastructure - Nuclear Physics (ELI-NP), Măgurele,
Romania. The automated LN2 filling process is controlled by a
CompactRIO (cRIO) system from National Instruments through a custom
LabVIEW software used for monitoring both the internal germanium
crystal temperatures as well as the temperatures of external Pt100
sensors (used for detection of overflow of LN2 from detectors
during a filling process). The detectors are filled with LN2 by
opening their individual filling valves (which are mounted on the
cooling station) and the process is automatically stopped once an
overflow condition is fulfilled by the corresponding external Pt100
sensor located downstream. A twelve-hour cycle is used to
periodically fill all of the detector dewars and keep their
germanium crystals cool at all times. The associated Graphic User
Interface (GUI), Command Line Interface (CLI) and Text User
Interface (TUI) are used for both controlling and monitoring the
above mentioned process. Alert and warning email messages were also
enabled via the cRIO system so that users can be alerted in
real-time in the event of any cooling malfunction. In this way, any
issues related to the cyclic filling procedure, as well as any
abnormal observations regarding the germanium crystal temperatures
can be quickly and efficiently addressed before the detectors have a
chance to warm back up to room temperature. Temperature data of all
the Pt100 sensors corresponding to detectors as well as to the
solenoid valves are made available in an influx database by the cRIO
control system. The web application Grafana access the database and
plots them in real-time for online monitoring.
The Extreme Light Infrastructure-Nuclear Physics (ELI-NP) is a facility dedicated to nuclear physics research with extreme electromagnetic fields. The expected gamma-ray beams with energies up to 20 MeV, 0.5% relative energy resolution and ~10 8 photons per second intensity will allow precise photonuclear measurements. Nuclear structure experiments will involve photo-excitations of mainly low-spin collective states and the observation of the radiation emitted in the subsequent decays. Photoneutron reactions and elastic and inelastic photon scattering are proposed to be recorded using a mixed gamma-neutron detection system using LaBr3:Ce, CeBr3, BC501A and GS20 detectors. Photoneutron (γ,xn) with x=1,2 reactions cross sections measurements will be performed with a 4π flat efficiency neutron detection system dedicated for neutron multiplicity sorting experiments. The detection system is comprised of 3 He counters embedded in a moderator block. The paper will introduce the experimental setups dedicated to studies of the nuclear Giant Dipole Resonance excitation mode using the high energy resolution and high intensity ELI-NP gamma-ray beams. The feasibility studies performed using extensive Geant4 simulations, results of detector tests will be presented.
ELIGANT is one of the main set of instruments for nuclear physics experiments with the versatile gamma-beam system that will be available at ELI-NP. One of the devices in the ELIGANT collection of instruments is the ELIGANT-GN, comprising of both neutron and γ-ray detectors. The description and details of the mechanical structure designed to hold the ELIGANT-GN neutron detectors is discussed in this report. In addition, the progress of the the implementation of this structure will be shown.
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