A large area ring-imaging Cherenkov detector has been designed to provide clean hadron identification capabilities in the momentum range from 3GeV/c to 8GeV/c for the CLAS12 experiments at the ...Jefferson Lab upgraded 12GeV continuous electron beam accelerator facility. The adopted solution foresees a novel hybrid optics design based on an aerogel radiator, composite mirrors and densely-packed and highly-segmented photon detectors. Cherenkov light will either be imaged directly (forward tracks) or after two mirror reflections (large angle tracks). The status of the aerogel mass-production and the assessment studies of the aerogel optical performance are here reported.
•Mass-produced large-area aerogel fulfills CLAS12 hybrid-optics RICH specifications.•Unprecedent transmittance for n=1.05 hydrophilic aerogel has been achieved.•The effect of moinsture absoprtion of hydrophilic aerogel has been investigated.•Aerogel contributions to the Cherenkov angle resolution have been studied in detail.•A novel not-invasive method to measure the aerogel surface planarity was developed.
Full text
Available for:
GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
In spring 2003 the FINUDA detector was installed at the
ϕ factory DAΦNE in the Laboratori Nazionali di Frascati of INFN (Italy). In October 2003 the commissioning of the apparatus was accomplished ...and the first data taking started with a set of nuclear targets
6Li,
7Li,
natC,
27Al,
51V. The data collection will continue until a total integrated luminosity of
250
pb
−1
is recorded. Light and medium
A hypernuclei will be abundantly produced by the strangeness exchange reaction induced by the stopped
K
−
coming from the decay of
ϕ
(
1020
)
mesons.
The aim of the experiment is to simultaneously measure the excitation energy spectra of the produced hypernuclei, with a resolution better than 1 MeV, the lifetime of the
Λ embedded in the different hypernuclei and the partial widths
Γ
π
,
Γ
n
p
and
Γ
n
n
for mesonic and non-mesonic hypernuclear decays. Information on neutron-rich hypernuclei and rare hypernuclear two-body decays might be available too, with the statistics that will be collected at the end of the run.
In the present paper, first results concerning in-beam detector calibration, spectrometer performances and very preliminary hypernuclear formation and decay spectra will be presented.
Full text
Available for:
GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, SAZU, SBCE, UL, UM, UPCLJ, UPUK
43.
Single photon detection with the multi-anode CLAS12 RICH detector Contalbrigo, M.; Aaron, E.; Balossino, I. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2019, Volume:
952, Issue:
C
Journal Article
Peer reviewed
Open access
Recently, the first module of the hybrid-optics large-area CLAS12 RICH at JLab has been put into operation using for the first time the well known Hamamatsu H8500 MAPMT and the new single-photon ...dedicated H12700, for a total of about 400 MAPMTs and 25000 pixels. The photon detector must efficiently detect single photons in the visible and near-UV light region, provide a fast response for background rejection and pattern recognition, and have a spatial resolution of less than 1 cm over an area of ≈1 m2. Each front-end readout unit is composed of three electronic boards with specific tasks directly connected to groups of 2 or 3 sensors. The core of the readout is composed of MAROC3 and FPGA chips. The MAROC3 chip is able to discriminate the 64 signals from one MAPMT and to produce 64 corresponding binary outputs with 100% efficiency starting at a small fraction of the single-photon signal, while the FPGA chip provides 1 ns TDC capability with 8 μs maximum latency and acts as a DAQ controller. The system is created to be almost dead-time free at the foreseen 20 kHz CLAS12 trigger rate. The best working conditions for single-photon detection have been studied at laser stands, test beams, and with the JLab electron beam data. A report of the photon detector preparation, commissioning and operation is here discussed.
Full text
Available for:
GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Abstract
The performances of an optical readout of Time Projection Chambers (TPCs) with multiple Gas Electron Multipliers (GEMs) amplification stages are presented. The detector is characterized by ...using
55
Fe photons converting inside a 7 litre sensitive volume detector in different electric field configurations. This prototype is developed as part of the R&D for the CYGNO project for an application to direct Dark Matter search by detection of tracks of nuclear recoils in the gas within the keV energy range.
Here, the first module of a Ring Imaging Cherenkov detector has been recently installed on the CLAS12 spectrometer at the Jefferson Lab (JLab) to provide the experiment with kaon identification in ...the momentum range between 3 and 8 GeV/c. The detector adopts a hybrid optics solution with aerogel radiator, light planar and spherical mirrors and highly-segmented photon detectors. We report here on the assembly and installation of the RICH and we show the first preliminary results obtained during the commissioning of the detector and the first physics data taking.
Full text
Available for:
GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
46.
The large-area hybrid-optics RICH detector for the CLAS12 spectrometer Mirazita, M.; Angelini, G.; Balossino, I. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2017, Volume:
876
Journal Article
Peer reviewed
Open access
A large area imaging Cherenkov detector is under construction to provide hadron identification in the momentum range between 3 and 8GeV/c for the CLAS12 exeperiment at the new 12GeV electron beam of ...the Jefferson Laboratory (JLab). The detector adopts a hybrid optics solution with aerogel radiator, light planar and spherical mirrors and highly-segmented photon detectors. Cherenkov photons will be imaged either directly (for forward tracks) or after two mirror reflections (large angle tracks). The status of the detector construction is here reported.
•A RICH detector for the CLAS12 spectrometer in the Hall B of the JLab is under construction.•The RICH will identify kaons in the momentum range between 3 and 8 GeV/c.•The RICH has a proximity focusing geometry with aerogel radiator, photomultipliers and mirrors.•The configuration has been validated by a testbeam performed at CERN using a hadron beam.•Results of the tests of mirrors, Multi Anode Photomultipliers and electronics are shown.
Full text
Available for:
GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
A high resolution TPC based on GEM optical readout Mazzitelli, G.; Antochi, V. C.; Baracchini, E. ...
2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC),
2017-Oct.
Conference Proceeding
The R&D work of a gas detector for high precision particle tracking over large gas volumes is presented. The scintillation light accompanying the electronic avalanches in a triple GEM structure is ...detected by a CMOS-based camera. The sensor provides a high granularity along with low noise and a very high sensitivity (70% of quantum efficiency). Once operated with a large aperture and suitable focal length lens, large areas can be imaged at reduced costs. The performance of a prototype (called LEMOn), with a 7 litre sensitive volume, operated with a He/CF 4 (60/40) mixture was studied on a 450 MeV electron beam and preliminary results are presented. A space resolution on the plane parallel to the GEM (X, Y) of 90 \mu m was achieved in the whole sensitive volume. The effect of the electron diffusion on the drift was studied and exploited in order to evaluate the position in Z of the tracks. An innovative element is the concurrent readout of the light with a suitable photomultiplier system. It will complement the CMOS-readout by providing the time resolution necessary to the reconstruction of third coordinate of each cluster. By exploiting the time information, a resolution of 60 \mu m on Z was measured. Such a detector can be an interesting candidate for future large scale experiments searching for Dark Matter (DM) searches with directional sensitivity and for measurements of coherent neutrino scattering on nuclei. Additional applications of this detector might be in the realm of neutron detection, X-ray polarimetry and particle cancer therapy.
The proposed CYGNO experiment is a one cubic meter, single-phase, gas-only Time Projection Chambers (TPCs) for Directional Dark Matter search. The particularity of CYGNO is the read-out technique ...based on Micro Pattern Gas Detector (MPGD) amplification of the ionization and on the collection of the yielded visible light by a scientific CMOS camera with a sub-mm position resolution. A corresponding fast light detection, through PMT or SiPM devices, allows reconstructing of the three-dimensional direction of the tracks enabling to distinguish the electron and nuclear recoils. The time performance of the photodetector and the time resolution of the acquisition system directly affects the capability in reconstructing the inclination of tracks. The performance of the different solutions is studied to guide the choice for the final application. The best PMT and SiPM, among those examined, are installed on LIME, a 50 litres CYGNO prototype. Optical signals and fast electrical signals of this detector are studied in this work
PDF
