55813045
The DIRC detectors of the PANDA experiment at FAIR
Abstract The P¯ANDA experiment at the planned FAIR facility at GSI, Darmstadt aims at measuring hadronic final states with unprecedented precision and luminosity. Superior particle identification of charged and neutral particles is mandatory to fulfil P¯ANDA's physics aims. DIRC (detection of internally reflected Cherenkov light) counters are foreseen for charged particle identification. A barrel DIRC will cover the central region while a disc DIRC will provide particle identification in the forward region. Three DIRC concepts differing in the radiator geometry and method for dispersion correction are studied. Results are presented on the common issues of radiator material and quality. Photon detection will be discussed as well.
122031325
PiP — a large solid angle scintillation telescope for detecting protons and pions
Abstract A ∼ 1 sr solid angle scintillation detector hodoscope for protons of up to ∼ 280 MeV and positive pions of up to ∼ 180 MeV energy has been developed for use in (γ,pN), ( γ ,p π ± and ( γ , π + N) experiments with tagged photons. This paper reports the detailed design of the hodoscope and its performance for detecting protons and positive pions.
96911852
THE CRYSTAL BALL AT MAMI
120740000
FGLD: a novel and compact micro-pattern gas detector
Abstract A new gas detector which combines in the same structure the gas amplification mechanism and the position sensitive readout, named the field gradient lattice detector (FGLD), is being developed at CERN. The detector, reminiscent in geometry of a multi-wire proportional chamber but with a different field configuration can be fabricated as two or more layers of micro-patterned parallel tracks on a variety of substrate materials. Two preliminary proof-of-concept designs without position sensitivity have been fabricated as copper tracks of 50 μ m width and 150 μ m pitch on polyimide in a 3D geometry and on epoxy in a 2D geometry. They have been shown to detect the 5.9 keV X-rays of an 55 Fe source with a stable gain ranging from 500 to 5000 in a 3 mm drift chamber containing an argon carbon-dioxide gas mixture. The elegance and compactness of the FGLD design make it a very attractive gas detector solution both economically and mechanically. Most interestingly, the 3D FGLD design on flexible polyimide should greatly simplify the mechanical challenges of gas chamber assembly in planar and cylindrical detector designs.
123023484
Development of a fast proton range radiography system for quality assurance in hadrontherapy
Abstract We describe the development of a Proton Range Radiography system with an imaging area of 30×30 cm 2 for two dimensional mapping of the integrated density in a target. Proton transmission radiographic images are produced by measuring, with a pair of position-sensitive detectors (GEM chambers), the direction of the protons transmitted through the patient and, with a stack of scintillators, the residual range of the protons leaving the patient. To match the data rate requirements of an in-beam diagnostic, a novel data acquisition system for the tracking detectors has been designed to operate at 1 MHz data flow. Laboratory tests exposing the GEM detector with high flux X-rays confirm the fast response of the new data acquisition system. Images of several phantoms have been recorded to demonstrate the GEM position accuracy.