Performance of a micro-channel plates position sensitive detector

Liénard, E.; Herbane, M.; Ban, G.; Darius, G.; Delahaye, P.; Durand, Dominique; Fléchard, X.; Labalme, M.; Mauger, F.; Méry, A.; Naviliat‐Cuncic, O.; Rodriguez, D. Rodriguez

doi:10.1016/j.nima.2005.06.069

Cited by 61 publications

(44 citation statements)

References 14 publications

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“…These data were then sorted to include only events for which each of the four delay line signals was present in addition to the main MCP signal [44], and none of the QDC channels had their saturation flag set. The delay-line signals were used to reconstruct the position information for the event, while the cycle-by-cycle main MCP signal versus time was extracted from the sorted ROOT files and placed into matrices for each run.…”

Section: Discussionmentioning

confidence: 99%

“…Since the recoil ions typically have very low kinetic energies (E max ≈ 452 eV [25]), they are re-accelerated to 3.2 · q keV, where q is the charge state of the ion, before impinging on the MCP surface. Typically, MCP detectors provide good efficiency for ions above 3 keV [44], however, they can be affected by variations of the efficiency across the surface as well as gradual deterioration caused by impinging energetic particles, resulting in decreased efficiency. Careful investigation of the pulse height distributions for recoil events from this experiment ( fig.…”

Section: Energy-dependent Mcp Efficiencymentioning

confidence: 99%

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First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

et al. 2016

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Abstract. The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the β + decay of 35 Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (MCP) detector with a time-stamp precision of 2 ns and position resolution of 0.1 mm due to the newly upgraded data acquisition based on the LPC Caen FASTER protocol. The number of recoil ions was measured for more than 15 different settings of the retardation potential, complemented by dedicated background and half-life measurements. Previously unidentified systematic effects, including an energy-dependent efficiency of the main MCP and a radiation-induced time-dependent background, have been identified and incorporated into the analysis. However, further understanding and treatment of the radiation-induced background requires additional dedicated measurements and remains the current limiting factor in extracting a betaneutrino angular correlation coefficient for 35 Ar decay using the WITCH spectrometer.

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Section: Discussionmentioning

confidence: 99%

Section: Energy-dependent Mcp Efficiencymentioning

confidence: 99%

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

et al. 2016

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“…The signal is delivered by the MCPPSD whose performances are detailed in Ref. [13]. For each coincidence event, the positions of both particles, the recoil ion ToF, the β particle kinetic energy, the time stamp of the decay within the cycle and the RF phase of the trap are recorded.…”

Section: The Lpctrap Setupmentioning

confidence: 99%

“…At GANIL, the 6 He 1+ beam is produced by the fragmentation of a primary 13 C beam at 75 MeV/u on a graphite target coupled with an ECR source. The lowenergy beam is delivered at 10 keV through the LIRAT beam line with a maximum intensity of about 1.5×10 8 pps.…”

Section: Measurements In the Decay Of 6 Hementioning

confidence: 99%

Precision measurements in nuclear ‐decay with LPCTrap

et al. 2013

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The experimental achievements and the current program with the LPCTrap device installed at the LIRAT beam line of the SPIRAL1-GANIL facility are presented. The device is dedicated to the study of the weak interaction at low energy by means of precise measurements of the β−ν angular correlation parameter. Technical aspects as well as the main results are reviewed. The future program with new available beams is briefly discussed. The β−ν angular correlationThe structure of the weak interaction remains an important topic in the area of fundamental interaction physics. In particular, at low energies, there are nowadays ambitious experimental programs to search for "exotic" currents beyond the V-A theory [1,2]. Such studies have recently made significant progress with the advent of improved trapping techniques [3,4]. These sophisticated setups allow the production of β-decay sources almost at rest and confined in small volumes that can be surrounded by suitable detectors [5,6]. We describe here the achievements made with the LPCTrap setup installed at GANIL 1 . The experimental program is dedicated to precision measurements of the β−ν angular correlation parameter.From a theoretical point of view, the generalization of Fermi's theory leads to consideration of five different Lorentz invariant contributions in the transition amplitude describing nuclear beta decay, which are referred to as scalar (S), vector (V), tensor (T), axial-vector (A) and pseudoscalar (P). The search for S and T exotic contributions can be performed through a precise measurement of the β−ν angular correlation parameter, a βν . For allowed transitions and nonoriented nuclei, this parameter can be directly inferred from an events distribution linked to the angular correlation between the leptons [7]. GANIL: Grand Accélérateur National d'Ions LourdsSince neutrinos are difficult to detect, a sensitive observable for a β−ν angular correlation measurement is a kinematic parameter of the recoiling daughter nucleus. If the β particles and the recoil ions are detected in coincidence and the relative time of flight (ToF) is measured between the two particles, the expected distribution of events in the electron energy and recoil ion time of flight, t, is for all solid angles detected:where T e , E e and r(t) denote the kinetic and total energies of the β particle and the recoil ion momentum, respectively. Q is the energy available in the transition, K is a constant and F(± Z, E e ) is the Fermi function (β − and β + decays). The parameter a βν and the Fierz interference term b depend on the coupling constants, C i and C i (i = S, V, T, A), associated to the different contributions [7]:

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“…1) whose entrance and exit are defined by two additional 90% transmission grids. Inside the tube, an electrostatic lens at −250 V permits a 100% collection efficiency of the ions by a micro-channel plate position sensitive detector (MCPPSD) [21]. A −4 kV voltage applied on the front plate of the MCPPSD ensures a detection efficiency close to maximum for all charge-states of the recoil ions, independently of their initial kinetic energy.…”

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confidence: 99%

Electron shakeoff following theβ+decay of trapped35Ar+ions

et al. 2013

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The electron shakeoff of 35 Cl atoms resulting from the β + decay of 35 Ar + ions has been investigated using a Paul trap coupled to a recoil-ion spectrometer. The charge-state distribution of the recoiling daughter nuclei is compared to theoretical calculations accounting for shakeoff and Auger processes. The calculations are in excellent agreement with the experimental results and enable to identify the ionization reaction routes leading to the formation of all charge states.

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Performance of a micro-channel plates position sensitive detector

Cited by 61 publications

References 14 publications

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

Precision measurements in nuclear ‐decay with LPCTrap

Electron shakeoff following theβ+decay of trapped35Ar+ions

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