Performance of an LAPPD in Magnetic Fields

Jinky Agarwala,Andrea Bressan,Chandradoy Chatterjee,Silvia Dalla Torre, Mauro Gregori,Stefano Levorato,Anna Martin,Saverio Minutoli,Mikhail Osipenko, Richa Rai,Marco Ripani,Fulvio Tessarotto

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT（2025）

INFN

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Abstract

Magnetic fields affect the response of Micro-Channel Plate (MCP)-based detectors, although the effect is smaller than that for conventional photo-multiplier tubes. The main effect of the field is a reduction in gain and efficiency. In this article, we report our studies of the effects of the magnetic field on the Large Area Picosecond PhotoDetectors (LAPPDs), photosensors of large sensitive area based on MCP technology. The LAPPD under study was the most recent, short stack, 10 mu m pore model, expected to have the best capabilities to withstand magnetic field distortions. The measurements were performed at CERN on the MNP-17 and M113 vertical dipole magnets in magnetic fields up to similar to 1.5 T. The results show the exponential drop of the LAPPD gain as a function of the magnetic field strength, with a rather mild dependence on the angular distribution. The relative photon detection efficiency in magnetic field is also affected. However, both the gain and the efficiency can be partially recovered by increasing the LAPPD bias voltages. Geometrical effects on the anode charge spot and time resolution were also studied.

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Key words

MCP,LAPPD,Magnetic field effect,Photon detection,EIC (Electron-Ion Collider)

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