Abstract
The TORCH detector is proposed for the low-momentum particle identification upgrade of the LHCb experiment. It combines Time-Of-Flight and Cherenkov techniques to achieve charged particle separation up to 10 GeV/c. This requires a time resolution of 70 ps for single photons. Existing electronics has already demonstrated a 26 ps intrinsic time resolution; however the channel count and density need improvements for future micro-channel plate devices. This paper will report on a scalable design using custom ASICs (NINO-32 and HPTDC). The system provides up to 8 × 64 channels for a single micro-channel plate device. It is also designed to read out micro-channel plate tubes with charge-sharing technique.
Highlights
The 32-channel NINO chips amplify the signals from the MCP and measure the Time-Over-Threshold (TOT) according to a user-defined threshold [8]
The system is a modular and scalable design, up to 8 NINO/HPTDC boards can be used for a single MCP within the 60 × 60 mm2 envelope
3.2 Analogue front end – NINO board As shown in figure 5, a NINO board is equipped with two 32-channel IRPICS2 (NINO) ASICs [8], which are wire-bonded to the PCB
Summary
The 32-channel NINO chips amplify the signals from the MCP and measure the Time-Over-Threshold (TOT) according to a user-defined threshold [8]. The NINO chips perform TOT measurements according to a threshold value that can be set by an on-board DAC. The pulse is split in two channels on the NINO board, one with added cable delay as shown in figure 6. The distribution of the time difference measured between the output of these two channels is shown in figure 6. It can be seen from the histogram the sig√ma of the Gaussian fit is 38 ps.
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