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 positive π/K/p separation up to 10 GeV/c. This requires a timing resolution of 70 ps for single photons. This paper reports on the electronics developed for such measurements, using commercial Micro Channel Plate (MCP) devices and custom ASICs (NINO and HPTDC). The intrinsic timing resolution of the electronics measured with electrical test pulses is 40 ps. With the MCP photon detector and a pulsed laser, a resolution of 90 ps has been recorded in laboratory tests and 130 ps in test beams.
Highlights
The TORCH detector is proposed for the low-momentum particle identification upgrade of the LHCb experiment
The HPTDC’s data are buffered in the on-board FPGA and subsequently transmit to the readout board to be sent to a DAQ PC
The control commands are decoded on the Front-End (FE) boards; according to the command the FPGA will generate control signals for the ASICs, for instance, HPTDC reset, HPTDC measurement start, etc
Summary
The TORCH detector is proposed for the low-momentum particle identification upgrade of the LHCb experiment. 2.1.1 Front-end electronics Figure 3 shows the general data flow in the developed system. The NINO chips amplify the signals from the MCP and measure the Time-Over-Threshold (TOT) according to a user-defined threshold [5]. The HPTDCs measure the arrival time of the rising and trailing edge of the pulse from the corresponding NINO, which provides the TOT information from the MCP.
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