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README.md

LDM / BSRL Repository

This repository contains hardware designs and software developed for evaluating and integrating various Time-to-Digital Converter (TDC) systems within LDM; Longitudinal Density Monitor or also known BSRL; Beam Synchrotron Radiation Longitudinal Density Monitor which is one of many other Synchrotron Radiation Monitors under SY-BI at CERN.

Repository Structure

🟦 Cronologic_xHPTDC8

  • Type: External TDC (Cronologic xHPTDC8)
  • Language: C++
  • Purpose: Evaluation of the TDC under a short-term loan for comparison and feasibility tests.

🟦 TimeHarp_260

  • Type: Commercial TDC from PicoQuant
  • Usage: Loaned and tested in the accelerator environment, including experiments at ISOLDE.
  • Comparison: Benchmarked against the Acquiris system to support acquisition decisions.

🟦 MultiHarp_150

  • Type: Selected TDC
  • Outcome: Final choice based on performance and integration compatibility.
  • Note: This became the TDC of record after tests with other options.

🟦 Delay_Generator

  • Components: PCB designs, STM32 microcontroller code, and board control software.
  • Purpose: Used for dead-time characterization of both TDC systems and HPMs (Hybrid Photon Multipliers) at BSRL.

🟦 2_4x1_MUX

  • Status: Partially complete
  • Description: A custom-designed multiplexer supporting 1-to-40 signal routing.
  • Purpose: Initially developed to extend a single input port on the TimeHarp 260 for multi-channel acquisition.
  • Files: Contains PCB designs and relevant firmware (if applicable).

Summary

This repository directly supports two core projects:

  1. TDC Selection for the Upgrade: Comprehensive testing of three TDC systems (Cronologic xHPTDC8, TimeHarp 260, and MultiHarp 150), ultimately leading to the selection of the MultiHarp 150 based on performance and integration compatibility. It also includes data analysis from comparative studies between the TimeHarp 260 and the legacy Acquiris system, providing quantitative justification for the upgrade.
  2. Deadtime Characterization: Development of a custom Delay Generator (with PCB design and STM32 firmware) used to evaluate the deadtime of Hybrid Photon Multipliers (HPMs) in conjunction with the selected MultiHarp TDC. It also includes the data analysis of lab test results to extract system timing availability and performance assessment.