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PMT Scanning Setup in Building 403: Methodology and Results

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In Building 403, Jerry and I restarted the PMT scanning setup utilizing a pico-second laser in single photon mode at 430 nm. The setup includes a motion-controlled x/y stage with a typical scan step size of 100 mm and repeatability of less than 0.7 mm. We employed a single-threshold LeCroy discriminator TDC (LeCroy 3377) for readout. After calibrating by scanning lines in x, we processed substantial data volumes, saving them as compact files. Our results show consistency with previous scans, validating the MCP setup, despite slightly lower high voltages this year.

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PMT Scanning Setup in Building 403: Methodology and Results

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  1. Scanning Setup Jerry and I restarted the PMT scanning setup in building 403 Light source: Pilas pico-second laser in single photon mode; l=430nm; pulse jitter FWHM < 35ps/60ps Motion-controlled x/y stage: typical scan step size 100mm repeatability < 7mm Readout: single-threshold LeCroy discriminator TDC: LeCroy 3377 (500ps per count) (One dead channel in one TDC) Protocol: scan lines in x before and after each line calibrate by going to DIRC or Photonis PMT Analysis: huge data volume (20k trigger per point, typically 12-15k points) save as compact file, convert to ROOT

  2. Scanning Setup consistent result Scanned MCP #16 (has been in setup for more than one year) Two scans, one with 0.2mm*1.0mm steps, one with 0.5mm*0.5mm steps 0.5ns/count TDC used only to reject background (no timing scan) → obtain results consistent with 2004 scans. (MCP at slightly lower HV than last year, Photonis calibration PMT at lower HV) 2.6 old result:

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