LAPPD Figures for Papers and Talks

Tfitcomparison

94

Best fit of the template shape to an example pulse, plotted
over the full range of the pulse. The lower plot shows the difference between each data point and the fitted curve, with 3 mV error bars corresponding to oscilloscope noise, over the range of interest.

Gfitcomparison

93

An examples of a Gaussian fit to an MCP pulse, plotted above a graph showing the difference between the fitted curve and data points. The error bars correspond to 3mV white noise on the oscilloscope. On this plot, the pulse is fitted over the full range.

Gfitcomparison range

92

An examples of a Gaussian fit to an MCP pulse, plotted above a graph showing the difference between the fitted curve and data points. The error bars correspond to 3mV white noise on the oscilloscope. This plot shows the prescription used in the data analysis of fitting the rising edge only. The solid line and closed circles on the right correspond to the region used in the fit. The dashed line and open points are included to show the fit beyond the range of interest.

Parallelscan

90

Mean differential time between the arrival of the
pulse at the two ends of the microstripline anode, plotted as a function of position along the anode.

Parallelscan anode

89

Illustrating the positions of the parallel anode scan.

Mcpschematicnew

88

The structure of an $\LAPPD$ photomultiplier tube.

Ttsmoney

87

Single-photoelectron time resolution measured in the 8" chamber, binned by noise/signal ($2 \sigma$ error bars). Slight improvements are seen with larger signals, but the single-PE resolutions are limited by fundamental constraints such as pore diameter and asymptotically approach 42 psec for large S/N.

Cuts lin

86

The amplitude distribution of pulses from the 8" chamber (in thick black), showing the separation between the peak of the distribution and the pedestal near zero. The shaded blue region shows the same distribution after applying the TOT cut and requiring only one pulse.

Compare pc 500 200 100

85

Average pulse shape in the 8" chamber for three different photcathode voltages: 500 V (thick line), 200 V (thin line), 100 V (dashed), with 1 kV across each MCP, 500 V across the inter-MCP gap, and 400 V accross the anode.

Compare anode 500 200 100

84

Average pulse shape for 500 V (thick line), 200 V (thin), and 100 V (dashed) across the anode gap, with 400 V across the photocathode and 500 V across the inter-MCP gap.