LAPPD Figures for Papers and Talks

 53Populated analog card with tile. 52The initial PSEC4 application: a high-channel density waveform digitization of a large-area MCP RF microstrip anode. 51 The geometry of the test setup: A signal is input on the near end of the central strip (shown in red) and is detected at the far end. The power is measured on the near and far ends of the neighboring strips.} 50Comparison of total normalized power summed over all strip-lines for three different anode geometries: a single 30-strip tile (triangles), a single 40-strip tile (circles), and three 30-strip tiles in series. 49{The mechanism of cross-talk for a positive signal with a linear rising edge~\cite{Bogatin}. Two adjacent strip-lines are shown; the common ground plane is not shown for clarity. The active line is driven on the near end with a signal pulse of rise-time $t_r$. At the far end of the active line the same pulse is seen a time $t_d$ later, determined by the length and characteristic velocity of the line. The neighboring line, the quiet line, is coupled to the active line capacitively and inductively by the electric and magnetic fields, respectively. At the near end of the quiet line a positive voltage appears at the start of the signal and persists for 2$t_d$. For an inductive coupling, at the far end a negative voltage appears starting at $t_d$ with a width~$t_r$. 48The bandwidth measured at 3db loss on the central strip versus the log of the total anode length. The anodes consisted of 3 and 4 tiles in series (746.7 mm and 916 mm, respectively, including the length of the fanout card strips), a single tile (288.5 mm), and only the 2 fanout PC cards connected to each other (zero tiles'- 59.4 mm). 47The normalized power (output power/input power) versus log-frequency for a single 229.1 mm-tile plus fanout cards(288.5 mm) with 30 strips (red, middle trace), 40 strips (blue, bottom trace), and the fanout PC cards alone(zero-tile', in green, top trace). See Figure~\ref{fig:single_tile}. The (black) horizontal line represents the 3db loss level (50\% loss in power). 46The measured real (top) and imaginary (bottom) impedance versus frequency for 40-strip and 30-strip silk-screened anodes on a single 229.1 mm-long glass tile base between two fanout cards. The targeted design impedance (top) was 50\ohm. 45The anode responses in the time domain to a step-function introduced into one end of a strip in a multi-strip anode. The source of the reference pulse is the calibration output from a Tektronix TDS6154C oscilloscope, which has a risetime of 200 psec and an amplitude of 440 mV (peak-peak). The response curves in the figure were measured with the same oscilloscope. 44The geometry of the coupling between the coaxial cable from the pulse generator to the anode strip after impedance matching with copper tape