LAPPD Figures for Papers and Talks



The geometry of the coupling between the coaxial cable
from the pulse generator to the anode strip before modification

Richn three tile anode3


{The 3-tile anode used to measure bandwidth, attenuation,
and impedance as a function of anode strip length. The connections
between anode strips on neighboring tiles have been made by soldering
small strips of copper to the silver silk-screened strips on the

Richn zero tile anode3


A `zero-length tile'
consisting of a pair of fanout cards, used to
characterize the measurement system with no tile.

Richn single tile


A single tile with a 229.1 mm-long 40-strip anode. The anode
strips are connected at both ends to the fanout cards used for

Eric equiv circuit v4


The equivalent electrical HV and signal circuits of the strip-line
anode. The silver strip-lines are fired onto the top surface of
the glass plate that forms the bottom of the tile package. The
sealed tiles (See Figure~\ref{fig:rich_frugal_tile})
sit on a copper sheet, which acts as the ground plane for the
strip-line. Each strip-line is terminated in 50\ohm at each

Richn frugaltile crop


The basic structure of the glass LAPPD MCP-PMT detector. The
sealed vacuum tube consists of a top window with the photocathode on
the inner surface, an accelerating gap for the initial
photo-electron, a pair of 20-cm-square MCPs in a chevron geometry
that amplify the photo-electron by factors up to $5\times
10^7$, a gap after the output of the second MCP, and the anode that
collects the exiting `cloud' of electrons. The package is less than 15 mm thick.

Arisaka beaune v2


Modified Arisaka slide (Henry Frisch)

Space time%20resolution


Difference in capabilities between the glass and ceramic packages. (Jason McPhate)



PSEC-4 sampling rate: measured and post-extraction simulated. (Eric)

Anode return path equiv circuit4


Anode/HV return path schematic. (Eric)