Changes

=== R&D into Fiber-Array Fabrication Techniques ===

=== R&D into Fiber-Array Fabrication Techniques ===

[[Image:TaggerFocalPlane_ChannelPlan.png|thumb|555px|Scintillating fiber channels as seen by an on-coming electron. Since only energy tagging is required, the members of the 5-channel columns are summed to produce one signal corresponding to that energy channel. The exceptional columns are marked in red - the signals from their individual fibers will be read out to ascertain focal plane orientation and vertical spread.]]

[[Image:TaggerFocalPlane_ChannelPlan.png|thumb|555px|Scintillating fiber channels as seen by an on-coming electron. Since only energy tagging is required, the members of the 5-channel columns are summed to produce one signal corresponding to that energy channel. The exceptional columns are marked in red - the signals from their individual fibers will be read out to ascertain focal plane orientation and vertical spread. Note the segmentation of the 100-energy bin (column) array into 20 fiber modules. This is thought to be a more manageable design, corresponding nicely to the photo-sensor/electronics grouping.]]

The design concept for the Tagger Microscope calls for a scintillating fiber detector array along the focal plane of the spectrally-analyzed beam of electrons. This is a two-dimensional array of broken up into 2 mm² patches (as shown in the adjacent figure) representing the cross-sections of the square scintillating fibers. To avoid placing photo-sensors along the path of the electronics, the scintillation light will be delivered to separately-mounted sensors and electronics via clear fiber waveguides.

The design concept for the Tagger Microscope calls for a scintillating fiber detector array along the focal plane of the spectrally-analyzed beam of electrons. This is a two-dimensional array of broken up into 2 mm² patches (as shown in the adjacent figure) representing the cross-sections of the square scintillating fibers. To avoid placing photo-sensors along the path of the electronics, the scintillation light will be delivered to separately-mounted sensors and electronics via clear fiber waveguides.

A project pertaining to design and prototyping of electronics pertaining to bias, amplification and control of the photo-sensors described above has been conducted by Brendan Krueger, [[User:Senderovich|Igor Senderovich]], and Woody Underwood. Due to the expected variability of performance of these solid-state sensors, the electronics provides for individually selectable bias voltage, controlled amplification over a wide range of light intensities, as well as feedback on key on-board voltages and ambient temperature. Additionally, the summation of signals over scintillator channels vertical in the focal plane is incorporated.

A project pertaining to design and prototyping of electronics pertaining to bias, amplification and control of the photo-sensors described above has been conducted by Brendan Krueger, [[User:Senderovich|Igor Senderovich]], and Woody Underwood. Due to the expected variability of performance of these solid-state sensors, the electronics provides for individually selectable bias voltage, controlled amplification over a wide range of light intensities, as well as feedback on key on-board voltages and ambient temperature. Additionally, the summation of signals over scintillator channels vertical in the focal plane is incorporated.