Monitoring System Requirements
From GlueXWiki
| Characteristic | LED/fibre | LED/wire |
|---|---|---|
| Dead/alive or on/off | yes | yes |
| Timing check/offset | yes | yes |
| Relative gain check | yes | yes |
| Linearity check | low end (a few times one LED) only | low end (a few times one LED) only |
| Temperature stability | yes, sensors in box | sensors in areal spread? |
| Tower row flashing | yes, multiplexer | yes, multiplexer |
| Simultaneously flash both ends | 1o causes 3% gain change | |
| Location of calibration input | From front to monitor rad damage | light guide tapered side |
| Geometrical constraints | Approximately 90% of front 4x4 cm2 area available | packing of WC and LGs, LED fitting, cable routing |
| R&D done | Some, solution not preferred | Extensive, mature solution exists |
| Cost | Not costed | quotation exists (getting stale) |
- Comment: Time (and temperature) stability most important.
- Comment: Option of delivering a range of light intensities important (e.g. using various filter settings).
- Comment from Werner: The flexibility in the use of the LED would be very useful for the start counter. Christina: Still need to test stability.
- Questions to Matt: What uniformity could one expect from the plexiglass input system? How many fibers were used to pulse the plexiglass, i.e. how often were they spaced?
- Comment: Matt drew attention to an LED pulser by Paul Smith which might be a useful reference.
