Difference between revisions of "Monitoring System Requirements"
From GlueXWiki
| Line 3: | Line 3: | ||
! Characteristic !! LED/fibre !! LED/wire | ! Characteristic !! LED/fibre !! LED/wire | ||
|- | |- | ||
| − | | Dead/alive or on/off || || | + | | Dead/alive or on/off || yes || yes |
|- | |- | ||
| − | | Timing check/offset || || | + | | Timing check/offset || yes || yes |
|- | |- | ||
| − | | Relative gain check || | + | | Relative gain check || yes || yes |
|- | |- | ||
| Linearity check || align=center | ~3 ns || align=center | ≤ 2 ns | | Linearity check || align=center | ~3 ns || align=center | ≤ 2 ns | ||
| Line 14: | Line 14: | ||
|- | |- | ||
| Tower row flashing || || 1<sup>o</sup> causes 3% gain change | | Tower row flashing || || 1<sup>o</sup> causes 3% gain change | ||
| + | |- | ||
| + | | Simultaneously flash both ends || || 1<sup>o</sup> causes 3% gain change | ||
|- | |- | ||
| Location of calibration input ||From front to monitor rad damage || light guide tapered side | | 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 | | Geometrical constraints || Approximately 90% of front 4x4 cm2 area available || packing of WC and LGs, LED fitting, cable routing | ||
| + | |- | ||
| + | | Cost || Approximately 90% of front 4x4 cm2 area available || packing of WC and LGs, LED fitting, cable routing | ||
|} | |} | ||
Revision as of 17:54, 8 December 2010
| Characteristic | LED/fibre | LED/wire |
|---|---|---|
| Dead/alive or on/off | yes | yes |
| Timing check/offset | yes | yes |
| Relative gain check | yes | yes |
| Linearity check | ~3 ns | ≤ 2 ns |
| Temperature stability | 1o causes 3% gain change | |
| Tower row flashing | 1o causes 3% gain change | |
| 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 |
| Cost | Approximately 90% of front 4x4 cm2 area available | packing of WC and LGs, LED fitting, cable routing |
- 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.
