Difference between revisions of "Monitoring System Requirements"
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| − | |+ '''DRAFT Table of | + | |+ '''DRAFT Table of System Requirements and Comparison''' |
! Characteristic !! LED/fibre !! LED/wire | ! Characteristic !! LED/fibre !! LED/wire | ||
|- | |- | ||
| Dead/alive or on/off || || ≤ 15% | | Dead/alive or on/off || || ≤ 15% | ||
|- | |- | ||
| − | | | + | | Timing check/offset || || typically 100 |
|- | |- | ||
| Requirement on absolute light input || none (PRIMEX might have) || 150 pe on module | | Requirement on absolute light input || none (PRIMEX might have) || 150 pe on module | ||
Revision as of 17:50, 8 December 2010
| Characteristic | LED/fibre | LED/wire |
|---|---|---|
| Dead/alive or on/off | ≤ 15% | |
| Timing check/offset | typically 100 | |
| Requirement on absolute light input | none (PRIMEX might have) | 150 pe on module |
| Variation in arrival times of cal pulses | ~3 ns | ≤ 2 ns |
| Time stability gain and timing (one channel) | ≤ 10% in 6 months | |
| Temperature stability (likely cause of time stability) | 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 |
- 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.
