Difference between revisions of "Monitoring System Requirements"
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|+ '''DRAFT Table of Parameters and Requirements''' | |+ '''DRAFT Table of Parameters and Requirements''' | ||
| − | ! Characteristic !! LED/fibre !! LED/wire | + | ! Characteristic !! LED/fibre !! LED/wire |
|- | |- | ||
| − | | Dead/alive or on/off || || ≤ 15% | | + | | Dead/alive or on/off || || ≤ 15% || |
|- | |- | ||
| − | | Dynamic range of input (number of photoelectrons) || || typically 100 || | + | | Dynamic range of input (number of photoelectrons) || || 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 17:48, 8 December 2010
| Characteristic | LED/fibre | LED/wire | ||
|---|---|---|---|---|
| Dead/alive or on/off | ≤ 15% | |||
| Dynamic range of input (number of photoelectrons) | 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 | ~3ns | ~3ns |
| 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.
