Difference between revisions of "Monitoring System Requirements"

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== Calibration Specifications Table ==
 
 
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|+ DRAFT Table of Calibration Specifications: Blanks need to be completed by subsystem.
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|+ '''DRAFT Table of System Requirements and Comparison'''
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! Characteristic !! Fcal !! Bcal !! TOF !! Start
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! Characteristic !! LED/fibre !! LED/wire
 
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| Light uniformity channel-to-channel || || ≤ 15% || ||
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| Dead/alive or on/off || yes || yes
 
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| Dynamic range of input (number of photoelectrons) || || typically 100 || || 100 up to 800
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| Timing check/offset || yes || yes
 
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| Requirement on absolute light input || none (PRIMEX might have) || 150 pe on module || ||
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| Relative gain check || yes || yes
 
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| Variation in arrival times of cal pulses || align=center | ~3 ns || align=center | ≤ 2 ns || align=center | ~3ns || align=center  | ~3ns
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| Linearity check || low end (a few times one LED) only || low end (a few times one LED) only
 
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| Time stability gain and timing (one channel) || || ≤ 10% in 6 months || ||
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| Temperature stability || yes, temp sensors in box|| <font color=orange> temp sensors in areal spread?</font>
 
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| Temperature stability (likely cause of time stability) || || 1<sup>o</sup> causes 3% gain change|| ||
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| Tower row flashing || yes, multiplexer || yes, multiplexer
 
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| Location of calibration input ||From front to monitor rad damage || light guide tapered side || ||  
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| Simultaneously flash both ends || <font color=orange>no solution yet</font> || <font color=orange>no solution yet</font>
 
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| Geometrical constraints || Approximately 90% of front 4x4 cm2 area available || packing of WC and LGs, LED fitting, cable routing || ||  
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| Location of LEDs input || Boxes at outer edge of each module, fibres || LED+board on light guide, LPCM in rack
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| Geometrical constraints || <font color=red> mechanical/fragility/replacement are serious concerns</font> || <font color=green>none; easy to install</font>
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| R&D done || Some, solution not preferred || <font color=green> Extensive, mature solution exists</font>
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| Cost || Not costed || <font color=green> quotation exists (getting stale)</font>
 
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# Comment: Time (and temperature) stability most important.
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# Details: [http://www.jlab.org/Hall-D/software/wiki/index.php/Dec_06%2C_2010_Calibration/Monitoring Minutes/notes from December 6, 2010]
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# Comment: Option of delivering a range of light intensities important (e.g. using various filter settings).
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# Pertinent information and calculations: [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1645 GlueX-doc-1645].
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# 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.
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# Comment: time and temperature stability of system is very important.
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# 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?
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# Comment: Option of delivering a range of light intensities important (e.g. using various filter settings). Athens will test stability of LEDs at low output (near threshold) to see if this can be used as an additional check point in our monitoring. Double LED system (one UV and one blue) per light guide will be investigated.
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# Comment: Matt drew attention to an  [http://physics.indiana.edu/~ptsmith/pulseled/ LED pulser by Paul Smith] which might be a useful reference.
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# Comment: LED system could be very useful for the Start Counter.

Latest revision as of 17:12, 24 February 2017

DRAFT Table of System Requirements and Comparison
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, temp sensors in box temp sensors in areal spread?
Tower row flashing yes, multiplexer yes, multiplexer
Simultaneously flash both ends no solution yet no solution yet
Location of LEDs input Boxes at outer edge of each module, fibres LED+board on light guide, LPCM in rack
Geometrical constraints mechanical/fragility/replacement are serious concerns none; easy to install
R&D done Some, solution not preferred Extensive, mature solution exists
Cost Not costed quotation exists (getting stale)
  1. Details: Minutes/notes from December 6, 2010
  2. Pertinent information and calculations: GlueX-doc-1645.
  3. Comment: time and temperature stability of system is very important.
  4. Comment: Option of delivering a range of light intensities important (e.g. using various filter settings). Athens will test stability of LEDs at low output (near threshold) to see if this can be used as an additional check point in our monitoring. Double LED system (one UV and one blue) per light guide will be investigated.
  5. Comment: LED system could be very useful for the Start Counter.
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