Difference between revisions of "Alternative readout"
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| − | = | + | = Outline for Bcal using existing technologies = |
* [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=832 Readout of the barrel calorimeter based on conventional photomultiplier tubes] (GlueX-doc-832, Jun 2007) | * [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=832 Readout of the barrel calorimeter based on conventional photomultiplier tubes] (GlueX-doc-832, Jun 2007) | ||
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** Area of the output of the WC (1.2 cm2) reduces the readout by 4cm2/1.2cm2 = 3.3. | ** Area of the output of the WC (1.2 cm2) reduces the readout by 4cm2/1.2cm2 = 3.3. | ||
| + | == Space Constraints== | ||
* The Sketch below is to illustrate the space constraints for any light collection and readout system: | * The Sketch below is to illustrate the space constraints for any light collection and readout system: | ||
[[Image:Bcal_guides.gif]] <br> | [[Image:Bcal_guides.gif]] <br> | ||
| + | |||
| + | = Cathode coverage using fine-mesh pmts = | ||
| + | |||
| + | <pre> | ||
| + | Nominal design | ||
| + | |||
| + | full area Detectors cathode Fraction | ||
| + | inner 111.6 cm2 24 SiPM 1.44cm2 34.6 cm2 0.31 | ||
| + | outer 113.4 cm2 4 XP2262 D=4.4cm 60.8 cm2 0.53 | ||
| + | |||
| + | |||
| + | Fine-mesh pmts Option. | ||
| + | Note: Nine of the smallest 1" pmts bearly fit with housing over the inner | ||
| + | face. Four 1.5" pmts can fit over the outer face. | ||
| + | |||
| + | full area Detectors cathode Fraction | ||
| + | inner 111.6 cm2 9 H6152-70 D=1.75cm 21.6 cm2 0.19 | ||
| + | outer 113.4 cm2 4 H8409-70 D=2.7cm 22.9 cm2 0.20 | ||
| + | |||
| + | </pre> | ||
| + | |||
| + | ==Layout== | ||
| + | [[Image:Bcal guides fm.gif]] <br> | ||
Revision as of 09:06, 11 June 2008
Contents
Outline for Bcal using existing technologies
- Readout of the barrel calorimeter based on conventional photomultiplier tubes (GlueX-doc-832, Jun 2007)
- Issues that need to be considered (rough outline)
- light guides and collection
- fiber light guides? re-evaluation of the granularity for the inner cal
- light detector
- planacons, wire mesh pmts
- magnetic fringe fields / shielding
- cabling / number and sizes of cables / signal degradation
- cable differences between various detectors, e.g. HV
- dark box / "wrapping of detector"
- presently no scheme has been worked out for any scenario
- impact on photon reconstruction [what is our current geometry?]
- what material is included for the WCs/SiPMs/cables?
- cost estimates
- light guides and collection
- Comments:
- Area of fibers cover 50% of the area of the end of the Bcal. Reduction is 2.
- Area of the output of the WC (1.2 cm2) reduces the readout by 4cm2/1.2cm2 = 3.3.
Space Constraints
- The Sketch below is to illustrate the space constraints for any light collection and readout system:
Cathode coverage using fine-mesh pmts
Nominal design
full area Detectors cathode Fraction
inner 111.6 cm2 24 SiPM 1.44cm2 34.6 cm2 0.31
outer 113.4 cm2 4 XP2262 D=4.4cm 60.8 cm2 0.53
Fine-mesh pmts Option.
Note: Nine of the smallest 1" pmts bearly fit with housing over the inner
face. Four 1.5" pmts can fit over the outer face.
full area Detectors cathode Fraction
inner 111.6 cm2 9 H6152-70 D=1.75cm 21.6 cm2 0.19
outer 113.4 cm2 4 H8409-70 D=2.7cm 22.9 cm2 0.20
Layout
