Difference between revisions of "Pair Spectrometer"
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=== Pair spectrometer overview === | === Pair spectrometer overview === | ||
[[Image:PairFig.jpg |350px]] | [[Image:PairFig.jpg |350px]] | ||
| − | === | + | ==== 18D36 magnet ==== |
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<gallery> | <gallery> | ||
image:30D72_waterPower.JPG|water power connections | image:30D72_waterPower.JPG|water power connections | ||
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Image:30D72_coils1.JPG|coils1 | Image:30D72_coils1.JPG|coils1 | ||
Image:30D72 coils2.JPG|coils2 | Image:30D72 coils2.JPG|coils2 | ||
| + | Image:2012-06-05_07-33-29_980.jpg|Downstream end of the vacuum chamber | ||
| + | Image:2012-06-05_07-33-42_340.jpg|Downstream end of the vacuum chamber | ||
</gallery> | </gallery> | ||
| − | ==== | + | ====GEANT Simulation (old) ==== |
| − | + | Pair Spectrometer's geometry implemented in the GEANT simulation. | |
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| + | [[Image:Pair_layout_tdr.jpg |350px]] | ||
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| + | The top plot corresponds to the elevation and the bottom plot corresponds to the plan views. | ||
| + | |||
| + | ----- | ||
| + | Energy resolution of 24 FSF (top) and 6 WSF (bottom) counters estimated with | ||
| + | the GEANT simulation. The converter thickness corresponds to <math> 5x10^{-3} X_0</math>. | ||
| + | The contribution from the beam spot size (~ 4 mm at the converter) to the energy | ||
| + | resolution dominates for the high-energy bins of the WSF counters. | ||
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| + | [[Image:ps_count_res.jpg |250px]] | ||
| + | |||
| + | ----- | ||
| + | Photon energy spectrum measured by the pair spectrometer. The plot is obtained by | ||
| + | requiring a coincidence between the FSF and WSF counters and contains 24 x 6 = 144 energy | ||
| + | bins. The coincident rate corresponds to a high-luminosity run | ||
| + | ( <math>10^8</math> photons/sec in the coherent peak ) using Aluminum converter with | ||
| + | the thickness of <math>5 x 10^{-3}</math> radiation lengths. | ||
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| + | [[Image:ps_rate.jpg |350px]] | ||
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| + | === TOSCA simulation === | ||
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| + | Pair Spectrometer TOSCA field maps, PS geometry *.opc and and TOSCA result *.op3 files can be found in /u/group/halld/Subsystems/PS/ directory. | ||
| + | |||
| + | Read readme.txt and summary.txt files for more details. | ||
| + | |||
=== Electronics === | === Electronics === | ||
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<br /> | <br /> | ||
---- | ---- | ||
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| + | === Pair Spectrometer Converter === | ||
| + | [https://userweb.jlab.org/~vgr/SUPER%20HARP-November-2011/ Technical drawing of Super Harp ] | ||
| + | |||
| + | === Old Design === | ||
== Links up == | == Links up == | ||
Latest revision as of 11:24, 7 June 2018
Contents
Pair spectrometer overview
18D36 magnet
water power connections
Water Power
ISO view
Pole
Pole
Both halves
top half end
coils1
coils2
Downstream end of the vacuum chamber
Downstream end of the vacuum chamber
GEANT Simulation (old)
Pair Spectrometer's geometry implemented in the GEANT simulation.
The top plot corresponds to the elevation and the bottom plot corresponds to the plan views.
Energy resolution of 24 FSF (top) and 6 WSF (bottom) counters estimated with
the GEANT simulation. The converter thickness corresponds to 
.
The contribution from the beam spot size (~ 4 mm at the converter) to the energy
resolution dominates for the high-energy bins of the WSF counters.
Photon energy spectrum measured by the pair spectrometer. The plot is obtained by
requiring a coincidence between the FSF and WSF counters and contains 24 x 6 = 144 energy
bins. The coincident rate corresponds to a high-luminosity run
( 
photons/sec in the coherent peak ) using Aluminum converter with
the thickness of 
radiation lengths.
TOSCA simulation
Pair Spectrometer TOSCA field maps, PS geometry *.opc and and TOSCA result *.op3 files can be found in /u/group/halld/Subsystems/PS/ directory.
Read readme.txt and summary.txt files for more details.
Electronics
Pair Spectrometer Converter
Technical drawing of Super Harp
