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| − | The most important aspects of the optics is the momentum resolution required, how to do the calibration: specifically using some combination of ep elastics, fixed point targets, straight throughs, and angle determination.
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| − | Paul's document on ideas and requirements [http://hallaweb.jlab.org/12GeV/SoLID/download/general/calibrate.ps ps]
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| − |
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| − | ==Optics Calibration==
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| − |
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| − | Optics calibration can be done with some combination of the following
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| − | *ep elastics
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| − | *Fixed point target
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| − | **Carbon foils
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| − | *Straight through
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| − | **Drilling plugable holes through baffles
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| − | **Rotating baffles
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| − | **Using existing slits
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| − | *Angle determination
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| − | **Using straight-through calibration and model field changes to angle
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| − | **Sci-fi tracker just by the target
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| − |
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| − | ==Resolution with GEMs==
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| − | *Xin Qian [http://www.jlab.org/~riordan/About_Resolutions.pdf pdf] [https://hallaweb.jlab.org/dvcslog/SoLID/22 DVCSLog]
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| − |
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| − | ==Elastic Rates==
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| − |
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| − | Elastic rates for LH2, luminosity of <math>1\times10^{37}</math>Hz/cm<math>{}^2</math>, which is about 1 uA.
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| − |
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| − | {|
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| − | |-
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| − | |[[Image:Elastics 044.png|400px]]
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| − | |[[Image:Elastics 044 pvr.png|400px]]
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| − | |-
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| − | |4.4 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]
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| − | |4.4 GeV - Momentum [MeV] vs. r [mm]
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| − | |-
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| − | |[[Image:Elastics 088.png|400px]]
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| − | |[[Image:Elastics 088 pvr.png|400px]]
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| − | |-
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| − | |8.8 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]
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| − | |8.8 GeV - Momentum [MeV] vs. r [mm]
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| − | |-
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| − | |[[Image:Elastics 110.png|400px]]
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| − | |[[Image:Elastics 110 pvr.png|400px]]
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| − | |-
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| − | |11 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]
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| − | |11 GeV - Momentum [MeV] vs. r [mm]
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| − | |}
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| − |
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| − | ===Summary===
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| − |
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| − | To get 200/cm/sector at 50uA
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| − |
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| − | {|
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| − | ! E [GeV]
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| − | ! t [hrs]
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| − | |-
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| − | | 4.4
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| − | | 0.006
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| − | |-
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| − | | 8.8
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| − | | 1.6
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| − | |-
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| − | | 11
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| − | | 6
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| − | |}
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