View source for Solid Optics

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.

Paul's document on ideas and requirements [http://hallaweb.jlab.org/12GeV/SoLID/download/general/calibrate.ps ps]

==Optics Calibration==

Optics calibration can be done with some combination of the following
*ep elastics
*Fixed point target
**Carbon foils
*Straight through
**Drilling plugable holes through baffles
**Rotating baffles
**Using existing slits
*Angle determination
**Using straight-through calibration and model field changes to angle
**Sci-fi tracker just by the target

==Resolution with GEMs==
*Xin Qian [http://www.jlab.org/~riordan/About_Resolutions.pdf pdf] [https://hallaweb.jlab.org/dvcslog/SoLID/22 DVCSLog]

==Elastic Rates==

Elastic rates for LH2, luminosity of <math>1\times10^{37}</math>Hz/cm<math>{}^2</math>, which is about 1 uA.

{|
|-
|[[Image:Elastics 044.png|400px]]
|[[Image:Elastics 044 pvr.png|400px]]
|-
|4.4 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]
|4.4 GeV - Momentum [MeV] vs. r [mm]
|-
|[[Image:Elastics 088.png|400px]]
|[[Image:Elastics 088 pvr.png|400px]]
|-
|8.8 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]
|8.8 GeV - Momentum [MeV] vs. r [mm]
|-
|[[Image:Elastics 110.png|400px]]
|[[Image:Elastics 110 pvr.png|400px]]
|-
|11 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]
|11 GeV - Momentum [MeV] vs. r [mm]
|}

===Summary===

To get 200/cm/sector at 50uA

{|
! E [GeV]
! t [hrs]
|-
| 4.4
| 0.006
|-
| 8.8
| 1.6
|-
| 11
| 6
|}