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 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 pdf DVCSLog

Elastic Rates

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


4.4 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]	4.4 GeV - Momentum [MeV] vs. r [mm]

8.8 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]	8.8 GeV - Momentum [MeV] vs. r [mm]

11 GeV Rate - Rate [Hz/uA/mm] vs. r [mm]	11 GeV - Momentum [MeV] vs. r [mm]