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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.

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

Elastic Rates

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

Elastics 044.png Elastics 044 pvr.png
4.4 GeV Rate - Rate [Hz/uA/mm] vs. r [mm] 4.4 GeV - Momentum [MeV] vs. r [mm]
Elastics 088.png Elastics 088 pvr.png
8.8 GeV Rate - Rate [Hz/uA/mm] vs. r [mm] 8.8 GeV - Momentum [MeV] vs. r [mm]
Elastics 110.png Elastics 110 pvr.png
11 GeV Rate - Rate [Hz/uA/mm] vs. r [mm] 11 GeV - Momentum [MeV] vs. r [mm]


To get 200/cm/sector at 50uA

E [GeV] t [hrs]
4.4 0.006
8.8 1.6
11 6