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A study on tagger acceptance is given [https://wiki.bnl.gov/eic/upload/JA-Tagger_acceptance_20201027.pdf here].
 
A study on tagger acceptance is given [https://wiki.bnl.gov/eic/upload/JA-Tagger_acceptance_20201027.pdf here].
   
<br />The main detector covers -4 to 4 in rapidity for the scattered lepton. So scattered leptons with a scattering angle > 178 degree will not be detected in the main detector.The plots below correlate the momentum of the scattered lepton with its scattering angle and its Q<sup>2</sup>.To see some of these low Q<sup>2</sup> leptons it is important to separate the scattered lepton from the outgoing lepton beam.  
 
<br />The main detector covers -4 to 4 in rapidity for the scattered lepton. So scattered leptons with a scattering angle > 178 degree will not be detected in the main detector.The plots below correlate the momentum of the scattered lepton with its scattering angle and its Q<sup>2</sup>.To see some of these low Q<sup>2</sup> leptons it is important to separate the scattered lepton from the outgoing lepton beam.  
 
To have a reasonable low Q<sup>2</sup> acceptance the requirement for the IR is to transport<br />'''leptons with 10% momentum of the full beam energy (E<sub>e'</sub> >= 0.9 E) and with a scattering angle from 179.5 to 178 degree (180 degree being the outgoing beam) through the magnets.'''<br />The resulting Q<sup>2</sup> distribution after applying all the requirements listed above is shown in the 4th row below.
 
To have a reasonable low Q<sup>2</sup> acceptance the requirement for the IR is to transport<br />'''leptons with 10% momentum of the full beam energy (E<sub>e'</sub> >= 0.9 E) and with a scattering angle from 179.5 to 178 degree (180 degree being the outgoing beam) through the magnets.'''<br />The resulting Q<sup>2</sup> distribution after applying all the requirements listed above is shown in the 4th row below.
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