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== Luminosity Monitor ==
 
== Luminosity Monitor ==
to achieve the precision needed for the luminosity measurement to match the statistical uncertainties anticipated for eRHIC, it is important to follow the concept of the luminosity measurements at HERA as described in [https://wiki.bnl.gov/eic/upload/Zeus-Lumi.Schmidke.pdf here]. The technique involves a electromagnetic calorimeter for photon detector and a pair spectrometer.
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to achieve the precision needed for the luminosity measurement to match the statistical uncertainties anticipated for eRHIC, it is important to follow and improve the concept of luminosity measurements at HERA as described in [https://wiki.bnl.gov/eic/upload/Zeus-Lumi.Schmidke.pdf here]. The technique involves a electromagnetic calorimeter for photon detector and a pair spectrometer. The picture below shows a schematic view of the ZEUS layout a similar layout needs to be realized for eRHIC.
 
{| border="0" cellpadding="5"
 
{| border="0" cellpadding="5"
 
|[[image:Zeus-Lumi.Schmidke 3.png|thumb|500px| ]]
 
|[[image:Zeus-Lumi.Schmidke 3.png|thumb|500px| ]]

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