# Changes

,  09:47, 27 March 2017
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The BH photon cone size will be smeared by the angular divergence of the beams at the IP and its magnitude will depend on the design of the beam optics.  This has also been studied.  Though the parameters on the machine are still being optimized, a study was carried out using the parameters found in , assuming an (normalized) emittance, &epsilon; = 23x10<sup>-6</sup> m (58x10<sup>-6</sup> m) for e+p (e+Au) and a &beta;<sup>*</sup> = 5 cm.  The dependence of the angular beam divergence on the e beam energy assuming the above parameters is shown in the figure below.
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The BH photon cone size will be smeared by the angular divergence of the beams at the IP and its magnitude will depend on the design of the beam optics.  This has also been studied.  Though the parameters on the machine are still being optimized, a study was carried out using the parameters found in , assuming an (normalized) emittance, &epsilon; = 23x10<sup>-6</sup> m (58x10<sup>-6</sup> m) for e+p (e+Au) and a &beta;<sup>*</sup> = 5 cm.  The dependence of the angular beam divergence on the e beam energy assuming the above parameters is shown in the figure below.  The angular smearing from the divergence is roughly a factor of 10 or higher than the natural size of the cone from the process.  This means that the requirements for the space required for the passage of the photon cone through the IR to the detector system is determined almost entirely by the beam optics and the resulting angular divergence.