Incoherent and coherent beamstrahlung at the ILC Page: 4 of 10
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0 0.5 1 1.5 2 2.5 3 d s / a
Figure 1: y-polarization (dotted), x-polarization (dashed), and total large angle beamstrahlung
yield as a function of the beam-beam offset.
design presented in the appropriate forum (such as a ILC workshop). There appears to be no
particular need to buy and test the IB hardware at this time. It is fairly expensive, and CCD
technology is advancing fast enough that a device bought now may well be obsolete once the
ILC becomes a reality.
Having accumulated experience with the CESR device, we have come to grasp some of the
advantages that this device provides. First, some of the lower quality data at CESR show
rate fluctuations in the background. Our devices see only a small window in azimuth, and any
small change in the beam direction will be reflected in a change in the observed rate. This
effect will be minimized if the whole azimuth is observed the whole time. If one part of the
ring is overwhelmed by backgrounds, one can always use the part opposite to it in azimuth.
Ref.  shows that one only needs to monitor 7r/8 radians to recover full information. The
two polarizations also distribute in azimuth according to (sin2 20, cos2 20) distributions. If all
four azimuthal modulations are observed, disentangling signal and background will be much
easier. Ref.  also discusses how this device becomes fully powerful when each polarization
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Bonvicini, G.; Cinabro, D. & Dubrovin, M. Incoherent and coherent beamstrahlung at the ILC, report, April 14, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc876980/m1/4/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.