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Measurement of tex2html_wrap_inline747

Figure 6:   Radial distribution of scattered particles at z=+1m. The solid circles are those of the nominal beam condition; the dotted, dashed and solid lines are those of tex2html_wrap_inline745=2tex2html_wrap_inline1015, tex2html_wrap_inline745=10tex2html_wrap_inline1015 and tex2html_wrap_inline747=2tex2html_wrap_inline1023, respectively, where the other beam parameters are the same as those of the nominal beam. The distributions are normalized by the total number of particles of E>100MeV.

The maximum radius (tex2html_wrap_inline1027) seen in Fig.5(a) corresponds to the maximum deflection angle, since most of the particles obtain transverse momenta mainly due to deflection. Therefore, from a measurement of tex2html_wrap_inline1027 we can obtain information concerning tex2html_wrap_inline747 (see Eq.14). A simulation has confirmed that tex2html_wrap_inline1027 depends mainly on tex2html_wrap_inline747, at least for tex2html_wrap_inline103710 tex2html_wrap_inline1015, as shown in Fig.6, where tex2html_wrap_inline1027 can be defined as the shoulder; tex2html_wrap_inline1027=7.1 and 6.1cm for the nominal and the case of twice wider tex2html_wrap_inline747, respectively. Small tails due to scattering with large inherent angles are also observed beyond the shoulders. The ratio tex2html_wrap_inline1047 is found to be 0.86, which should be compared with 0.88 estimated by Eq.14. In order to estimate tex2html_wrap_inline747 from the observed tex2html_wrap_inline1027 we have to know the beam intensity (N); it can be accurately measured by using monitors in the accelerators. We therefore expect a very good on-line measurement of tex2html_wrap_inline747.

Toshiaki Tauchi
Sat Dec 21 00:34:16 JST 1996