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The Final Three Meters in the ILC - Can the Beam Approach 5 nm?

This paper gives a quantitative analysis of the space charge force in the final three meters in the ILC before the beam reaches the interaction point (IP). The relativistic cancellation between the self electric and magnetic field is not perfect due to finite beam emittance. The residual force remains larger than the external focusing force and could be a problem for the beam to approach the design vertical size (5 nm).