ILC Main Linac Alignment Simulations using Conventional Techniques and the Rapid Tunnel Reference Survey Model (RTRSM)

TL;DR

This paper compares conventional alignment techniques for the ILC main linac with a new rapid simulation model, RTRSM, highlighting its capabilities and limitations in achieving ultra-low emittance.

Contribution

It introduces the RTRSM model for fast generation of reference networks and evaluates its effectiveness and issues in ILC linac alignment simulations.

Findings

RTRSM can rapidly generate statistically accurate reference networks.

Conventional alignment methods are resource-intensive for long accelerators.

RTRSM has some demonstrated limitations in simulation accuracy.

Abstract

Alignment of the ILC main linac will be more critical than for any currently existing accelerators due to its long length and the ultra low emittance required. There are several techniques for measuring the ILC reference network; in this report conventional methods for measuring the network and aligning the main linac are simulated. Dispersion Matched Steering (DMS) is applied to the simulated accelerators to determine their final emittance. Simulations and reconstructions of the ILC reference network usually require very resource intensive programs, the RTRSM has been developed to rapidly generate networks with the required statistical properties. The RTRSM is discussed in this report and some problems are demonstrated.