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Optimization of FF for 2mrad IR: FD Extraction Version at 1TeV

This document outlines a procedure for designing optics focused on 2mrad extraction with optimized FD for 1TeV, aiming to improve bandwidth and collimation properties. The process involves optimizing the FD, designing line optics, and fine-tuning the FF.

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Optimization of FF for 2mrad IR: FD Extraction Version at 1TeV

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  1. Optimization of FF for 2mrad IR: with FD optimized for 2mrad extractionversion for 1TeV, L*=4.5m A.Seryi August 11, 2005

  2. Procedure for 2mrad optics design: • First, the FD is optimized for 2mrad extraction, using simplified optics of FF • Then, this FD is used to design complete optics of 2mrad extraction • The corresponding extraction line optics is designed by SLAC-BNL-UK-France task force and is posted athttp://www.slac.stanford.edu/~yuri/ILC/Decks/exline-2mr-050809-turtle-nosx.mad • Then, this FD is used to create FF, fully tuned • This file describe this last step

  3. After full FF optimization, the FD parameters are slightly different than what resulted from FD 2mrad extraction optimization. But the difference is very small: KQD0_GOAL/KQD0 = 0.997665494576 KSD0_GOAL/KSD0 = 1.019132654506 KQF1_GOAL/KQF1 = 0.995888130058 KSF1_GOAL/KSF1 = 1.00616327065 • This optics is not fully optimized: • phase advances between collimators and FD are not exact • bandwidth need to be improved, in particular the FD bandwidth (which is important for good collimation properties)

  4. Needed improvements (1) • This optics is not fully optimized: • phase advances between collimators and FD are not exact • betatron collimator is not fully optimized • this leads to some off-plane aberrations (336, 3366) which difficult to correct in FF, and which distort the bandwidth for beam with 1.5% rms energy spread

  5. Needed improvements (2) • This optics is not fully optimized: • bandwidth need to be improved, in particular the FD bandwidth (which is important for good collimation properties) • One of the criteria is behavior of GAMMA vs energy. For good FD bandwidth, GAMMA need to decrease for any energy offset. That would mean that beam envelope for off-energy beam shrinks in FD. Thus, increased energy spread would not require tighter collimation depth. NLC optics this optics

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