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Recent works

Recent works. Tolerance budget study on two stage compression A code has been developed for automatically find the working point of the two stage compression base on litrack

charity-stanton
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Recent works

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  1. Recent works • Tolerance budget study on two stage compression • A code has been developed for automatically find the working point of the two stage compression base on litrack • Multi-objective genetic algorithm (moga) code is used to get the smallest jitter of the energy, peak current and the arriving time

  2. The jitters of the linac parameters The variables and goals Variables R56 of 1st compressor: -0.04~-0.06m R56 of 2nd compressor: -0.01~-0.03m Compression ratio of the first compressor: 8~20 Goals (jitter) Energy: 0.02% Peak current: 10% Arriving time: 20fs tols.err = [ 0.05 % inj_arrps 2 % inj_dQ % 0.05 % L1_pha deg 0.02 % L1_volt % 0.05 % Lx_pha deg 0.02 % Lx_volt % 0.05 % L2_pha deg 0.02 % L2_volt % 0.05 % L3_pha deg 0.02 % L3_volt % 0.001 % BC1_dR56 0.001 % BC2_dR56 ];

  3. 1st generation of the moga: variables

  4. 1st generation of the moga: goals Jitters have same effect on the arriving time and peak current In the energy case, it is seems different.

  5. 28th generation of the moga: variables 1st R56 is towards -0.06m, while 2nd R56 is around -0.01~-0.014m 1st stage compressing ratio is around 13~15 2nd R56 is correlated with 1st stage compressing ratio

  6. 28th generation of the moga: goals Bad case

  7. With the giving jitter of the linac parameters, it seems that the optimized 1st R56 moves toward -0.06m, the 2nd R56 is around -0.01~-0.014m, and the compression ratio is around 13~16. • The 1st s-band linac section has the tightest requirements on phase jitter, and similar in the case of phase of the x-band linearizer.

  8. 1D tracking of good sample Injector exit Linac exit

  9. Summary and plans • We have established an effective procedure of jitter optimization with every factor in 1D tracking. • The first result showed the tight jitter budget of the x-band linac even with optimization. • Wake from the real x-band structure should be used instead of the default x-band wake in litrack. The voltage and the length of the structure should be checked. • More work should be done on the jitter budget assignment among the 3 linac sections. • Large R56 of the 1st stage should be carefully studied with the lattice design and 6D tracking.

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