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group_5 [2018/09/10 15:05] flowerdew |
group_5 [2018/09/13 16:13] flowerdew |
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===Monday 10th September=== | ===Monday 10th September=== | ||
- | * Group chose a < | + | Question 3: |
- | * Example_1.fox was edited to include a dipole which bends the trajectory 45°.\\ | + | |
- | * <PD> (corresponding to ΔE/E) in coordinate SB was changed to 0.01 to create a small momentum spread: | + | * Example_1.fox was edited to include a dipole which bends the trajectory 45°.\\ |
+ | * <PD> (corresponding to ΔE/E) in coordinate SB was changed to 0.01 to create a small momentum spread: | ||
{{screen_shot_2018-09-10_at_14.40.48.png|Trajectory of ray with small momentum difference }} | {{screen_shot_2018-09-10_at_14.40.48.png|Trajectory of ray with small momentum difference }} | ||
- | * PTY was changed to 3 to allow us to see the curvature: \\ | + | |
{{group5_screen_shot_2018-09-10_at_15.03.08.png }} | {{group5_screen_shot_2018-09-10_at_15.03.08.png }} | ||
+ | |||
+ | Question 4: | ||
+ | |||
+ | * Used website to calculate θ< | ||
+ | ** Opening angle = 10 mrad which is less than the θ< | ||
+ | ** ΔE/E = ~2% which is less than the 3.1% threshold so this also works.\\ | ||
+ | |||
+ | Question 5: | ||
+ | |||
+ | * < | ||
+ | |||
+ | Question 6: | ||
+ | |||
+ | * Using 'WRITE 6 VMAX(RAY(1))' | ||
+ | * Plotting COSY beam size (x) and the quadrupole field strength(divided by aperture radius) and arrived at the graph below. Data doesn' | ||
+ | * Calculated emittance is around 50% larger than the ' | ||
+ | |||
+ | {{:: | ||
+ | |||
+ | Question 7: | ||
+ | |||
+ | * Effective field length of Q2 was increased by 3% and the drift lengths either side were adjusted accordingly, | ||
+ | * The mass resolution was then optimised by minimising the function OBJ := 1/ | ||
+ | * This would increase the mass resolution to values of up to 85,000, however the emittance was very large. | ||
+ | |||
+ | {{Group5_screen_shot_2018-09-13_at_16.02.21.png }} | ||
+ | |||
+ | * We realised that we should alter our objective function, in order to re focus our beam. This was achieved with the function OBJ := 1/ | ||
+ | |||
+ | {{Group5_screen_shot_2018-09-13_at_15.48.23.png }} | ||
+ | |||
+ | * This optimisation improved the mass resolution from 640.86349 to 724.5905, while still focusing. | ||
+ |