Booster alignment and aperture Kiyomi Seiya Workshop on
Booster alignment and aperture Kiyomi Seiya Workshop on Booster Performance and Enhancements 23 November 2015
Goal: Move magnets to open up apertures 2 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Outline • Aperture Scan Program • Components in the Booster and Their Aperture • Process of Magnet Realignment • Results of the Magnet Realignment • Status of the Aperture and Orbit • Plan 3 Kiyomi Seiya | Booster alignment and aperture S. Chaurize W. Marsh W. Pellico K. Seiya T. Sullivan K. Triplett A. Waller 11/23/2015
Booster lattice F Magnet • • 4 D Magnet Combined function magnets: F, D FDOODF x 24 periods Corrector packages at short and long Corrector package (12 poles) includes H & V dipoles, quad, skew quad, sextupole, skew sextupole and H & V BPMs. Corrector Package Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Aperture scan with B 75 application 3 bump 5 Kiyomi Seiya | Booster alignment and aperture Changes corrector current at injection 11/23/2015
Aperture scan with B 75 application #2 Int@inj/Int@400 Me. V Intensity BPM_H [mm] BPM position I_H [A] BPM_V [mm] I_V [A] Int@ext/int@400 Me. V H Corrector current V Corrector current 6 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Offline analysis with Java program 7 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Booster lattice and beam size LONG straight SHORT straight bx @short = 33. 7 bx @long = 6. 1 by @short = 5. 3 by @long = 20. 4 8 Kiyomi Seiya | Booster alignment and aperture +/-21. 5 mm +/-9. 15 mm beam size H_emittance(95%) = 14 p mmmrad V_emittance(95%) = 16 p mmmrad @ LONG straight +/-17. 9 mm @ SHORT straight +/-9. 12 mm 11/23/2015
Aperture at Short straight sections 114 m . 3 m F magnet 41. 66 mm 1. 64 inch gap 4. 5 inch beam pipe and corrector 9 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Aperture restriction at S 14 10 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Aperture at Long straight sections 2. 25 inch gap 57. 17 mm D magnet 17 m 57. m 11 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Components at the Long straight section RF beam pipe has smallest diameter. 12 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Magnet Move at L 16 Four magnets were realigned on Aug. 6, 2013 15 -3 upstream: 0 mm 15 -3 downstream: +0. 6 mm 15 -4 upstream: +0. 7 mm 15 -4 downstream: +1. 3 mm 16 -1 upstream: -1. 3 mm 16 -1 downstream: -1. 3 mm 16 -2 upstream: -1. 3 mm 16 -2 downstream: -1. 3 mm +5 mm 0 -5 mm D #1 F #3 #2 F D D F #5 #4 F D D +5 mm F F D D F 1. 3 mm #7 #6 F D D F #9 #8 F D D F #11 #10 F D D F F #12 D D F F D 0 -5 mm D #13 F F #15 #14 F F #17 #16 F F #19 #18 #21 #20 F #23 #22 1. 3 mm 13 Kiyomi Seiya | Booster alignment and aperture 11/23/2015 F #24
Orbit difference before and after Magnet Move (simulation) MAD +/-0. 6 mm Magnet Move program 14 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Aperture at L 16 before and after the Magnet Move Before Move 4 15 Kiyomi Seiya | Booster alignment and aperture After Move 4 11/23/2015
Orbit difference before and after Magnet Move (measurement) Vertical Horizontal +/-0. 8 mm 16 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Vertical magnet position after Magnet Move 17 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Vertical aperture before and after alignments and Magnet Move Long Collimators 18 Kiyomi Seiya | Booster alignment and aperture Short Collimators 11/23/2015
Smoothing orbits November, 2015 April, 2012 ($19 operation cycle) V [mm] 10 0 H [mm] -10 10 0 -10 19 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Orbit compared to the central aperture at injection Orbit has large angle at collimators and absorber. There was more beam loss at the central aperture. 20 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
7 break points on the corrector ramp Corrector current Intensity #1(3 msec) #0(2. 2 msec) #3(10 msec) #2(6 msec) Break points • • 21 #1(3 msec) #4(20 msec) #5(32 msec) #6(35 msec) #0(2. 2 msec) Notch at 2. 17 msec #7(60 msec) Moved 1 st break point from 2 msec to 2. 2 msec. Corrector current is flat during injection. Notch happens before 2 nd break point. Orbit should be at center after 3 msec. Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Summary and Plan Aperture scan was performed with B 75 is operational Magnets were moved at 5 locations. Understood how to move magnets based on simulation results. Vertical aperture was improved. Plan Optimizing orbit at collimators and absorber Smoothing orbits on regular basis Acknowledgements Alignment Group F. Ostiguy 22 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
Aperture scan with 3 bump and 5 bump Corrector + RF D F BPM Scan @ SHORT Scan @ LONG 23 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
24 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
r_F(design)=75. 508566 m+0. 053 inch r_D(design)=75. 434828 m-0. 040 inch need reference position for each component 25 Kiyomi Seiya | Booster alignment and aperture 11/23/2015
- Slides: 25