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HPPS long ring options

This document outlines the latest developments in the design and parameters of the HPPS long ring options for high-energy particle accelerators. It details various configurations involving NMC cells, magnet parameters, emittance, space charge effects, and working points, emphasizing changes in the filling factor, straight sections, and quadrupole tips. Furthermore, it explores the ring's optics adjustments, highlighting the implications for collimation systems and tuning studies. The parameters are optimized for operations at 50 GeV, ensuring enhanced performance and tunability.

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HPPS long ring options

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  1. HPPS long ring options

  2. HPPS long V1 QH1 QH3 QH4 QH2 • NMC cell without the middle dipole and QH3 splitted • μx=0.8 (still for a resonant arc with 5 NMC cells) • Reduced filling factor • Long straight section: μx=0.44, μy=0.56  slightly larger than previous version (is this enough for the collimation system?)

  3. Circ.: 1256.3 γt=-14.7 Max quad pole tip: 1.7 T @ 50 GeV @ QH3 Dipole gapy=119 mm Ring params

  4. Working point • (Qx,Qy)=(13.32,7.27) • No crossing of the integer (better than in the case of the previous WP) • FM of the previous lattice showed that the (2, -2) not a limitation  needs to be confirmed • Difficult to tune in larger Qx without changing the arc μx • In any case in a more uniform distribution the nectai less wide • SC tune shift up to 4.5 σx,y • DA, FM and tunability studies needed

  5. Space charge • εx=11.9 μm-rad • εy=14.78 μm-rad

  6. Magnet parameters @ 50 GeV V1.1 Dipoles: gap_x=158.6 mm gap_y=118.7 mm

  7. HPPS long V2 • NMC cell without the middle dipole • μx=0.8 (still for a resonant arc with 5 NMC cells) • Reduced filling factor • Long straight section: μx=0.47, μy=0.5  is this enough for the collimation system?

  8. Circ.: 1256.3 γt=-13.2 Max quad pole tip: 1.16 T @ 50 GeV @ QH4 Dipole gapy=114 mm Large betas Ring optics and WP v2.1

  9. Circ.: 1256.3 γt=-13.7 Max quad pole tip: 1.16 T @ 50 GeV @ QH4 Dipole gapy=123.7 mm Larger betas Ring optics and WP v2.2

  10. Working point • V2.1 • (Qx,Qy)=(13.41,9.6) • SC tune shift up to 4.5 σx,y • DA, FM and tunability studies needed • V2.2 • (Qx,Qy)=(13.23,9.23) • SC tune shift up to 4.5 σx,y

  11. Space charge • εx=13.4 μm-rad • εy=13.45 μm-rad

  12. Magnet parameters v21 Dipoles: gap_x=128.1 mm gap_y=105.1 mm v22 Dipoles: gap_x=115.58 gap_y=114.45 mm

  13. Circ.: 1256.3 γt=-26.1 Max quad pole tip: 1.19 T @ 50 GeV @ QH3 Dipole gapx=128 mm Dipole gapy=105 mm Ring optics v2.3

  14. Ring optics v2.3

  15. Working point V23 • V2.3 • (Qx,Qy)=(13.875,12.31) • SC tune shift up to 4.5 σx,y

  16. Space charge & emittance V23 • εx=13.4 μm-rad • εy=13.45 μm-rad

  17. Magnet parameters 50 GeV Dipoles: gap_x=127.9 mm gap_y=104.9 mm 75 GeV Dipoles: gap_x=118.7 mm gap_y=88.3 mm

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