WP3/WP4 DR dynamic aperture

Friday 10 Jun 2022, 10:00 → 11:30 Europe/Zurich

Participants: Iryna, Antonio, Paolo, Yongke, Andrea

Here is Fanouria's thesis (OPTICS DESIGN OF INTRABEAM SCATTERING DOMINATED
DAMPING RINGS:
https://cds.cern.ch/record/1666863/files/CERN-THESIS-2012-368.pdf

Yongke's comments on the emittance (So far, the emittances are not yet considered in optimisation):

• The X- and Y- normalized emittances for all particles at 200 MeV:
  • R=20 mm L-band @ 0.5 T: ~10 mm*rad
  • R=30 mm L-band @ 0.3 T: ~20 (23) mm*rad
  • R=20 mm S-band @ 1.5 T: ~75 (78) mm*rad
  • R=30 mm L-band @ 1.5 T: ~126 (120) mm*rad
• But if we look at the particles that are still at 200 MeV but only finally selected in the E&Time window at DR entrance, the emittances will be much smaller:
  • R=20 mm L-band @ 0.5 T: ~7.5 mm*rad
  • R=30 mm L-band @ 0.3 T: ~9.5 mm*rad
  • R=20 mm S-band @ 1.5 T: ~12.5 mm*rad
  • R=30 mm L-band @ 1.5 T: ~15.5 mm*rad

Notes from the meeting:

• The DR design made by Salim was a preliminary design and no optimisation of positron acceptance was done. This point should be reviewed. Most like the dynamic aperture can be better optimized.
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