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PS2 Status

This document outlines the key parameters discussed during the PS2 working group PAF meeting, including goals for injection energy, RF requirements, and lattice considerations. Notable highlights include the ultimate LHC goals, injection strategies, and the analysis of different RF scenarios to optimize PS2 performance. The meeting also touched upon injection and extraction methodologies, anticipated machine configurations, and considerations for high-intensity experimental areas. The next steps involve detailed studies on injection, extraction, and lattice design, ensuring compatibility with PS2's operational needs.

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PS2 Status

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  1. PS2 Status M. Benedikt for the PS2 working group PAF meeting

  2. Main parameters • Goal: twice “ultimate” LHC & 20% reserve at PS2 injection. • 1.7E11*2*1.2 = 4.0E11 per LHC bunch (25ns) • Injection energy by incoherent SC considerations and scaling from PS (assuming “similar” bunches): • bg2PS2 = bg2PS x (2 x 1.2) x (lengthPS2 / lengthPS) • Factor 5.15 increase for PS2 = 15/77 SPS 4.15 GeV instead of 1.38 GeV • Estimation of minimum length based on • 50 GeV extraction energy • 1.8 T maximum bending field • Result: minimum length of around 2*PS (see later) PAF meeting

  3. RF considerations • Present PS performance depends critically on RF manipulations. RF requirements as basic input for lattice design: adiabaticity + voltage dependency on gamma_T. • Analysis of different RF scenarios for PS2 • PS2 RF similar to PS (10 MHz (400 kV), 20, 40, 80 MHz systems for LHC) • RF gymnastics at low and high energy • Ideal gamma_T around 6i to 10i. • Compatible with PS as injector and ion operation (not studied in detail) • PS2 RF with SPL as injection (40 MHz, system only, ~1.5 MV) • Injection of any bunch pattern up to 40 MHz with SPL chopping. • No gymnastics at low energy, bunch shortening (adiabatic or non ad.) at high energy • Gamma_T in the range 6 to 10 (real or imaginary) • 40 MHz has (very) limited tuning range non-compatible with ions? • Impact of RF on machine length: RF cogging with SPS  PS2 = 15/77 SPS • For SPS FT filling with 5-turn MTE: only 2/77 SPS unfilled i.e. 0.6 micros. PAF meeting

  4. Lattice considerations (i) • Based on RF requirements and general parameters. • Analysis of different cells for arcs (FODO, Doublet, Triplet and FMC) PAF meeting

  5. Lattice considerations (ii) • FODO lattice with gamma_T = 9 for more detailed investigations • Regular structure with “missing-dipole” D-suppressors • Next steps: • Arc short straight section layout (correctors, pick-ups, multipoles) • CO, Q’ correction studies • Injection / extraction study • Gamma-T jump considerations • Site study with TS on implementation and geometry • FMC structure (with imaginary gamma_T) not yet chosen • Most probably DOFO type similar to JPARC design. PAF meeting

  6. Injection / Extraction • Generic study of injection and extraction in PS2 • Assumption: racetrack machine with long SS parallel to TT10 • Injection from TT10 (or new injection line) • Extraction towards SPS point 1 • Injection requirements • H- at ~ 4 GeV with ~ 100 turns (500 micros) • Fast bunch-to-bucket injection from PS, RCS or LEIR (ions directly) • Extraction requirements • Fast towards SPS for LHC type beams • Five turn continuous (MTE) towards SPS for fixed target physics. • Slow extraction and fast extraction for PS2 physics • Single extraction channel for all extractions • Presently study of transfer line towards SPS (for FODO PS2) and separation for PS2 exp. areas. PAF meeting

  7. Comparison of NC / SF or SC variants • First analysis to be finished by end of April • Identification of SIGNIFICANT differences between NC and SF variants in capital cost of main systems and in operation cost (energy and power consumption). • From machine operation requirements (apertures, working range, cycles) and preliminary 2-dimensional designs of the main magnets, the main parameters of magnet, cryogenic, cooling and power converter systems will be derived as basis for cost estimates. • Magnets, power converter, cryogenics done, CV and TS missing • Not included in present analysis: • Quench limit estimate (protons, ions) and impact on machine design. • Cost for machine protection and quench protection systems • Recovery time after a magnet quench • Cooling-down and warming-up time for SF machine and influence on shutdown/short stops. • Time to open the cryogenic system to install/remove equipment (magnet replacement time) • Safety aspects in accelerator tunnel • Operational flexibility / limitations • Tuning flexibility / limitations PAF meeting

  8. Considerations on experimental areas • Sub-group with support from POFPA, physics coordinator, ATB/EA • High intensity experiments • E.g. Kaon physics, slow-extraction continuous operation • Target development, etc., fast extraction, single pulses • Requires dedicated area with adequate shielding (underground) • Low-Intensity test beams (similar to PS EAST Hall) • Irradiations, etc. • Presently ongoing • Generic layout of multi-usage caverns (halls) for high intensity experiments and also low-intensity area • Study with TS of implementation and cost (under ground, surface, etc.) PAF meeting

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