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Comparison Fermilab Main Injector – PS2

Comparison Fermilab Main Injector – PS2. Antoine LACHAIZE - PS2 meeting 18/03/10. Introduction. Similarities can be found between the Fermilab Main injector and the present PS2. A comparison between them may allow us to learn about critical points for that

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Comparison Fermilab Main Injector – PS2

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  1. Comparison Fermilab Main Injector – PS2 Antoine LACHAIZE - PS2 meeting 18/03/10

  2. Introduction Similarities can be found between the Fermilab Main injector and the present PS2. A comparison between them may allow us to learn about critical points for that kind of ring, especially for lattice design and beam operation. Antoine LACHAIZE - PS2 meeting 18/03/10

  3. Lattice – basic parameters Except the length and the energy range, lattice parameters are very similar An imaginary gamma-t lattice has been investigate by D. Trbojevic for the Main Injector Antoine LACHAIZE - PS2 meeting 18/03/10

  4. Lattice – basic parameters FMI synoptics Antoine LACHAIZE - PS2 meeting 18/03/10

  5. Lattice – basic parameters One half of the ring Lattice showing 2 normal FODO cells,4 DS cells and 3 SS half cells Antoine LACHAIZE - PS2 meeting 18/03/10

  6. Lattice – magnets, defaults correction Dipoles Quadrupoles No problem for closed-orbit and chromaticity correction, good dynamic aperture. They made a conscious effort to keep the beam-pipe cross section as smooth as possible and used shielding bellows to reduce impedances Quadrupoles for half integer stop-band correction and octupole families. Antoine LACHAIZE - PS2 meeting 18/03/10

  7. Beam operation 4 basic types of acceleration Antiproton production : 120 GeV top energy, 40 ms flattop 1 Booster batch, 5 x 1012 protons single turn extraction 1.467s cycle FMI fixed target exp : 120 GeV top energy, 1s flattop 6 Booster batches, 3 x 1013 protons resonant extraction 2.867/1.867s cycle Tev injection fixed target : 2 Main Injector cycles per Tevatron cycle 150 GeV top energy, 200 ms flattop 6 Booster batches, 3 x 1013 protons single turn extraction 2.4s cycle Tevatron Coll. injection: 150 GeV top energy, 1.4s flattop single turn extraction 4s cycle Protons : 3 Main Injector cycles to fill Tevatron, 12 Booster batches, 4.6 x 1012 protons Antiprotons : 9 Main Injector cycles to fill Tevatron, 1 Accumulator batch, 1.5 x 1011 antip. Antoine LACHAIZE - PS2 meeting 18/03/10

  8. Beam operation Proton acceleration Coalescing at top energy in the Main Injector: five to seven bunches containing 6x1010 protons will be coalesced into a single bunch of 27x1010 protons in a 1.5 to 2 eV.s emittance. Antoine LACHAIZE - PS2 meeting 18/03/10

  9. Main injector operation - issues The machine was relatively easy to commission and relatively robust to operate. Initial issues with e-cloud, the vacuum system has been “cleaned” up by the beam. The RF is probably the biggest issue, If the momentum spread is a bit to large from the booster, one part of the beam is outside the bucket and is lost during the ramp. Typically 95-98 % acceleration efficiency for 3x1013 injected protons. The collimation system captures 95 % of the beam lost Antoine LACHAIZE - PS2 meeting 18/03/10

  10. Main injector improvements Lattice Larger horizontal apertures in injection/extraction regions. Standard missing dipole dispersion suppressor to avoid multiple types of quads and multiple length of dipoles. Imaginary gamma-t lattice ? RF They go through transition during acceleration and sometimes have a small loss. If they had a choice they’d inject above transition. Augmentation of RF amount Antoine LACHAIZE - PS2 meeting 18/03/10

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