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The FAIR Antiproton Target B. Franzke, V. Gostishchev, K. Knie, U. Kopf, P. Sievers, M. Steck Production Target Magnetic Horn (Collector Lens) CR and RESR.

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Presentation on theme: "The FAIR Antiproton Target B. Franzke, V. Gostishchev, K. Knie, U. Kopf, P. Sievers, M. Steck Production Target Magnetic Horn (Collector Lens) CR and RESR."— Presentation transcript:

1 The FAIR Antiproton Target B. Franzke, V. Gostishchev, K. Knie, U. Kopf, P. Sievers, M. Steck Production Target Magnetic Horn (Collector Lens) CR and RESR Radiation Protection

2 Creation of antiprotons (p or pbar) p, > 1 GeV m = E / c² m p = m pbar  1 GeV / c² p p pbar p p, > 6 GeV p at rest m = E / c² p p p pbar_

3 Creation of antiprotons (p or pbar) _ p = 3.82 GeV / c, E = 3 GeV, Bρ = 13 Tm

4 FAIR / CERN / FNAL pbar Sources CERN (AC+AA)FNAL E(p), E(pbar)25 GeV, 2.7 GeV120 GeV, 8 GeV acceptance 200  mm mrad  30  mm mrad protons / pulse1 - 2 × ≥ 5 × pulse length5 bunches in 400 nssingle bunch 1.6 µs cycle time4.8 s1.5 s

5 FAIR / CERN / FNAL pbar Sources cycle time 10 s (cooling time in the CR) overall pbar yield: 5 × pbar/p (based on CERN data) → 1 × 10 7 pbar/s Increases the pbar yield by  50 % FAIR Collector ring will be operated at h = 1, CERN ring was operated at h = 6 Time needed for stochastic cooling in CR (AC), upgrade possible FAIRCERN (AC+AA)FNAL E(p), E(pbar)29 GeV, 3 GeV25 GeV, 2.7 GeV120 GeV, 8 GeV acceptance 240  mm mrad200  mm mrad  30  mm mrad protons / pulse≥ 2 × × ≥ 5 × pulse lengthsingle bunch (50 ns)5 bunches in 400 nssingle bunch 1.6 µs cycle time10 s4.8 s1.5 s

6 pbar Distribution After the Target R.P. Duperray et al., Phys. Rev. D 68, (2003) p pbar = 3.82 GeV/c ± 3% From ~ 2.5 × pbar / (p cm target) ~ 5 × (or 2 %) are "collectable" z / cm y / cm E p = 29 GeV

7 MARS Simulation of the pbar Yields

8 reaction products B  1/r primary beam does not hit the horn Collecting pbars: Magnetic Horn

9 CERN ACOL Horn, I = 400 kA Collecting pbars: Magnetic Horn target beam axis magnetic field area

10 Collecting pbars: Magnetic Horn

11 MARS Simulation of the pbar Yields yield = pbars in the ellipse primary protons

12 MARS Simulation of the pbar Yields

13 Temperature Increase in the Target c Ir = 130 J kg -1 K -1 c Cu = 385 J kg -1 K -1 c Ni = 440 J kg-1 K -1

14 RESR and CR Rings CR circumference: 212 m acceptance: 240 mm mrad bending power: 13 Tm stochastic cooling RESR circumference: 240 m acceptance: 40/30 mm mrad bending power: 13 Tm stochastic cooling

15 CR: Bunch Rotation and Stochastic Pre-Cooling E t bunch rotation adiabatic debunching stochastic cooling  E/E = ± 3 % ± 0.75 % ± 0.5 % ± 0.1 % 50 ns

16 stack corestack tail Cross section throught the vacuum chamber at the momentum pick-up stochastic cooling for stack core RESR: Antiproton Accumulation

17 stack corestack tail 160 mm (  p/p = 0.8 %) stochastic cooling for stack core partial aperture injection kicker injected beam from CR acceleration by HF (not in resonance with stack) Antiproton Accumulation

18 stack corestack tail 160 mm (  p/p = 0.8 %) stochastic cooling for stack core stochastic cooling for beam deposit (high amplification) Antiproton Accumulation

19 stack corestack tail 160 mm (  p/p = 0.8 %) stochastic cooling for stack core Antiproton Accumulation

20 stack core 160 mm (  p/p = 0.8 %) deceleration by HF Antiproton Accumulation

21 stack core 160 mm (  p/p = 0.8 %) extraction kicker Antiproton Accumulation

22 FAIR / CERN / FNAL pbar Sources cycle time 10 s (cooling time in the CR) overall pbar yield: 5 × pbar/p (based on CERN data) → 1 × 10 7 pbar/s Increases the pbar yield by  50 % FAIR Collector ring will be operated at h = 1, CERN ring was operated at h = 6 Time needed for stochastic cooling in CR (AC), upgrade possible FAIRCERN (AC+AA)FNAL E(p), E(pbar)29 GeV, 3 GeV25 GeV, 2.7 GeV120 GeV, 8 GeV acceptance 240  mm mrad200  mm mrad  30  mm mrad protons / pulse≥ 2 × × ≥ 5 × pulse lengthsingle bunch (50 ns)5 bunches in 400 nssingle bunch 1.6 µs cycle time10 s4.8 s1.5 s cycle time 10 s (cooling time in the CR) overall pbar yield: 1 × pbar/p (based on CERN data) → 2 × 10 7 pbar/s

23 Target Station

24 Target Exchange (target on air!)

25 Target Station

26

27 Dose rates around the pbar target 170 m

28 Fluka input, top view airconcreteirongraphitevacuum Super NESR FRS SIS18 CR RESR atomic physics target from SIS 100

29 Equivalent dose rates during operation Equivalent Dose rate [Sv/h], 2 × protons per pulse, 0.1 Hz

30 Induced Activity after Shut-Down airplane at m

31 Induced Activity after Shut-Down vertical section 4 m downstream of target air concrete iron

32 Summary Yield (target / horn / separator): 11 cm Ni-target, copy of CERN horn ~ 2 × pbar per primary proton (4 × 10 7 pbar / s) Yield (out of RESR): ~ 1 × pbar per primary proton (2 × 10 7 pbar / s) No significant increase of this number can be expected with another type of collector like a Li-lens. time averaged, less than 1 kW is deposited in the target higher repetition rate should be no problem Radiation protection: no principal problems up to now


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