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Expected counting rates

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FRS experimental setup Total load is limited by SC1 and MUSIC1

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Count rate limitations At S1 ~10 5 s -1 (SC1) At S2 ~10 4 s -1 (MUSIC1 - Munich) TPC ?

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Modified LIESCHEN code Cross-sections for nuclide production in the target are read from ABRABLA output (Wojtek Gawlikowicz)

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Normal setup Proposal values : – 238 U beam 950 A MeV –Pb target 1500 mg/cm² –No degrader at S1 LIESCHEN results: –Width of the x distribution at S2: 24 cm –Total counting rate at S1 and S2 is ~5×10 -3 per beam particle –Counting rate for 132 Sn is 7×10 -5 per beam particle Primary beam I max = 2×10 6 s -1 (limited by the MUSIC1) 132 Sn counting rate 140 s -1

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SC-11 SC-41 SC-21 Position MUSIC-1 (Munich) Fragmentation target (Be) MUSIC-2 MW-1MW-2 Fission target Degrader Modified setup Slits Can we reduce the total counting rate without affecting the yields of 132 Sn and get possibility to increase intensity of primary beam?

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Modified setup - optimization Degrader thickness so that the ratio of total counting rates at S1 and S2 becomes ~10: –10000 mg/cm² ≈ 55% of range – 132 Sn attenuation ~50% –Secondary production of 132 Sn ? Slits (-3,3)cm Target thickness: 800 mg/cm 2 –Width of the x distribution at S2: 20 cm MAXIMUM LOAD AT BOTH S1 AND S2 Primary beam I max = 2×10 7 s -1 132 Sn counting rate ≥ 350 s -1 Factor of 2.5 more than in the normal setup

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Comparison Normal setupModified setup Target thickness [mg/cm²]1500800 Degrader [mg/cm²]no10000 Max Primary Beam Intensity2×10 6 s -1 2×10 7 s -1 Counting Rate at S11×10 4 s -1 1×10 5 s -1 Counting Rate at S21×10 4 s -1 Counting Rate 132 Sn140 s -1 350 s -1 Width of the x distribution at S2 [cm] 2420

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Primary beam position, charge states Normal setup fully stripped: Pos. at S1: 15.0 cm Pos. at S2: -46.3 cm one electron: Pos. at S1: 12.7 cm Pos. at S2: -39.3 cm two electrons: Pos. at S1: 10.4 cm Pos. at S2: -32.2 cm Modified setup fully stripped: Pos. at S1: 13.5 cm Pos. at S2: -41.8 cm one electron: Pos. at S1: 11.2 cm Pos. at S2: -34.7 cm two electrons: Pos. at S1: 8.9 cm Pos. at S2: -27.6 cm

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