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P 2Q

FPD OVERVIEW. P 2Q. D2. D1. P_bar. p. Q 3. Q 4. Q 4. Q 3. Q 2. Q 2. S. A2I. S. A1I. P1D. P2D. 57. 33. 23. 0. 23. 33. AT THE PROTON SIDE WE HAVE THAT THE RATIOS OUT/IN ARE. SEPARATOR. Protons. IP2D ~100 kHz. IP1D ~26 kHz. IP2D / IP1D EP1D / EP2D 5.12 5.22

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P 2Q

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  1. FPD OVERVIEW P2Q D2 D1 P_bar p Q3 Q4 Q4 Q3 Q2 Q2 S A2I S A1I P1D P2D 57 33 23 0 23 33

  2. AT THE PROTON SIDE WE HAVE THAT THE RATIOS OUT/IN ARE SEPARATOR Protons IP2D ~100 kHz IP1D ~26 kHz IP2D / IP1D EP1D / EP2D 5.12 5.22 5.28 18.0 22.08 18.0 6.88 25.68 5.6 22.2 SEPARATOR antiprotons EP1D ~25 kHz EP2D ~0.5 kHz

  3. According to the rate ratio there are ~6 times more particles after the proton bunch crosses the separator. Also there is a factor of ~20 in the rate at the outside of the same separator for the antiproton bunch. These numbers indicate that particles are being created in the separator; these problems may be due to beam-gas scattering or to misalignment of the separator with respect to the beam. Need to make some tests like turn on the vacuum pump of the separator more often, turn on/off the HV of the separator to see if some change is made. Other tests could be to measure the halo rates with other pots at the same stations in order to check if the rates are the same at the four positions within the same castle.

  4. AT THE ANTIPROTON SIDE WE HAVE THAT THE RATIOS OUT/IN ARE SEPARATOR Protons EA2I ~10 kHz EA1I ~20 kHz EA1I / EA2I IA1I / IA2I 0.41 1.26 0.6 0.99 1.1 1.1 1.9 1.1 According to these rates separators are behaving normally SEPARATOR Antiprotons IA2I ~25 kHz IA1I ~ 40 kHz

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