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BLM Data from the Collimator tests in SPS and TT40

BLM Data from the Collimator tests in SPS and TT40. B. Dehning, F. Ferioli, E.B. Holzer , L. Jensen, L. Ponce and the Collimator Team 26.11.2004 Collimation WG Meeting, CERN. SPS BA5. 8 Ionization Chambers. B. B. D. D. Left out Right in. C. A. Left in / Right in Smaller gap.

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BLM Data from the Collimator tests in SPS and TT40

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  1. BLM Data from the Collimator tests in SPS and TT40 B. Dehning, F. Ferioli, E.B. Holzer, L. Jensen, L. Ponce and the Collimator Team 26.11.2004 Collimation WG Meeting, CERN E. B. Holzer

  2. SPS BA5 E. B. Holzer

  3. 8 Ionization Chambers E. B. Holzer

  4. E. B. Holzer

  5. E. B. Holzer

  6. B B D D Left out Right in C A Left in / Right in Smaller gap Left in Right in Left in / Right out C A E. B. Holzer

  7. Left in / Right out B D Left in Right in Smaller gap C B D Left in Right in C A Left out / Right in A E. B. Holzer

  8. E. B. Holzer

  9. Activation? Factor 5000 reduction in signal after 4 seconds t [s] E. B. Holzer

  10. Activation measurements in the SPS • Lit: G. Ferioli, R.L. Keizer, Analysys of the induced radioactivity in the SPS extraction channels during 1994, SL/Note 95-06 (BT) • Ionisation chamber based measurements during the fast extraction (SPS LSS6) and after to determine the remaining activation • Location of monitors: near kicker magnets and septum's • Ratio between fluence of losses and activation 2000 E. B. Holzer

  11. Decay constants • Two decay constants • t1: 1.75 s • t2: 278 s E. B. Holzer

  12. TT40 E. B. Holzer

  13. BLM5 BLM3 BLM2 BLM1 BLM4 • BLM1 – BLM4: ionization chambers • BLM5: SEM (no calibration) E. B. Holzer

  14. Number of electron pairs produced (35 eV) per litre by 4X72 bunches, at floor level. Scale in cm. From M. Magistris. Signal for 4 batches: E. B. Holzer

  15. BLM signal # protons 1 - 4 Batches on both Collimator Jaws and the TED Collimator TED BLM signal # protons E. B. Holzer

  16. Scanning the Impact Position on the Jaws BLM signal / # protons Distance from surface [mm] BLM signal Distance from surface [mm] E. B. Holzer

  17. Summary • No activation observed (Signal decreases by at least a factor 5000 when collimator moves out). • “Tails” in distributions are from the beam. • BLM signal is linear with proton intensity. • Left-right asymmetry of the shower depends on the collimator gap size and gap position. • Slight top-bottom asymmetry? • BLM signal depends on the impact position on the jaw. • Compares ~ OK with simulations (TT40). • Further analysis … E. B. Holzer

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