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Energy Spectra Comparison

This report compares energy spectra in different configurations using a fieldmap on the SC axis. It discusses the methods to generate a Gaussian beam and collect it at different points. The use of SMIN, STEPEM, and STEPH cards to set step sizes is also explored.

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Energy Spectra Comparison

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  1. Energy Spectra Comparison X. Ding AAG meeting, BNL July 16, 2015

  2. 20to4T5m Configuration (zmax = 15 m)

  3. 20to4T5m Configuration (zmax = 52 m)

  4. Fieldmap on SC axis

  5. Method • Generate simple Gaussian beam with zero emittance (launching at z = -100 cm) by MARS.INP setting and proceed through 20to2T5m and 20to4T5m configuration and transport channel; • Collect beam at z = 2 m and sum all particles • Collect beam at z = 50 m and extract the positive muon

  6. SMIN/MTSM/MTSH Cards • SMIN STEPEM STEPH STEPEM is step size for boundary finding STEPH is the step size for the physics tracking. MARS manual recommends STEPH about 10 times STEPEM, which should be about 0.1 times length of smallest volume • Two methods to set very small step size for tiny objects like BE windows. The 1st method is to set SMIN card with small step size for all materials (slow running speed). The second method is only set small step size for thin BE windows with MTSM (Real variables giving the step length for boundary localization, applied only to specific materials.) and MTSH card (Real variables giving the pilot step length, applied only to specific materials.).

  7. Particle Production at z = 2 m IM5: MTSM = 0.01 and MTSH = 0.01 for BE windows Maybe need finer step in the target as well as in the Be windows!

  8. Particle Production at z = 2 m IM5: MTSM = 0.01 and MTSH = 0.01 for BE windows

  9. Mu+ at z = 50 m full BE Windows, SMIN 0.01 0.01 Results similar for MARS and ROOT setups with fine steps

  10. Mu+ at z = 50 m no BE Windows, SMIN 0.01 0.01 Results similar for MARS and ROOT setups with fine steps

  11. Setting without BE window (mu+)SMIN 0.01 3 Results similar for MARS and ROOT setups with fine STEPEM, even with larger STEPH Perfect Match

  12. Setting without BE window (mu+)SMIN 0.01 3 (MTSM & MTSH: 0.01 for BE window) Results similar for MARS and ROOT setups with fine STEPEM, even with larger STEPH

  13. Setting with BE window (mu+)SMIN 0.01 3 STEPH too large to deal with the Be windows Something wrong ?

  14. With vs. without BE window (mu+)SMIN 0.01 3 (MTSM & MTSH: 0.01 for BE window) Target may still not be dealt with well.

  15. Setting with BE window (mu+)SMIN 0.01 3 (MTSM & MTSH: 0.01 for BE window) Better processing of Be windows. Target may still not be dealt with well. STEPH is too large Should also make special setup for target region. Then use larger STEPH outside of target and Be windows.

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