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Emittance Paper* Progress

V. Blackmore, J. Cobb, M. Rayner. Emittance Paper* Progress. *A.K.A. “MICE through a microscope”. Began with the numbers and plots in Mark’s thesis Very helpful for understanding what was done Plots for (6, 200) m - case only

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Emittance Paper* Progress

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  1. V. Blackmore, J. Cobb, M. Rayner EmittancePaper* Progress *A.K.A. “MICE through a microscope”

  2. Began with the numbers and plots in Mark’s thesis • Very helpful for understanding what was done • Plots for (6, 200)m- case only • Final e, a and b values existed only as plots, not numbers • Wanted to understand and replicate numbers and plots Progress

  3. And so the games begin… • Q1. Why does this happen?

  4. Q1. Why does this happen? • Needed the data • Took time to figure out what was what

  5. Q1. Why does this happen? • Needed the data. • Took time to figure out what was what • Variable confusion • Problem solved!

  6. Q2. Can we remove the resolution of the detector from our results?

  7. Q2. Can we remove the resolution of the detector from our results? • Not very easily…

  8. Q3. Can we remove horizontal dispersion?

  9. Q3. Can we remove horizontal dispersion? • Again, not easily… • Plus, saw some very odd effects!

  10. Q4. What is causing these oddities?

  11. Thankfully, Mark visited at this point • Found a bug: TOF strip calibration mix-up • Fixed data  So begin analysis again • This time we know what we are looking for!

  12. ? ? ? • Q5*: Are the simulations correct? *See analysis talk for details

  13. “140” beam “200” beam “240” beam Currentunderstanding • Feels like we’re getting closer (we certainly have a better understanding of the MICE beam) • Have re-analysed all of the data with the correct TOF calibrations • Need believable simulation to compare too • Then we can demonstrate the agreement/disagreement of our expectations with reality • But still will take time “140” beam “200” beam “240” beam

  14. Plan • Sort through simulation • Check which quadrupole field maps were used • Check signs of fields • Check G4MICE version • Then: re-evaluate G4beamline input, say, look at (6, 200) beam • Think hard! • Discover source of problem • Real or a bug? • If bug: do we now agree? • Compare reconstructed parameters with data • Quantify any (dis)agreement • Demonstrate (one) beam through MICE Step 6?

  15. Emittance “140” beam “200” beam “240” beam

  16. Beta “140” beam “200” beam “240” beam

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