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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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v blackmore j cobb m rayner
V. Blackmore, J. Cobb, M. Rayner

EmittancePaper* Progress

*A.K.A. “MICE through a microscope”

progress

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
and so the games begin
And so the games begin…
  • Q1. Why does this happen?
slide4

Q1. Why does this happen?

  • Needed the data
    • Took time to figure out what was what
slide5

Q1. Why does this happen?

  • Needed the data.
    • Took time to figure out what was what
  • Variable confusion
  • Problem solved!
slide9

Q3. Can we remove horizontal dispersion?

  • Again, not easily…
  • Plus, saw some very odd effects!
slide11

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!
slide12

?

?

?

  • Q5*: Are the simulations correct?

*See analysis talk for details

current understanding

“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

slide14
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?
emittance
Emittance

“140” beam

“200” beam

“240” beam

slide16
Beta

“140” beam

“200” beam

“240” beam

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