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Step I Beam Analysis: Part II

Step I Beam Analysis: Part II. Victoria Blackmore CM32, RAL, Febuary 2012. 1/14. Standing on the shoulders…. 2/14. Design b. Shamelessly stolen from Mark Rayner’s thesis (p116). Standing on the shoulders…. Mark… …Reconstructed the beam upstream of TOF1.

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Step I Beam Analysis: Part II

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  1. Step I Beam Analysis:Part II Victoria Blackmore CM32, RAL, Febuary 2012 1/14

  2. Standing on the shoulders… 2/14 Design b Shamelessly stolen from Mark Rayner’s thesis (p116)

  3. Standing on the shoulders… • Mark… • …Reconstructed the beam upstream of TOF1. • …Simulated the passage of 1 MeV slices of this beam through G4MICE Step VI. • Demonstrated emittance reduction! • What could be improved? • Beam selection, RF tuning, matching… 3/14 Design b Shamelessly stolen from Mark Rayner’s thesis (p116)

  4. Beam Selection Approximately 5’500 m+from the (6,200) m+ dataset (before TOF1): Example Mark “Momentum Slice” Pcentre +/- 0.5 MeV Very long tails Very long tails Before muon selection After muon selection*. 4/14 Pcentre = 230 MeV, s = 10 MeV * Note: The higher frequency of muons in this plot is due to it being approx. 5’500 selected muons!

  5. Simulation Procedure Step 1 data, reconstructed before TOF1.* Select a 1MeV momentum slice. Select a NF-like beam. Tune RF to each momentum slice. Tune RF to central momentum. This data set was designed to ‘match’ through a 7.5mm lead diffuser. Interested in how it behaves with the new diffuser? Wait and see… G4MICE Step VI simulation inc.Pb diffuser (7.5 mm). Apply radial cut and/or RF timing cut. Plot Remove muons with r > 150 mm, and all muons not within 0.5 ns of the reference muon at the centre of the RF cavities (optional). 5/14 *All data in this talk is from the (6, 200) m+ dataset.

  6. <Pz> 6/14 b-function is larger here

  7. b4D 7/14

  8. eN, 4D 8/14

  9. eN, 4D 9/14 Inc. RF timing cut.

  10. Tuning the Reference Muon AKA an easy lesson in how to ‘destroy’ a beam… 10/14

  11. Tuning the Reference Muon AKA an easy lesson in how to ‘destroy’ a beam… 11/14 NB: Using the RF-timing cut made these plots much more ‘boring’ (i.e. normal).

  12. A Quick Glimpse with the New Diffuser 12/14 Using the Pcentre = Pref = 230 MeV Gaussian beam, with s = 10 MeV.

  13. A Quick Glimpse with the New Diffuser 13/14 Using the Pcentre = Pref = 230 MeV Gaussian beam, with s = 10 MeV.

  14. Summary • Have expanded upon the Step I simulations through Step VI by including a Gaussian spread to the input beam. • Does have an effect on beam matching. • Similar emittance reduction. • The reference muon can have a large effect on the resulting emittance (cut dependent). • Step I beams were devised for the lead diffuser, which no longer exists. Their suitability for the new diffuser requires further investigation! • Still a lot to do… 14/14

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