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Enhancing Beam Analysis: Emittance Reduction Strategies

Exploring emittance reduction through beam selection, RF tuning, and matching in beam simulations. Analysis includes Gaussian beam spread effects and evaluation of reference muon impact on emittance. Further investigation needed for new diffuser suitability. More enhancements to come!

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Enhancing Beam Analysis: Emittance Reduction Strategies

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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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