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p E3 beam

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p E3 beam

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  1. pE3 beam • Beam Layout • Beam dynamics • Measurements • Tuning instrumentation and plan References: http://www.npl.uiuc.edu/exp/mucapture/coll/beam/beam.html

  2. Layout and tune

  3. 0 27 QSB 18.5 17 valve 11.5 7.5 104.5 separator 756 7.5 193.5 11.5 14 756 22 slit 3 36.5 845 2.5 50 slit 4 kicker 205 845 4.5 50 QSM 50 QSM 424 15 1006.5 valve 13 14 50 QSM 2.5 7 QSK 1006.5 50 19.5 16.5 36.5 QSL 70 3 40 1167.5 1122.0 End QSK 50 2.5 641 80.5 12.5 22 slit 3 756 slit 3 From P. Debevec QSB to end of configurations 2&3 22 slit 3 36.5 2.5 50 slit 4 4.5 50 QSM 50 QSM configuration 2 50 QSM 7 19.5 16.5 125 End configuration 3

  4. Dispersive Focus ? Standard MuLan dispersive

  5. Dispersive focus? dispersive Standard MuLan

  6. MuLan measurements standard dispersive

  7. Peter and Steve measurements Ref: http://www.npl.uiuc.edu/exp/mucapture/notes/piE3.pdf On the last days of the summer 2003 MuLan run, Steve and Peter investigated the performance of the piE3/MuLan beam for 34 MeV/c mu-. The separator was probably around 160 KV. Our detectors were located immediately after the beam window of configuration 3. S1 15x15x3 mm3 S2 15x15x3 mm3 ~3x3 cm2 FWHM, MuLan

  8. Mu- measurements cont’d Separator scan. ("muminus500b") The S2 rate includes beam e and Michel e. The mS1 rate counts muons and Michel electrons. The small coinc rate mS1*S2 limits the Michel contribution to <5%. As a better estimate one could scale the S2 rate to the mS1 electron peak and subtract. The eS1 rate indicated some uncounted contribution of muon and electrons to mS1. The comparison S2 with mS1 suggests a ~10 % e contamination at separator B=700 DAC.

  9. Mu- measurements cont’d degader eSC1 eSC2 Cu Conclusions ·30kHz mu- certainly possible. Focus ok, electrons ok. Momentum bin has to be reduced, needs simulation and experiment. Consistency with mu+ measurments? ·MORE mode: Problems rate: probable 200k achievable, with acceptable e contamination. If that can be achieved with 2 % momentum variance has to be studied. Finally, effect of kicker RF on sensitive chambers needs to be tested experimentally.

  10. Instrumentation beam studies SWIC Beam pipe with welded window flange

  11. August tuning plan Discuss in workgroup Francoise coordinator ?