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## PowerPoint Slideshow about 'pE3 beam' - medwin

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pE3 beam

- Beam Layout
- Beam dynamics
- Measurements
- Tuning instrumentation and plan

References:

http://www.npl.uiuc.edu/exp/mucapture/coll/beam/beam.html

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

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

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.

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.

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