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CBPM: Muon Studies
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Europe/Zurich
6/2-004 (CERN)
Participants: L. Deacon, K. Elsener, L. Gatignon, A. Gerbershagen, E. Gschwendner, E. Koukovini, A. Latina, Y. Levinsen, J. Resta Lopez, J. Pfingstner, D. Schulte, J. Snuverink, G. Sterbini, F. Stulle, A. Vivoli, Y.W. Wang
L.D. presented new results of muon background studies. Main sources of muons are scattered particles originating from the collimators and the long dipole in front of the final focus quadrupoles. Since specifications from the detector got tighter new suppressions schemes needed to be evaluated. An order of magnitude can be gained by introducing muon spoilers downstream of the collimators. An additional 17m long iron tunnel filler in front of the long dipole adds another factor 1.5, i.e. it is not very efficient. To reduce total muon flux further the scatteriung of particles in the dipoles needs to be reduced, e.g. by better collimation. J.R.L stated that some studies showed a 10mm beam pipe would reduce muons. D.S. said the current 8mm has been chosen only due to resitive wall studies. K.E. asked how many muons are created per photon. L.D. replied it would be 1e-4. K.E. asked if the photon power deposition along the BDS causes a problem. D.S. answered it is <1kW/m and thus o.k. D.S. stated that in any case the vacuum requirements have been tighted by a factor 10. This should reduce muon production by the same amount and only about 1 moun will be created per bunch crossing. K.E. said this would look quite promising. D.S. asked if it would be possible to make the detector more tolerant.
L.D. presented new results of muon background studies. Main sources of muons are scattered particles originating from the collimators and the long dipole in front of the final focus quadrupoles. Since specifications from the detector got tighter new suppressions schemes needed to be evaluated. An order of magnitude can be gained by introducing muon spoilers downstream of the collimators. An additional 17m long iron tunnel filler in front of the long dipole adds another factor 1.5, i.e. it is not very efficient. To reduce total muon flux further the scatteriung of particles in the dipoles needs to be reduced, e.g. by better collimation. J.R.L stated that some studies showed a 10mm beam pipe would reduce muons. D.S. said the current 8mm has been chosen only due to resitive wall studies. K.E. asked how many muons are created per photon. L.D. replied it would be 1e-4. K.E. asked if the photon power deposition along the BDS causes a problem. D.S. answered it is <1kW/m and thus o.k. D.S. stated that in any case the vacuum requirements have been tighted by a factor 10. This should reduce muon production by the same amount and only about 1 moun will be created per bunch crossing. K.E. said this would look quite promising. D.S. asked if it would be possible to make the detector more tolerant.
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