1. 1 MICE Beamline PID w Aerogel Counters Ghislain Gregoire, Don Summers, Lucien Cremaldi*, MICE Collaboration Meeting, FNAL, Jun 06

2. 2 A B C ISIS - Muon Transfer Line

3. 3 Beam Spot at z = Beam Spot at z = 20.763.4m 4x4 Aerogel Array Provides ample coverage. ~95% containment in 3x3. Array is offset from x,y = 0,0. Triangle tiles can reduce cost. Variation of Beam Spot size over counter length is minimal. Triangle tiles

4. 4 Matsushita Electric Works 1.030+-0.001

5. 5 Matsushita Aerogel Samples n=1.03n=1.07(1.08)n=1.12 115 x 115 x 10.5 mm 3 115 x 115 x 11.5 mm 3

6. 6 0.638 C =0.041 0.252 T = A exp{ -t C/ 4 } Rayleigh-like nAC 1.0398.990.041 1.0898.840.252 1.1296.960.638 t(nm) sample thickness (nm) wavelength Transmittance Blue photons are scattered w dN/dq = 1+cos 2 . Absorption minimal. 1.03 1.07 1.12

7. 7 Performance (1) Run Configuration of good Mu/Pi (T.Roberts) Muons Peaking at 220 MeV/ c Pion show high energy tail (p>350 MeV/c removed by tracking??) 16200 280

8. 8 Performance (2) nNpe/cmL-cm e Npe(b=1) 1.0711.42.3 0.6 16 1.1218.32.3 0.6 25

9. 9 Muon Detection Efficiency The efficiency at low momenta could be improved by increasing the thickness of the radiator The efficiency drop at low momenta is due to the proximity of the muon threshold in n=1.12 aerogel

10. 10 Unambiguous separation of muons and pionsMisidentified pions in the range 285 to 320 MeV/c (32 pions / 385 muons) Remember: the pion sample is exaggerated by a factor 40 i.e. an actualpion impurity in this configuration only There is no need for a momentum cut Momentum distributions of triggers

11. 11 Aerogel Counter Design

12. 12 Design (1)

13. 13 Dimensions (2)

14. 14 Radiator (3) Collection Mirror Radiator

15. 15 Fermilab Test Beam July ‘06 200 GeV  aerogel mirror Rotating Table Beam 200 GeV  Aerogel 1.03, 1.07, 1.12 PE yield vs incident angle Sr90 Measurements

16. 16 Pricing/Road Map Tentative Pricing (2 det) -70 Aerogel x $350USD ~ $25K -Reflectors $5K -Steele Boxes $5K -Table $5K - Electronics (8 ch)$5K -Installation and checkout$5K -Shipping$5K -(8-10) PMTs HARP - -Parts Fabricated in UM shop. -Mechanical Drawings UL. Summer ‘06  = 1 @ FNAL Tests 1x1x2 module white diffuse reflector Measure pe yields Spring ‘07 Assembly Fall- 06 Mechanical fabrication Reflectors/Cones Aerogel purchase Summer ‘07 ready

17. 17 Aerogel Technology well suited to tag   in MICE beamline. Photoelectron yield adequate for high efficiency and low misid rate. Mechanical design highly advanced. Fabrication staightforward. Ready to install in MICE in summer ‘07. TRD Update & Saftey Sheets ~completed (Ghislain). Conclusion

18. 18 Milestone Progress Report

19. 19 Muon Detection Efficiency (5)

20. 20 Performance (3) n=1.12 muon n=1.12 pion n=1.07 pion n=1.07 muon

21. 21 Purity Matrix(4) Purity = Percent of good muons for a particular Trigger Configuration. P  = Muon Purity >99%P  = Pion Misid < 1.2 x 10 -4 Purity (4)