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

2. ISIS Beam Line A B C

3. Array is offset from x,y = 0,0.
Beam Spot at z = m
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. Matsushita Electric Works

5. Matsushita Aerogel Samples
n=1.03
n=1.07(1.08)
n=1.12
115 x 115 x 10.5 mm3
115 x 115 x 11.5 mm3

6. T = A exp{ -t C/l4} Rayleigh-like
Transmittance
T = A exp{ -t C/l4} Rayleigh-like
C =0.041
1.03
n A C
t(nm) sample thickness
(nm) wavelength
0.252
1.07
0.638
1.12
Blue photons are scattered w dN/dq = 1+cos2.
Absorption minimal.

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

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

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

11. Design (1)

12. Aerogel Counter Design

13. Dimensions (3)

14. Radiator (2)
Collection Mirror
Radiator

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

16. Summer ‘06  = 1 @ FNAL 1x1x1 module white reflector Measure pe yields
Pricing/Road Map
Price (2 det)
-64 Aerogel x $350USD ~ $20K
-Reflectors $5K
-Steele Boxes $5K
-Table $5K
-Installation and checkout $5K
-Shipping $5K
-(8-10) PMTs HARP -
-Parts Fabricated in UM shop.
-Mechanical Drawings UL.
Summer ‘06  = FNAL 1x1x1 module white reflector Measure pe yields
Spring ‘07 Assembly
Fall- 06 Mechanical fabrication Reflectors/Cones Aerogel purchase
Summer ‘07 ready

17. Milestone Progress Report

18. Conclusion
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).

19. Muon Detection Efficiency (5)

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

21. Performance (2) n Npe/cm L-cm e Npe(b=1) 1.07 11.4 2.3 0.6 16