MICE Beamline Analysis – TRD SEPT04

1. MICE Beamline Analysis – TRD SEPT04 Tom Roberts Muons, Inc. February 10, 2005 MICE Beamline Analysis -- TRD SEPT04

2. Outline • Brief Summary of the SEPT04 beamline designUpdated for the December 17 TRD • Brief Summary of this simulation • Summary of rates • Particle Distributions in PID Counters and the downstream IronShield MICE Beamline Analysis -- TRD SEPT04

3. TRD SEPT04 Layout ISIS Beam Iron Shield TOF0 TOF1 Diffuser Iron Shield TOF2 Ckov2Cal Proton Absorber Ckov1 MICE Beamline Analysis -- TRD SEPT04

4. Summary of the SEPT04 Beamline Design * The intent of the design is for 206 MeV/c in Tracker1, but various energy losses were not accounted for in the design; this is the actual value achieved. MICE Beamline Analysis -- TRD SEPT04

5. Summary of this Simulation • A significant improvement in realism: • First guess of the beamline vacuum, windows, air gaps, etc. • More detailed implementation of Tracker1 and Tracker2 • Vacuum with windows • 5 planes, 1.5 mm scintillator each, located as in the TRD (Dec 17 2004) • TRD (Dec 17 2004) configurations for everything except a few minor things (absorber and RF window shapes) MICE Beamline Analysis -- TRD SEPT04

6. Summary of Rates Values are events per millisecond of Good Target; absorbers empty, no RF. Good μ+ = TOF0 & TOF1 & Tracker1 & Tracker2 & TOF2 & TOF1(μ+) & TOF2(μ+) Major changes from before:2 in. total thickness of TOF0 and TOF1  ~20% reduction in Good μ+~50% larger target acceptance  ~10% increase in TOF0 singles, ~1% in Good μ+. MICE Beamline Analysis -- TRD SEPT04

7. Momentum Histograms (Placed together to facilitate comparisons) MICE Beamline Analysis -- TRD SEPT04

8. PID Counter Distributions • Same simulation, except: • The downstream IronShield is physically removed • Its effect on the magnetic field remains • Replaced by a virtualdetector 800 mm square (Air) at its downstream face • All counters are made large enough to see everything • TOF0, TOF1, TOF2 are 800 mm square • Cherenkov1 is 800 mm square • Tracker1 and Tracker2 are 200 mm in radius • Cherenkov2 is 800 mm in radius • Calorimeter is 2000 mm square • Relaxed ThroughParticle Trigger: requires only 15 hits out of 17 counters (i.e. nothing after TOF2 is required) • Good-μ+ = ThroughParticle & TOF1(μ+) & TOF2(μ+) • The TRD size of each counter is displayed as a green overlay on each plot. MICE Beamline Analysis -- TRD SEPT04

9. TOF0 TRD Size 480x480 MICE Beamline Analysis -- TRD SEPT04

10. Cherenkov1 TRD Size 400x400 MICE Beamline Analysis -- TRD SEPT04

11. TOF1 TRD Size 480x480 MICE Beamline Analysis -- TRD SEPT04

12. Iron Shield (hole) TRD Size r=250 Missed mu+ = 8, Singles=1326 Good mu+=1321 MICE Beamline Analysis -- TRD SEPT04

13. TOF2 - X TRD Size 480x480 Missed mu+ = 5, Singles=1326 Good mu+=1321 MICE Beamline Analysis -- TRD SEPT04

14. TOF2 - Y TRD Size 480x480 Missed mu+ = 4, Singles=1326 Good mu+=1321 MICE Beamline Analysis -- TRD SEPT04

15. Cherenkov2 - r TRD Size r=400 Missed mu+ = 3, Singles=1326 Good mu+=1321 MICE Beamline Analysis -- TRD SEPT04

16. Calorimeter - X TRD Size 1200x1200 Missed mu+ = 1, Singles=1326 Good mu+=1321 MICE Beamline Analysis -- TRD SEPT04

17. Calorimeter - Y TRD Size 1200x1200 Missed mu+ = 1, Singles=1326 Good mu+=1321 MICE Beamline Analysis -- TRD SEPT04

18. Conclusions • The December 17, 2004 TRD includes minor changes from earlier beamline analyses. • The major one is in TOF thicknesses, which costs about 20% in the good mu+ rate • The PID counter sizes in the TRD miss ~0.7% of the good mu+. • The hole in the downstream IronShield kills ~0.6% of the good mu+. Most of these are the same mu+ missed by TOF2. MICE Beamline Analysis -- TRD SEPT04