1. March 30, 2004 TJR1 MICE Upstream Particle Identification Tom Roberts Illinois Institute of Technology March 30, 2004

2. March 30, 2004 TJR2 JAN04 MICE Beamline (3-D view approximately a plan view) TOF0TOF1 (MAR04 differs only by changes in magnet positions, primarily ~30% increase between TOF0 and TOF1) ISIS Beam Upstream Cherenkov (proposed) Tracker1

3. March 30, 2004 TJR3 Why These positions? TOF0 –Must be after B2 –Behind Q4 to reduce singles –As far forward as possible to maximize TOF1-TOF0 distance TOF1 –Must be after TOF0 –As far back as possible to maximize TOF1-TOF0 distance –As far back as possible to let more pi+ decay –Ahead of Q9 for magnetic shielding from Tracker1 solenoid –As far back as possible to minimize singles and pileup Cherenkov1 –Must be after TOF0 –As far back as possible to let more pi+ decay –Needs smaller magnetic field than TOF0/TOF1 –Needs more space than TOF0/TOF1 –As far back as possible to minimize singles and pileup

4. March 30, 2004 TJR4 Can we really intersperse the TOFs and Quads? Simulations show that the maximum excursion in the quads corresponds to less Δt than the TOF resolution Back of the Envelope: TOF1-TOF0 distance9 m Maximum quad aperture (“diameter”)0.472 m Sqrt(9 2 +0.472 2 )9.012 m Typical TOF1-TOF0 time25 ns Δt from path length change34 ps It seems quite reasonable to intersperse the TOFs and Quads. Besides, we don’t really have space in the hall to do otherwise.

5. March 30, 2004 TJR5 JAN04 Beamline TOF1-TOF0 Performance Includes: TOF resolution of 50 ps Momentum measured in Tracker1, with resolution 2-25 MeV/c depending on P ┴ JAN04 beamline (MAR04 has 30% longer distance) Events generated to fill the Q4 aperture, with pi/mu=1 (really ~0.02 at TOF1, ~0.002 for good-μ + ) (Red dots are bigger than blue dots)

6. March 30, 2004 TJR6 π + Beam-Related Singles Rates Normalization Program CounterLAHETGeant4MARS TOF0580271618001 TOF17809631076 Tracker1474585653 Tracker2312385431 TOF2305377421 Good Mu+ (No LH2, No RF)304375419 Rate is kHz during the 1 ms per second of good Target & RF Other backgrounds are not included.

7. March 30, 2004 TJR7 A Note About These Singles Rates In Abingdon we decided we need 600 good-mu+/second JAN04 does not achieve that rate with the target assumptions used To achieve 600 good-mu+/sec we will need to insert the target deeper into the ISIS beam (assuming losses permit that) That will increase all singles rates proportionally That implies 12-15 MHz at TOF0 is not unlikely Note that the JAN04A tune had a factor of 6x more good-mu+/sec than JAN04, with only a few percent increase in TOF0 singles – it did this by keeping more muons in the cooling channel, not by getting more into TOF0 Note also that these rates are for JAN04 – we need to simulate MAR04 and obtain corresponding rates

8. March 30, 2004 TJR8 Quad Apertures in Muon Channel