Particle Production in the MICE Beamline IPAC10 Linda Coney, UC Riverside, Adam Dobbs, Imperial College London, Yordan Karadzhov, Sofia University The Beam Line Fig 1. The components of the MICE beam line from the target to the KLOE Light detector Target Q1Q2Q3Q4Q5Q6Q7Q8Q9 DK sol D2D1 TOF1 TOF0 GVA1BPM1 BPM2 TOF2 CKOV-A CKOV-B KL The Muon Ionization Cooling Experiment (MICE) is being built at the Rutherford Appleton Laboratory (RAL) to test ionization cooling of a muon beam. Successful demonstration of cooling is a necessary step along the path toward creating future high intensity muon beams in either a Neutrino Factory or Muon Collider. Production of particles in the MICE beamline begins with a titanium target dipping into the ISIS proton beam. The resulting pions are captured, momentum-selected, and fed into a 5T superconducting decay solenoid which contains the pions and their decay muons. Another dipole then selects the final particles for propagation through the rest of the MICE beamline. In this poster, the commissioning of the improved MICE beamline and target will be discussed, including the use of Time-of-Flight detectors to understand the content of the MICE beam between 100 and 444 MeV/c. Introduction Fig. 2 A schematic of the MICE beamline, up to the start of the cooling channel Fig. 3 A schematic of the planned MICE cooling channel The Decay Solenoid The Target Detectors The current MICE target has been in service since September 2009, after replacing the original MICE target. During this time it has performed exceptionally well, being used to run MICE as a stand-alone experiment during ISIS machine physics periods and also parasitically during standard user runs. Methods have been developed to regularly monitor the stability of the target such as monitoring the maximum depth to which the target dips, illustrated below. Target operation studies have also been done to improve beamline performance. The decay solenoid (DS) is an important part of the MICE beamline designed to capture pions coming from the target and their decay muons. The magnet was fully functional during the MICE data-taking periods in the second half of 2009, though it then suffered difficulties with its cooler which are presently being resolved. The presence of the DS, completing the MICE beamline upstream of the cooling channel, has been shown to significantly increase the particle rate in the beam, and has enabled the start of beam optics optimization and measurements. Fig. 4 A section of the Decay Solenoid Fig. 5 The target housing in ISIS and the first MICE quadrupole triplet 0.48 m 10 x 4cm scintillator bars  x = 1.15 cm  t = 50 ps TOF m 7 x 6cm scintillator bars  x = 1.73 cm  t = 50 ps TOF1 Fig. 8 Schematics of time-of-flight stations 0 and 1 Fig. 9 Spectra showing TOF station resolution Fig. 10 A TOF station Time-Of-Flight Cherenkovs Results Fig. 12 The aerogel Cherenkov detectors Fig. 13 Sample electron data from the Cherenkovs Fig. 14 Time-of-flight distribution for 300 MeV/c electron beam Fig. 15 Time-of-flight distribution for 400 MeV/c pion to 225 MeV/c muon beam Fig. 16 Time-of-flight distribution for 337 MeV/c pion to 250 MeV/c muon beam The time-of-flight system in MICE consists of three individual detectors (TOF0, TOF1, and TOF2) located along the beamline. The first, TOF0, is just downstream of the second quadrupole triplet, the second (TOF1) is located just after the third quadrupole triplet, and the last (TOF2) will sit downstream of the cooling channel. After recent calibration runs, TOF0 and TOF1 were found to have timing resolutions of 52 ps and 58 ps respectively. Particle ID from TOFs Fig. 17 Data from TOF0 illustrating the effect on the beam of variations in the DS field from the computed nominal TOF0 y TOF0 x TOF0 2D Beam Profile DS field raised 10% DS field at nominal DS field lowered 10% Beam Profile from TOFs Fig. 18 The upper MICE beamline, including quadrupoles 1-3 and dipole 1 in the synchrotron vault Analysis continues to fully understand the MICE beam, and the TOF system is proving to be an excellent tool for this process. Not only is it used to identify muons in the beamline, it also provides beam profile information for comparison with simulations, in addition to the dedicated beam profile monitors. The Cherenkovs continue to undergo commissioning, moving toward providing another valuable method of PID for the beamline. Since first beam in the spring of 2008, the MICE Muon Beamline has advanced significantly, and is on course to provide the muon beam needed to allow MICE to demonstrate ionisation cooling. Fig. 6 Histograms showing the maximum depth of the target dip for a stable target (a) and a failing target (b) a b Fig. 7 Target DAQ display showing ISIS beam intensity (orange), MICE target position (green), and beam loss (purple) during a timing study. Fig. 11 TOF beam profiles for positive (left plot) and negative particles (right plot). Proton excess motivated switch to negative beamline. {{ TOF1TOF0 TOF1 x x y y xy xy {{