Publications In Preparation » History » Revision 36

Revision 35 (Brown, Craig, 29 June 2020 11:35) → Revision 36/41 (Brown, Craig, 29 June 2020 11:43)

h1. Preliminary results prepared for presentation at conferences 


 h2. Multiple Coulomb Scattering in Lithium Hydride Absorbers (Preliminary) 

 h3. Abstract 

 bq. Multiple coulomb scattering is a well known electromagnetic phenomenon experienced by charged particles traversing materials. However,    from recent measurements by the MuScat experiment it is known that the available simulation codes, specifically GEANT4, overestimate the scattering of muons in low Z materials. This is of particular interest to the Muon Ionization Cooling Experiment (MICE) which has the goal of measuring the reduction of a muon beam emittance induced by energy loss in low Z absorbers. Multiple scattering induces positive changes in the emittance in contrast to the reduction due to ionization energy loss. It therefore is essential that MICE measures multiple scattering for its absorber materials; lithium hydride and liquid hydrogen; and validate the multiple scattering against known simulations. MICE took data with magnetic fields off suitable for multiple scattering measurements in the spring of 2016. 

 h2. Figures 

 "Fig. 1": "Fig. 2": "Fig. 3": "Fig 5": "Fig 6":,%22JPG%22: "Fig 7":,%22JPG%22: "Fig 8": "Fig 9": "Fig 10": "Fig 11": "Fig 12": "Fig 13": "Fig 14": "Fig 15": "Fig 16": "Fig 17": "Fig 18": "Fig 19": "Fig 20": "Fig 21": "Fig 22": "Fig 23": 

 h2. Tables 

 "Tab. 1":    "Tab. 2": 

 *[[Multiple Coulomb Scattering in Lithium Hydride Absorbers|Details]]* 


 h2. Energy Loss in Lithium Hydride and Hydrogen Absorbers (Preliminary) 

 h3. Abstract 

 bq. The cooling term of the ionization cooling equation is given by the "Bethe equation". A better understanding of the equation in hydrogen and lithium hydride is necessary in order to make more realistic predictions of the emittance reduction. 
 Data has been taken for several different muon beams traversing the lithium hydride absorber. 
 MICE measures the momentum upstream and downstream of the absorber using information from the trackers combined with measurements of the time of flight. 

 h3. Figures 

 "Fig. 1": "Fig. 2": 

 *[[Energy Loss|Details]]* 


 h2. Emittance Exchange in MICE (Preliminary) 

 h3. Abstract 

 bq. The Muon Ionization Cooling Experiment, MICE, has demonstrated transverse emittance reduction through ionization 
 cooling. Transverse ionization cooling can be used either to prepare a beam for acceleration in a neutrino factory or 
 for the initial stages of beam cooling in a muon collider. Later stages of ionization cooling in the muon collider require 
 the longitudinal emittance to be manipulated using emittance exchange and reverse emittance exchange, where 
 emittance is exchanged from and to longitudinal phase space respectively. A wedge absorber within the MICE cooling 
 channel has been used to experimentally study reverse emittance exchange in ionization cooling. Parameters 
 for this test have been explored in simulation and applied to experimental configurations using a wedge absorber 
 when collecting data in the MICE beam. 

 h3. Figures 

 "Fig. 1": 

 "Fig. 1": "Fig. 2": "Fig. 3": "Fig. 4": "Fig. 5": "Fig. 6": "Fig. 7": "Fig. 8": "Fig. 9": 

 *[[Emittance Exchange|Details]]* 


 h2. Normalized Transverse Emittance Reduction in MICE 'Flip' Mode 

 h3. Abstract 

 bq. Low emittance muon beams are central to the development of facilities such as a Neutrino Factory or a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) was designed to demonstrate and study the cooling of muon beams. Several million individual muon tracks have been recorded passing through a liquid hydrogen or a lithium hydride absorber. Beam sampling routines were employed to account for imperfections in beam matching at the entrance into the cooling channel and enable an improvement of the cooling performance. A study of the change in normalized transverse emittance in a flipped polarity magnetic field configuration is presented and the characteristics of the cooling effect are discussed. 

 h3. Figures 

 "Fig. 1": "Fig. 2": "Fig. 3": "Fig. 4": "Fig. 5": 

 *[[Emittance Reduction in MICE Flip Mode|Details]]* 


 h2. Transverse Emittance Change in MICE ‘Solenoid Mode’ with Muon Ionization Cooling 

 h3. Abstract 

 bq. Emittance reduction of muon beams is an important requirement in the design of a next-generation Neutrino Factory or Muon Collider. Ionization cooling has been proposed to meet this requirement, whereby beam emittance is reduced by passing a beam through absorbing material. Tight focussing is required in both horizontal planes, which is achieved in many designs using solenoid focussing. Ionization cooling has been demonstrated in the Muon Ionization Cooling Experiment (MICE) in 'flip' mode, where the solenoid field flips polarity across the absorber. We present the performance of MICE in 'solenoid' mode, where the field polarity does not change across the absorber. 

 h3. Figures 

 "Fig. 1": "Fig. 2": "Fig. 3": "Fig. 4": 

 h3. Posters 

 "Neutrino 2020": 

 *[[Transverse Emittance Change in MICE Solenoid Mode|Details]]*