| Paper |
Title |
Page |
| MOPCH189 |
Calculating the Muon Cooling within a MICE Liquid Absorber
|
502 |
| |
- M.A. Green, S.P. Virostek
LBNL, Berkeley, California
- S.Q. Yang
OXFORDphysics, Oxford, Oxon
|
|
| |
The key elements of the Muon Ionization Cooling Experiment (MICE) cooling channel are the absorbers that are a part of the MICE absorber focus coil modules (AFC modules). The boundaries of room temperature solid absorbers are well defined. The density of most solid absorber materials is also well understood. The properties of solid absorber are most certainly understood to 0.3 percent. The MICE liquid absorbers are different in that their dimensions are a function of the absorber temperature and the fluid pressure within the absorber. The second element in the liquid absorber is the variability of the liquid density with temperature and pressure. While one can determine the absorber boundary within 0.3 percent, the determination of the liquid density within 0.3 percent is more difficult (particularly with liquid helium in the absorber). This report presents a method of calculating absorber boundary and the cooling performance of the MICE absorbers as a function of fluid temperature and pressure.
|
|
| TUPCH145 |
The MUCOOL RF Program
|
1358 |
| |
- J. Norem
ANL, Argonne, Illinois
- A. Bross, A. Moretti, B. Norris, Z. Qian
Fermilab, Batavia, Illinois
- D. Li, S.P. Virostek, M.S. Zisman
LBNL, Berkeley, California
- R.A. Rimmer
Jefferson Lab, Newport News, Virginia
- R. Sandstrom
DPNC, Genève
- Y. Torun
IIT, Chicago, Illinois
|
|
| |
Efficient muon cooling requires high RF gradients in the presence of high (~3T) solenoidal fields. The Muon Ionization Cooling Experiment (MICE) also requires that the x-ray production from these cavities is low, in order to minimize backgrounds in the particle detectors that must be located near the cavities. These cavities require thin Be windows to ensure the highest fields on the beam axis. In order to develop these cavities, the MUCOOL RF Program was started about 6 years ago. Initial measurements were made on a six-cell cavity and a single-cell pillbox, both operating at 805 MHz. We have now begun measurements of a 201 MHz pillbox cavity. This program has led to new techniques to look at dark currents, a new model for breakdown and a general model of cavity performance based on surface damage. The experimental program includes studies of thin Be windows, conditioning, dark current production from different materials, magnetic-field effects and breakdown. We will present results from measurements at both 805 and 201 MHz.
|
|
| WEPLS114 |
Progress on the MICE Tracker Solenoid
|
2646 |
| |
- M.A. Green, S.P. Virostek
LBNL, Berkeley, California
- W. Lau, S.Q. Yang
OXFORDphysics, Oxford, Oxon
|
|
| |
This report describes the 400 mm warm bore tracker solenoid for the Muon Ionization Cooling Experiment (MICE). The 2.923 m long tracker solenoid module includes the radiation shutter between the end absorber focus coil modules and the tracker as well as the 2.780 meter long magnet cryostat vacuum vessel. The 2.554 m long tracker solenoid consists of two sections, a three-coil spectrometer magnet and a two-coil matching section that matches the uniform field 4 T spectrometer solenoid into the MICE cooling channel. The two tracker magnets are used to provide a uniform magnetic field for the fiber detectors that are used to measure the muon beam emittance at the two ends of the cooling channel. This paper describes the design for the tracker magnet coils and the 4.2 K cryogenic coolers that are used to cool the superconducting magnet. Interfaces between the magnet and the detectors are discussed.
|
|
| TUPCH148 |
201 MHz Cavity R&D for MUCOOL and MICE
|
1367 |
| |
- D. Li, S.P. Virostek, M.S. Zisman
LBNL, Berkeley, California
- A. Bross, A. Moretti, B. Norris
Fermilab, Batavia, Illinois
- J. Norem
ANL, Argonne, Illinois
- H.L. Phillips, R.A. Rimmer, M. Stirbet
Jefferson Lab, Newport News, Virginia
- M. Reep, D.J. Summers
UMiss, University, Mississippi
- Y. Torun
IIT, Chicago, Illinois
|
|
| |
We describe the design, fabrication and preliminary testing of the prototype 201 MHz copper cavity for a muon ionization cooling channel. Application of the cavity includes the Muon Ionization Cooling Experiment (MICE) as well as cooling channels for a neutrino factory or a muon collider. This cavity was developed by the US MUCOOL collaboration and is being tested in the MUCOOL Test Area (MTA) at Fermilab. In order to achieve a high accelerating gradient, the cavity beam irises are terminated by a pair of curved, thin beryllium windows. Several of the fabrication methods developed for this cavity and the windows are novel and offer significant cost savings compared to conventional construction methods. Cavity thermal and RF performance will be compared to FEA modeling predictions. RF commissioning results will be presented.
|
|