170 research outputs found
An 8 GEV Linac As The Booster Replacement In The Fermilab Power Upgrade
Increasing the Fermilab Main Injector (MI) beam power above ~1.2 MW requires
replacement of the 8 GeV Booster by a higher intensity alternative. Earlier,
rapid-cycling synchrotron and linac solutions were considered for this purpose.
In this paper, we consider the linac version that produces 8 GeV H- beam for
injection into the Recycler Ring (RR) or MI The new linac takes ~1 GeV beam
from the PIP-II linac and accelerates it to ~ 2 GeV in a 650 MHz SRF linac, and
then accelerates to ~8 GeV in an SRF pulsed linac using 1300 MHz cryomodules.
The linac components incorporate recent improvements in SRF technology. This
Booster Replacement linac (BRL) will increase MI beam power to DUNE to more
than 2.5 MW and enable next-generation intensity frontier experiments.Comment: arXiv admin note: text overlap with arXiv:2203.0505
Ab Initio Liquid Hydrogen Muon Cooling Simulations with ELMS in ICOOL
This paper presents new theoretical results on the passage of muons through
liquid hydrogen which have been confirmed in a recent experiment. These are
used to demonstrate that muon bunches may be compressed by ionisation cooling
more effectively than suggested by previous calculations.
Muon cooling depends on the differential cross section for energy loss and
scattering of muons. We have calculated this cross section for liquid H2 from
first principles and atomic data, avoiding traditional assumptions. Thence, 2-D
probability maps of energy loss and scattering in mm-scale thicknesses are
derived by folding, and stored in a database. Large first-order correlations
between energy loss and scattering are found for H2, which are absent in other
simulations. This code is named ELMS, Energy Loss & Multiple Scattering. Single
particle trajectories may then be tracked by Monte Carlo sampling from this
database on a scale of 1 mm or less. This processor has been inserted into the
cooling code ICOOL. Significant improvements in 6-D muon cooling are predicted
compared with previous predictions based on GEANT. This is examined in various
geometries. The large correlation effect is found to have only a small effect
on cooling. The experimental scattering observed for liquid H2 in the MUSCAT
experiment has recently been reported to be in good agreement with the ELMS
prediction, but in poor agreement with GEANT simulation.Comment: 6 pages, 3 figure
An Integrated Circuit for Signal Processing of the AMS RICH Photmultipliers Tubes
An analog integrated circuit has been designed, in a BiCMOS 0.8 micron
technology, for the feasability study of the signal processing of the AMS RICH
photomultiplier tubes. This low power, three channel gated integrator includes
its own gate and no external analog delay is requiered. It processes PMT pulses
over a dynamic range of more than 100. A logic output that indicates whether
the analog charge has to be considered is provided. This gated integrator is
used with a compact DSP based acquisition system in a 132 channels RICH
prototype. The charge calibration of each channel is carried out using a LED.
The pedestal measurement is performed on activation of a dedicated input. The
noise contribution study of the input RC network and amplifiers is presented.Comment: IEEE symp. on Nucl. Sci. and Med. Imaging, Toront
Muon Collider
Both e+e- and {\mu}+{\mu}- colliders have been proposed as possible
candidates for a lepton collider to complement and extend the reach of the
Large Hadron Collider (LHC) at CERN. The physics program that could be pursued
by a new lepton collider (e+e- or {\mu}+{\mu}-) with sufficient luminosity
would include understanding the mechanism behind mass generation and
electroweak symmetry breaking; searching for, and possibly discovering,
supersymmetric particles; and hunting for signs of extra spacetime dimensions
and quantum gravity. However, the appropriate energy reach for such a collider
is currently unknown, and will only be determined following initial physics
results at the LHC. It is entirely possible that such results will indicate
that a lepton collider with a collision energy well in excess of 1 TeV will be
required to illuminate the physics uncovered at LHC. Such a requirement would
require consideration of muons as the lepton of choice for such a collider.Comment: v.2., 6 pp. To appear in the 2nd edition of the book Elementary
Particles, Landolt-Boernstein Series published by Springer. arXiv admin note:
text overlap with arXiv:physics/9901022 by other autho
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