Nucl.Instrum.Meth.A568:51-55,2006 In this paper we discuss the measurement of charge collection in irradiated
silicon pixel sensors and the comparison with a detailed simulation. The
simulation ...implements a model of radiation damage by including two defect
levels with opposite charge states and trapping of charge carriers. The
modeling proves that a doubly peaked electric field generated by the two defect
levels is necessary to describe the data and excludes a description based on
acceptor defects uniformly distributed across the sensor bulk. In addition, the
dependence of trap concentrations upon fluence is established by comparing the
measured and simulated profiles at several fluences and bias voltages.
IEEE Trans.Nucl.Sci.51:1150-1157,2004 This paper reports on the sensor R&D activity for the CMS pixel detector.
Devices featuring several design and technology options have been irradiated up
to a ...proton fluencec of 1E15 n_eq/cm**2 at the CERN PS. Afterward they were
bump bonded to unirradiated readout chips and tested using high energy pions in
the H2 beam line of the CERN SPS. The readout chip allows a non zero suppressed
full analogue readout and therefore a good characterization of the sensors in
terms of noise and charge collection properties. The position dependence of
signal is presented and the differences between the two sensor options are
discussed.
The design and construction of the BaBar electromagnetic calorimeter are reviewed. Recent results on the expected sensitivity of the CsI(TI) to radiation damage are discussed. The performance of the ...calorimeter in the first PEP-II run is presented. Particular emphasis is placed on operational experience and the measured degradation due to radiation damage. Correlation of radiation damage with the dose recorded in a novel large-scale array of radiation sensitive FETs are presented. The consequences for the long-term performance of a CsI(TI) calorimeter operating in a high background environment are discussed.
Nucl.Instrum.Meth.A530:71-76,2004 The tracking system of the CMS experiment, currently under construction at
the Large Hadron Collider (LHC) at CERN (Geneva, Switzerland), will include a
silicon ...pixel detector providing three spacial measurements in its final
configuration for tracks produced in high energy pp collisions. In this paper
we present the results of test beam measurements performed at CERN on
irradiated silicon pixel sensors. Lorentz angle and charge collection
efficiency were measured for two sensor designs and at various bias voltages.
ECONFC0303241:TUDT004,2003 High energy physics experiments are currently recording large amounts of data
and in a few years will be recording prodigious quantities of data. New methods
must be ...developed to handle this data and make analysis at universities
possible. We examine some techniques that exploit recent developments in
commodity hardware. We report on tests of redundant arrays of integrated drive
electronics (IDE) disk drives for use in offline high energy physics data
analysis. IDE redundant array of inexpensive disks (RAID) prices now are less
than the cost per terabyte of million-dollar tape robots! The arrays can be
scaled to sizes affordable to institutions without robots and used when fast
random access at low cost is important.
Study of decays of the Lambda c Anjos, JC; Appel, JA; Bean, A ...
Physical review. D, Particles and fields,
1990-Feb-01, 1990-2-00, 19900201, Letnik:
41, Številka:
3
Journal Article
Int.J.Mod.Phys.A20:3851-3856,2005 Progress on six dimensional ionization muon cooling with relatively small
rings of magnets is described. Lattices being explored include scaling sector
cyclotrons ...with edge focusing and strong focusing, fixed field alternating
gradient (FFAG) rings. Ionization cooling is provided by high pressure hydrogen
gas which removes both transverse and longitudinal momentum. Lost longitudinal
momentum is replaced using radio frequency (RF) cavities, giving a net
transverse emittance reduction. The longer path length in the hydrogen of
higher momentum muons decreases longitudinal emittance at the expense of
transverse emittance. Thus emittance exchange allows these rings to cool in all
six dimensions and not just transversely. Alternatively, if the RF is located
after the ring, it may be possible to cool the muons by stopping them as they
spiral adiabatically into a central swarm. As momentum goes to zero, the
momentum spread goes to zero. The resulting cooled muons can lead to an intense
muon beam which could be a source for neutrino factories or muon colliders.
Nucl.Instrum.Meth.A560:112-117,2006 A new method for the extraction of the electric field in the bulk of heavily
irradiated silicon pixel sensors is presented. It is based on the measurement
of the ...Lorentz deflection and mobility of electrons as a function of depth. The
measurements were made at the CERN H2 beam line, with the beam at a shallow
angle with respect to the pixel sensor surface. The extracted electric field is
used to simulate the charge collection and the Lorentz deflection in the pixel
sensor. The simulated charge collection and the Lorentz deflection is in good
agreement with the measurements both for non-irradiated and irradiated up to
1E15 neq/cm2 sensors.
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