The CDF Run IIb silicon detector Aoki, M.; Bacchetta, N.; Behari, S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2004, Letnik:
518, Številka:
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Fermilab plans to deliver 5–15
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−1 of integrated luminosity to the CDF and D0 experiments. The current inner silicon detectors at CDF (SVXIIa and L00) will not tolerate the radiation dose ...associated with high-luminosity running and will need to be replaced. A new readout chip (SVX4) has been designed in radiation-hard 0.25
μm, CMOS technology. Single-sided sensors are arranged in a compact structure, called a stave, with integrated readout and cooling systems. This paper describes the general design of the Run IIb system, testing results of prototype electrical components (staves), and prototype silicon sensor performance before and after irradiation.
The CDMS low ionization threshold experiment (CDMSlite) uses cryogenic germanium detectors operated at a relatively high bias voltage to amplify the phonon signal in the search for weakly interacting ...massive particles (WIMPs). Results are presented from the second CDMSlite run with an exposure of 70 kg day, which reached an energy threshold for electron recoils as low as 56 eV. A fiducialization cut reduces backgrounds below those previously reported by CDMSlite. New parameter space for the WIMP-nucleon spin-independent cross section is excluded for WIMP masses between 1.6 and 5.5 GeV/c^2.
Psychosis-like experiences may be clinically significant given their demonstrated associations with concurrent psychological distress and the later development of diagnosable psychotic disorders. ...Prior studies of treatment for psychosis-like experiences have yielded conflicting results. The aims of this study were to investigate help seeking and need for care among individuals with psychosis-like experiences in a large general population sample. Data from the Collaborative Psychiatric Epidemiology Surveys (N=10,541) were used to examine help-seeking behaviors among survey respondents who reported psychosis-like symptoms over a 12-month period. Adjusted odds ratios were calculated for a variety of help-seeking variables, with control for demographic factors and co-occurring psychiatric conditions. Among the 10,541 respondents, 3.4% reported a psychosis-like experience in the past 12 months. Respondents who reported psychosis-like experiences were more than twice as likely as those who did not to seek treatment. Those who reported such experiences but who did not seek treatment were more likely to have felt the need for or to have been encouraged by others to seek treatment and less likely to have felt that they had no psychiatric problem. Associations with unmet need for care were largely attributable to co-occurring psychiatric disorders. Respondents with psychosis-like experiences had elevated rates of help seeking, as well as significant unmet clinical need among those not in treatment.
We report on the calibration and performance of a large lead liquid-argon electromagnetic calorimeter used by experiment E706 at Fermilab. The reconstructed π
0 mass was used to calibrate the energy ...response of the calorimeter. The systematic uncertainty in the linearity and uniformity of the mean-energy response of the calorimeter after calibration was found to be less than ±0.5% for the sample of data analyzed. Detector characteristics, including sampling fluctuations and position resolution, are discussed.
This study examined knowledge of New York's Assisted Outpatient Treatment law, enacted November 1999, among adult siblings of persons with mental illness. Mailed survey responses collected between ...April, 2000 and September, 2001 from 100 siblings residing in New York State were reviewed. Only 48% acknowledged familiarity with the law. Possessing higher education, reading about mental illness more often, planning to occupy future caregiving roles, maintaining membership in a support group, and reporting that their siblings experienced more difficulties with treatment compliance were associated with a familiarity with the law. Among those aware of the law, two thirds incorrectly believed eligibility for a court order was contingent on a history of violent behavior. Low rates of general awareness and knowledge of the law highlight the need for further community education.
This study examines the complex and varied effects associated with having a brother or sister with a severe and persistent mental illness (SPMI) on the lives of adult siblings without chronic ...disability. Through five focus group interviews, 19 participants were asked to describe the impact that having a brother or sister with mental illness had on their lives. Codes and categories derived from the text of the transcribed interviews were grouped into broad themes. The respondents described the manifestations and challenges of contending with the SPMI of an adult sibling. They focused on gaps in services and communication with mental health providers, particularly with regard to timing of interventions and identifying readiness for treatment, as well as their own mental health needs. The article concludes with a discussion of the increased need for exchange of information and clarity of communication among family members and providers, following best practice guidelines that are well documented but not well implemented.
The systematic uncertainty on the correspondence between muon range and energy is developed for the NOvA neutrino experiment. NOvA consists of two detectors, the Near Detector at Fermilab and the Far ...Detector in northern Minnesota. Total errors are developed for the Near Detector, with its Muon Catcher treated separately, the Far Detector, and all combinations of correlated and uncorrelated errors between these three detectors. The absolute errors for the Near Detector (1.0%), the Far Detector (0.9%), and the fully correlated error shared by them (0.9%) are strongly dominated by Geant4's treatment of the Bethe density effect. At the Near Detector, the next biggest uncertainty is from stray hits caused by neutron capture pile-up. Other contributions are marginally significant, with the biggest, in descending order, being due to external measurements of the mean excitation energies of elements, detector mass accounting, and modification of energy loss by chemical binding. For the Muon Catcher, the absolute error is expressed as an offset instead of a percentage: 21 MeV. The density effect (at higher energies) and neutron capture pile-up (at lower energies) are the strongly dominant errors. The relative error between the Near and Far Detectors is 0.4% and is strongly dominated by neutron capture pile-up at the Near Detector, with a subdominant contribution from detector mass accounting.
Cryogenic calorimetric experiments to search for neutrinoless double-beta
decay ($0\nu\beta\beta$) are highly competitive, scalable and versatile in
isotope. The largest planned detector array, ...CUPID, is comprised of about 1500
individual Li$_2^{100}$MoO$_{4}$ detector modules with a further scale up
envisioned for a follow up experiment (CUPID-1T). In this article, we present a
novel detector concept targeting this second stage with a low impedance TES
based readout for the Li$_2$MoO$_{4}$ absorber that is easily mass-produced and
lends itself to a multiplexed readout. We present the detector design and
results from a first prototype detector operated at the NEXUS shallow
underground facility at Fermilab. The detector is a 2-cm-side cube with 21$\,$g
mass that is strongly thermally coupled to its readout chip to allow rise-times
of $\sim$0.5$\,$ms. This design is more than one order of magnitude faster than
present NTD based detectors and is hence expected to effectively mitigate
backgrounds generated through the pile-up of two independent two neutrino decay
events coinciding close in time. Together with a baseline resolution of
1.95$\,$keV (FWHM) these performance parameters extrapolate to a background
index from pile-up as low as $5\cdot 10^{-6}\,$counts/keV/kg/yr in CUPID size
crystals. The detector was calibrated up to the MeV region showing sufficient
dynamic range for $0\nu\beta\beta$ searches. In combination with a SuperCDMS
HVeV detector this setup also allowed us to perform a precision measurement of
the scintillation time constants of Li$_2$MoO$_{4}$. The crystal showed a
significant fast scintillation emission with O(10$\,\mu$s) time-scale, more
than an order below the detector response of presently considered light
detectors suggesting the possibility of further progress in pile-up rejection
through better light detectors in the future.
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