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Beam Based Measurements for Stochastic Cooling Systems at Fermilab

Description: Improvement of antiproton stacking rates has been pursued for the last twenty years at Fermilab. The last twelve months have been dedicated to improving the computer model of the Stacktail system. The production of antiprotons encompasses the use of the entire accelerator chain with the exception of the Tevatron. In the Antiproton Source two storage rings, the Debuncher and Accumulator are responsible for the accumulation of antiprotons in quantities that can exceed 2 x 10{sup 12}, but more routinely, stacks of 5 x 10{sup 11} antiprotons are accumulated before being transferred to the Recycler ring. Since the beginning of this recent enterprise, peak accumulation rates have increased from 2 x 10{sup 11} to greater than 2.3 x 10{sup 11} antiprotons per hour. A goal of 3 x 10{sup 11} per hour has been established. Improvements to the stochastic cooling systems are but a part of this current effort. This paper will discuss Stacktail system measurements and experienced system limitations.
Date: September 13, 2007
Creator: Lebedev, V.A.; Pasquinelli, R.J.; Werkema, S.J. & /Fermilab
Partner: UNT Libraries Government Documents Department

Trapped Ions and Beam Coherent Instability

Description: In accelerators with negatively charged beams, ions generated from the residual gas molecules may be trapped by the beam. Trapped ions may interact resonantly with the beam and cause a beam-ion coherent instability. This coherent instability bears many similarities to the resistive wall instability and can present important limitations to those machines operation. A description of this effect requires a treatment of the beam coherent instability including both the normal machine wake field and the interaction with ions. They present a linear approach incorporating contributions from the machine impedance as well as ion forces. it also includes spreads in beam and ion frequencies and thus Landau damping. The analysis results in a modified stability diagram which will be used together with physical arguments to explain experimental observations in the Fermilab antiproton accumulator.
Date: January 1, 1992
Creator: Zhou, P.; Colestock, P.L.; Werkema, S.J. & /Fermilab
Partner: UNT Libraries Government Documents Department

Muon/electron separation for atmospheric neutrino interactions

Description: A study has been made of the ability of the Soudan 2 nucleon decay detector to distinguish between showering and non-showering particles, utilizing several different pattern recognition techniques. This work has direct application in the determination of the {nu}{sub {mu}}/{nu}{sub e} ratio for atmospheric neutrino induced events. The results of the application of these techniques to Monte Carlo data and to calibration data from the ISIS test beam are presented.
Date: August 1, 1991
Creator: Allison, W. W. M.; Barr, G. D.; Brooks, C. B.; Cobb, J. H.; Kirby-Gallagher, L. M.; Giles, R. H. et al.
Partner: UNT Libraries Government Documents Department

A search for magnetic monopoles with the Soudan 2 detector

Description: A search for GUT magnetic monopoles has been conducted using the Soudan 2 nucleon decay detector. This detector is a fine-grained tracking calorimeter. Monopole candidates were selected on the basis of significantly higher ionization than throughgoing cosmic ray muons. Preliminary results, using data taken over approximately one year with no monopoles observed, correspond to a flux limit of 2.4 10{sup {minus}14}cm{sup {minus}2}sr{sup {minus}1}s{sup {minus}1} over a velocity range of 10{sup {minus}3} < {beta} < 0.95. 8 refs.
Date: August 1, 1991
Creator: Allison, W. W. M.; Barr, G. D.; Brooks, C. B.; Cobb, J. H.; Kirby-Gallagher, L. M.; Giles, R. H. et al.
Partner: UNT Libraries Government Documents Department

Multiple Muon Events in Soudan 2

Description: This is a progress report on multiple muon events recorded by the Soudan 2 detector. 6 refs.
Date: August 1, 1991
Creator: Allison, W. W. M.; Barr, G. D.; Brooks, C. B.; Cobb, J. H.; Kirby-Gallagher, L. M.; Giles, R. H. et al.
Partner: UNT Libraries Government Documents Department

Search for AGN {nu}`s with the Soudan 2 detector

Description: We present a preliminary null result from a search for diffuse high energy neutrino emission by Active Galactic Nuclei. The method relies on the measurement of catastrophic energy loss by high energy muons in the Soudan 2 calorimeter. A Monte Carlo calculation of the energy loss of high energy muons is described.
Date: August 1, 1992
Creator: Ambats, I.; Ayres, D. S.; Balka, L. J.; Barrett, W. L.; Brock, T.; Dawson, J. W. et al.
Partner: UNT Libraries Government Documents Department

Status of the Soudan 2 detector experiment

Description: The status of the Soudan 2 experiment is discussed. The detector parameters, running schedule, and physics program are presented. Limits on proton decay, the flux of highly ionizing magnetic monopoles and neutrinos from active galactic nuclei are given.
Date: June 1, 1993
Creator: Ambats, I.; Ayres, D. S.; Balka, L.; Barrett, W. L.; Dawson, J.; Fields, T. et al.
Partner: UNT Libraries Government Documents Department

Contained {nu} events observed in Soudan 2

Description: Atmospheric {nu}{sub {mu}} and {nu}{sub e} are created in cosmic ray interactions in the atmosphere, and can be detected in underground detectors. The Kamiokande and IMB water Cerenkov detectors have found fewer {nu}{sub {mu}} interactions (relative to {nu}{sub e}) than are expected. Results are usually expressed by the ratio: R{triple_bond}({nu}{sub {mu}}/{nu}{sub {mu}}) measured |({nu}{sub {mu}}/{nu}{sub e}) predicted with R found to be less than 1. The Soudan 2 detector is an iron calorimeter, which has different systematic effects than the water Cerenkov counters. Results from the Frejus and NUSEX calorimeters do not suggest a deficit of {nu}{sub {mu}}`s in iron, implying that perhaps there is a systematic effect in Cerenkov detectors or some unexpected nuclear effect. Here we report on a preliminary analysis of 0.5 kton-year of data in Soudan 2. We are presently analyzing our second 0.5 kt-year of data, and will present new results at the meeting.
Date: June 1, 1993
Creator: Ambats, I.; Ayres, D. S.; Balka, L.; Barrett, W. L.; Dawson, J.; Fields, T. et al.
Partner: UNT Libraries Government Documents Department