K. Sulanke - Academia.edu (original) (raw)

Papers by K. Sulanke

Research paper thumbnail of Progress of the APEmille project

... In this paper, we briefly recall the APEmille *Poster presented by F. Schifano and H. Simma a... more ... In this paper, we briefly recall the APEmille *Poster presented by F. Schifano and H. Simma architecture and describe the current status of the project. ... of the APE processors via the PCI bus for program loading and data I O. The FP processor (J1000) supports norma op erations ...

Research paper thumbnail of A programming environment to control switching networks based on STC104 packet routing chip

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997

The software environment used to control a large switching architecture based on SGS-Thomson STC1... more The software environment used to control a large switching architecture based on SGS-Thomson STC104 (an asynchronous 32-way dynamic packet routing chip) is presented. We are evaluating this switching technology for large scale, real-time parallel systems. A Graphical User Interface (GUI) written as a multi-thread application in Java allows to set the switch con guration and to continuously monitor the state of each link. This GUI connects to a multi-thread server via TCP/IP sockets. The server is running on a PC-Linux system and implements the virtual channel protocol in communicating with the STC104 switching units using the Data Strobe link or the VME bus. Linux I/O drivers to control the Data Strobe link parallel adaptor (STC101) were developed. For each client the server creates a new thread and allocates a new socket for communication. The Java code of the GUI may be transferred to any client using the http protocol providing a user friendly interface to the system with real-time monitoring which is also platform independent.

Research paper thumbnail of Status of APE projects

Nuclear Physics B - Proceedings Supplements, 2001

This talk is divided in two parts. In the first part, we will summarize the status of the APEmill... more This talk is divided in two parts. In the first part, we will summarize the status of the APEmille project that will be completed by the end of the year. We will then devote the rest of the talk to the description of a new project for a multi-TeraFlop machine, apeNEXT. The interested reader will find a much more detailed discussion of all the items touched upon here in the full proposal of the project that will shortly appear on hep-lat.

Research paper thumbnail of ERRATUM: “SEARCH FOR HIGH-ENERGY MUON NEUTRINOS FROM THE “NAKED-EYE” GRB 080319B WITH THE ICECUBE NEUTRINO TELESCOPE” (2009, ApJ, 701, 1721)

The Astrophysical Journal, 2010

Research paper thumbnail of Search for Extraterrestrial Point Sources of Neutrinos with AMANDA-II

Physical Review Letters, 2004

We present the results of a search for point sources of high energy neutrinos in the northern hem... more We present the results of a search for point sources of high energy neutrinos in the northern hemisphere using AMANDA-II data collected in the year 2000. Included are flux limits on several AGN blazars, microquasars, magnetars and other candidate neutrino sources. A search for excesses above a random background of cosmic-ray-induced atmospheric neutrinos and misreconstructed downgoing cosmic-ray muons reveals no statistically significant neutrino point sources. We show that AMANDA-II has achieved the sensitivity required to probe known TeV γ-ray sources such as the blazar Markarian 501 in its 1997 flaring state at a level where neutrino and γ-ray fluxes are equal.

Research paper thumbnail of Limits to the muon flux from WIMP annihilation in the center of the Earth with the AMANDA detector

Physical Review D, 2002

A search for nearly vertical up-going muon-neutrinos from neutralino annihilations in the center ... more A search for nearly vertical up-going muon-neutrinos from neutralino annihilations in the center of the Earth has been performed with the AMANDA-B10 neutrino detector. The data collected in 130.1 days of live-time in 1997, ∼10 9 events, have been analyzed for this search. No excess over the expected atmospheric neutrino background has been observed. An upper limit at 90% confidence level has been obtained on the annihilation rate of neutralinos in the center of the Earth, as well as the corresponding muon flux limit, both as a function of the neutralino mass in the range 100 GeV-5000 GeV. PACS numbers: 95.35.+d, 95.30.Cq, 11.30.Pb I.

Research paper thumbnail of The South Pole Acoustic Test Setup: calibrations and lake test

Journal of Physics: Conference Series, 2007

... The recorded data will reveal the acoustic properties of the ice cap in the 10 kHz to 100 kHz... more ... The recorded data will reveal the acoustic properties of the ice cap in the 10 kHz to 100 kHz frequency range. References [1] Askar'yan GA 1979 Acoustic detection of high energy particle showers in water Nucl. Instr. and Meth. ...

Research paper thumbnail of Status of the South Pole Acoustic Test Setup

Journal of Physics: Conference Series, 2007

ABSTRACT Due to the low flux of ultra-high energetic neutrinos induced in interactions of cosmic ... more ABSTRACT Due to the low flux of ultra-high energetic neutrinos induced in interactions of cosmic rays with the cosmic microwave background, very large instrumented volumes and new registration techniques are necessary for their detection. The south polar ice offers the unique opportunity to implement existing Cherenkov techniques as well as registration of radio and acoustic waves from the neutrino interaction. A simulation of a ~ 120 km3 hybrid optical/radio/acoustic detector showed that event rates of ~ 10 per year can be achieved. In this simulation the ultrasonic parameters of antarctic ice regarding absorption, scattering and environmental noise pose the key uncertainty. To evaluate the acoustic properties in-situ, the South Pole Acoustic Test Setup (SPATS) has been created. An array of custom-made ultrasonic sensors and transmitters will be deployed on three strings in the upper 400 m of the holes of the IceCube experiment. The status of the experiment and a first evaluation of its performance are presented here.

Research paper thumbnail of Higher level trigger systems for the HERA-B experiment

IEEE Transactions on Nuclear Science, 1998

The HERA-B experiment is designed for observation of CP violation in the B-meson system at the HE... more The HERA-B experiment is designed for observation of CP violation in the B-meson system at the HERA machine in DESY. The data acquisition and triggering system must cope with a half million detector channels, a 40 MHz interaction rate and a signal to background ratio of 10 ?10 . A highly selective multi-level trigger and high bandwidth data acquisition system has been designed and is currently being implemented.

Research paper thumbnail of Determination of the atmospheric neutrino flux and searches for new physics with AMANDA-II

Physical Review D, 2009

The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has ac... more The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has accumulated a large sample of atmospheric muon neutrinos in the 100 GeV to 10 TeV energy range. The zenith angle and energy distribution of these events can be used to search for various phenomenological signatures of quantum gravity in the neutrino sector, such as violation of Lorentz invariance (VLI) or quantum decoherence (QD). Analyzing a set of 5511 candidate neutrino events collected during 1387 days of livetime from 2000 to 2006, we find no evidence for such effects and set upper limits on VLI and QD parameters using a maximum likelihood method. Given the absence of evidence for new flavor-changing physics, we use the same methodology to determine the conventional atmospheric muon neutrino flux above 100 GeV.

Research paper thumbnail of Progress of the APEmille project

... In this paper, we briefly recall the APEmille *Poster presented by F. Schifano and H. Simma a... more ... In this paper, we briefly recall the APEmille *Poster presented by F. Schifano and H. Simma architecture and describe the current status of the project. ... of the APE processors via the PCI bus for program loading and data I O. The FP processor (J1000) supports norma op erations ...

Research paper thumbnail of A programming environment to control switching networks based on STC104 packet routing chip

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997

The software environment used to control a large switching architecture based on SGS-Thomson STC1... more The software environment used to control a large switching architecture based on SGS-Thomson STC104 (an asynchronous 32-way dynamic packet routing chip) is presented. We are evaluating this switching technology for large scale, real-time parallel systems. A Graphical User Interface (GUI) written as a multi-thread application in Java allows to set the switch con guration and to continuously monitor the state of each link. This GUI connects to a multi-thread server via TCP/IP sockets. The server is running on a PC-Linux system and implements the virtual channel protocol in communicating with the STC104 switching units using the Data Strobe link or the VME bus. Linux I/O drivers to control the Data Strobe link parallel adaptor (STC101) were developed. For each client the server creates a new thread and allocates a new socket for communication. The Java code of the GUI may be transferred to any client using the http protocol providing a user friendly interface to the system with real-time monitoring which is also platform independent.

Research paper thumbnail of Status of APE projects

Nuclear Physics B - Proceedings Supplements, 2001

This talk is divided in two parts. In the first part, we will summarize the status of the APEmill... more This talk is divided in two parts. In the first part, we will summarize the status of the APEmille project that will be completed by the end of the year. We will then devote the rest of the talk to the description of a new project for a multi-TeraFlop machine, apeNEXT. The interested reader will find a much more detailed discussion of all the items touched upon here in the full proposal of the project that will shortly appear on hep-lat.

Research paper thumbnail of ERRATUM: “SEARCH FOR HIGH-ENERGY MUON NEUTRINOS FROM THE “NAKED-EYE” GRB 080319B WITH THE ICECUBE NEUTRINO TELESCOPE” (2009, ApJ, 701, 1721)

The Astrophysical Journal, 2010

Research paper thumbnail of Search for Extraterrestrial Point Sources of Neutrinos with AMANDA-II

Physical Review Letters, 2004

We present the results of a search for point sources of high energy neutrinos in the northern hem... more We present the results of a search for point sources of high energy neutrinos in the northern hemisphere using AMANDA-II data collected in the year 2000. Included are flux limits on several AGN blazars, microquasars, magnetars and other candidate neutrino sources. A search for excesses above a random background of cosmic-ray-induced atmospheric neutrinos and misreconstructed downgoing cosmic-ray muons reveals no statistically significant neutrino point sources. We show that AMANDA-II has achieved the sensitivity required to probe known TeV γ-ray sources such as the blazar Markarian 501 in its 1997 flaring state at a level where neutrino and γ-ray fluxes are equal.

Research paper thumbnail of Limits to the muon flux from WIMP annihilation in the center of the Earth with the AMANDA detector

Physical Review D, 2002

A search for nearly vertical up-going muon-neutrinos from neutralino annihilations in the center ... more A search for nearly vertical up-going muon-neutrinos from neutralino annihilations in the center of the Earth has been performed with the AMANDA-B10 neutrino detector. The data collected in 130.1 days of live-time in 1997, ∼10 9 events, have been analyzed for this search. No excess over the expected atmospheric neutrino background has been observed. An upper limit at 90% confidence level has been obtained on the annihilation rate of neutralinos in the center of the Earth, as well as the corresponding muon flux limit, both as a function of the neutralino mass in the range 100 GeV-5000 GeV. PACS numbers: 95.35.+d, 95.30.Cq, 11.30.Pb I.

Research paper thumbnail of The South Pole Acoustic Test Setup: calibrations and lake test

Journal of Physics: Conference Series, 2007

... The recorded data will reveal the acoustic properties of the ice cap in the 10 kHz to 100 kHz... more ... The recorded data will reveal the acoustic properties of the ice cap in the 10 kHz to 100 kHz frequency range. References [1] Askar'yan GA 1979 Acoustic detection of high energy particle showers in water Nucl. Instr. and Meth. ...

Research paper thumbnail of Status of the South Pole Acoustic Test Setup

Journal of Physics: Conference Series, 2007

ABSTRACT Due to the low flux of ultra-high energetic neutrinos induced in interactions of cosmic ... more ABSTRACT Due to the low flux of ultra-high energetic neutrinos induced in interactions of cosmic rays with the cosmic microwave background, very large instrumented volumes and new registration techniques are necessary for their detection. The south polar ice offers the unique opportunity to implement existing Cherenkov techniques as well as registration of radio and acoustic waves from the neutrino interaction. A simulation of a ~ 120 km3 hybrid optical/radio/acoustic detector showed that event rates of ~ 10 per year can be achieved. In this simulation the ultrasonic parameters of antarctic ice regarding absorption, scattering and environmental noise pose the key uncertainty. To evaluate the acoustic properties in-situ, the South Pole Acoustic Test Setup (SPATS) has been created. An array of custom-made ultrasonic sensors and transmitters will be deployed on three strings in the upper 400 m of the holes of the IceCube experiment. The status of the experiment and a first evaluation of its performance are presented here.

Research paper thumbnail of Higher level trigger systems for the HERA-B experiment

IEEE Transactions on Nuclear Science, 1998

The HERA-B experiment is designed for observation of CP violation in the B-meson system at the HE... more The HERA-B experiment is designed for observation of CP violation in the B-meson system at the HERA machine in DESY. The data acquisition and triggering system must cope with a half million detector channels, a 40 MHz interaction rate and a signal to background ratio of 10 ?10 . A highly selective multi-level trigger and high bandwidth data acquisition system has been designed and is currently being implemented.

Research paper thumbnail of Determination of the atmospheric neutrino flux and searches for new physics with AMANDA-II

Physical Review D, 2009

The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has ac... more The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has accumulated a large sample of atmospheric muon neutrinos in the 100 GeV to 10 TeV energy range. The zenith angle and energy distribution of these events can be used to search for various phenomenological signatures of quantum gravity in the neutrino sector, such as violation of Lorentz invariance (VLI) or quantum decoherence (QD). Analyzing a set of 5511 candidate neutrino events collected during 1387 days of livetime from 2000 to 2006, we find no evidence for such effects and set upper limits on VLI and QD parameters using a maximum likelihood method. Given the absence of evidence for new flavor-changing physics, we use the same methodology to determine the conventional atmospheric muon neutrino flux above 100 GeV.