14 Matching Results

Search Results

Advanced search parameters have been applied.

Pressure recovery in a cylindrical heat pipe at high radial Reynolds numbers and at high Mach numbers

Description: The pressure recovery in a cylindrical heat pipe has been investigated. The experiments cover average radial Reynolds numbers between 5 and 150 and average Mach numbers up to the velocity of sound. During preliminary experiments in a cylindrical, gravity-assisted heat pipe at high Mach numbers large condensate flow instabilities were observed. As a consequence the heat pipe power varied strongly. Based on these observations an improved heat pipe design was made that resulted in steady operating conditions throughout the entire parameter range. This heat pipe is described. The pressure recovery was measured and compared with results from a two-dimensional analytical model for describing compressible vapor flow in heat pipes. Good agreement with the experimental data was found.
Date: January 1, 1985
Creator: Haug, F. & Busse, C.A.
Partner: UNT Libraries Government Documents Department

Measurement of performance limits in cryogenic heat pipes

Description: This paper describes the results of an experimental study designed to investigate the fabrication and operation of gravity-assist cryogenic heat pipes. Two heat pipes were built, the first having no formal wick but a roughened internal surface, the second having spiral grooves machined with a specially developed tool. The wall material of the heat pipes was brass and hydrogen was used as the working fluid. The wicked heat pipe became operational over the entire temperature range from the triple-point to the critical point. The performance limitation depended on the operating temperature and the tilt angle. Axial heat flux densities of up to 50W/cm/sup 2/ were obtained. 15 refs., 9 figs.
Date: January 1, 1986
Creator: Haug, F.; Prenger, F.C. & Chrisman, R.H.
Partner: UNT Libraries Government Documents Department

A 15-T Pulsed Solenoid for a High-Power Target Experiment

Description: The MERIT experiment, which ran at CERN in 2007, is a proof-of-principle test for a target system that converts a 4-MW proton beam into a high-intensity muon beam for either a neutrino factory complex or a muon collider. The target system is based on a free mercury jet that intercepts an intense proton beam inside a 15-T solenoidal magnetic field. Here, we describe the design and performance of the 15-T, liquid-nitrogen-precooled, copper solenoid magnet.
Date: June 23, 2008
Creator: Kirk,H.G.; Efthymiopoulos, I.; Fabich, A.; Haug, F.; Pereira, H.; Titus, P. et al.
Partner: UNT Libraries Government Documents Department

The MERIT(nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS

Description: The MERIT(nTOF-11) experiment is a proof-of-principle test of a target system for a high power proton beam to be used as front-end for a neutrino factory or a muon collider. The experiment took data in autumn 2007 with the fast-extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of 30 x 10{sup 12} per pulse. The target system, based on a free mercury jet, is capable of intercepting a 4-MW proton beam inside a 15-T magnetic field required to capture the low energy secondary pions as the source for intense muon beams. Particle detectors installed around the target setup measure the secondary particle flux out of the target and can probe cavitation effects in the mercury jet when excited by an intense proton beam. Preliminary results of the data analysis will be presented here.
Date: June 1, 2008
Creator: Efthymiopoulos, I.; Fabich, A.; Palm, M.; Lettry, J.; Haug, F.; Pernegger, H. et al.
Partner: UNT Libraries Government Documents Department

The MERIT High-Power Target Experiment at the CERN PS

Description: The MERIT experiment was designed as a proof-of-principle test of a target system based on a free mercury jet inside a 15-T solenoid that is capable of sustaining proton beam powers of up to 4 MW. The experiment was run at CERN in the fall of 2007. We describe the results of the tests and their implications.
Date: June 1, 2008
Creator: Kirk, H.G.; Tsang, T.; /Brookhaven; Efthymiopoulos, I.; Fabich, A.; Haug, F. et al.
Partner: UNT Libraries Government Documents Department

A high-power target experiment at the CERN PS

Description: We test a target concept devised for the purpose of producing copious secondary pions and capturing the muon decay products. This experiment is designed to test the target system for a neutrino factory or muon collider and consists of a free flowing mercury stream embedded in a high-field solenoid. Key components are described.
Date: June 1, 2007
Creator: Kirk, H.G.; Park, H.J.; Tsang, T.; /Brookhaven; Fabich, A.; Efthymiopoulos, I. et al.
Partner: UNT Libraries Government Documents Department

A Proof-of-Principal Experiment for a High-Power Target System

Description: The MERIT experiment, to be run at CERN in 2007, is a proof-of-principle test for a target system that converts a 4-MW proton beam into a high-intensity muon beam for either a neutrino factory complex or a muon collider. The target system is based on a free mercury jet that intercepts an intense proton beam inside a 15-T solenoidal magnetic field. A muon collider or neutrino factory requires intense beams of muons, which are obtained from the decay of pions. Pion production by a proton beam is maximized by use of a high-Z target such as mercury. A liquid jet target has the advantages over a solid target that a flowing jet can readily remove heat and that it is immune to radiation damage. However the proton beam energy disrupts the jet and the system could be operationally unstable. Efficient capture of low-energy secondary pions (for transfer into the subsequent muon accelerator complex) requires that the target system be immersed in a strong magnetic field of solenoidal geometry. This magnetic field should stabilize the mercury flow in regions of nearly uniform field, but it perturbs the liquid metal jet as it enters the field. Hence, the behavior of the mercury jet plus an intense proton beam inside a strong magnetic field needs to be understood better before resources are committed to a larger facility. The MERIT experiment is to be conducted at CERN in 2007 for this purpose.
Date: June 26, 2006
Creator: Kirk,H.G.; Samulyak, R.; Simos, N.; Tsang, T.; Efthymiopoulos, I.; Fabich, A. et al.
Partner: UNT Libraries Government Documents Department

The MERIT (nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS

Description: The MERIT(nTOF-11) experiment is a proof-of-principle test of a target system for a high power proton beam to be used as front-end for a neutrino factory or a muon collider. The experiment took data in autumn 2007 with the fast-extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of 30 x 10{sup 12} per pulse. The target system, based on a free mercury jet, is capable of intercepting a 4-MW proton beam inside a 15-T magnetic field required to capture the low energy secondary pions as the source for intense muon beams. Particle detectors installed around the target setup measure the secondary particle flux out of the target and can probe cavitation effects in the mercury jet when excited by an intense proton beam.Preliminary results of the data analysis will be presented here.
Date: June 1, 2008
Creator: Efthymiopoulos, Ilias; Fabich, A.; Grudiev, A.; Haug, F.; Lettry, J.; Palm, M. et al.
Partner: UNT Libraries Government Documents Department

Time Structure of Particle Production in the MERIT High-Power Target Experiment

Description: The MERIT experiment is a proof-of-principle test of a target system for high power proton beam to be used as front-end for a neutrino factory complex or amuon collider. The experiment took data in autumn 2007 with the fast extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of about 30 x 10{sup 12} protons per pulse. We report results from the portion of the MERIT experiment in which separated beam pulses were delivered to a free mercury jet target with time intervals between pulses varying from 2 to 700 {micro}s. The analysis is based on the responses of particle detectors placed along side and downstream of the target.
Date: May 1, 2009
Creator: Efthymiopoulos, I.; Fabich, A.; Palm, M.; Lettry, J.; Haug, F.; Pereira, H. et al.
Partner: UNT Libraries Government Documents Department

The MERIT High-Power Target Experiment at the CERN PS

Description: The MERIT experiment was designed as a proof-of-principle test of a target system based on a free mercury jet inside a 15-T solenoid that is capable of sustaining proton beam powers of up to 4 MW. The experiment was run at CERN in the fall of 2007. We describe the results of the tests and their implications.
Date: May 1, 2009
Creator: McDonald, K.T.; U., /Princeton; Kirk, H.G.; Park, H.; Tsang, T.; /Brookhaven et al.
Partner: UNT Libraries Government Documents Department

The MERIT High-Power Target Experiment at the CERN PS.

Description: The MERIT experiment was designed as a proof-of-principle test of a target system based on a free mercury jet inside a 15-T solenoid that is capable of sustaining proton beam powers of up to 4 MW. The experiment was run at CERN in the fall of 2007. We describe the results of the tests and their implications. Plans are being discussed for possible future machines which can deliver proton beams with multi-MW beam powers. A prominent application for these powerful beams will be to produce intense secondary beams suitable for investigating important physics issues. Examples include investigations of rare decay processes and neutrino oscillations. The Neutrino Factory and Muon Collider Collaboration [1] has proposed a target system [2, 3] which will be capable of supporting proton beam powers of 4 MW with the purpose of producing and collecting intense muon beams for eventual use in storage rings. The core of this proposed target system consists of a high-Z, free-flowing liquid mercury jet which intercepts the proton beam within the confines of a high-field (15-20 T) solenoid. An important attribute of this system is that the liquid jet target can be replaced for subsequent proton pulses. The experiment described in this paper was designed to provide a proof-of-principle demonstration of this concept. Preparations for this experiment have been previously reported [4].
Date: June 23, 2008
Creator: Kirk,H.G.; Tsang, T.; Efthymiopoulos, I.; Fabich, A.; Haug, F.; Lettry, J. et al.
Partner: UNT Libraries Government Documents Department

The MERIT(nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS

Description: The MERIT(nTOF-11) experiment is a proof-of-principle test of a target system for a high power proton beam to be used as front-end for a neutrino factory or a muon collider. The experiment took data in autumn 2007 with the fast-extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of 30 x 10{sup 12} per pulse. The target system, based on a free mercury jet, is capable of intercepting a 4-MW proton beam inside a 15-T magnetic field required to capture the low energy secondary pions as the source for intense muon beams. Particle detectors installed around the target setup measure the secondary particle flux out of the target and can probe cavitation effects in the mercury jet when excited by an intense proton beam.Preliminary results of the data analysis will be presented here.
Date: June 23, 2008
Creator: Ethymiopoulos,I.; Fabich, A.; Palm, M.; Lettry, J.; Haug, F.; Pernegger, H. et al.
Partner: UNT Libraries Government Documents Department

The MERIT High-Power Target Experiment at the CERN PS

Description: We report on the analysis of data collected in the MERIT experiment at CERN during the Fall of 2007. These results validate the concept of a free mercury jet inside a high-field solenoid magnet as a target for a pulsed proton beam of 4-MW power, as needed for a future Muon Collider and/or Neutrino Factory.
Date: May 1, 2010
Creator: McDonald, K.T.; U., /Princeton; Kirk, H.G.; Park, H.; Tsang, T.; /Brookhaven et al.
Partner: UNT Libraries Government Documents Department