Construction of a new Tevatron collider beam abort dump

Hanna, B.; Crawford, C.

doi:10.1109/pac.1991.164507

Cited by 3 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the authors' knowledge, the only similar beam intercepting device that can be compared with the LHC dump block is the Fermilab Tevatron collider external dump [11,12]. Albeit designed for a lower beam kinetic energy of 3.2 MJ, the device incorporates design features that are also present in the LHC beam dump, such as the requirement of being an external dump (i.e.…”

Section: Jinst 16 P11019mentioning

confidence: 99%

Design and behaviour of the Large Hadron Collider external beam dumps capable of receiving 539 MJ/dump

Maestre¹,

Cabanilles²,

Kershaw³

et al. 2021

J. Inst.

View full text Add to dashboard Cite

Two 6 t beam dumps, made of a graphite core encapsulated in a stainless steel vessel, are used to absorb the energy of the two Large Hadron Collider (LHC) intense proton beams during operation of the accelerator. Operational issues started to appear in 2015 during LHC Run 2 (2014–2018) as a consequence of the progressive increase of the LHC beam kinetic energy, necessitating technical interventions in the highly radioactive areas around the dumps. Nitrogen gas leaks appeared after highly energetic beam impacts and instrumentation measurements indicated an initially unforeseen movement of the dumps. A computer modelling analysis campaign was launched to understand the origin of these issues, including both Monte Carlo simulations to model the proton beam interaction as well as advanced thermo-mechanical analyses. The main ﬁndings were that the amount of instantaneous energy deposited in the dump vessel leads to a strong dynamic response of the whole dump and high accelerations (above 200 g). Based on these ﬁndings, an upgraded design, including a new support system and beam windows, was implemented to ensure the dumps' compatibility with the more intense beams foreseen during LHC Run 3 (2022–2025) of 539 MJ per beam. In this paper an integral overview of the operational behaviour of the dumps and the upgraded configurations are discussed.

show abstract

Section: Jinst 16 P11019mentioning

confidence: 99%

Design and behaviour of the Large Hadron Collider external beam dumps capable of receiving 539 MJ/dump

Maestre¹,

Cabanilles²,

Kershaw³

et al. 2021

J. Inst.

View full text Add to dashboard Cite

show abstract

“…Data on high heat flux components in aerospace applications, such as rocket nozzle cooling, are not easily found and are not very applicable because of differences in coolants, mission lifetime, operating temperatures and pressures, and the absence of significant ionizing radiation exposure in aerospace applications. The only similar application identified thus far is beam stop cooling in particle accelerators, and the aluminum alloys possible for accelerators (see Hanna, 1991) vary from those needed in magnetic fusion. There is little quantitative data found in the literature on these components.…”

Section: Reliability For Tokamak In-vessel Componentsmentioning

confidence: 99%

Qualitative Reliability Issues for Solid and Liquid Wall Fusion Design

Cadwallader¹

2001

View full text Add to dashboard Cite

This report is an initial effort to identify issues affecting reliability and availability of solid and liquid wall designs for magnetic fusion power plant designs. A qualitative approach has been used to identify the possible failure modes of major system components and their effects on the systems. A general set of design attributes known to affect the service reliability has been examined for the overview solid and liquid wall designs, and some specific features of good first wall design have been discussed and applied to these designs as well. The two generalized designs compare well in regard to these design attributes. The strengths and weaknesses of each design approach are seen in the comparison of specific features.iv SUMMARY Some members of the magnetic fusion community have suggested that conventional solid wall armor for magnetic fusion is not reliable enough to make the overall fusion plant economically attractive, and they have suggested design alternatives such as liquid self-renewing walls. Other members of the magnetic fusion community believe that strides have been made in solid walls and are dubious of the technical feasibility of liquid walls. Such feasibility issues may not be overcome even if the overall availability of liquid wall systems were greater than that of conventional solid walls. A quantitative analysis of the availability of these two approaches cannot be performed because there is inadequate design detail at the present time. A preliminary qualitative examination of the reliability issues associated with solid and liquid walls can be useful to help understand the strengths and weaknesses of each approach, and to highlight areas for further study.This report presents a preliminary examination of qualitative reliability issues of solid wall and liquid wall fusion designs. A comparative failure modes and effects analysis (FMEA) approach was used to identify the different reliability issues for the two design concepts. Very generalized designs were used for the evaluation. Using the results of the FMEA method, the following eight issues of importance were identified: coolant pump reliability, vacuum quality, liquid wall nozzle reliability, maintenance downtime issues, responses to loss of vacuum accidents (that is, vacuum component failures), responses to loss of coolant accidents (that is, piping failures), helium pumping ability for vacuum cleanliness, and natural circulation of reactor coolant.

show abstract

“…To our knowledge, the effect of composite microstructure on resulting macroscopic EM properties has been reported for frequencies up to 1 MHz 17, 18. On the other hand, the use of such materials at microwaves, and particularly in the X‐band, is reflected in the variety of engineering applications from synthetic aperture radar for remote sensing,19, 20 compact accelerators for medical applications,21–23 industrial nondestructive testing,24 to television picture transmission, and telephone microwave relay systems 25. Articles that deal with dielectric properties in X‐Band (8.2–12.4 GHz) frequently do not usually relate dispersion with macroscopic dielectric properties or EM performances 26.…”

Section: Introductionmentioning

confidence: 99%

Effect of diblock copolymer surfactant on the microstructure and EM properties of CNT nanocomposites

Travaglia

Nanni

Hojati-Talemi

et al. 2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) were chosen due to their excellent electrical properties. As delivered, CNTs are highly agglomerated, and to exploit their high aspect ratio is then necessary to disagglomerate them as much as possible. A diblock copolymer surfactant was used to aid CNT disagglomeration. Disagglomeration in solvent was assessed by TEM, whereas composite microstructure was observed by scanning electron microscopy. X-band waveguide measurements were carried out to assess complex permittivity and absorbing performance. On a same weight percent of filler basis, samples produced with the aid of surfactant show higher real permittivity than samples produced without. An equivalent circuit analogy is suggested to explain the results and relates composite microstructure with macroscopic permittivit

show abstract

Construction of a new Tevatron collider beam abort dump

Cited by 3 publications

References 1 publication

Design and behaviour of the Large Hadron Collider external beam dumps capable of receiving 539 MJ/dump

Design and behaviour of the Large Hadron Collider external beam dumps capable of receiving 539 MJ/dump

Qualitative Reliability Issues for Solid and Liquid Wall Fusion Design

Effect of diblock copolymer surfactant on the microstructure and EM properties of CNT nanocomposites

Contact Info

Product

Resources

About