Monte Carlo simulation of gas flow through the KATRIN DPS2-F differential pumping system

Luo, Xueli; Day, Christian; Hauer, V.; Malyshev, O.B.; Reid, RJ; Sharipov, Felix

doi:10.1016/j.vacuum.2005.11.044

Cited by 22 publications

(20 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initial design value was estimated independently by calculation of conductances [5], and by molecular-flow simulations equivalent to those used in this work [1,6].…”

Section: Resultsmentioning

confidence: 99%

“…These two considerations can be expressed as differences in the capture factors at the respective boundary surfaces of the DPS2-F. To determine the influence of the capture factors, α 2800 T MP of the MAG W2800 TMP and α out at the DPS2-F outlet, on the measured gas-flow reduction factor, the modified flow-matrix method described by X. Luo et al in Ref. [6] was applied. In this method, matrix inversion technique is used in a similar way as in the well known view-factor method of solving stationary molecular flows, but with the difference that the transmission probabilities are considered not between all surface elements of the system, but only between the boundary surfaces, through which molecules can enter and/or leave the system, i.e.…”

Section: Molecular Flow Simulations and The Analysis Of The Measmentioning

confidence: 99%

“…The retention capability is customarily expressed in terms of the gas-flow reduction factor, defined as the ratio of the gas-flow at the DPS2-F inlet to that at its outlet. The reduction factor has been extensively studied in the design phase by calculation and gas-flow simulation [4][5][6]. Results of these estimates depend strongly on the input parameters regarding the DPS2-F geometry and on the boundary conditions that were not all precisely known at that time.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, deuterium, helium, neon, argon and krypton were used instead, as test gases. As shown in [6], the reduction factor of the DPS2-F depends on the capture factor at each of the flanges connecting the TMP, which in turn depends on the molecular mass of the gas in question [7]. The capture factor at a given boundary surface is defined as the ratio of the number of molecules pumped at the surface to the number of molecules impinging on the surface in the same time interval.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Measurement of the gas-flow reduction factor of the KATRIN DPS2-F differential pumping section

Lukić

Bornschein

et al. 2012

Vacuum

View full text Add to dashboard Cite

The gas-flow reduction factor of the second forward Differential Pumping Section (DPS2-F) for the KATRIN experiment was determined using a dedicated vacuum-measurement setup and by detailed molecular-flow simulation of the DPS2-F beam tube and of the measurement apparatus. In the measurement, non-radioactive test gases deuterium, helium, neon, argon and krypton were used, the input gas flow was provided by a commercial mass-flow controller, and the output flow was measured using a residual gas analyzer, in order to distinguish it from the outgassing background. The measured reduction factor with the empty beam tube at room temperature for gases with mass 4 is 1.8(4) × 10 4 , which is in excellent agreement with the simulated value of 1.6 × 10 4 . The simulated reduction factor for tritium, based on the interpolated value for the capture factor at the turbo-molecular pump inlet flange is 2.5 × 10 4 . The difference with respect to the design value of 1 × 10 5 is due to the modifications in the beam tube geometry since the initial design, and can be partly recovered by reduction of the effective beam tube diameter.

show abstract

“…The initial design value was estimated independently by calculation of conductances [5], and by molecular-flow simulations equivalent to those used in this work [1,6].…”

Section: Resultsmentioning

confidence: 99%

Section: Molecular Flow Simulations and The Analysis Of The Measmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measurement of the gas-flow reduction factor of the KATRIN DPS2-F differential pumping section

Lukić

Bornschein

et al. 2012

Vacuum

View full text Add to dashboard Cite

show abstract

“…The first part of the tritium flow suppression is based on differential pumping [9], [10], [11]. Along the beam-line turbo-molecular pumps with high pumping speed reduce the tritium flow both at the rear and front ends of the source.…”

Section: Tritium Pumping Systemmentioning

confidence: 99%

The KATRIN neutrino mass experiment

Wolf

2010

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

The Karlsruhe Tritium Neutrino experiment (KATRIN) aims to measure the mass of electron neutrinos from betadecay of tritium with an unprecedented sensitivity of 0.2 eV /c 2 improving present limits by one order of magnitude. The decay electrons will originate from a 10 m long windowless, gaseous tritium source. Super-conducting magnets guide the electrons through differential and cryogenic pumping sections to the electro-static tandem spectrometer (MAC-E-filter), where the kinetic energy will be measured. The experiment is presently being built at the Forschungszentrum Karlsruhe by an international collaboration of more than 120 scientists. The largest component, the 1240 m 3 main spectrometer, was delivered end of 2006 and first commissioning tests have been performed. This presentation describes the goals and technological challenges of the experiment and reports on the progress in commissioning first major components. The start of first measurements is expected in 2012.

show abstract

Vacuum System Modelling

Malyshev

2019

Vacuum in Particle Accelerators

View full text Add to dashboard Cite

Monte Carlo simulation of gas flow through the KATRIN DPS2-F differential pumping system

Cited by 22 publications

References 6 publications

Measurement of the gas-flow reduction factor of the KATRIN DPS2-F differential pumping section

Measurement of the gas-flow reduction factor of the KATRIN DPS2-F differential pumping section

The KATRIN neutrino mass experiment

Vacuum System Modelling

Contact Info

Product

Resources

About