Gas mixing effect on Kr ion currents from an ECR ion source

Mandal, A.; Tribedi, Lokesh C.

doi:10.1016/j.nimb.2018.11.035

Cited by 12 publications

(36 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The present experiment was performed at TIFR, Mumbai, using ECR (Electron Cyclotron Resonance) ion-source based low energy ion accelerator [10,11,12]. An implanted 14 N target previously characterized [13] was bombarded by proton beam at lab energy E lab p = 278 keV.…”

Section: Experimental Set Up Detectors Data Acquisition and Analysismentioning

confidence: 99%

Characterization of an electrically cooled BEGe detector till Eγ∼7 MeV

Sharma

Gupta

Dey

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

Section: Experimental Set Up Detectors Data Acquisition and Analysismentioning

confidence: 99%

Characterization of an electrically cooled BEGe detector till Eγ∼7 MeV

Sharma

Gupta

Dey

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

“…The C, N, O, or F nuclei act only as catalysts, as their total abundances are not altered while only the hydrogen is consumed. Due to the highest Coulomb barrier (∼ 2460 keV) of the 14 N(p,γ) 15 O reaction, it is the slowest reaction or the bottleneck of the CNO cycle I. So, this reaction plays a vital role in the stellar energy production and the reaction rate determination.…”

Section: Introductionmentioning

confidence: 99%

“…The globular clusters provide a strict constraint for the stellar models [1] because of their distinct features in the Hertzsprung Russell [H-R] diagram. The age of the globular cluster can be determined from the main sequence (MS) turn off point, which is related to the 14 N(p,γ) 15 O reaction rate. The lower limit of the age of the universe is also estimated from the globular cluster age determination [2].…”

Section: Introductionmentioning

confidence: 99%

“…The lower limit of the age of the universe is also estimated from the globular cluster age determination [2]. There are many other implications of the 14 N(p,γ) 15 O reaction which are discussed elaborately in Refs. [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…

The slowest reaction in the CNO cycle 14 N(p,γ) 15 O has been studied by populating the E lab p =278 keV (E r c.m. =259 keV) proton capture resonant state of 15 O at 7556 keV.

…”

mentioning

confidence: 99%

See 2 more Smart Citations

Study of proton capture resonant state of ^{15}O at 7556 keV

Sharma,

Gupta,

Chowdhury

et al. 2020

Preprint

View full text Add to dashboard Cite

The slowest reaction in the CNO cycle 14 N(p,γ) 15 O has been studied by populating the E lab p =278 keV (E r c.m. =259 keV) proton capture resonant state of 15 O at 7556 keV. The strength of the resonance (ωγ) has been determined from the experimental data. The level lifetime of the sub-threshold resonant state at Ex=6792 keV, as well as the lifetimes of the 5181 keV and 6172 keV states, have been measured using the Doppler shift attenuation method (DSAM). The structural properties of the nucleus 15 O, such as, the level energies, transition strengths, level lifetimes, and spectroscopic factors, have been calculated theoretically by using the large basis shell model, which agrees reasonably well with the present as well as the previous experimental data.

show abstract

Studies of pure and nitrogen gas mixed xenon ECR plasma: Signature of abundance dependent unusual trends in isotope anomaly

2022

View full text Add to dashboard Cite

We report the effect of N 2 gas-mixing in the xenon electron cyclotron resonance (ECR) plasma, and abundance-dependent novel, exciting and unusual trends of the isotope anomaly. The xenon plasma was produced using a 10 GHz all-permanentmagnet NANOGAN ECR ion source, and the charge state distributions of naturally abundant six stable xenon isotopes with and without N 2 gas-mixing (at 25%, 50%, and 75%) were recorded. The intensity ratio of the heavier to lighter isotope, where the heavier isotope is less abundant, showed a clear signature of the isotope anomaly as explained by the linear Landau wave damping theory. Contrary to the theoretical prediction that the isotope anomaly should vanish with a relatively large fraction of the heavier isotope in mixed plasmas, the trends of intensity ratios observed in such cases are very unusual and have almost the mirror-symmetrical shapes of those trends recorded with less abundant heavier isotope. Further, the effect of relative mass difference on the isotope anomaly was also evidenced. The N 2 gas-mixing of the xenon plasma at 25% and 50% shifted the entire charge state distribution toward the higher intensity side owing to the supply of additional electrons that caused high ionization efficiency. However, a prominent gas-mixing effect was observed at 75% of N 2 mixing in the xenon plasma beyond the +7 charge state. The abundancedependent unusual trends in isotope anomaly have been explained by considering different ionic temperatures, ion heating by the wave damping, and Coulomb scattering in the core of the plasma.charge state distribution, electron cyclotron resonance (ECR) plasma, gas mixing effect, isotope anomaly, low energy accelerator, mass analyzer | INTRODUCTIONThe capability of producing multiply charged positive ions via the electron-impact ionization without using any cathode/filament made the electron cyclotron resonance ion sources (ECRIS) very popular among the accelerator physicists. [1][2][3][4][5][6][7] The intensities in ECRIS are mainly governed by the ion-confinement using the magnetic fields. In a typical structure, multipole permanent magnets are used for the radial confinement of the ions, whereas the axial confinement of the ions is achieved either by the permanent magnets or the electromagnets. 8,9 The fourth generation high-frequency ECRIS utilized superconducting magnetic coils for the axial confinement of the ions. [10][11][12] The resonant electrons, which have a gyration frequency equals to the frequency of the input electromagnetic wave, gain enough kinetic energy to ionize the gaseous atom/molecules and yield intense plasma. 13

show abstract

Gas mixing effect on Kr ion currents from an ECR ion source

Cited by 12 publications

References 14 publications

Characterization of an electrically cooled BEGe detector till Eγ∼7 MeV

Characterization of an electrically cooled BEGe detector till Eγ∼7 MeV

Study of proton capture resonant state of ^{15}O at 7556 keV

Studies of pure and nitrogen gas mixed xenon ECR plasma: Signature of abundance dependent unusual trends in isotope anomaly

Contact Info

Product

Resources

About