Publisher's Note: Enhanced atom transfer in a double magneto-optical trap setup [Phys. Rev. A<b>77</b>, 065402 (2008)]

Mishra, S. R.; Ram, S. P.; Tiwari, Sanjiv K.; Mehendale, S. C.

doi:10.1103/physreva.77.069904

Cited by 3 publications

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“…Mishra et. al had proposed looking for suppression of small n modes due to an acoustic horizon in heavy-ion collisions [3], but we see is clearly a suppression of large n modes. We argue that this is because viscosity is far more important in heavy-ion collisions than in the early universe [19].…”

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“…Learning about the early stages of the matter produced in heavy-ion collisions from the observation of hadrons in the final state is in some sense similar to understanding the stages of the early universe from the observation of the Cosmic Microwave Background (CMB) [2]. In this talk we explore the analogy between heavy-ion collisions and Big Bang cosmology [3]. In particular, we present the heavyion equivalent of the CMB and from that we determine the power-spectrum for the little bangs.…”

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“…between the expansion of heavy-ion collisions starting from a lumpy initial energy density and the expansion of the universe starting with quantum fluctuations stretched to cosmological sizes, and based on that analogy suggested measuring RMS values of the Fourier coefficients v n (known as flow coefficients) as the power-spectrum [3]. They didn't, however, make a connection between the RMS of v n and the already existing two-particle correlation measurements.…”

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Analyzing the Power Spectrum of the Little Bangs

Mócsy¹,

Sorensen²

2011

Nuclear Physics A

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In this talk we discuss the analogy between data from heavy-ion collisions and the Cosmic Microwave Background. We identify p T correlations data as the heavy-ion analogy to the CMB and extract a power-spectrum from the heavy-ion data. We define the ratio of the final state power-spectrum to the initial coordinate-space eccentricity as the transfer-function. From the transfer-function we find that higher n terms are suppressed and we argue that the suppression provides information on length scales like the mean-free-path. We make a rough estimate of the mean-free-path and find that it is larger than estimates based on the centrality dependence of v 2 .Keywords: Quark-gluon plasma, correlations, fluctuations A commonly quoted goal of the heavy-ion programs at Brookhaven National Laboratory and CERN is to recreate conditions similar to those shortly after the Big Bang [1]. Learning about the early stages of the matter produced in heavy-ion collisions from the observation of hadrons in the final state is in some sense similar to understanding the stages of the early universe from the observation of the Cosmic Microwave Background (CMB) [2]. In this talk we explore the analogy between heavy-ion collisions and Big Bang cosmology [3]. In particular, we present the heavyion equivalent of the CMB and from that we determine the power-spectrum for the little bangs. We then estimate the transfer-function necessary to produce the spectrum from the initial conditions of the collisions.Quantum fluctuations from the early universe show up as hotspots at the surface of last scattering, creating the CMB measured for example by WMAP. Measurements of the CMB reveal temperature fluctuations corresponding to over-or under-densities present at the surface of last scattering at about 400,000 years after the Big Bang [2]. These density fluctuations ultimately explain the structure in our universe. Maps of the temperature of the CMB are determined from measurements of the blackbody spectra at 2M points in the sky. The temperature is found to be very smooth with relative variations only showing up at approximately 10 −5 . The fluctuations tend to only be at short distances; small lumps not large ones. This result has been explained by an inflationary period when the larger scale fluctuations were pushed outside of the horizon, causally separating them.The scale of the correlations can be most easily studied by extracting a power-spectrum from the CMB. The power-spectrum shows that most power is for large wave-numbers (meaning small wavelength). The lack of power at small wave-number is strong evidence of inflation. Peaks in the power-spectrum are caused by acoustic phenomena in the early universe as density perturbations in the universe propagate as sound waves. This gives rise to the structure in the anisotropies of the microwave background, notably a characteristic angular scale and the famous acoustic peaks. From this spectrum the acoustic peaks are fit with models to extract cosmological parameters. In this talk we explore an...

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Analyzing the Power Spectrum of the Little Bangs

Mócsy¹,

Sorensen²

2011

Nuclear Physics A

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“…The experiments have been performed on a double magneto-optical trap (double-MOT) setup [24][25][26] in which a vapour chamber MOT (VC-MOT) of 87 Rb atoms is formed in a chamber at pressure of ∼ 1×10 −8 mbar and an ultra-high vacuum MOT (UHV-MOT) is formed in a glass cell at pressure of ∼ 5×10 −11 mbar . The schematic of the setup is shown in Fig.…”

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confidence: 99%

A toroidal trap for cold ${}^{87}{Rb}$ atoms using an rf-dressed quadrupole trap

Chakraborty

Mishra

Ram

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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We demonstrate the trapping of cold 87 Rb atoms in a toroidal geometry using a rf-dressed quadrupole magnetic trap formed by superposing a strong radio frequency (rf) field on a quadrupole trap. This rf-dressed quadrupole trap has minimum of the potential away from the quadrupole trap centre on a circular path which facilitates the trapping in the toroidal geometry. In the experiments, the laser cooled atoms were first trapped in the quadrupole trap, then cooled evaporatively using a weak rf-field, and finally trapped in the rf-dressed quadrupole trap. The radius of the toroid could be varied by varying the frequency of the dressing rf-field. It has also been demonstrated that a single rf source and an antenna can be used for the rf-evaporative cooling as well as for rf-dressing of atoms. The atoms trapped in the toroidal trap may have applications in realization of an atom gyroscope as well as in studying the quantum gases in low dimensions.

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“…Efficient transfer of atoms from VC-MOT to UHV-MOT is clearly of prime importance in the double-MOT systems. Use of various auxilary techniques (such as use of guiding magnetic field [2], two-dimensional cooling [7], a guiding laser beam [9] and a hollow laser beam [10] during the atom transfer) along with a push beam have been reported to enhance transfer efficiency. Among early experiments on transfer, Cacciapuoti et al [8] used a focused continuous wave (CW) push beam to create an extraction column in VC-MOT to obtain a continuous transfer between two magneto-optical traps (MOTs).…”

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A Comparison of Pulsed and Continuous Atom Transfer between Two Magneto-optical Traps

Ram¹,

Tiwari²,

Mishra³

2010

J. Korean Phy. Soc.

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In our double magneto-optical trap (MOT) setup containing a vapor chamber MOT (VC-MOT) and an ultra high vacuum MOT (UHV-MOT) for 87 Rb atoms, we find that transfer of atoms from VC-MOT to UHV-MOT can be enhanced by employing a pulsed VC-MOT loading followed by a pulsed push beam, as compared to that obtained by focusing a continuous wave (CW) push beam on a continuously loaded VC-MOT. By choosing appropriately the VC-MOT duration and push beam duration, the number of atoms in UHV-MOT was ∼3-times the number obtained with a continuous VC-MOT and a CW push beam of optimized power. The processes affecting the pulsed transfer have been studied.

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Publisher's Note: Enhanced atom transfer in a double magneto-optical trap setup [Phys. Rev. A77, 065402 (2008)]

Cited by 3 publications

References 0 publications

Analyzing the Power Spectrum of the Little Bangs

Analyzing the Power Spectrum of the Little Bangs

A toroidal trap for cold ${}^{87}{Rb}$ atoms using an rf-dressed quadrupole trap

A Comparison of Pulsed and Continuous Atom Transfer between Two Magneto-optical Traps

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