Ranging and phase measurement for LISA

Esteban, Juan José; Díaz, Antonio; Eichholz, J.; Peinado, Antonio M.; Bykov, Iouri; Heinzel, Gerhard; Danzmann, K.

doi:10.1088/1742-6596/228/1/012045

Cited by 16 publications

(14 citation statements)

References 3 publications

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“…The existence and origin of the temperature fluctuations is controversial because high values of the t 2 parameter are not reproduced by standard photoionization models (Kingdon & Ferland 1995;Rodríguez & García-Rojas 2010). Additional mechanisms are proposed in order to explain the presence of temperature fluctuations (see revisions of Esteban 2002;). In the same way, new scenarios are used to try to find a solution to the AD problem in H II regions, putting forward new physical mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Small-spatial-scale variations of nebular properties and the abundance discrepancy in three Galactic H ii regions★

Mesa‐Delgado¹,

Esteban²

2010

Monthly Notices of the Royal Astronomical Society

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We present the results of long‐slit spectroscopy in several slit positions that cover different morphological structures of the central parts of three bright Galactic H ii regions: M8, M17 and NGC 7635. We study the spatial distributions of a large number of nebular parameters, such as the extinction coefficient, line fluxes, physical conditions and ionic abundances at the maximum spatial resolution attainable with our instrumentation. Particularly, our goal is to study the behaviour of the abundance discrepancy factor of O2+[ADF(O2+)], defined as the logarithmic difference of the O2+ abundances derived from collisionally excited and recombination lines. We find that ADF(O2+) remains fairly constant along the slit positions of M8 and M17. For NGC 7635, we only detect the O ii recombination lines in the integrated spectrum along the whole slit, where ADF(O2+) reaches a remarkably high value of about 0.59 dex. We compare our results with previous results obtained for the Orion Nebula. We find much evidence to suggest the presence of a candidate Herbig–Haro object in M8.

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Section: Introductionmentioning

confidence: 99%

Small-spatial-scale variations of nebular properties and the abundance discrepancy in three Galactic H ii regions★

Mesa‐Delgado¹,

Esteban²

2010

Monthly Notices of the Royal Astronomical Society

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“…Unlike ground tracking, this method directly measures the velocity along the inter-SC link. Ranging is expected to have position accuracy of $1 m or better over averaging periods of $1000 s [21]. This suggests that velocities could be measured to $mm=s accuracy, corresponding to Doppler frequency errors on the order of $kHz.…”

Section: B Doppler Estimation Methodsmentioning

confidence: 99%

Time domain simulations of arm locking in LISA

2011

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Arm locking is a proposed laser frequency stabilization technique for the Laser Interferometer Space Antenna (LISA), a gravitational-wave observatory sensitive in the milliHertz frequency band. Arm locking takes advantage of the geometric stability of the triangular constellation of three spacecraft that compose LISA to provide a frequency reference with a stability in the LISA measurement band that exceeds that available from a standard reference such as an optical cavity or molecular absorption line. We have implemented a time-domain simulation of a Kalman-filter-based arm locking system that includes the expected limiting noise sources as well as the effects of imperfect a priori knowledge of constellation geometry on which the design is a based. We use the simulation to study aspects of the system performance that are difficult to capture in a steady-state frequency domain analysis such as frequency pulling of the master laser due to errors in estimates of heterodyne frequency. We find that our implementation meets requirements on both the noise and dynamic range of the laser frequency with acceptable tolerances and that the design is sufficiently insensitive to errors in the estimated constellation geometry that the required performance can be maintained for the longest continuous measurement intervals expected for the LISA mission.

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“…The measurement of the inter-spacecraft distance is performed thanks to a low frequency modulation of the laser frequency, transmitting and correlating pseudorandom codes. Another modulation (at about 1 GHz) is also required to transfer the Progress towards an electro-optical simulator for space based, long arms interferometers 5 noise of the on-board clocks and compensate for their effect on the analog to digital converters (ADC) timestamping [7,8,10,13,17,24,26,27]. These beat notes (carrying the 'science' as well as the ranging and clock synchronization signal) need to be measured at the level of the µcycle/ √ Hz, while following the frequency drifts between 5 and 25 MHz, due to the relative motion of the S/C.…”

Section: Au Sunmentioning

confidence: 99%

“…Progress towards an electro-optical simulator for space based, long arms interferometers 13 are constant and commute) and no gravitational wave signal. In that case, the simplest TDI combination (X, first generation) leads to :…”

Section: Elisa Modelmentioning

confidence: 99%

Status of the eLISA on table (LOT) electro-optical simulator for space based, long arms interferometers

et al. 2015

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We report on the progress in the realization of an electronic / optical simulator for space based, long arm interferometry and its application to the eLISA mission. The goal of this work is to generate realistic optics and electronics signals, especially simulating realistic propagation delays. The first measurements to characterize the simulator are also presented. With the present configuration, noise reduction factors of 5×107 for optical beat notes and 109 for RF beat notes have been achieved using the Time Delay Interferometry algorithm. The principle of the experiment has been validated and further work is ongoing to identify the residual noise sources and optimize the apparatus. Experimental Astronomy Experimental Astronomy Look Inside Other actions Export citation Register for Journal Updates About This Journal Reprints and Permissions Add to Papers Share Share this content on Facebook Share this content on Twitter Share this content on LinkedI

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Ranging and phase measurement for LISA

Cited by 16 publications

References 3 publications

Small-spatial-scale variations of nebular properties and the abundance discrepancy in three Galactic H ii regions★

Small-spatial-scale variations of nebular properties and the abundance discrepancy in three Galactic H ii regions★

Time domain simulations of arm locking in LISA

Status of the eLISA on table (LOT) electro-optical simulator for space based, long arms interferometers

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