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Найдено 182 документов по запросу «JDEM». [Перейти к поиску]


Дата загрузки: 2016-11-23
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0.08/5
... of a Joint Dark Energy Mission (JDEM). The ROF system illuminates the... An attitude control testbed for JDEM K. A. Reil, A. J. Roodman, SLAC National Accelerator..., jitter and PSF requirements for JDEM come from the weak lensing... the Joint Dark Energy Mission (JDEM). This mission will tightly constrain... 14 Optical performance budgeting for JDEM weak-lensing measurements M. C. Noecker, Ball...-DOE Joint Dark Energy Mission (JDEM). The measurements are challenging, because...-to-grave support of the JDEM program. Finally, we will briefly...) The Joint Dark Energy Mission (JDEM) will be using photodiodes as... of internal calibration light sources. JDEM requires space qualified Si and... the context of the SNAP / JDEM project, we present here a study... States) Many future missions, including JDEM, are designed as wide-field...



Дата загрузки: 2017-04-09
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0.33/5
...-time tools previously developed for JDEM. We further compare these four alternative WFIRST configurations to JDEM-Ω and to the European Space... Joint Dark Energy Mission (JDEM) family, in particular JDEM-Ω (Gehrels 2010). WFIRST... payload concepts with the original JDEM-Ω design on which the Decadal... in Table 3. Compared to the JDEM-Ω payload, the WFIRST configurations show... improved galaxy count compared to JDEM-Ω and Euclid. In particular note... than the 1.5m aperture of JDEM-Ω. A useful sample of spectroscopic redshifts... arcminute WF-A WF-B WF-C WF-D JDEM-Ω Euclid Euclid+ 5578 4067 4616... Results WF-A WF-B WF-C WF-D JDEM-Ω Euclid Euclid+ SNe followed per...., 2008; Cerna et al., 2010). JDEM-Ω baselined a slitless spectrometer channel responsible... the supernova spectroscopy requirement. In JDEM-Ω spectroscopy, the zodiacal background per... expected within the JDEM-Ω field for a given exposure. JDEM-Ω therefore does not..., dark energy mission planning (e.g. Euclid; JDEM) is usually based on observing... studied downlink options for SNAP/JDEM during 2008. In particular they... the Joint Dark Energy Mission JDEM-Ω concept considered by the Decadal... also compared these configurations to JDEM-Ω and to the European Space... 2.5 times the survey rate of JDEM-Ω, and an improved density of..., WFIRST-A surveys 2.8 times faster than JDEM-Ω and six times faster than..., N., “The Joint Dark Energy Mission (JDEM) Omega,” arXiv:1008.4936 (2010... accommodation study for WFIRST payloads,” JDEM Project Office Drawing No. 1029.... & Astroph. v.457, 841-856, (2006). JDEM Interim Science Working Group (ISWG... wheel into the WFIRST Imagers,” JDEM Project Office Drawing No. 1165-A (2011). Levi, M. “JDEM Mission Calculator” (JSIM) http://jdem.lbl.gov/public...



Дата загрузки: 2017-04-09
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0.15/5
... risk and cost of the JDEM-Omega mission design, as submitted... Office opted to use the JDEM-Omega hardware configuration as an... previously identified (both on the JDEM SCG and during the New..., the cosmological community, through the JDEM Science Definition Team, the Dark... Task Force, and by the JDEM Figure of Merit Science Working... already developed as part of a JDEM Engineering Development Unit (EDU) Focal... the IDRM, a change from the JDEM-Omega baseline. Shifting the secondary... to 1.3m, from 1.5m on JDEM-Omega, while still providing equivalent... limiting flux as compared to JDEM-Omega. The unobscured telescope allows... incorporates minor modifications from the JDEM-Omega instrument. Two detectors from... 2.0 µm) for the Exoplanet survey. Finally, JDEM-Omega proposed using 2.5µm long-wavelength... EDU was started on the JDEM project and work continues Section... acceptable cost), the 35 WFIRST JDEM/WFIRST project initiated a detector demonstration... of demonstration parts that the JDEM/WFIRST project is building already... a Phase A start in FY13. The JDEM Omega RFI identified weak lensing... relatively few changes from the JDEM-Omega reference mission, and thus... system was begun for the JDEM Omega concept, and is now... within their budgeted tolerances. The JDEM-Omega studies found that it..., comprehensive trades. Results from the JDEM mission concept study teams can... directions near-simultaneously (as did JDEM-Omega). Both appear to be... WFIRST IDRM The NWNH took JDEM-Omega to be the template for WFIRST, saying that JDEM-Omega seemed nearly ideally suited... science goals. The SDT took JDEM-Omega as the starting point... is more expensive than for JDEM-Omega, it is less likely... same wavelength cutoffs as in JDEM-Omega. In the year between... ImC IMF IR IRAS JCL JDEM JWST KDP KSC L2 LCCE...



Дата загрузки: 2017-05-20
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0.48/5
... the Joint Dark Energy Mission (JDEM) Figure of Merit (FoM) Science Working Group (SWG), the FoMSWG. JDEM is a space mission planned by... a Working Group for a space-based JDEM, we will not discuss other... of the JDEM era, with details of these pre-JDEM “data models... this set of standardized pre-JDEM data models. Section V describes quantities... gauge the effectiveness of proposed JDEM investigations, and which can be... from the Fisher matrices of JDEM data models. Section VI presents... function in the era when JDEM has sensitivity to growth, taken... in SN measurements for pre-JDEM are conservative, in the sense... astrophysical knowledge are assumed before JDEM. For our WL Fisher matrix... include clusters in our pre-JDEM Fisher matrix, because we were... energy parameters in the “pre-JDEM” time frame. To be explict... a cosmological likelihood function available before JDEM is begins its first data..., more precisely, shear peaks. Any JDEM executing WL shear tomography would... to 11 109 h−3 Mpc3 [26]. A JDEM-class survey providing 100 million..., adding it to our pre-JDEM prior improves the DETF FoM... included in the FoMSWG pre-JDEM standard prior, since not all... note that ongoing studies of JDEM weak-lensing programs suggest that... constraint on ∆γ in the pre-JDEM era, depending on the level... the Fisher matrix for each JDEM technique individually, as well as... to understand. For our pre-JDEM data, 15–20 of the... in Eq. (21). Since the JDEM principal components will be determined even better than the pre-JDEM ones, we see that our... the true intrinsic power of JDEM to probe w(z). The remaining step... quantify how much JDEM improves upon the pre-JDEM errors. This can be done by plotting the ratio σi−2 (JDEM) , σi−2 (pre-JDEM) (22) where pre-JDEM errors (that we... Eq. (21) completely dominates σi2 (JDEM)). An example of a graph of the first principal components of a JDEM mission is shown in Fig... 2 shows the corresponding ratios σi−2 (JDEM)/σi−2 (pre-JDEM). To construct this figure, it... know the values of σi (pre-JDEM). They are given in Table... energy from a JDEM mission, normalized to the pre-JDEM knowledge. The data... not correspond to any proposed JDEM, but invented merely to illustrate... 0.905 0.929 0.955 TABLE I: Pre-JDEM values of σi for the first... the nominal launch date for JDEM will be sometime in 2016... describe the scientific reach of a JDEM. Our efforts have been directed... survey specifications. 2. Graph of σi−2 (JDEM)/σi−2 (pre-JDEM): This graph is an indication... accuracy as the result of a JDEM. Recall that the DETF parametrized... have large ratios of σi−2 (JDEM)/σi−2 (pre-JDEM). Existing computations of principal components... case, the graph of σ i−2 (JDEM)/σi−2 (pre-JDEM) allows one to make an... in larger values of σi−2 (JDEM)/σi−2 (pre-JDEM). Wild discrepancies would indicate the... models for pre-JDEM results indicate a value of σ(∆γ) = 0.21. A JDEM should result... z. APPENDIX A: PREDICTIONS FOR THE PRE-JDEM FISHER MATRICES 1. Planck Fisher Matrix... a 2σ change.7 On the timescale of JDEM, it is likely that B-mode... it with other information. 2. Pre-JDEM Weak Lensing Fisher Matrix The... will be available for pre-JDEM. We noted that for a ground... bκ rκ in the nonlinear regime. 3. Pre-JDEM Baryon Acoustic Oscillation Fisher Matrix... any level that would affect a JDEM choice. For convenience, we registered... in the FoMSWG pre-JDEM data model. 4. a. Pre-JDEM Supernova Fisher Matrix... available at the time of a JDEM launch, taken to be 2016... measure the incremental impact of a JDEM on knowledge of cosmological parameters... distance errors. The task for a JDEM proposer will be to describe... in the next 7 years (before JDEM). Therefore, we assume a conservative floor... significant principal components, the assumed JDEM sample was that used by the DETF. b. Assumptions about pre-JDEM SNe Surveys The early results... assumed in constructing the pre-JDEM data model. Looking ahead, we... 0.31 0.21 TABLE IV: Pre-JDEM expansion and growth history parameter... 500 objects into our pre-JDEM priors. We also assume that... 2016 (the beginning of the JDEM mission). Current methods for estimating... has been assigned. APPENDIX B: PRE-JDEM PERFORMANCE After constructing the Fisher... on the FoMSWG website http://jdem.gsfc.nasa.gov/FoMSWG. Brief... a C program to take the pre-JDEM Fisher matrices as input and... an imagined JDEM or for a different realization of a pre-JDEM Fisher matrix... package is available from the JDEM website as a gzipped tarball (named... B for Planck and the pre–JDEM BAO, SN and WL observations...



Дата загрузки: 2017-05-20
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0.54/5
Status of JDEM HEPAP Meeting November 13, 2008 .../NASA Joint Dark Energy Mission (JDEM) Both the National Academy “Beyond... NASA should work together on JDEM. DOE, NASA and Office of... the plan for a mission. The JDEM website with our plan was... on September 12, 2008 Æ http://jdem.gsfc.nasa.gov Topics: Summer.../3/08. DOE and NASA signed a JDEM MOU on 11/7/08. Details will be available soon. JDEM DOE’s Starting Points DOE plans... ~ $200M in FY08$ to the JDEM project – construction + operations NASA should.../NASA Joint Dark Energy Mission (JDEM) Letters Exchanged between Ed Weiler... NASA agree to partner in a JDEM. • NASA will be the lead agency for JDEM, responsible for the success of the overall space mission. • JDEM will be a medium-class strategic... will be a central tenet of JDEM project management and mission design.../NASA Joint Dark Energy Mission (JDEM) Letters Exchanged between Ed Weiler... its contributions. • Public release of JDEM data will occur after an... point of contact for the JDEM project in negotiating and executing... signed a Memorandum of Understanding JDEM Project Offices A JDEM Project Office (PO) has..., and will interact closely with JDEM scientists during all phases of... lead the all DOE efforts. JDEM Figure of Merit Science Working... be optimum.” Charge to the JDEM SWG – produce findings: • Update or... October – presentations to AAAC and JDEM SCG http://www.nsf.gov... ~ end-November – final results available JDEM Science Coordination Group (SCG) Chair... at the web site: http://jdem.gsfc.nasa.gov/comments.html... requirements and instrumentation capabilities for a JDEM mission using the science performance...-conceptual design, provided by the JDEM Project Office using the BAO... coordination with the SCG, the JDEM PO will modify the initial... will be incorporated into the JDEM AO and the science teams... can propose to the AO JDEM AO Information A Letter to Community... was posted 11/3/08 to JDEM website. The notice was also...) science investigations using the relevant JDEM data set; b) DE Supernovae (SN) science investigations using the relevant JDEM data set; c) DE Weak Lensing...) science investigations using the relevant JDEM data set; d) DE science investigations... the relevant JDEM data set; e) Leader of the JDEM Science Working Group... science investigations using the relevant JDEM data set. It is anticipated... constitute the JDEM Science Working Group (SWG). The JDEM SWG will work with the NASA JDEM Project Office..., development, and operation of the JDEM observatory. All members of a selected... will have access to that JDEM data necessary for the execution of their proposed science investigation. JDEM AO Information cont. It is... energy science investigation using the JDEM Reference Mission pre-conceptual design...-based selection of the JDEM SWG, the JDEM design may evolve from... the methodology defined in the JDEM FoMSWG Report to document the... thereby quantify its science performance. JDEM data, including suitable calibration and... the Community for more details. JDEM MOU Ray Orbach and Ed... Science Mission Directorate) signed the JDEM MOU on 11/3/08 and... will be posted on the JDEM website. Note: Most of the... slides. Joint Dark Energy Mission (JDEM) DOE Æ DOE program manager (OHEP): Kathy Turner DOE JDEM project Manager: Michael Levi (LBNL... Salamon JDEM Program Executive: Ray Taylor JDEM Program Scientist: Richard Griffiths JDEM Project...: Kevin Grady, Acting Project Manager JDEM Timeline The agencies continue to... dark energy investigations using the JDEM facility. • A letter to the community... the next few months, the JDEM Project Offices at DOE and... collaborators will work with the JDEM Project Offices at both agencies...



Дата загрузки: 2017-05-20
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0.12/5
... a Joint Dark Energy (Space) Mission (JDEM). 2 Our recommendations are based on... statistical and systematic uncertainties. Because JDEM, LST, and SKA all offer... a Joint Dark Energy (Space) Mission (JDEM). 9. Just as dark-energy science.../NIR Joint Dark Energy Mission (JDEM) satellite, using one or more... the four techniques. c. an x-ray JDEM satellite, which would study dark... needed to execute LST and JDEM are largely in hand. (The... Stage IV projects considered (LST, JDEM, and SKA) offers compelling potential... is uncertain. b. An optical/NIR JDEM can mitigate systematic errors because... risk than an optical/NIR JDEM, but could in many respects match the power of JDEM if systematic errors, especially if... a Joint Dark Energy (Space) Mission (JDEM). There are four primary observational... statistical and systematic uncertainties. Because JDEM, LST, and SKA all offer... statistical and systematic uncertainties. Because JDEM, LST, and SKA all offer... a Joint Dark Energy (Space) Mission (JDEM). We use Fisher-matrix techniques... ways that are complementary to a JDEM SN survey, which would have... a space-based dark-energy experiment (JDEM): 1. A single space mission appears capable... for combining SN+WL on JDEM-class missions, with significant optically... DETF data models, but the JDEM Concept Studies will better explore the breadth achievable in a single JDEM mission. 2. The primary virtue of... would bring this to 17. 3. JDEM may be, in this sense... to ameliorate key systematic errors. 4. A JDEM with NIR capabilities could make... of methods to include on JDEM should be weighted toward those... a single mission within the expected JDEM budget. 50 6. In this regard... stands alone since the other JDEM approaches use widefield optical/NIR... statistical power. 7. While executing both JDEM and LST would certainly improve... both. 8. Most proposed forms of JDEM observatory would greatly expand our.... b. The Joint Dark Energy Mission (JDEM) is a DOE/NASA effort aimed... a supernova experiment carried out on JDEM. zmax zmin N_bin Continued: zmax... no IIIb 4000 0.5 1.4 9 yes IVS (JDEM) 10000 0.5 2 10 no IVG (SKA...-based Joint Dark Energy Mission (JDEM) and coordinated ground-based CMB... and optimization of LST and JDEM. The DETF is asked to... are required in preparation for JDEM, LST and other existing or...-based Joint Dark Energy Mission (JDEM) and coordinated ground-based CMB... and optimization of LST and JDEM. The DETF is asked to... are required in preparation for JDEM, LST and other existing or... – 11:00 Coffee and Conversation JDEM SDT Activities Committee Discussion C. Bennett... and Announcements Committee Discussion JDEM concept: DESTINY Break JDEM concept: JEDI R. Kolb J. Morse A. Crotts A. Albrecht Update on JDEM SDT... Reconvene in Room 9 South East JDEM concept: SNAP (videoconference) 1:40 – 1:50... CMB data obtained from the JDEM NASA - DOE Investigation Riess, Adam...-DOE Joint Dark Energy Mission (JDEM) Crotts, Arlin arlin@astro.columbia..., Saul saul@lbl.gov Pre-JDEM Dark Energy Studies with SNe..., Saul saul@lbl.gov SNAP/JDEM Overview Cordes, Jim cordes@astro...



Дата загрузки: 2016-12-24
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0.24/5
... errors go to +- .0012 Planck+JDEM+DUNE blind b-spline Ps(lnk... +- .07 Planck+JDEM+DUNE ςs=+- 1.001d2lnV/dψ2/4 @aeq ςs ~ 0.1 +.6 -.7 to +.6-.7 Planck+JDEM+DUNE LCDM to... errors go to +- .0012 Planck+JDEM+DUNE blind b-spline lnPs(lnk... +- .07 Planck+JDEM+DUNE ςs=+- 1.001d2lnV/dψ2/4 @aeq ςs ~ 0.1 +.6 -.7 to +.6-.7 Planck+JDEM+DUNE LCDM to... aeq Beyond Einstein panel: LISA+JDEM Forecast: JDEM-SN (2500 hi-z + 500.../BAO, Lyα Cosmic Probes Then JDEM-SN + DUNE-WL + Planck1 Zhiqi... gradient)2 to +-0.07 then Planck1+JDEM SN+DUNE WL, weak Saturday..., 2009 Beyond Einstein panel: LISA+JDEM Forecast: JDEM-SN (2500 hi-z + 500...



Дата загрузки: 2017-05-20
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0.67/5
... the Joint Dark Energy Mission (JDEM), would offer a powerful opportunity to... white paper we refer to JDEM as an example of an... the redshift range 0.7 < z < 2, suitable for JDEM, although surveys at other redshifts... modeling. Because it is in 3-D, a JDEM galaxy redshift survey will measure... 2SLAQ-lrg LCRS 103 102 JDEM BAO/GRS UV uB rR... Area (sq. deg.) 105 Figure 1: A JDEM galaxy redshift survey would be... the CMB. Of course, the JDEM galaxy redshift survey will primarily.... To name just a few, the JDEM galaxy redshift survey will: (1) measure... a standard ruler. Figure 2 shows how a JDEM galaxy redshift survey can reach..., reaching an aggregate of 0.1%. The JDEM measurements will measure distances, and... the distance determination shows that a JDEM galaxy redshift survey will complement... the radial BAO measurement of H(z). JDEM BAO 0.2 0.4 SNe 1% in flux 0.6 0.8 1 SDSS... observer and the horizon, and JDEM could measure an aggregate dA... important advantage of the method. JDEM could measure an aggregate H(z) of... this 0.2% effect to below the JDEM statistical error of 0.1%. More exotic.... In short, we expect the JDEM BAO measurement to be statistics...-field space telescope such as JDEM could also provide a valuable near... ground-based observatories. Broad-band JDEM near-IR images 5 for more.... 2008) so IR colors from JDEM, and the spectroscopic training sample... for weak gravitational lensing efforts. A JDEM wide-area sky survey in... very red objects in the JDEM survey that are detected only... JWST follow-up, so the JDEM survey will enhance the science... DES optical imaging, JDEM near-IR imaging, and JDEM spectroscopy will trace... ionized baryons. A cross-correlation between JDEM galaxies (to provide the velocity... in this gas. Non-Gaussianity: A JDEM galaxy redshift survey would place.... Afshordi & Tolley (2008) find that a JDEM-like galaxy redshift survey can... with the 3-D positions of the JDEM galaxies to measure the galaxy... with the nearly full sky JDEM galaxy redshift survey provides a measurement... a significant advance in CMB measurements. A JDEM galaxy redshift survey would be... is the dark energy? The JDEM galaxy redshift survey enables multiple... BAO measurements. Future Planck and JDEM BAO measurements will produce a substantial improvement. The JDEM data will also be used...



Дата загрузки: 2017-04-09
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0.26/5
... than is possible with Euclid. JDEM-Omega was an axisymmetric 1.5 meter... IDRM itself differs significantly from JDEM-Omega in that it has... (m) Science Focal Planes Science Detectors JDEM- 2010 1.5 Yes 2.0 3 36 H2RG-18...; Albrecht et al. 2006) and JDEM Figure-of-Merit Science Working... reconstruction algorithms have eliminated the JDEMΩ requirement that all of the... and DRM1, a change from the JDEM-Omega baseline. Shifting the secondary... be reduced to 1.3 m, from 1.5 m on JDEM-Omega, while still providing equivalent... limiting flux as compared to JDEM-Omega. The field of view... EDU was started on the JDEM project and work continues under... (at an acceptable cost), the JDEM/WFIRST project initiated a detector demonstration... two important respects from the JDEM-Omega reference mission configuration submitted... (WMAP) and builds on the JDEM Probe design developed in 2009... savings compared to the original JDEM Omega or WFIRST baselines. DRM2... has gone into refining the JDEM-Omega design concept that was... detail by the JDEM Interim Science Working Group, see jdem.lbl.gov... IFU IMF IR IRAS JCL JDEM JWST KDP KSC L2 LCCE...



Дата загрузки: 2017-05-20
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0.5/5
... the diffraction pattern. Previously published JDEM telescopes were centrally obstructed. Here....berkeley.edu 1. DARK ENERGY and JDEM The discovery of accelerated expansion... the Joint Dark Energy Mission (JDEM), are compared in Sholl et... high angular resolution is mandatory. JDEM’s scientific objectives were prioritized by... space-based. Working with the JDEM project offices at NASA and..., the ISWG quantified two alternative JDEM mission scenarios: Design A, performing a BAO... al.7 We summarize these two JDEM designs as they presently stand... Survey Weak Lensing Survey Table 1: JDEM Science Objectives6 Design A Design B 1500...