IEU Experimental Activity : Big Baryon Oscillation Spectroscopic Survey (BigBOSS)

1. May. 18. 2010 IEU Experimental Activity : Big Baryon Oscillation Spectroscopic Survey (BigBOSS) IEU Workshop on Cosmology and Fundamental Physics Institute for the Early Universe, Ewha W. Univ., Seoul, Korea May 17-19, 2010 Heuijin Lim (IEU, Ewha W. Univ.)

2. May. 18. 2010 BigBOSS Introduction A proposed DOE-NSF Stage IV ground-based dark energy experiment • To study baryon acoustic oscillation (BAO) • To study the growth of structure with an all-sky galaxy redshift survey. To target luminous red galaxies for z<1 star-forming galaxies for 1<z<2 quasi-stellar objects (QSOs) for 2<z<3.5 • Simultaneous spectroscopic surveys for 50 million galaxies and 1 million QSOs • Plan • R&D program will be done until the early of 2011. • Operation will start in 2015. • BigBOSS-North : 6 years run with 4m Mayall telescope at KPNO. • BigBOSS-South : 4 years run with Mayall-sister telescope at CTIO. • Cost Estimate • R&D, Construction and installation ~ $75.4 M including 30% contingency. • Operation costs will be $2.5M/year.

3. May. 18. 2010 BAO and dark energy z ~ 0.3 z ~ 1100

4. May. 18. 2010 BigBOSS : comparing to other exp.

5. May. 18. 2010 Comparing surveys

6. May. 18. 2010 (ex) Cosmological parameter constraints From Nikhil Padmanabhan’s 2009 Jul. PASAG’s talk • Spectroscopic coverage for next-generation imaging surveys (PanSTARRS, DES, LSST) • Photo-z calibration for weak lensing surveys • Enhanced dark energy constraints equation-of-state parameter, w(a)=w0+waz/(1+z)

7. May. 18. 2010 Telescope  1 spectrograph accepts 500 fibers

8. May. 18. 2010 Functional Block Diagram 30m fiber from Focal plane to Spectrographs

9. May. 18. 2010 Fiber positioner A corrected Ritchey-Chrétien configuration with a 3° diameter field of view. Automated fiber-positioners on the focal plane : fiber is moved in a 2-dim. plane (a rotational axis and a translation axis)  +- 20 micron positioning accuracy  Targeting 5,000 objects simultaneously!

10. May. 18. 2010 Spectroscopic Targets

11. May. 18. 2010 Spectrographs

12. May. 18. 2010 IEU Lab. Facilities The most of optics items will be ready the next months. Clean class ~ 500 Test Room

13. May. 18. 2010 Outline of Test System

14. May. 18. 2010 Test using the laser Output V-groove Output image from CCD camera Input Ferrule Red laser (~1mW) was injects to the head of optical fiber which is using for BOSS exp.

15. May. 18. 2010 Schedule of Test/Implementation of Fibers • Phase I : Development Mode (~2011) • Setup the testing system in IEU • Test the fiber performance using different vendors, configurations, techniques etc. • Determine the fiber with the best performance and the final design of terminations, blocks etc. • Phase II : Production Mode (~2014) • Mass productions of fibers • Setup the automatic test system for huge number of fibers • Test 5000 fibers • Provide the good qualified fibers to BigBOSS telescope

16. May. 18. 2010 Summary • The BigBOSS is a proposed ground-based dark energy experiment and will complete the survey of 50 million galaxies from 0.2<z<3.5 over 24,000 deg2 for 10-year operations. • Will measure the expansion of the universe and the growth of the structure in the universe. •  Enhance the Dark Energy Science. • As a precision cosmological probe, the neutrino mass, the inflation, and the primordial non-gaussianity will be studied. • IEU joins the BigBOSS exp. the end of last year. • Responsible to implement the fiber optics. • Start to build/prepare this test system and the R&D of fiber optics this year. And we’re proceeding this stage smoothly. • Reference : • http://bigboss.lbl.gov/ • http://arxiv.org/abs/0904.0468