Boulder

1. 2 Boulder A New Generation Submillimetre Camera for the James Clerk Maxwell Telescope

2. NIST Presentation 2 Outline: • Project summary • Management plan and costs • CoDR and Board outcomes • Pre-select phase • Agenda for this week

3. Boulder SCUBA-2: The next generation submillimetre camera for the James Clerk Maxwell Telescope 2 Project Summary

4. Utilise the large field-of-view of JCMT to open-up new fields of study 2 Why do we need SCUBA-2? • New technologies  Larger format arrays • Increase scientific productivity of telescope • Maximise the returns with impending arrival of SMA link and heterodyne arrays • Keep the JCMT at the forefront of submm continuum astronomy

5. Mapping speed >100 times that of SCUBA 2 Next generation : “SCUBA-2” • Per-pixel sensitivity Goal is for 50% better than SCUBA • Dual-wavelength imaging Operation at 450 and 850m • Image fidelity and map dynamic range Full-sampling of the image plane

6. SCUBA-2 Field-of-view Array boundary Vignetted area ~11arcmin ~8 arcmin 64 arcmin2 95 arcmin2 (B) Minimum F-O-V (A) Maximum F-O-V

7. 2 Pixel Details • An 8  8 arcmin field, fully-sampling the image plane:  6,500 pixels at 850m and 22,500 at 450m • Increase in mapping speed >> 100 at both wavelengths • Physical dimensions of array: • For final optics of f/2.5 the arrays are ~120mm in diameter

8. 2 Summary of main systemcomponents • Detectors: Transition-edge sensors with SQUID readouts • Electronics: Multiplexed SQUIDs and room temperature amplifiers • Cryogenics: Two compact 3He systems and two pulse- tube coolers • Cold optics: Re-imaging mirrors and array baffling; magnetic shielding for SQUIDs • Relay mirrors: To re-image beam onto Nasmyth platform • Data acquisition:VME crate (or similar) to fast workstation

9. Some practical examples...

10. Example: Deep Extragalactic Surveys SCUBA CFRS Survey 7 × 6.2 arcmin 22 sources > 3 rms noise ~ 1 mJy 78 hrs of Band 1/2 time SCUBA-2 Survey in the same time to 1mJy rms ~ 2 degree2 ~ 1250 sources > 3

11. Boulder SCUBA-2: The next generation submillimetre camera for the James Clerk Maxwell Telescope 2 Management Plan

12. Two proposals being considered: (1) Two-phase approach: Technology Development and Verification followed by Science Instrument Construction (2) Single-phase approach: Combine development and science instrument construction 2 The Project

13. Pre-select Phase Prototype arrays Technology demonstrator Key technologies Science Instrument Pixel architecture and base temperature selection Prototype arrays and electronics Cryostat and optics to prove array technology Filters, window, stray light control, thermal tests of cables Systems analysis and outline design 2 Instrument Development and Verification

14. Timescales Spend Instrument Development and Verification Pre-select phase NIST contract 0.5 yr ~$20 k May 00 Science Instrument Systems analysis Sub-system design Key sub-systems Technology Demonstrator Prototype array and electronics 2.5 yr May 02 $2000 k Order long lead items Early spend of extra $500k? Technology Verification 3 yr Nov 02 $2700 k (inc. extra $500 k) Science Instrument Construction Final design and construction Key sub-systems Science arrays and electronics 4.5 yr May 04 $4500 k Integrate and lab test 5 yr Nov 04 $4900 k Telescope infrastructure Telescope commissioning Science Operations 5.5 yr May 05 $5600 k

15. The aim of the SCUBA-2 project is provide a new generation wide-field bolometer camera to the JCMT 2 Management Plan GOAL:To maximize the science yield in the context of future facilities What is a realistic time to results? Answer: Estimate 4.5 - 5.5 years (with realistic risk management)

16. 2 Management Plan Key organisations: • ATC Key skills and experience in major projects including SCUBA • NIST The clear leader in TES technology, SQUID multiplexing and control electronics • U of E Demonstrated expertise in silicon micro-machining + technology development in the UK • QMW Key technologies and expertise in filters, FTS testing, window materials, detector testing • JAC The customer plus key experience with SCUBA

17. 2 SCUBA-2 Array Development PPARC JAC Grant Project Manager: Per Friberg Project Management NIST Project Manager: William Duncan Project Manager: Kent Irwin ATC Project Team University of NIST Project Team Edinburgh Edinburgh Silicon micro-machining TES fabrication and Pixel thermal and EM design fabrication SQUID readouts Prototype arrays Science arrays

18. Boulder SCUBA-2: The next generation submillimetre camera for the James Clerk Maxwell Telescope 2 JCMT Board summary

19. 2 Outline of Pre-select Phase • Selection of pixel architecture and base temperature • Costings and staff effort estimate for the two approaches • Contract negotiations with NIST • Detailed risk analysis • Management structure for project (key staff recruitment) • Look for possible partners to offset development costs

20. Boulder SCUBA-2: The next generation submillimetre camera for the James Clerk Maxwell Telescope 2 Pre-select Phase

21. 2 Key Dates 18 - 21st Jan : NIST meeting Early Feb : Presentation to PPARC Astronomy Committee (London, UK) Early Feb : Decision on UoE PPARC Grant 3rd May : Array tech selection meeting (ATC) 15th May : JCMT Advisory Panel meeting 22 - 23 May : JCMT Board meeting (HIA, Victoria) Other key dates to be confirmed...

22. 2 Key Technology Issues • Pixel architecture • Feedhorns versus filled arrays • Bump bonds • Base temperature selection • 1/f noise • Readout electronics • Stray light

23. 2 “COST PER PIXEL” UKT14 1 1 $800,000 SCUBA 131 ~7000 $70,000 SCUBA-2 30,000 >106 $250

24. 2 Outline Agenda Tue 18th am : Introduction and presentation pm : Contract discussions Wed 19th am : Complete contract discussions pm : Tour of facilities (EIR/LM/SR) Technical discussions Cryogenics (Ray Radebaugh) Thu 20th am : Technical discussions continue Optics (Hyperfine visit) pm : Finalise plans for NIST work during pre-select phase Fri 21st am : Feedhorns (?) pm : Conclude