Dale E. Gary Professor, Physics, Center for Solar-Terrestrial Research New Jersey Institute of Technology 1 09/24/2012Prototype Review Meeting.

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Presentation transcript:

Dale E. Gary Professor, Physics, Center for Solar-Terrestrial Research New Jersey Institute of Technology 1 09/24/2012Prototype Review Meeting

 Goals of the Meeting  Science Overview and Challenges  System Overview 2 09/24/2012Prototype Review Meeting

 This marks the beginning of the final year of the project.  The primary goal of this meeting is to review construction of the three-element prototype, software status, and discuss plans and schedule for evaluation and test leading to a CDR and final build-out of the array.  Additional goals of the meeting:  Examine the budget to ensure that we both spend out the funds by 2013 Sept. 30, and do not fall short in any area.  Revisit all aspects of the design and the interfaces between subsystems to ensure completeness and compatibility.  Thoroughly review the software elements of the system, and identify remaining challenges to prototype operation.  Begin to formulate the database details for the final project.  Revisit the scope of the calibration and data analysis challenge 09/24/2012Prototype Review Meeting 3

 Four science goals:  Flaring loops and particle acceleration in solar flares  Magnetic and plasma structure of active regions  Drivers of space weather  Nighttime observation of variable and transient sources  Flaring loops:  High temporal and spatially-resolved-spectral resolution (EOVSA is the first and only instrument capable of doing this routinely)  Spatially-resolved spectra provide physical measurements of magnetic field strength and direction, electron energy and pitch-angle distribution, ambient plasma parameters  Science targets are acceleration site, acceleration mechanism, initiation mechanism, transport processes, plasma processes 09/24/2012Prototype Review Meeting 4

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09/24/2012Prototype Review Meeting 6 +

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Dynamic Coronal Magnetic FieldsHAO, Boulder, CO 17 Sep

Dynamic Coronal Magnetic FieldsHAO, Boulder, CO 17 Sep Fitted B Model B Max Model B along axis Perspective View

Dynamic Coronal Magnetic FieldsHAO, Boulder, CO 17 Sep LOS Angle to B Power-law Index Relativistic Density

09/24/2012Prototype Review Meeting 12

 With really excellent imaging, and fine frequency resolution, modeling (confirmed by observation) predicts lots of interesting structure in the radio spectra.  Resolving this structure will give magnetic field strength measurements in the corona, something ONLY radio can do.  Other plasma parameters (temperature, density) are also derivable from these spectra. 09/24/2012Prototype Review Meeting 13

Dynamic Coronal Magnetic FieldsHAO, Boulder, CO 17 Sep

 The F10.7 solar activity index is a critical component of many models:  As a proxy for the ionizing solar radiation that produces the ionosphere  To gauge space weather effects on satellite orbits and on satellite and low-frequency communication  As input to ionospheric effects on GPS navigation  After a tight correlation of F10.7 on sunspot number and other indicators of solar cycle variability over several cycles, F10.7 seems to have deviated from them at the beginning of cycle 24.  The index is useful because it combines both thermal and magnetic activity. Images permit the separation of these two effects of solar activity, for a more thorough understanding of underlying causes of solar activity variation. 09/24/2012Prototype Review Meeting 15

8/14/2012CASPER 2012 Workshop 16 EST Data JVLA Data Finally, can image these enigmatic bursts for the first time. JVLA can make an image for every time-frequency bin on this dynamic spectrum

 Rapid measurement of 1-18 GHz spectrum (20 ms sample time, <1 s cycle time [0.2 s for 1-3 GHz], ~1 ms dead time)  Excellent amplitude and phase stability (1% amplitude stability—0.04 dB; 1º phase stability, each IF)  Excellent polarization accuracy (15 dB isolation, 20 dB after calibration, 2% overall accuracy)  Excellent calibration (system temperature goals 400 K for 2.1 m antennas, 50 K for 27-m, or equivalent, all bands). Note: warm receiver is coming in at 570 K, which means cool receiver must be no higher than 35 K. Current design is showing about 15 K, but coupler has to be tested.  Excellent 27-m sensitivity (15 K system temperature in core bands)—note 27-m surface accuracy is an issue.  High up-time fraction=>ease of maintenance, 2 subarrays, real-time diagnostics, spares  Real-time data products=>pipeline processing (images, burst spectra, time profiles, web-based data serving)  Community access=>offline analysis package, science center 09/24/2012Prototype Review Meeting 17

09/24/2012Prototype Review Meeting 18

 2.1 m antennas  All have arrived on site. Four are installed, with the three needed for the prototype now available by TCP/IP over fiber.  27-m infrastructure work  Rip-out of old wiring and installation of new wiring is done.  Installation of new control systems is done, but tweaking of controller is still to go (November 2012).  Surface analysis is done—no significant problems reported. The few spots on the backing structure that need repair have had new welding patches.  Final power to antennas yet to be done.  Fiber to antenna B yet to be done.  27-m cryo work  Feed drive mechanism designed, with tweaks pending final feed design.  Final feed design expected soon, but brackets to accommodate range.  Receiver component choices expected this week.  Building is done!  Network rack is fully installed.  Optical fiber from central array to rack is installed.  Equipment racks to be delivered in October.  Refurbishment of existing 2 m antennas—no action yet (DURIP proposal submitted) 09/24/2012Prototype Review Meeting 19

 I will let Wes describe the status, but essentially all parts for the prototype are ordered, most already delivered, boxes, brackets, etc., are being made, and assembly will begin soon.  The electronics room components (LO distribution module, Timing distribution module, correlator clock module, and the three downconverters) will be done first.  The front-end module will lag somewhat, but attention will be turned to that shortly. 09/24/2012Prototype Review Meeting 20

 Nimish will describe this in more detail.  ROACH-2 boards on order (should receive within 2 weeks!) Includes:  Enclosures (2) with fans, power supply  KATADC digitizers (2)  CX-4 mezzanine cards (4)  F-Engine design completed at 150 MHz, not tested.  X-Engine design partially completed, not tested.  NFS boot procedure needs to be tested—will happen next week (during Oct. 1-11).  Additional control via KATCP needs to be developed and tested. 09/24/2012Prototype Review Meeting 21

 Gelu will describe this in more detail.  Basic plan has been established, and general approach using xml to describe stateframe has been tested.  Communication between cRIO and ACC has been tested.  Actual control of antennas will be developed next week (during Oct. 1-11). Goal is to be able to track the Sun under Schedule control with the three prototype antennas by then.  Schedule infrastructure has been designed and some parts tested, more to be done Oct  Coordinate calculation will use Aipy Python software, to generate delays and u,v,w coordinates. Aipy also includes some Miriad data handling and may be useful for pipeline scription. 09/24/2012Prototype Review Meeting 22

 Gordon and Jim will describe this in more detail. I may not have the details right, but the following is my understanding:  Software can receive data from two sources (two files, but simulates two UDP ports) and assemble them correctly, and present them to the packaging processor.  The packaging processor averages frequency channels and has hooks for phase and amplitude corrections, and writes out valid Miriad data files.  Also can form SK and create/apply RFI flags.  How will DPP receive and use 1 pps and 50 Hz hardware signals? Has a suitable digital i/o board been identified? 09/24/2012Prototype Review Meeting 23

CATEGORY AMOUNT BUDGETED TOTAL EXPENDEDENCUMBEREDPROJECTEDREMAINING PERCENTAGE REMAINING Salaries 906, , , , , % Fringe 221, , , , , % Equipment 2,299, ,176, , , % Supplies 23, , , , % Travel 66, , , % Other 12, , , (784.40)-6.28% Consultants 200, , , , % Subcontracts 476, , , , % Capital Improvements 79, , , % Tuition 119, , , , % Indirect Costs 715, , , , , % TOTAL 5,121, ,380, , , ,464, % 09/24/2012Prototype Review Meeting 24 EQUIPMENT ($927 k remaining) 10 more front-ends and components more auxiliary boxes and components more cRIOs more downconverter modules and components256.7 Misc. Racks, Cables additional Hittite synthesizer more ROACH-2s and enclosures, cables Arista switch 61.8 Computers m reflectors cryo-receivers and feed horns for 27-m 80.0? 2 compressors, coolers. cryostats, for 27-m feed-positioning apparatuses (apparati?) 25.0? Fiber and splicing m power trenching solar power stations 40.0 TOTAL990.5 SALARIES ($234.5 k remaining) Considering hiring a postdoc, but must be soon. Any ideas? Should also seek at least one additional grad student, perhaps from EE. TUITION ($69.6 k remaining) Most of this will remain unspent, and can be moved to another category. CONSULTANTS At least $15 k of consultant encum- brance will return to us, but more will be spent.

 We have one more year to spend remaining dollars (no extensions!).  The budget is tight, but it should be, given that we want to have zero dollars at the end of the project.  Overall, the spend-out looks about right, with a slight surplus showing, but many costs not exactly known. Also, undoubtedly travel costs will exceed remaining budget (this meeting, CDR, travel and stays at OVRO). We should remain in a mode where we minimize costs (without jeopardizing quality).  I will explore adding a postdoc and a grad student (EE) to the project in the final year, and possibly also support for a CS student.  If we have funds remaining near the end of the project, we might consider using them to support a community tutorial meeting. 09/24/2012Prototype Review Meeting 25

26 09/24/2012Prototype Review Meeting