1. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw1 DES Collaboration Meeting Front End Electronics Status T. Shaw, D. Huffman, M. Kozlovsky, J. Olsen, W. Stuermer (FNAL) T. Moore, V. Simaitis (UIUC) M. Barceló, L. Cardiel (IFAE) J. Castilla, J. DeVicente, G. Martinez (CIEMAT) P. Moore, R. Schmidt (NOAO)

2. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw2 DES FE Project Definition We must read out a large focal plane of CCDs 62 Science CCDs 8 Alignment CCDs 4 Guide CCDs The Science and Alignment CCDs are read out at the same rate with the same clocking patterns 250k-pixels/s @ 10e - rms noise The Guide CCDs will be readout at a faster rate; will not interfere with required “quiet” time of Science and Alignment CCDs

3. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw3 Monsoon Readout System is the chosen platform for test and production electronics Monsoon –Developed by NOAO –Crate based system (Eurocard format) –cPCI backplane used (not cPCI protocol) –Open Design Schematics available Firmware available Layout files available –Boards exist Master Control Board Clock and Bias Board 8 Channel Acquisition Board –Large software framework exists http://www.noao.edu/ets/monsoon/

4. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw4 Monsoon Crate MCBCBB 8-Ch CCD Acq.

5. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw5 Monsoon at FNAL - 2006 Feb 2006 Delivery of two additional complete Monsoon Systems. One was shipped to Barcelona Mar 2006 With “short” cable run, we are able to achieve ~6.5e - noise at ~6us/pixel April 2006 With a pre-amp located outside of dewar wall, we are able to achieve ~6.5e - noise at ~6us/pixel with a long cable July 2006 Delivery of fourth Monsoon system for FNAL August 2006 FNAL Director’s review recommends use of JFET source follower close to CCD video output October 2006 Begin instrumenting the Multi-CCD test Dewar (MCD) December 2006 Simultaneous readout of two CCDs in MCD.

6. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw6 Proposed Changes to Monsoon To use the Monsoon System for Production DES Electronics, we will customize the boards for our specific application: –Build a 12 channel CCD Acq Module which would provide customized bias voltages, RTD readout, and Vsubstrate ramp control. –Build a customized Clock Board to better address our clocking needs; greater fanout ability to drive more clocks. –Slight modification to the Master Control Board to allow for switch to S-Link as the fiber optic link; also, look into multi-crate synchronization

7. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw7 12-Channel Board Why do we need to change the Monsoon Acquisition Board? System density –Limited space in proximity to the telescope. Increasing the Video Channel count to 12 to better match the system. Improved Control of CCD Biasing. –Better trimming of HV Biases –Control of Substrate voltage rise/fall time (Ramp). Adding Temperature read back for RTD sensors.

8. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw8 CCD Acquisition Card Description Main Board –12 Video Signal Channels AC Coupled 18-bit ADC (same as Monsoon!) –48 High Voltage Biasing Signals with Telemetry –Micro-Sequencer Pattern Memory –On-Board Temperature Sensor (10 bits) –6 Channels for RTD temperature sensors on CCD –Single FPGA for control: JTAG programmable –Board Identification Registers Transition Module –allows for differential inputs –power filtering –substrate voltage distribution (up to 48V)

9. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw9 CCD 12 Channel Acq. Board Temp. Sensor Digital Serial Number Reset Interface 6 Chan RTD 12 bit ADC Telemetry Interface X48 12 bit DAC Interface X48 18 bit ADC Interface X12 CDS Interface X12 Back Plane RAM Memory  -Sequencer FPGA 900 pin BGA JTAG Prog. Transition Card (12 Video Channel Inputs)

10. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw10 Top View

11. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw11 Bottom View

12. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw12 12-Channel Transition Module

13. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw13 DES New Clock Board New Clock Board is being designed by engineers at CIEMAT (Madrid) which will drive many more clock lines. The current NOAO board provides 32 clocks, the new board will provide 135, or enough for 9 CCDs.

14. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw14 9 CCDs CB-36 clk Backplane MAIN board Transition CRATE 135 clk VIDEO Board DES Clock Board Concept CCD 3 X 15 CLK CCD 3 X 15 CLK 9 CCDs CCD 3 X 15 CLK CCD 3 X 15 CLK CB-36 clk Transition 135 clk

15. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw15 FPGA 36 CLK Voltage swing generation 135 Cable Drivers Hardware redesign MONSOON CBB DES CB supply Telemetry 32 CLK BIAS CPLD FPGA BIAS section removed 4 clock generation channels added 135 cable drivers included on board 2 CPLD removed supply Telemetry

16. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw16 Firmware redesign BIAS control removed Code integration: from 2 CPLD+FPGA to 1 FPGA New microsequencer development microsequencer SEQ BUS (write) TELEMETRY MUX FRONT PANEL DAC/ADC CONFIG ADCs DACs FRONT PANEL 36 Clocks BackPlane Interface PATTERN MEMORY (DUAL PORT) PROGRAM COUNTER GENERATION CLOCK TRIGGER REGISTER PIXDATA BUS (read) FPGA

17. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw17 Status: –Schematics and layout ready –Firmware ready for testing –Prototype is under production Future work: –CB testbench installation in Madrid (Monsoon based) –Prototype validation and characterization Clock board status

18. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw18 Master Control Board Upgrades Monsoon System has been installed at Barcelona and is working. Engineers from IFAE (Barcelona) are working on upgrading the Master Control Board –conversion of optical link from Systran to S-Link –examination of multi-crate synchronization protocol

19. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw19 FE Electronics Packaging UIUC has worked with FNAL mechanical engineers and proposes to instrument the telescope using three FE crates. These crates would each contain two backplanes; one with 6 slots and one with 4 slots. A single 4-slot section would provide for readout of up to 9 guide CCDs The remaining backplane sections would provide readout of up to 72 science and alignment CCDs. UIUC is also providing engineering support for crate power supplies.

20. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw20 PF Packaging FE readout electronics should fit within “purple” boxes. Boxes incorporate internal cooling system crates cooled with independent water alcohol mix internal electronics will be maintained at constant temperature ~20°C outside of box will be at ambient temperature; lots of removable external insulation -> this will minimize disturbances of ambient air at prime focus area.

21. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw21 Vacuum Interface Board(VIB) Vacuum Interface Board will provide the connection between the Monsoon boards and the CCDs on the focal plane. Monsoon cables will plug into the VIB outside the vacuum. Kapton cables will be used to connect between Vacuum Interface Board and the CCDs inside the dewar.

22. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw22 Vacuum Interface Board Kapton Cable AlN Board & CCD Camera Vessel Instrumentation JFET Board Pre-amp Board

23. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw23 Power Supply Studies Ongoing work by engineers at the University of Illinois on testing power supply performance. Goal is to prove viability of switching power supplies. Tests were run with Linear supplies and Vicor supplies attached to original Monsoon 6-slot DHE. Remote sensing was removed & local sensing added. Noise measurements are taken with video inputs connected to ccd emulator

24. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw24 UofI Monsoon Test Stand Wiring Scheme

25. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw25 Linear Supply Plot Results

26. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw26 Vicor Supply Plot Results

27. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw27 What’s Next? Near term goals Continue work on developing power supply solution Test fanout of clock signals; current plan uses common clock rail settings to drive a group of three CCDs Complete transition from Systran to S-Link for Monsoon communication link Noise studies with multi-CCD test vessel -> refine JFET, pre-amp placement and design; also finalize kapton cable design Complete bench testing of 12-Channel Board and Clock Board Test multi-crate synchronization

28. DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw28 Schedule Goals Jan. 2007 – Readout CCD w/12-Channel Board March 2007 – Conversion to S-Link complete March/April 2007 – New Clock Board at FNAL and being used to readout CCDs; integrated with 12-Channel Board April 2007 – New VIB installed in multi-CCD test vessel to allow testing with new boards and cables Dec 2007 – Integration testing of 2 nd versions of new 12- Channel and Clock Boards