1. Todd Moore for the DES CollaborationApril 3 rd, 20071 Quick Summary of Noise Test Results. Noise test hardware & software setup. Earth grounding/shielding scheme utilized for noise tests. –Linear supply ground/shield scheme. –Vicor supply with uRAM active filter ground/shield scheme. –Vicor supply with voltage regulator ground/shield scheme. Test results. Conclusion… Vicor Noise Test Results Ver. 8.0

2. Todd Moore for the DES CollaborationApril 3 rd, 20072 Quick Summary of Noise test Results All tests use FNAL focal plane (_fnal) with a readout rate of 6uS/Pixel. Sigma count measurement could change by ~1.5 counts from day to day, however counts would remain the same for the whole day of tests. Lowest noise was accomplished using linear supplies (~5-6 counts Sigma). Sigma remained the same (~6 counts Sigma) when Vicor supplies +5VD, +/-5VA, +/-15VA, -28VA are connected to DHE. +48VA is not connected. +3.3VD is from linear supply. Sigma went up when +3.3VD is from Vicor supply (~11 counts). This is due to not having an internal uRAM filter in the Vicor supply. (Vicor doesn’t make a +3.3VD Vicor supply with internal uRAM). An external uRAM on the Vicor +3.3VD supply can be used with an decrease in Sigma (~8 counts). A possible compromise is to use a +3.3V voltage regulator at the point of load, driven from another +5VD Vicor RAMPAC (~ 6.5 counts Sigma).

3. Todd Moore for the DES CollaborationApril 3 rd, 20073 Noise Test Hardware Setup All noise test were done on shielded DHE conforming to FNAL specifications using FNAL video cable and CCD emulator. Power supply tests ran: 1.Linear supplies conneted to low-noise Monsoon 6-slot DHE. 2.Vicor supplies +5VD, +/-5VA, +/-15VA, & -28VA connected to Shielded Monsoon DHE. Linear supply +3.3VD is connected to low-noise Monsoon 6-slot DHE. 3.All Vicor supplies including unfiltered Vicor +3.3VD connected to low-noise Monsoon 6-slot DHE. 4.All Vicor supplies including Vicor +3.3VD and uRAM Filter connected to low-noise Monsoon 6-slot DHE. 5.All Vicor supplies including a +3.3v voltage regulator driven from Vicor +5VD and connected to low-noise Monsoon 6-slot DHE. Remote sensing was removed & local sensing added.

4. Todd Moore for the DES CollaborationApril 3 rd, 20074 Noise Test Software Setup Monsoon is running Fermilab focalplane with Monsoon Command Bar on cyclone:/home/monsoon/cfg/_fnal/. Code has been added to panSaver by Tao to automatically calculate the # of pixels, pedestal voltage (mean) and Sigma. Exposure can be run in continuous loop by using Labview code written by Inga. Short runs (.5Kx2K CCD) with Labview code were used to quickly analyze modifications to test stand. Long runs (2Kx4K CCD) were then used to get a more detailed analysis of the data. Long run readout analysis in panSaver uses 1,165,026 Pixels. Readout time is at 6uS/pixel. All hardware settings are based on Monsoon Command Bar selection: Cube, Front, Normal, 6us, and with either.5kx1k or 4kx2k size ccds. Channel 0 & 2 video inputs are used for readout. Data is also analyzed for a long run using./noiselast_prepost.sh to validate accuracy of calculated result in panSaver. Data is analyzed visually using DS9 or FV4.2.

5. Todd Moore for the DES CollaborationApril 3 rd, 20075 CCD test rack connects to earth ground thru power strip going to outlet & provides one point of reference for earth ground. Grounding strap connects Vicor case to rack to bring signal & earth grounds together. Analog & digital returns are connected to Vicor case to bring the returns to earth ground. The power supply analog & digital earth grounds are connected together at the Monsoon crate & at the case to tie earth grounds & signal grounds together. Earth Grounding & Shielding Schemes Notes

6. Todd Moore for the DES CollaborationApril 3 rd, 20076 Linear Supply Ground/Shield Scheme UofI Linear Power Supply Noise Study Test Stand Grounding Scheme EGND Analog Supplies: +/-15VA, +/-5VA, & -28VA Vout RTN EGND Vout RTN EGND A/C EGND A/C EGND Monsoon Backplane Monsoon Power Fanout Board Vdc GND/RTNs Vanalog Digital Supplies: +5VD, & +3.3VD Monsoon Case SHIELD Rack FNAL Video Cable Ins/Outs SHIELD FNAL CCD Emulator (Floating)

7. Todd Moore for the DES CollaborationApril 3 rd, 20077 Vicor Supply with Active Filter Ground/Shield Scheme UofI Vicor Power Supply w/ uRAM Noise Study Test Stand Grounding Scheme EGND Vicor Analog Supplies: +/-15VA, +/-5VA, & -28VA Vout RTN EGND Vout RTN EGND A/C EGND Monsoon Backplane Monsoon Power Fanout Board +5Vdc GND/RTNs Vanalog Vicor Digital Supply: +5VD, +3.3VD Monsoon Case SHIELD Rack FNAL Video Cable Ins/Outs SHIELD FNAL CCD Emulator (Floating) +3.3VD +5VD RTN Vout uRAM +3.3Vdc SHIELD

8. Todd Moore for the DES CollaborationApril 3 rd, 20078 Vicor Supply With Voltage Regulator Ground/Shield Scheme UofI Vicor w/ Vreg Power Supply Noise Study Test Stand Grounding Scheme EGND Vicor Analog Supplies: +/-15VA, +/-5VA, & -28VA Vout RTN EGND Vout RTN EGND A/C EGND Monsoon Backplane Monsoon Power Fanout Board +5Vdc GND/RTNs Vanalog Vicor Digital Supply: +5VD Monsoon Case SHIELD Rack FNAL Video Cable Ins/Outs SHIELD FNAL CCD Emulator (Floating) +3.3VDC Vreg +5VD +3.3Vdc SHIELD

9. Todd Moore for the DES CollaborationApril 3 rd, 20079 Linear Supply Test Results From panSaver Window Channel 0Channel 2 Test DateTest Stand SetupMeanRMSMeanRMSNotes/Results Test 1 14-Mar-07 Linear supplies are attached to the Shielded Monsoon DHE. +48van is not connected. See Linear Ground/Shield Scheme. 80,2015.5082,5115.60 Get a baseline measurement with shielded test stand attached to linear supply. Test 2 19-Mar-07 VICOR supplies are attached to the Shielded Monsoon DHE except +3.3VD is connected to LINEAR supply. +48van is not connected. FNAL Video cable & emulator is attached. 80,3045.6582,5935.56 Get a measurement with Vicor supply with filtered RAMPACs & +3.3VD linear supply. Test 3 20-Mar-07 Same as Test2, 15-Mar-07, except +3.3VD is connected to UNFILTERED VICOR supply. 80,30110.8082,59110.95 Get a measurement with shielded test stand attached to un-modified Vicor supply. Test 4 29-Mar-07 Same as Test 3, 15-Mar-07, except +3.3VD is attached to VICOR supply WITH URAM filter installed. See Vicor with Active Filter Ground/Shield Scheme 80,2428.0082,5768.12 Get a measurement with shielded test stand attached to Vicor supply including filtered +3.3VD. Test 5 29-Mar-07 Same as Test 2, 19-Mar-07 except +3.3VD is being generated by the VICOR +5VD with a VOLTAGE REGULATOR. See Vicor With Volt. Regulator Ground/Shield Scheme 80,2616.0882,5786.63 Get a measurement with Vicor supply and Volt. Regulated +3.3vd.

10. Todd Moore for the DES CollaborationApril 3 rd, 200710 Test Results with noiselast_prepost.sh Vicor Supply with Linear +3.3VDVicor Supply with unfiltered Vicor +3.3VD

11. Todd Moore for the DES CollaborationApril 3 rd, 200711 Vicor Supply with Filtered uRAM +3.3VD Test Results with noiselast_prepost.sh Vicor Supply with +3.3VD Voltage Regulator

12. Todd Moore for the DES CollaborationApril 3 rd, 200712 Conclusion/Next… Is the sigma low enough? –If so: Compare grounding/shielding schemes between Monsoon prototype system & low-noise test stand. Implement changes at FNAL and run more tests. Run more tests: –Run 2 channels @ 4uS/Pixel. –Run 1 ccd Acq. Board/8 channels @ 4uS. –Run 1 ccd Acq. Board/12 channels @ 4uS. –Run fully loaded DHE, 3 12 ch. CCD & 2 CBB boards/36 channels @ 4uS. –Load system down with lowest Vicor configuration to see if Sigma will lower with increased current load. –Implement suggestions from others to lower noise on +3.3VD.