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Summary of Serially Powered Stavelet Results and Future Directions

This overview discusses results of Serially Powered Stavelet experiments, focusing on noise performance, module configurations, and power bus probing. It also outlines ideas for improving noise targets and enhancing system efficiency in parallel. The study analyzes the impact of various configurations on noise reduction and suggests potential modifications for optimal performance.

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Summary of Serially Powered Stavelet Results and Future Directions

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  1. Overview of Resultsfrom Electrical Stavelets Peter W Phillips et al 13/07/2011

  2. Serially Powered Stavelet H0 H1 H2 H3 H4 H5 H6 H7 EoS DC-DC Stavelet

  3. 8th July 2011 Serially Powered Stavelet Jan Stastny Current Source at 5A, 230V bias, ALL MODULES ON

  4. 8th July 2011 Serially Powered Stavelet Double Trigger Noise: Basic Metric 1722-7: Columns 0-3 at 0.75fC 1722-8: Columns 0-3 at 0.50fC Sum(hits): simply sum the number of hits shown in each double trigger plot 220052 599661 262759 630266 0 88 0 78

  5. 20th May 2011 Serially Powered Stavelet Double Trigger Noise: Basic Metric L1A over COM, no additional delay (run 1580) Sum(hits) SP- SP+ Hybrid

  6. Serially Powered Stavelet SP Stavelet Summary • Good ENC noise performance • Can bypass individual hybrids under DCS control (PPB / 1-wire) • Excess noise occupancy correlated with readout, notably “even” hybrids Have explored lots of ideas with single SP modules and/or the stavelet • Extra decoupling (helps a bit) • Improved referencing • Second backplane connection • Alternate shunt control circuits • M shunt plugin, SPP-COB chip Studies with a single module show that the double trigger noise is reduced if both hybrids on a detector sit at the same DC potential (see Tony’s talk) • Proposal is to convert stavelet from a “chain of hybrids” to a “chain of modules” • Maybe just build a new one? • Likely to give us a Serially Powered stavelet which meets required noise targets • Not as efficient as a “chain of hybrids”, should continue to work toward that in parallel

  7. DC-DC Stavelet 12thJuly 2011 Stavelet + 47uF: One hybrid at a time 12thJuly 2011 Stavelet + 47uF: Both hybrids at once Single Module Reference Result

  8. 12thJuly 2011 DC-DC Stavelet Double Trigger Noise: Basic Metric 1730-7: Columns 0-3 at 0.75fC 1730-8: Columns 0-3 at 0.50fC Sum(hits): simply sum the number of hits shown in each double trigger plot 15 2898 4 2442 0 9 0 85

  9. DC-DC Stavelet DC-DC Stavelet Summary • BetterDouble Trigger Noise performance • Can disable/re-enable hybrids under DCS control (1-wire) • Performance of H0 not yet satisfactory • Contrary to an earlier successful test of a stavelet module powered by STV DC-DC converters, initial results on the stavelet were not encouraging • Explored B field mapping and extra shielding • Minimal effect • Explored improved ground referencing • Minimal effect (but maybe did not go far enough) • Explored frequency spectrum of noise on the DC-DC power bus • Artefacts from converters and peaks from other sources such as HSIO • Latest result achieved by the addition of capacitors to the power bus • Still investigating ways to recover the performance of H0

  10. BACKUP

  11. DC-DC Stavelet Probing the power bus: up to 2MHz Power ON H0 + H1 + H2 active Power ON H0 + H1 + H2 active 47uF held at location H4 These measurements were made using an 800 MHz bandwidth diff probe located at the position where “H3” would normally be connected

  12. DC-DC Stavelet Naked Converters! Converter 06: BC0000000476043A Converter 14: 7C0000000455D23A

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