overview of results from electrical stavelets
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Overview of Results from Electrical Stavelets. Peter W Phillips et al 13/07/2011. Serially Powered Stavelet. H0 H1 H2 H3 H4 H5 H6 H7 EoS. DC-DC Stavelet. 8 th July 2011. Serially Powered Stavelet. - PowerPoint PPT PresentationTRANSCRIPT
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Overview of Resultsfrom Electrical Stavelets
Peter W Phillips et al13/07/2011
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Serially Powered Stavelet
DC-DC Stavelet
H0 H1 H2 H3 H4 H5 H6 H7 EoS
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Jan Stastny Current Source at 5A, 230V bias, ALL MODULES ON
8th July 2011Serially Powered Stavelet
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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
262759
0
0
599661
630266
88
78
Serially Powered Stavelet 8th July 2011
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Double Trigger Noise: Basic Metric
0 2 4 6 8 10 12 14 160
200000
400000
600000
800000
1000000
1200000
1.00fC0.75fC0.50fC
SP- SP+
Sum(hits)
Hybrid
L1A over COM, no additional delay (run 1580)
Serially Powered Stavelet 20th May 2011
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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
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DC-DC Stavelet
Single Module Reference Result
12th July 2011Stavelet + 47uF:
One hybrid at a time
12th July 2011Stavelet + 47uF:
Both hybrids at once
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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
4
0
0
2898
2442
9
85
DC-DC Stavelet 12th July 2011
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DC-DC Stavelet Summary Better Double 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
DC-DC Stavelet
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BACKUP
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Probing the power bus: up to 2MHz
These measurements were made using an 800 MHz bandwidth diff probelocated at the position where “H3” would normally be connected
Power ONH0 + H1 + H2 active
Power ONH0 + H1 + H2 active
47uF held at location H4
DC-DC Stavelet
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Naked Converters!Converter 06: BC0000000476043A Converter 14: 7C0000000455D23A
DC-DC Stavelet
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