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| | [[Pictures| Pictures of electrical connections on large prototype ]] | | [[Pictures| Pictures of electrical connections on large prototype ]] |
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| − | [[Preamp 2]] | + | [[CDC_Preamps| Preamps]] |
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| − | [[Preamp 3]]
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| − | ===== Preamp4 (GlueXdoc1364 Tbl 2 Row 2) =====
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| − | <div style="background:#e0f4fe">
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| − | This section (blue background) contains links to data obtained when our gas mixer was not operating reliably.
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| − | <br>
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| − | On June 23, we came to the conclusion that our <b>old</b> preamplifier <font color="red">bit the dust</font>. Detailed pictures showing how its performance has changed over the last several months are below. These clearly show that the gain increased by a factor of at least four and that there is substantially more noise. This later turned out to be confusion caused by a faulty mix of gas.
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| − | * [[CDC_old_preamp_then_and_now]]
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| − | *[[CDC old & new preamp noise scope trace study]]
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| − | * [[New hv-plateau/efficiency curve]]
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| − | * [[Drift time comparison (gas check)]]
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| − | The following link points to comparisons of cosmic data taken with the old preamplifier several months ago and with the new preamplifier. They clearly show that the signals (for the same gas and voltage settings) are larger with the new preamplifier.<br>
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| − | * [[Preamp 4: Comparison of cosmic data with original preamp]]
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| − | The following plots are taken using the new preamplifier with our FADC range decreased to match
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| − | the lower maximum output voltage from the new preamplifier (about 500mV). The old preamplifier
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| − | had a higher limit (~1V).<br>
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| − | * [[Preamp 4: Quick look at cosmic data with reduced fADC range]]
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| − | Based on the fact that our old preamplifier died, the following plots should not be used to make comparisons between the old and new preamplifier.
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| − | * [[Preamp 4|Preamp 4 : Comparison of 'scope traces with earlier preamps]]
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| − | * [[Preamp 4: Comparison of 55Fe data with original preamp]]
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| − | * [[Preamp 4: Comparison of 55Fe data with original preamp at lower voltage]]
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| − | * [[Preamp 4: 55Fe 'scope traces at lower voltage]]
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| − | <br>
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| − | (end of dodgy gas section)
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| − | </div>
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| − | <br>
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| − | * [[PreAmp tests with premixed gas]]
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| − | * [[Pedestal]]
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| − | * [[CDC_Preamplifier_Conclusion | Preamplifier Conclusions]]
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| − | * [[PreAmp_tests_with_premixed_90/10_Ar/CO2_-_software_threshold| Preamp tests with premixed 90/10 Ar/CO<sub>2</sub> - software threshold]]
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Revision as of 10:47, 15 December 2010
Simulations
dE/dx 350 MeV pions/protons
dE/dx 350 MeV pions/kaons/protons
dE/dx 250 MeV pions/kaons
H20 contamination tests
Old prototype
Photographs of the older, larger, CDC Prototype
New prototype
Energy/Amplitude as a function of drift time
Gas leak tests
Setup and tests
First signals
Gas mixture tests
Pictures of the prototype
Dimensions
Planned mechanical/construction tests
Resolutions
More resolution studies
Heated gas measurements
Electronics
ASIC meeting June 14, 2010
Charge division
Measuring Fe-55 X-rays with %2 interposer board
Electronic chain simulation
ASIC design optimizations
ASIC design optimizations tests writeup
Shaper gain
fADC timing
125 MHz Clock test
CDC High Voltage Board (HVB)
Pictures of electrical connections on large prototype
Preamps
Noise studies
