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For the DECEMBER 1996 Review:  
Module Definition and Comparison of Performance
(Updated: 1996/11/29)
 
For each candidate MODULE we require:
 
(1) Drawings and parameters
 
A concise overview of the module:
 
  (a) Mechanical definition
 
  (b) Electrical powering and readout schemes
 
(2) Electrical performance
 
An "electrical working module" is defined to be
 
  (a) 12 cm strips
 
  (b) Hybrid to be instrumented with at least two-chip active readout 
channels (i.e. up to 256 ch.) reading out both sides (rphi and stereo) 
in the same event
 
2.1 Noise measurements:  R.M.S. noise, noise-occupancy at the 
threshold of 1 fC, and as a function of threshold (0 - 2 fC with 0.1 
fC step).  Measurements at the 1/4, 1/2, 3/4 locations in the pipeline 
to check for consistency.  
 
2.2 Source (Ru106, e.g.) measurements: 
 
   2.2.1 Pulse height measurement, and scan (with source) along and 
across the instrumented strips to check uniformity.  Pulse height is 
defined as the threshold of the 50 % efficiency point for the case of 
binary readout and as the peak of the Landau distribution for the case 
of analog readout.  
 
   2.2.2 Second noise measurement on two consecutive triggers.  The 
measurement should be done on data from the second trigger, as a 
function of the delay between the two.  The delay should cover the 
range of readout time of the first trigger.   
 
   Reference for a setup: http://scipp.ucsc.edu/~wichmann/IrrDetec/ 
 
 2.3 Delay Curve: vary calibration pulse with respect to pipeline 
clock to check for pickup effects (see talk of H.Sadrozinski in Oxford 
module group meeting).  
 
 
(3) Thermal performance
 
 3.1 Temperature measurement across a complete (thermal) module, 
mounted on a cooled support, for constant power in silicon (0, 1 
Watts) and chip (0, 3 Watts).  The measurement should be made in a
vacuum (if not, in a static air volume) with the coolant temperature
(approximately) equal to the ambient air temp. (0 C desirable, and if
not, around 20 C)
 
 3.2 Present a thermal finite element analysis and compare with the 
measurement.  
 
 3.3 Measurements with configurations that correspond to the presence 
of associated heating sources in the ATLAS SCT layout, e.g., heated 
hybrid directly underneath a tiled detector.  
 
 3.4 Simulation of thermal runaway with a finite element analysis.  
 
(4) Thermo-Mechanical performance
 (See "Module Specification" for tolerance numbers)
 
 4.1 Measure distortion as a function of chip power (0, 3 W), detector 
power (0, 1W), and possibly coolant and ambient temperatures at  +20, 
and -10 C (and +10, and 0 C if possible).  
 
 4.2 Compare the results with finite element analysis.  
 
 4.3 Extreme thermal cycles, carried out in a controlled manner over a 
period of 1 hr (-20 --> +70 C, five times) for the electrical modules 
and the thermo-mechanical modules.  Check for any change in the 
electrical performance and in the mechanical construction.  
 
  Thermal cycle: 20 min. cooling, 10 min. steady, 20 min warm-up, 10 
min steady (if this is inappropriate, please let us know)
 
 4.6 Demonstrate wire-bond ability for approximately the same number 
of wire-bonds.  Measure the pull strength of the wire-bonds in 
representative positions.  
 
(5) Radiation length
 
 5.1 Provide spreadsheet of materials, thicknesses, point radiation 
length, and averaged over 64 x 128 mm^2 area.  The sheet is to be 
itemized in the headings of 
	(1) Detector, 
	(2) FEE chips and electrical parts, 
	(3) Hybrid (excluding (2)),
	(4) Cabling, 
	(5) Mechanical parts (up to the contact to the cooling and  
		mechanical block), and 
	(6) Additional support needed for mechanics and cooling
 
 
(6) Construction/Assembly steps and Cost estimation
 
 6.1 Make a concise tabulation of the construction/assembly steps of 
the module.  Provide any drawings that help to explain these 
processes.  
 
 6.2 Estimate the total cost of the module with breakdown of major 
components, excluding the cost of detector, FEE chips and electrical 
parts. 
 
 6.3 Indicate briefly any features of the module that have particular 
implications for its operation both in the initial stage (i.e., 
fluence near zero) and in the later stage (fluence at about 1 x 10^14 
p/cm^2).  
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