Large Detector, Intermediate Tracker, very rough first draft cost estimates

Updated following telephone meeting of 20 April 2000

Silicon

BASELINE: 1 double-sided silicon microstrip layer (r-phi, r-z)
Radius = 48 cm (~inside radius of TPC)
Half-length = 29.5 cm (out in z to the first silicon disk)
sigma_rphi = sigma_rz = 7 microns

Units in $1000.  Attempts to scale from Bruce's numbers.
Channel count goes with resolutions
Active area ~1.8 m2 c.f. ~36 m2 of small detector barrel.
Assume cheaper LST? Yes.

Units of $1k
 
 
System
 Cost
1.  Enclosures/Supports
$150
2. Space Frame
$300
3. Mechanical Assembly
$250
4. Power Cables
$63
5.  Internal Alignment and monitoring
$250
6. Mechanical Integration
$500
7. Detectors, $20/cm2
$360
8. Front-end Electronics $0.30/chan + $100 R&D, 800k chans. - non-WBS item
$1240
9. Hybrids
$400
10. Data Transmission
$400
11. External Mechanical
$50
12. Final Assembly and Alignment
$250
13. Commissioning
$200
TOTAL WBS Items
$3173
Grand TOTAL including non-WBS item #8
$4413

 

Scintillating Fibers

PROPOSED ADDITION/REPLACEMENT? Scintillating fibers - ~230 micron individual
resolution r-phi, ~115 um combined, ~1 nsec _timing_ resolution, complementary for
bunch time id.

Single carbon fiber barrel, fibers 800 um diameter,
Two layers axial, two layers 3 deg. stereo
Readout by visible light photon counters + SVXII

Radius = 48 cm (~inside radius of TPC) or just inside silicon barrel above - combine mechanics?
Half-length = 29.5 cm (out in z to the first silicon disk)

Extrapolating from DO Upgrade system (8 cylinders, r=19 cm to 50 cm, 77k chan)

Units of $1k.
 
 
System
Cost
1.  Scintillating fiber ribbons
$120
2.  Mechanical support (carbon fiber cylinder) and services
$75
3. Clear Waveguides
$150
4. Calibration
$100
5. Detector Assembly & Prototyping
$250
6. VLPC's and cassettes
$500
7. VLPC Cryogenics
$80
8. Fiber Readout (SVXII and support electronics, data trans.) non-WBS
$200
TOTAL WBS Items
$1,275
Grand TOTAL including non-WBS item #8
$1,475

Electronics cluster counts:
 
System
Count
15,000 optical channels
8 chan/VLPC (visible light photon counter)
1875
16 chan/SIFT (custom IC for VLPC's, preamp, discriminator)
940
64 chan/SVXII (ADC)
235
512 chan/Front End board
30

Straw Tubes

Multiple layers of straw? Transition radiation?
Can scale ATLAS/BTeV


 
 
Copyright 1996, The Trustees of Indiana University
Last updated: 19 April 2000
URL: http://needmore.physics.indiana.edu/~rickv/nlc/inter_tracker.html
Comments: rickv@paoli.physics.indiana.edu
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