Minutes Run IIB Silicon Sensor Meeting,
These minutes can be found at:
http://d0server1.fnal.gov/projects/run2b/Silicon/www/smt2b/Documentation/minutes/minutes_Mar13_03.html
Agenda
ü
News / Status George
/ Marcel
ü
New Analogue Cables Frank
Lehner
ü Update Flux Normalization Tim Bolton
ü Status Layer 0/1 sensor tests Regina Demina
ü Comparison test results with HPK Sergey Korjenevski
ü
Plan for layer 0/1 PRR all
News / Status (George, Marcel)
o
The
Production Readiness Reviews for the outer layer sensors was held the previous
week on
http://www.physik.unizh.ch/~lehnerf/dzero/prr/prr_l2.html
Analogue Cables
(Frank Lehner)
o
Frank brought a new batch of 40
analogue cables from Dyconex. Please note that this
is an in-kind contribution from the
o
Dyconex also has a proposal for laminating the cables. They
produced a special ‘mesh’ cable, which are kapton
cables with holes of radius 60 mm. The cables come in three varieties: hole-distance 190,
210 and 230 mm,
which corresponds to an er ~1.95, 2.2 and 2.45. All mechanical details need to be
understood before we can decide to accept this lamination proposal. We should
aim for finalizing the analogue cable design sometime in June.
Update flux Normalization (Tim Bolton)
o http://d0server1.fnal.gov/projects/run2b/Silicon/www/smt2b/Documentation/minutes/TB_Radiation Test Status.pdf
o A main issue during the sensor PRR was the flux normalization. The results from the irradiation tests gave a value for a of 1, whereas the expected value is 3. An error was made in the normalization to area. The area of L1 sensors was used rather than the area of the Layer 2 sensors, which gives a factor of 2. A set of cross checks was made at KSU
o Flux calculation from Faraday cup was cross checked and found to be okay.
o Fluence will also be independently measured using a Cu foil.
o The hypothesis of the protons “channeling” through the Si was studied by positioning the sensors at an angle. No effect observed.
o
Hardness parameter k uncertainty.
A value of 3.87 from a model calculation was used, though there is some
indication from the
o Work will continue.
Status Layer 0/1 Sensor Test
Results (
o See March 20 presentation and below
Comparison Test Results with
o
There
are 15 ELMA layer 1 sensors. Of these, 4 are mechanical, 7 are from the first
batch and 4 from the second batch. Three
o The grading of the two vendors, ELMA and HPK, gave an overall electrical grade of 1.33 to ELMA and 1.9 to HPK. The sensor with the bad strips is the only sensor that receives a grade less than 2.
Link to the Run IIb silicon page
http://d0server1.fnal.gov/projects/run2b/Silicon/www/smt2b/smt2b.html
Links to minutes archive
http://d0server1.fnal.gov/projects/run2b/Silicon/www/smt2b/Documentation/Minutes/minutes_silicon.htm