Status as of 3/31/97 from David Kirkby:
Date: Mon, 31 Mar 1997 13:30:50 -0800 (PST)
From: David Kirkby <kirkby@hep.Stanford.EDU>
Subject: re: beam pipe material
The beampipe material budget in the simulation (both
BBSIM and ASLUND) is up to date, and currently stands at 1.03% X0 at 90
degrees. The beampipe package test job performs a material scan at
several polar angles, giving the breakdown for different beampipe layers:
*** Interaction-Region Material Scan:
VTX= ( .000, .000, .000) cm
THETA= 1.571 rad , PHI= .000 rad
RADIUS ABS(Z) TOT X0 ENTERING VOL (MEDIUM:MATERIAL)
cm cm %
.0000 .0000 .00000 PIPV (bp-magvac:VACUUM)
2.4995 .0000 .00000 PIPF (bp-paint:bp-gold)
2.5000 .0000 .14633 PIP1 (bp-beryll:BERILLIUM)
2.5800 .0000 .37293 PIPI (bp-liner:bp-nickel)
2.5807 .0000 .42136 PIP2 (bp-water:bp-H2O)
2.7293 .0000 .83690 PIPO (bp-liner:bp-nickel)
2.7300 .0000 .88532 PIP1 (bp-beryll:BERILLIUM)
2.7800 .0000 1.02693 PIPE (Air:AIR)
3.0000 .0000 1.02766 BFAC (BB Detector:AIR)
* exited the BPMO volume at ( 3.000, .000, .000)
The most recent version of this scan is always available in the test
output file: $BFDIST/releases/newest/gnbpip/test/AIX4-test.log. The
thicknesses of gold and nickel might still change at the few micron level,
but otherwise I think the design is stable.
David
