Stanford Synchrotron Radiation Laboratory activity report for 1987 Page: 38 of 360
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IV ENGINEERING DIVISION
MECHANICAL ENGINEERING
An appreciable portion of the effort of the Mechanical
Engineering group is devoted to design of new beam
lines. In 1987, work was carried out on PEP Beam
Line 1B, SPEAR Beam Lines VIII and X and the
Beam Line V monochromator. All of these activities
are described in the preceding chapter.
Work Completed in 1987 - Work completed includes:
1) the design of a "pin hole" device used as a diag-
nostic tool in PEP Beam Line 1 B, 2) SSRL specific
additions to the new SLAC Vacuum Specification, 3)
the qualification of a new non-circular UHV sealing
method developed at LBL, and 4) design of a fo-
cussing mirror following the monochromator on
Branch Line IV-3.
The PEP "pin hole" allows one to image the x-ray
source, and in combination with a scanning pinhole
and the monochromator in the hutch, provides a
method of producing a series of planar monochro-
matic maps of flux distribution.
The new LBL noncircular seal consists of a copper or
aluminum seal with an "x" cross-section that is
crushed into the corners of conventional o-ring
grooves. Mating flanges need not be of similar
materials, allowing a match of aluminum to stainless
steel. The sealing system is currently in use at LBL,
and will be used on a large rectangular flange on the
mirror tank for Branch Line VI-1. Vacuum perform-
ance is similar to the conventional conflat flange.
Beryllium Window and Hybrid Wiggler Power Studies
- The ME group, in collaboration with the SSRL X-
Ray group, is conducting experiments to measure the
temperature distribution on the first beryllium window
and the power output of Beam Line VI. An infra-red
camera recorded the temperature field on the win-
dow, and change in cooling water temperature near
the window was used to determine approximately the
power absorbed by the beryllium. Photon flux was
also measured in the experimental hutch. Results so
far indicate that the total power output of the wiggler
appears to be lower than expected.
Lawrence Livermore National Laboratories produced
temperature fields on sample beryllium windows with
a calibrated laser welder. [Holdner, F.R., et al. "ThermalDamage Study of Beryllium Windows used as Vacuum
Barriers in Synchrotron Radiation Beamlines", LLNL Report
UC/D-21179 (September 1987)]. Temperature fields
were measured with an infra-red camera and
checked with thermocouples. Laser power levels
were increased until the beryllium foil failed.
The ME group at SSRL, using LLNL power distribu-
tions and finite element methods, reproduced the
experimental temperature distributions, thus verifying
the finite element models used in window thermal
predictions.
In 1988, the Mechanical Engineering and X-Ray
groups will design and install an accurate calorimeter
to determine the beam power following the beryllium
window module. This instrument may also be
installed on Beam Line X to determine its total power
output.
Thermal-Structural Analysis - SSRL is now conduct-
ing almost all of its finite element analysis on PC's.
The Engineering group has two Compaq 386's with
80387 floating point processors, running a thermal-
structural analysis package from Algor Interactive
Systems. This package includes a model drafting
package, as well as accepting output from Cadkey,
the SSRL standard drafting program. The Compaq
has been used to run models of 5 to 6 thousand
degrees of freedom in the space of 5 to 6 hours.
Larger models can be run on the VAX at SSRL using
similar programs from the same company. The
Compaq/Algor combination has been used to exam-
ine the temperature and stress distributions on
beryllium windows, crotches, masks, and mirrors.
Computer Aided Design - The Mechanical Engineer-
ing group now has two PC's dedicated to mechanical
design and drafting; a Compaq 386 and an IBM AT
clone. Three designers are now able to use these
machines.
The designs of the PEP pin hole device and the
XAFS hutch on Beam Line X-2 were done exclusively
on the Mechanical Engineering CAD stations. Future
efforts, such as the Beam Line II rework and Beam
Line X-1 branch line design, will also be done on the
CAD systems.SSRL ACTIVITY REPORT 1987
Page 27
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Robinson, S. & Cantwell, K. Stanford Synchrotron Radiation Laboratory activity report for 1987, report, December 31, 1988; Stanford, California. (https://digital.library.unt.edu/ark:/67531/metadc667833/m1/38/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.