Fabricating Liquid-Hydrogen Targets From Mylar Page: 1
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-1-
UCRL-9824
David L. Mehr
*
August 17. 1961
INTRODUCTION
(
Lawrence Radiation Laboratory
University of California
Berkeley. California
FABRICATING LIQUID- YDROCEN TARGErS FROM MYLAR’
Th* increasing popularity of liquid-hydrogen targets in physics
research has emphasized the need for containers with maximum beam
transparency <1.0 . thin walls and low Z) and suitable strength at cryogenic
temperatures. Fabrication of a Mylar container satisfying these re-
quirements is described here. Figure 1 shows the steps in assembly of a
target.
(
FORMING DOMES
Domes are formed by using Mylar1 under a combination of heat ane
pressure in a mold. Figure 2 shows the mold in vhich the domes are formed.
The thinner the Mylar. the less la me heat used and the shallower the mold,
the i--s pressure For example, if one uses a 7 5-mil sheet of Mylar, the
temperature should be about J5O°F before the pressure is applied. for two
sheets, the temperature should be about 375°F. The pressure used may vary
from 60 to 150 pat depending on the depth and diameter of the mold and the
thickness of the Mylar it is important that the pressure be increased very
slowly up to about 35 ps: for the single sheet, otherwise the sheet may burst
if the side radius of the mold is sharp, temperatures to 415°F and pressures
to 150 pat should be used for complete formation.
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Mehr, David L. Fabricating Liquid-Hydrogen Targets From Mylar, report, August 17, 1961; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1254680/m1/3/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.