aCORN Collaboration Meeting

1
aCORN Collaboration Meeting

• Electrostatic Mirror
• by A. Laptev

IUCF, Bloomington, IN March 26-27, 2008
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General Idea of the EM

• Both electrodes are thin wire grids
• Uniform electric field inside of EM volume
• Some supporting details

3
was transformed to nice Walters drawings
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The C-loaded PTFE as an electric boundary
condition shield of the EM
We have two 15 Carbon Molded Rod of 5.516"
(14cm) x 12" lg. (30.48 cm)
PTFE Properties Carbon loading
15 Electric resistivity 13 MOm Electric
current 0.5 µA _at_ HV
of 3 kV wall thickness of 1 mm
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Prototype of electric boundary condition shield
for the EM
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A suggested method of joining for two shielding
hollow cylinders of the EM
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Summary of neutron shielding materials for the EM
SWX-238 flexi-boron from Shieldwerx Standard
thickness 1/8 (3.2 mm) Total Density 1.64 g
/ cm Weight percent of all isotopes of boron
25.3 Boron atom density / cm3 2.32 x 1022
1/cm3 Boron Nitride Total Density 2.00 g /
cm3 Weight percent of all isotopes of boron in BN
43.6 Boron atom density / cm3 2.43 x 1022
1/cm3 Borosilicate glass (Pyrex) Total Density
2.23 g / cm3 Weight percent of all isotopes of
boron in Pyrex 4 Boron Density 0.09 g /
cm3 Boron atom density / cm3 0.497 x 1022 1/cm3
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Summary of neutron attenuation by different
shielding of the EM
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Boron Nitride as a neutron shielding for decay
volume of the EM
A BN sample was presented for picturing by Pieter
Mumm (NIST)
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Industrial respond on quotation request
Its based on drawing 307786-002rev12-18

• Flexi-boron looks like it is not stable in time
  all old samples indicated an oil leak
• Quotation for Boron Nitride 6,922 - 19,750
• Quotation for Borosilicate glass (Pyrex) 730
  (only from one company Pegasus Industrial
  Specialties Inc.)

11
New pattern for thin wires attachment to make a
grid for the EM (bottom view on grid frame)
Green is wire Red is proposed positions for
bolts to fix a wire
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Grids for the EM
I am ready to start first grid assembling as soon
as we will have grid frames to be ready.