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Other projects
2019-2024

Multimeter probes with tweezers

original design by Roch S.
original design by Roch S.
my copy
my copy
10 MOhm probe
10 MOhm probe

Measuring thermal expansion of GRP tube

Glassfibre has been ordered from Excel [1] for the 20mK radiation shield.

Thermal expansion was measured by attaching a copper rod and putting it in liquid nitrogen dewar. At the length 630mm mutual displacement was 1.0mm (GRP shrinks less). Assuming thermal expansion for Cu is 0.302% we have GRP thernal expansion 0.143%. Note that GRP plastic sold in RS is a different material with larger thermal expansion.

[1] Universal Glassfibre tube 65/61 mm, L100 cm, Excel (~22EUR)
https://www.exelwebstore.com/catalog/product/view/id/979/s/universaltm-glassfibre-tube-65-61-mm-l100-cm.

Making low-temperature thermometers using Ohmite carbon resistors (02.2020)

resistors and first design of copper holders
resistors and first design of copper holders
grounded resistors
grounded resistors
annealing
annealing
thermometer + capacitor for RC filtering
thermometer + capacitor for RC filtering
glueing with black Stycast
glueing with black Stycast
ready for calibration
ready for calibration

Thermometers - next design of copper shells (07.2020)

annealing
annealing
glueing
glueing
mounting on the copper block for calibration
mounting on the copper block for calibration

Cell for Saba Khan (06.2021)

sinter (made by Saba)
sinter (made by Saba)

Coil system for levitating ball project (10.2021)

mirror holder
mirror holder
with coils
with coils
<a href="2020_misc/ball_coil_former.dxf">[dxf]</a>
[dxf]
<a href="2020_misc/ball_top_mirror.dxf">[dxf]</a>
[dxf]

Vibrating wire cells (05-06.2022)

<a href="2020_misc/20220503_cell_for_wires.dxf">[dxf]</a>
[dxf]
<a href="2020_misc/20220603_cell_v2.dxf">[dxf]</a>
[dxf]
dish for working with thin wires
dish for working with thin wires

Attemps for making hollow silver+solder balls (10.2022)

silver
silver

Cold amplifiers (04.2023)