Difference between revisions of "Spot size 23-11-2021"

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On this page you will find the spot size measurments performed on 23 november 2021 by Emily, Marjolein and Casimir.  
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On this page you will find the spot size measurments performed on 23 november 2021 by Emily, Marjolein and Casimir. Spotsizes were measured by tracing the beam shape on white paper in a cardboard holder placed inside the beam. Three different tracings were measured at each distance to get a more accurate measurement. The beam is a purple square shape dot with soft borders, these soft borders make the dot difficult to trace. The measurements were performed with the exit slit opened 3.05 (mm) and the entrance slit opend 1.65 (mm) and the slits also have a square shape.
 
== Measurement table ==
 
== Measurement table ==
 +
The distance in the table is measured to the inside of the vacuum chamber. To get the distance to the slit, 94 mm needs to be added to the distance in the table. See the measurement notes at the bottom of the page for the original.
 +
{| class="wikitable"
 +
!colspan="4"|Measurements Exit 3.05(mm) Entrance 1.65 (mm)
 +
|-
 +
|Distance (mm)
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|Measurer
 +
|Horizontal (mm)
 +
|Vertical (mm)
 +
|-
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|rowspan="4" style="text-align:center;"|103 ± 1
 +
|Casimir
 +
| style="text-align:center;"|6.8 ± 0.2
 +
| style="text-align:center;"|9.1 ± 0.2
 +
|-
 +
|Emily
 +
| style="text-align:center;"|7.7 ± 0.2
 +
| style="text-align:center;"|9.5 ± 0.2
 +
|-
 +
|Marjolein
 +
| style="text-align:center;"|7.7 ± 0.2
 +
| style="text-align:center;"|9.5 ± 0.2
 +
|-
 +
!|Average
 +
!|7.4 ± 0.2
 +
!|9.4 ± 0.2
 +
|-
 +
|rowspan="4" style="text-align:center;"|126 ± 1
 +
|Casimir
 +
| style="text-align:center;"|7.5 ± 0.2
 +
| style="text-align:center;"|9.9 ± 0.2
 +
|-
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|Emily
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| style="text-align:center;"|6.9 ± 0.2
 +
| style="text-align:center;"|10.4 ± 0.2
 +
|-
 +
|Marjolein
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| style="text-align:center;"|6.5 ± 0.2
 +
| style="text-align:center;"|12.1 ± 0.2
 +
|-
 +
!|Average
 +
!|7.0 ± 0.2
 +
!|10.9 ± 0.2
 +
|-
 +
|rowspan="4" style="text-align:center;"|162 ± 1
 +
|Casimir
 +
| style="text-align:center;"|7.0 ± 0.2
 +
| style="text-align:center;"|12.3 ± 0.2
 +
|-
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|Emily
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| style="text-align:center;"|8.9 ± 0.2
 +
| style="text-align:center;"|12.7 ± 0.2
 +
|-
 +
|Marjolein
 +
| style="text-align:center;"|8.1 ± 0.2
 +
| style="text-align:center;"|12.0 ± 0.2
 +
|-
 +
!|Average
 +
!|8.0 ± 0.2
 +
!|12.3 ± 0.2
 +
|-
 +
|rowspan="4" style="text-align:center;"|175 ± 1
 +
|Casimir
 +
| style="text-align:center;"|9.1 ± 0.2
 +
| style="text-align:center;"|11.4 ± 0.2
 +
|-
 +
|Emily
 +
| style="text-align:center;"|8.8 ± 0.2
 +
| style="text-align:center;"|11.7 ± 0.2
 +
|-
 +
|Marjolein
 +
| style="text-align:center;"|6.8 ± 0.2
 +
| style="text-align:center;"|13.7 ± 0.2
 +
|-
 +
!|Average
 +
!|8.2 ± 0.2
 +
!|12.3 ± 0.2
 +
|-
 +
|rowspan="4" style="text-align:center;"|232 ± 1
 +
|Casimir
 +
| style="text-align:center;"|10.9 ± 0.2
 +
| style="text-align:center;"|18.0 ± 0.2
 +
|-
 +
|Emily
 +
| style="text-align:center;"|10.6 ± 0.2
 +
| style="text-align:center;"|15.9 ± 0.2
 +
|-
 +
|Marjolein
 +
| style="text-align:center;"|13.7 ± 0.2
 +
| style="text-align:center;"|14.9 ± 0.2
 +
|-
 +
!|Average
 +
!|11.7 ± 0.2
 +
!|16.3 ± 0.2
 +
|-
 +
|rowspan="4" style="text-align:center;"|251 ± 1
 +
|Casimir
 +
| style="text-align:center;"|10.8 ± 0.2
 +
| style="text-align:center;"|18.2 ± 0.2
 +
|-
 +
|Emily
 +
| style="text-align:center;"|11.6 ± 0.2
 +
| style="text-align:center;"|15.2 ± 0.2
 +
|-
 +
|Marjolein
 +
| style="text-align:center;"|12.8 ± 0.2
 +
| style="text-align:center;"|16.6 ± 0.2
 +
|-
 +
!|Average
 +
!|11.7 ± 0.2
 +
!|16.7 ± 0.2
 +
|}
 +
[[File:Beamsize.png|alt=|frameless|700x700px]]
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 +
== Conclusions ==
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The beam diverges inside the sample chamber, this is expected behaviour, although we would expect a more linear behaviour. The size of the beam is larger than antisipated in previously done measurements and calculations. Therefore, one should consider to close the slits more in future experiments to reduce the size of the beam.
 +
 +
[[Media:Measurment notes.pdf|Measurement notes]]

Latest revision as of 15:28, 29 August 2022

On this page you will find the spot size measurments performed on 23 november 2021 by Emily, Marjolein and Casimir. Spotsizes were measured by tracing the beam shape on white paper in a cardboard holder placed inside the beam. Three different tracings were measured at each distance to get a more accurate measurement. The beam is a purple square shape dot with soft borders, these soft borders make the dot difficult to trace. The measurements were performed with the exit slit opened 3.05 (mm) and the entrance slit opend 1.65 (mm) and the slits also have a square shape.

Measurement table

The distance in the table is measured to the inside of the vacuum chamber. To get the distance to the slit, 94 mm needs to be added to the distance in the table. See the measurement notes at the bottom of the page for the original.

Measurements Exit 3.05(mm) Entrance 1.65 (mm)
Distance (mm) Measurer Horizontal (mm) Vertical (mm)
103 ± 1 Casimir 6.8 ± 0.2 9.1 ± 0.2
Emily 7.7 ± 0.2 9.5 ± 0.2
Marjolein 7.7 ± 0.2 9.5 ± 0.2
Average 7.4 ± 0.2 9.4 ± 0.2
126 ± 1 Casimir 7.5 ± 0.2 9.9 ± 0.2
Emily 6.9 ± 0.2 10.4 ± 0.2
Marjolein 6.5 ± 0.2 12.1 ± 0.2
Average 7.0 ± 0.2 10.9 ± 0.2
162 ± 1 Casimir 7.0 ± 0.2 12.3 ± 0.2
Emily 8.9 ± 0.2 12.7 ± 0.2
Marjolein 8.1 ± 0.2 12.0 ± 0.2
Average 8.0 ± 0.2 12.3 ± 0.2
175 ± 1 Casimir 9.1 ± 0.2 11.4 ± 0.2
Emily 8.8 ± 0.2 11.7 ± 0.2
Marjolein 6.8 ± 0.2 13.7 ± 0.2
Average 8.2 ± 0.2 12.3 ± 0.2
232 ± 1 Casimir 10.9 ± 0.2 18.0 ± 0.2
Emily 10.6 ± 0.2 15.9 ± 0.2
Marjolein 13.7 ± 0.2 14.9 ± 0.2
Average 11.7 ± 0.2 16.3 ± 0.2
251 ± 1 Casimir 10.8 ± 0.2 18.2 ± 0.2
Emily 11.6 ± 0.2 15.2 ± 0.2
Marjolein 12.8 ± 0.2 16.6 ± 0.2
Average 11.7 ± 0.2 16.7 ± 0.2

Conclusions

The beam diverges inside the sample chamber, this is expected behaviour, although we would expect a more linear behaviour. The size of the beam is larger than antisipated in previously done measurements and calculations. Therefore, one should consider to close the slits more in future experiments to reduce the size of the beam.

Measurement notes

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