Iiv measurements on sensor 2440 15d
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IIV measurements on Sensor 2440-15D. Ray & Gwen 07/05/23. OUTLINE: Sensor detail Measurement Circuit, corrected Probe station measurements IIV – vary P (Room T, Lo T) IIV – vary T (Lo P) IIV – vary t (stability). Reminder : Liverpool data on 2440-15D. Connections in the vacuum system.

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Iiv measurements on sensor 2440 15d

IIV measurements on Sensor 2440-15D

Ray & Gwen

07/05/23

  • OUTLINE:

  • Sensor detail

  • Measurement Circuit, corrected

  • Probe station measurements

  • IIV – vary P (Room T, Lo T)

  • IIV – vary T (Lo P)

  • IIV – vary t (stability)



Connections in the vacuum system
Connections in the vacuum system

Was triax-to-coax adapter here –

Not true anymore: now triax-to-banana


Q when is a short not a short
Q. When is a short not a short?

ADAPTER: TRIAX -to- COAX

A. When it is this thing – this adapter added a “diode”-like short behavior above 150 V. (Why?)



Iiv @ 21 4c varying p

RT

vary P

IIV @ 21.4C – varying P

  • 4.3e-5 mbar

  • 6.2e-5 mbar

  • 1.1e-4 mbar

  • 3.3e-4 mbar

  • 6.6e-4 mbar

  • 9.9e-4 mbar

  • 3.4e-3 mbar

  • 6.7e-3 mbar

  • 8.9e-3 mbar

Bulk Current

Guard Ring Current

All points are averages over 5 msrmts per point

Pressure variation under +/- 0.1, temp variation under 0.2 C max-min each dataset


Iiv @ 21 4c zoom bulk

RT

vary P

IIV @ 21.4C (zoom: bulk)

  • 4.3e-5 mbar

  • 6.2e-5 mbar

  • 1.1e-4 mbar

  • 3.3e-4 mbar

  • 6.6e-4 mbar

  • 9.9e-4 mbar

  • 3.4e-3 mbar

  • 6.7e-3 mbar

  • 8.9e-3 mbar


Iiv @ 21 4c zoom guard ring

RT

vary P

IIV @ 21.4C (zoom: guard ring)

  • 4.3e-5 mbar

  • 6.2e-5 mbar

  • 1.1e-4 mbar

  • 3.3e-4 mbar

  • 6.6e-4 mbar

  • 9.9e-4 mbar

  • 3.4e-3 mbar

  • 6.7e-3 mbar

  • 8.9e-3 mbar

(?)


Current vs pressure @ 100 v

RT

vary P

Current vs Pressure @ 100 V

“diode region”

No overall trend, but maybe small enhancement?

T very stable around 21.35 C, DT under 0.2 C max-min for each dataset


Current vs pressure @ 300 v

RT

vary P

Current vs Pressure @ 300 V

“ohmic region”

No overall trend, but maybe small enhancement?

T very stable around 21.35 C, DT under 0.2 C max-min for each dataset


Iiv @ 9 5c varying p

Lo T

vary P

IIV @ -9.5C – varying P

  • 3.4e-5 mbar, -9.47C

  • 1.1e-4 mbar, -9.49C

  • 3.0e-4 mbar, -9.44C

  • 6.5e-4 mbar, -9.43C

  • 1.0e-3 mbar, -9.50C

  • 3.2e-3 mbar, -9.48C

  • 6.5e-3 mbar, -9.57C

  • 9.2e-3 mbar, -9.48C

Bulk Current

Guard Ring Current

All points are averages over 5 msrmts per point

Pressure variation under +/- 0.1, temp variation under 0.5 C max-min each dataset


Iiv @ 9 5c zoom

Lo T

vary P

IIV @ -9.5C (zoom)

  • 3.4e-5 mbar, -9.47C

  • 1.1e-4 mbar, -9.49C

  • 3.0e-4 mbar, -9.44C

  • 6.5e-4 mbar, -9.43C

  • 1.0e-3 mbar, -9.50C

  • 3.2e-3 mbar, -9.48C

  • 6.5e-3 mbar, -9.57C

  • 9.2e-3 mbar, -9.48C


Current vs pressure @ 100 v1

Lo T

vary P

Current vs Pressure @ 100 V

“diode region”

Trend?

T very stable around -9.5 C, DT under 0.5 C max-min for each dataset


Current vs pressure @ 300 v1

Lo T

vary P

Current vs Pressure @ 300 V

“ohmic region”

Trend?

T very stable around -9.5 C, DT under 0.5 C max-min for each dataset


Iiv @ 3e 5 mbar varying t

vary T

Lo P

IIV @ 3e-5 mbar – varying T

16 runs shown here – adiabatic temp rise (7 sequential plus ½ h delay remainder)


Current vs temperature @ 100 v

vary T

Lo P

Current vs Temperature @ 100 V

“diode region”

Should be: factor ~2 for 10 C

See:

factor ~2 for 30 C

Plus: kink !

(?)


Current vs temperature @ 300 v

vary T

Lo P

Current vs Temperature @ 300 V

“ohmic region”

See:

factor ~1.4 for 30 C

Plus: kink

(?)


Stability @ 3e 5 mbar 21 4c

RT

Lo P

Stability @ 3e-5 mbar & 21.4C

16 runs shown here – taken with ½ h delay between


Stability @ 3e 5 mbar 21 4c @ 300v

RT

Lo P

Stability @ 3e-5 mbar & 21.4C @ 300V

“ohmic region”

8 hr


Stability @ 1e 3 mbar 21 4c

RT

Med P

Stability @ 1e-3 mbar & 21.4C

20 runs shown here – taken with ½ h delay between


Stability @ 1 0e 3 mbar 21 4c @ 300v

RT

Med P

Stability @ 1.0e-3 mbar & 21.4C @ 300V

“ohmic region”

10 hr


Next

  • IV with floating guard ring in the probe station (for comparison with L’Pool DB)

  • CV for this sensor…

  • Next sensor : 2440-09E

  • Then: pick a p-type





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