Difference between revisions of "Fe55 peak shape"

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Mixed 50/50 at 40 sccm total, moved the source (collimated as usual) across the top of the straw towards the edge....
 
Mixed 50/50 at 40 sccm total, moved the source (collimated as usual) across the top of the straw towards the edge....
−
 
+
With the source over the edge of the straw, the count rate halves and the camel disappears.
 
{| border="0" cellpadding="2"
 
{| border="0" cellpadding="2"
 
|width="400pt"|
 
|width="400pt"|
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With the source over the edge of the straw, the count rate halves and the camel disappears.
+
 
  
  
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|width="400pt"|
 
|width="400pt"|
 
[[Image:source_pos_hv_e.png|thumb|400px|energy histo for 55Fe mixed 50/50 at 80 sccm]]
 
[[Image:source_pos_hv_e.png|thumb|400px|energy histo for 55Fe mixed 50/50 at 80 sccm]]
 +
|}
 +
 +
 +
Repeated at 60 sccm
 +
 +
{| border="0" cellpadding="2"
 +
|width="400pt"|
 +
[[Image:edge_60_a.png|thumb|400px|max amplitude histo for 55Fe mixed 50/50 at 60 sccm ]]
 +
|width="400pt"|
 +
[[Image:edge_60_e.png|thumb|400px|energy histo for 55Fe mixed 50/50 at 60 sccm]]
 +
|}
 +
 +
Events histograms with the source above the wire.
 +
{| border="0" cellpadding="2"
 +
|width="300pt"|
 +
[[Image:events60_c_1850.png|thumb|300px|55Fe events, mixed 50/50 at 60 sccm, 1850V ]]
 +
|width="300pt"|
 +
[[Image:events60_c_1950.png|thumb|300px|55Fe events, mixed 50/50 at 60 sccm, 1950V ]]
 +
|width="300pt"|
 +
[[Image:events60_c_2050.png|thumb|300px|55Fe events, mixed 50/50 at 60 sccm, 2050V ]]
 +
|}
 +
 +
Events histograms with the source off the wire (above the edge of the tube).
 +
{| border="0" cellpadding="2"
 +
|width="300pt"|
 +
[[Image:events60_e_1850.png|thumb|300px|55Fe events, mixed 50/50 at 60 sccm, 1850V ]]
 +
|width="300pt"|
 +
[[Image:events60_e_1950.png|thumb|300px|55Fe events, mixed 50/50 at 60 sccm, 1950V ]]
 +
|width="300pt"|
 +
[[Image:events60_e_2050.png|thumb|300px|55Fe events, mixed 50/50 at 60 sccm, 2050V ]]
 +
|}
 +
 +
 +
90/10 Ar/CO<sub>2</sub> (premixed) at approx 80 sccm<br>
 +
The light coloured plots were produced with the 55Fe source centred over the wire; for the darker plots the source was
 +
close to the side of the tube.
 +
The operating voltage for that mix was previously chosen to be 1450V.  Afterpulses are present at 1550V (delayed, so are not included in the integration).  The count rate decreased by approx 1/3 when moving the source to the side of the tube - with the 50/50 gas mix the count rate decreased by at least 1/2.
 +
{| border="0" cellpadding="2"
 +
|width="400pt"|
 +
[[Image:edge_9010_80_a.png|thumb|400px|max amplitude histo for 55Fe premixed 90/10 at ~80 sccm ]]
 +
|width="400pt"|
 +
[[Image:edge_9010_80_e.png|thumb|400px|energy histo for 55Fe premixed 90/10 at ~80 sccm]]
 +
|}
 +
90/10 premix at very approx 100 sccm<br>
 +
{| border="0" cellpadding="2"
 +
|width="400pt"|
 +
[[Image:edge_9010_100_a.png|thumb|400px|max amplitude histo for 55Fe premixed 90/10 at ~100 sccm ]]
 +
|width="400pt"|
 +
[[Image:edge_9010_100_e.png|thumb|400px|energy histo for 55Fe premixed 90/10 at ~100 sccm]]
 +
|}
 +
90/10 premix at 100 sccm<br>
 +
{| border="0" cellpadding="2"
 +
|width="400pt"|
 +
[[Image:source_pos_9010_a.png|thumb|400px|max amplitude histo for 55Fe premixed 90/10 at ~100 sccm ]]
 +
|width="400pt"|
 +
[[Image:source_pos_9010_e.png|thumb|400px|energy histo for 55Fe premixed 90/10 at ~100 sccm ]]
 
|}
 
|}

Latest revision as of 16:05, 12 November 2010

Fe55 with 50/50 Ar/CO2, New preamp and new HVB, ADC half-range

Mixed 50/50 at 40 sccm total, moved the source (collimated as usual) across the top of the straw towards the edge.... With the source over the edge of the straw, the count rate halves and the camel disappears.

max amplitude histo for 55Fe mixed 50/50 at 40 sccm
energy histo for 55Fe mixed 50/50 at 40 sccm



max amplitude histo for 55Fe (side of straw) mixed 50/50 at 40 sccm
energy histo for 55Fe (side of straw) mixed 50/50 at 40 sccm


Overlaying side and edge data, the light coloured plots are with the source above the wire.

max amplitude histo for 55Fe mixed 50/50 at 80 sccm
energy histo for 55Fe mixed 50/50 at 80 sccm


Repeated at 60 sccm

max amplitude histo for 55Fe mixed 50/50 at 60 sccm
energy histo for 55Fe mixed 50/50 at 60 sccm

Events histograms with the source above the wire.

55Fe events, mixed 50/50 at 60 sccm, 1850V
55Fe events, mixed 50/50 at 60 sccm, 1950V
55Fe events, mixed 50/50 at 60 sccm, 2050V

Events histograms with the source off the wire (above the edge of the tube).

55Fe events, mixed 50/50 at 60 sccm, 1850V
55Fe events, mixed 50/50 at 60 sccm, 1950V
55Fe events, mixed 50/50 at 60 sccm, 2050V


90/10 Ar/CO2 (premixed) at approx 80 sccm
The light coloured plots were produced with the 55Fe source centred over the wire; for the darker plots the source was close to the side of the tube. The operating voltage for that mix was previously chosen to be 1450V. Afterpulses are present at 1550V (delayed, so are not included in the integration). The count rate decreased by approx 1/3 when moving the source to the side of the tube - with the 50/50 gas mix the count rate decreased by at least 1/2.

max amplitude histo for 55Fe premixed 90/10 at ~80 sccm
energy histo for 55Fe premixed 90/10 at ~80 sccm

90/10 premix at very approx 100 sccm

max amplitude histo for 55Fe premixed 90/10 at ~100 sccm
energy histo for 55Fe premixed 90/10 at ~100 sccm

90/10 premix at 100 sccm

max amplitude histo for 55Fe premixed 90/10 at ~100 sccm
energy histo for 55Fe premixed 90/10 at ~100 sccm
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