Difference between revisions of "CDC tracked cosmics"
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At 1950V, 50/50 gas: | At 1950V, 50/50 gas: | ||
− | + | Tracked cosmics - amplitude spectra for channel 7. In software, threshold = pedestal-mean + n * pedestal-width. n=10. | |
+ | Chamber is horizontal (left) and then tilted at 45 degrees (right). | ||
<br> | <br> | ||
− | Old preamp | + | Old preamp, n=10 |
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
|width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V]] | |width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V]] | ||
|width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp_45deg.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees]] | |width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp_45deg.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees]] | ||
|} | |} | ||
− | New preamp, ADC range halved (scale doubled) | + | New preamp, n=10, ADC range halved (scale doubled) |
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
|width="415pt"|[[Image:cosmic_amplitude_1950V_new_preamp.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V]] | |width="415pt"|[[Image:cosmic_amplitude_1950V_new_preamp.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V]] | ||
|width="415pt"|[[Image:cosmic_amplitude_1950V_new_preamp_45deg.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees]] | |width="415pt"|[[Image:cosmic_amplitude_1950V_new_preamp_45deg.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees]] | ||
+ | |} | ||
+ | |||
+ | |||
+ | Zoom in on first pic (old preamp, n=10) | ||
+ | |||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp_expanded.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, scale expanded]] | ||
+ | |} | ||
+ | <br> | ||
+ | |||
+ | Repeat with n=8<br> | ||
+ | Old preamp, n=8 | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp_thr8.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, n=8]] | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp_45deg_thr8.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=8]] | ||
+ | |} | ||
+ | New preamp, n=8, ADC range halved (scale doubled) | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_new_preamp_thr8.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V, n=8]] | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_new_preamp_45deg_thr8.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=8]] | ||
+ | |} | ||
+ | |||
+ | |||
+ | Repeat with n=6<br> | ||
+ | Old preamp, n=6 | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp_thr6.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, n=6]] | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_old_preamp_45deg_thr6.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=6]] | ||
+ | |} | ||
+ | New preamp, n=6, ADC range halved (scale doubled) | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_new_preamp_thr6.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V, n=6]] | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_1950V_new_preamp_45deg_thr6.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=6]] | ||
+ | |} | ||
+ | |||
+ | Conclude that n=8 works best for the old preamp (tilted)<br><br> | ||
+ | <hr> | ||
+ | <br> | ||
+ | Energy spectra for n=8<br> | ||
+ | Old preamp | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_energy_1950V_old_preamp_thr8.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, n=8]] | ||
+ | |width="415pt"|[[Image:cosmic_energy_1950V_old_preamp_45deg_thr8.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=8]] | ||
+ | |} | ||
+ | New preamp, ADC range halved | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_energy_1950V_new_preamp_thr8.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V, n=8]] | ||
+ | |width="415pt"|[[Image:cosmic_energy_1950V_new_preamp_45deg_thr8.jpg|thumb|none|400px|new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=8]] | ||
+ | |} | ||
+ | |||
+ | <hr> | ||
+ | <br> | ||
+ | Look at a higher voltage for the old preamp to separate peak from noise (n=8)<br> | ||
+ | Old preamp (flat), 2050V | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_2050V_old_preamp_thr8.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=8]] | ||
+ | |width="415pt"|[[Image:cosmic_energy_2050V_old_preamp_thr8.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=8]] | ||
+ | |} | ||
+ | |||
+ | Old preamp (tilted), 2050V | ||
+ | |||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_2050V_old_preamp_45deg_thr8.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=8]] | ||
+ | |width="415pt"|[[Image:cosmic_energy_2050V_old_preamp_45deg_thr8.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=8]] | ||
+ | |} | ||
+ | |||
+ | Help. | ||
+ | <br> | ||
+ | Old preamp (tilted), 2050V, software threshold n=10 | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_2050V_old_preamp_45deg_thr10.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10]] | ||
+ | |width="415pt"|[[Image:cosmic_energy_2050V_old_preamp_45deg_thr10.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10]] | ||
+ | |} | ||
+ | |||
+ | <br> | ||
+ | Old preamp (flat), 2050V, software threshold n=10, newer data | ||
+ | {| border="1" cellpadding="2" | ||
+ | |width="415pt"|[[Image:cosmic_amplitude_2050V_old_preamp_thr10_30726.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10, 30726]] | ||
+ | |width="415pt"|[[Image:cosmic_energy_2050V_old_preamp_thr10_30726.jpg|thumb|none|400px|old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10, 30726]] | ||
|} | |} |
Latest revision as of 13:18, 21 June 2010
At 1950V, 50/50 gas:
Tracked cosmics - amplitude spectra for channel 7. In software, threshold = pedestal-mean + n * pedestal-width. n=10. Chamber is horizontal (left) and then tilted at 45 degrees (right).
Old preamp, n=10
New preamp, n=10, ADC range halved (scale doubled)
Zoom in on first pic (old preamp, n=10)
Repeat with n=8
Old preamp, n=8
New preamp, n=8, ADC range halved (scale doubled)
Repeat with n=6
Old preamp, n=6
New preamp, n=6, ADC range halved (scale doubled)
Conclude that n=8 works best for the old preamp (tilted)
Energy spectra for n=8
Old preamp
New preamp, ADC range halved
Look at a higher voltage for the old preamp to separate peak from noise (n=8)
Old preamp (flat), 2050V
Old preamp (tilted), 2050V
Help.
Old preamp (tilted), 2050V, software threshold n=10
Old preamp (flat), 2050V, software threshold n=10, newer data