Difference between revisions of "CDC tracked cosmics"
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Look at a higher voltage for the old preamp to separate peak from noise (n=8)<br> | Look at a higher voltage for the old preamp to separate peak from noise (n=8)<br> | ||
− | Old preamp (flat) | + | Old preamp (flat), 2050V |
{| border="1" cellpadding="2" | {| 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_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]] | |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) TBA | + | Old preamp (tilted), 2050V... TBA |
Revision as of 17:30, 18 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... TBA