CDC tracked cosmics

From GlueXWiki
Revision as of 13:18, 21 June 2010 by Nsjarvis (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

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

old preamp, cosmics, 50/50 Ar/CO2, 1950V
old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees

New preamp, n=10, ADC range halved (scale doubled)

new preamp, cosmics, 50/50 Ar/CO2, 1950V
new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees


Zoom in on first pic (old preamp, n=10)

old preamp, cosmics, 50/50 Ar/CO2, 1950V, scale expanded


Repeat with n=8
Old preamp, n=8

old preamp, cosmics, 50/50 Ar/CO2, 1950V, n=8
old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=8

New preamp, n=8, ADC range halved (scale doubled)

new preamp, cosmics, 50/50 Ar/CO2, 1950V, n=8
new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=8


Repeat with n=6
Old preamp, n=6

old preamp, cosmics, 50/50 Ar/CO2, 1950V, n=6
old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=6

New preamp, n=6, ADC range halved (scale doubled)

new preamp, cosmics, 50/50 Ar/CO2, 1950V, n=6
new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=6

Conclude that n=8 works best for the old preamp (tilted)



Energy spectra for n=8
Old preamp

old preamp, cosmics, 50/50 Ar/CO2, 1950V, n=8
old preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=8

New preamp, ADC range halved

new preamp, cosmics, 50/50 Ar/CO2, 1950V, n=8
new preamp, cosmics, 50/50 Ar/CO2, 1950V, 45 degrees, n=8


Look at a higher voltage for the old preamp to separate peak from noise (n=8)
Old preamp (flat), 2050V

old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=8
old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=8

Old preamp (tilted), 2050V

old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=8
old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=8

Help.
Old preamp (tilted), 2050V, software threshold n=10

old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10
old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10


Old preamp (flat), 2050V, software threshold n=10, newer data

old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10, 30726
old preamp, cosmics, 50/50 Ar/CO2, 2050V, n=10, 30726