CDC q vs n

Run 11559

cosmics, April 20, 2016

MPV of Landau fitted to DCDCHit->q for each straw, low gain straws (from hvb I22) in red

The above plot is the MPV of a Landau fitted to q for each straw vs straw number; straw numbers start with 1 in the innermost ring, beam left, and increase clockwise around the ring and then out to the next ring, etc. The low gain straws (red) are near the bottom of the CDC.

amplitude, straws in ring 1

amplitude, straws in ring 28

q, straws in ring 1

q, straws in ring 28

The slight upward trend in q vs n (straw number) can also be seen in the plots of amplitude and q for rings 1 and 28.
The oscillations may be an artefact of the fitted Landau MPV moving with the data count in the histogram. ? What would cause this?
The troughs in the hit count correspond to troughs in the fitted MPV for q. ???
The pedestal and amplitude vs n plots do not show huge oscillations, except in number of hits.
There is a clear oscillation in the hit count vs straw number, which peaks at the sides of the CDC. This is because the mostly vertical cosmic ray tracks pass through many straws at the sides, but only a few above and below. The oscillations should not be present with beam data (but the data probably includes some cosmics).

To-do:

Repeat with more data
Use track info - ignore untracked hits
Pick cosmics out of beam data?
Beam data oscillations are more sawtooth than sine, why? Runs 11071-11383(?) have the cdc hole.
Look at drift times

pedestal vs n (straw number)	amplitude vs n	hit count for each straw vs straw number
pedestal vs n, ring 28	amplitude vs n, ring 28	hit count for each straw in ring 28

Run 10496

Run 10496 30nA beam on diamond Feb 24

drift time fit, max drift time 656ns

Run 10777

Run 10777 100nA beam on diamond Mar 6

Run 11667

Run 11667 112nA beam on diamond April 25 after increasing low-gain preamp LV

Hits on tracks only

Zoom on inner rings

Zoom on outer rings

drift time fit, max drift time 672ns

Low gain straws were n=3064 to 3070, 3270 to 3277, 3479 to 3486. Preamp LV was increased on these before run 11577 [ https://logbooks.jlab.org/entry/3401572 ]
Straw n=244 has half gain
Unbowed straws at bottom of ring 24: n=2788, 2789; at bottom of ring 4: n=45; at top of ring 26: n= 2965, 2969

Environment

Run	date	beam (nA)	max drift (ns)	VERY approx q(3522)	pressure (bar)	temp U1	temp U2	temp U3	temp U4	temp D1	temp D2	temp D3	temp D4
10496	Feb 24	41	656	1350	99.71	23.3	23.2	23.6	24.1	25.4	25.5	24.8	25.2
10777	Mar 6	100	665	1000	100.87	22.4	22.3	22.7	23.1	24.9	24.6	24.0	24.4
11559	Apr 20	cosmics	663	1150	101.24	21.9	21.8	22.0	22.4	24.3	23.2	23.0	23.2
11667	Apr 25	120	672	1200	100.47	21.9	21.9	22.0	22.4	24.3	23.2	23.0	23.2


Run 10496

            Name              Min Mean  Max  Sigma 
GAS:i::CDC_Temps-CDC_D1_Temp 25.4 25.5 25.5   0.043
GAS:i::CDC_Temps-CDC_D2_Temp 25.4 25.5 25.5 0.00854
GAS:i::CDC_Temps-CDC_D3_Temp 24.8 24.9 24.9  0.0492
GAS:i::CDC_Temps-CDC_D4_Temp 25.2 25.2 25.2       0

GAS:i::CDC_Temps-CDC_U1_Temp 23.3 23.4 23.4  0.0464
GAS:i::CDC_Temps-CDC_U2_Temp 23.2 23.2 23.3  0.0177
GAS:i::CDC_Temps-CDC_U3_Temp 23.6 23.6 23.6       0
GAS:i::CDC_Temps-CDC_U4_Temp 24.1 24.1 24.1       0

RESET:i:GasPanelBarPress1    99.603 99.662 99.712   0.03003

Run 10777
            Name              Min Mean  Max  Sigma
GAS:i::CDC_Temps-CDC_D1_Temp 24.9 24.9 24.9      0
GAS:i::CDC_Temps-CDC_D2_Temp 24.6 24.7 24.7 0.0497
GAS:i::CDC_Temps-CDC_D3_Temp   24   24 24.1 0.0455
GAS:i::CDC_Temps-CDC_D4_Temp 24.4 24.4 24.4      0
GAS:i::CDC_Temps-CDC_U1_Temp 22.4 22.4 22.4      0
GAS:i::CDC_Temps-CDC_U2_Temp 22.2 22.2 22.3 0.0476
GAS:i::CDC_Temps-CDC_U3_Temp 22.6 22.6 22.7  0.048
GAS:i::CDC_Temps-CDC_U4_Temp 23.1 23.1 23.1      0

RESET:i:GasPanelBarPress1    100.74 100.77 100.87 0.040097


Run 11559
GAS:i::CDC_Temps-CDC_D1_Temp 24.2 24.3 24.4 0.0272
GAS:i::CDC_Temps-CDC_D2_Temp 23.1 23.2 23.3 0.0308
GAS:i::CDC_Temps-CDC_D3_Temp 22.9   23   23 0.0391
GAS:i::CDC_Temps-CDC_D4_Temp 23.2 23.2 23.2      0
GAS:i::CDC_Temps-CDC_U1_Temp 21.8 21.9 21.9 0.0392
GAS:i::CDC_Temps-CDC_U2_Temp 21.8 21.8 21.9 0.0332
GAS:i::CDC_Temps-CDC_U3_Temp   22   22 22.1 0.0257
GAS:i::CDC_Temps-CDC_U4_Temp 22.3 22.4 22.4 0.0305

RESET:i:GasPanelBarPress1    101.02 101.12 101.24  0.07423


Run 11667

HDOPS gluon101:~> myStats -b '2016-04-25 03:37:31' -e '2016-04-25 05:09:25' -l GAS:i::CDC_Temps-CDC_D1_Temp,GAS:i::CDC_Temps-CDC_D2_Temp,GAS:i::CDC_Temps-CDC_D3_Temp,GAS:i::CDC_Temps-CDC_D4_Temp,GAS:i::CDC_Temps-CDC_U1_Temp,GAS:i::CDC_Temps-CDC_U2_Temp,GAS:i::CDC_Temps-CDC_U3_Temp,GAS:i::CDC_Temps-CDC_U4_Temp -p 3

            Name              Min Mean  Max  Sigma
GAS:i::CDC_Temps-CDC_D1_Temp 24.2 24.3 24.4 0.0372
GAS:i::CDC_Temps-CDC_D2_Temp 23.2 23.3 23.4 0.0498
GAS:i::CDC_Temps-CDC_D3_Temp 22.9   23 23.1 0.0266
GAS:i::CDC_Temps-CDC_D4_Temp 23.2 23.3 23.3 0.0499

GAS:i::CDC_Temps-CDC_U1_Temp 21.7 21.9   22  0.102
GAS:i::CDC_Temps-CDC_U2_Temp 21.7 21.8   22 0.0963
GAS:i::CDC_Temps-CDC_U3_Temp 21.9   22 22.1 0.0758
GAS:i::CDC_Temps-CDC_U4_Temp 22.3 22.4 22.5 0.0506

RESET:i:GasPanelBarPress1    100.47 100.48 100.5 0.005884

upstream thermocouples

downstream thermocouples

amplitude MPV (& pressure) vs run number

amplitude MPV vs pressure

Before and after round 1 of gain corrections

Run 11410 charge vs straw

Run 11529 charge vs straw

Runs 11410 and 11529 original

After gain correction

More on sag

amplitude MPV vs max straw sag

amplitude sigma vs max straw sag

amplitude MPV vs max straw sag

expanded for straws 1000-1400

MPV of straws with shorter max drift times (steeper fall-off at long time end of time histogram) are ringed in red. The straw sag plot shows 100 + 100*(max sag in mm)

Gain vs preamp channel (run 11621)

These plots are from run 11621 (with beam), MPV from fit to amplitude of pulses from selected hits on tracks from the target area with theta 85 to 95 degrees.