Goofie Data - Final Plots - from 25.10.06 to 01.11.06

Click on the link at the bottom of the page to see the plots in high resolution-full screen mode

NOTE: more detailed explanations about plots and methods used for obtaining them will be added soon. Each point corresponds to one integrated signal (2500 events) in all the plots, and sometimes it is labelled "pack".

-- JuanCastillo - Generation date: in blue

Brief description of the GOOFIE monitor.

A detailed documentation you will find here

08 Jun 2007 Goofie (Gas prOportional cOunter For drIting Electrons) monitor layout: Goofie monitor layout

  • Elements:
    1. Alpha sources. Am241 sources emit alpha particles with E = 5.486 MeV perpendiculary to the drift channel. The alpha particles ionize the gas, creating a electron cloud that drift through the drift channel.
    2. Trigger counters. One-wire tube counters that give us the signal to start the data acquisition.
    3. Pickup detector. Once a signal is triggered, it records a pulse height spectrum as a function of time.
    4. T probes. Two temperature probes are placed inside the fiel cage, one close to each trigger counter.
    5. Field Cage. Isolation of the whole system.
    6. Drift Channel. 32 field plates (ring electrodes) with a hole in the middle are defining a "channel" that an electron cloud created by ionization drifts through.
    7. Resistor Chain. (In black, parallel to the drift channel). Like in the TPC it is necessary to degrade the applied high voltage using a resistor chain to obtain a uniform working field of E = 400 V/cm.

  • Working principle: The alpha particles emmited by our sources ionize the gas mixture, creating an electron cloud that drifts through the drift channel. Depending on where the cloud is created, we name the recorded signal 'far event' (if triggered by the far trigger counter) or 'near event' (if triggered by the near trigger counter). The drift time Td is defined by the difference between peak positions of different ionization events (near/far). The distance between alpha-sources (the drift length) has been fixed to Ld = 20.4 cm. 2500 events are accumulated in an integrated signal giving us thus an accurate average value for the (near/far) event peak position, which difference will give us the drift time Td. Drift velocity is therefore calculated as Vd = Ld/Td. The gain is also calculated from the area of the peaks of the integrated signal.

Drift Velocity and Composition plots.

Drift Velocity Vd (fitting peaks with gamma-4 functions, dinamic peak windows) and Drift Velocity corrected for Temperature and Pressure (T/P). As correction parameters we use the output of the fitting of a T/P versus Vd plot for the first 50 points. See slow control dependences for more details. The raw values (in black) are the ones shifted in the composition plot, in order to use the old velocity and gain planes : Generation date: 07 Dec 2006
Drift Velocity (fitting peaks with gamma-4 functions) and Drift Velocity corrected with T/P, new peak windows

Composition calculated using corrected shifted values (of drift velocity Vd, pressure P and gain G) and a normalization. First Vd, G and P are shifted, then corrected for T/P using a linear fit of the first 50 points (like above) and after that normalized. The drift velocity Vd is normalized with the central point of the drift velocity plane (corresponding to CO2 = 10%,N2 =5%). G is normalized with the norm of the range used for obtaining the correction parameters. Generation date: 13 Dec 2006:
Composition

Drift Velocity dependences. Values obtained using GARFIELD. Here we see that for our average range of pressures (see pressure dependences in the next section) having a constant temperature T = 293.15 K , the corresponding drift velocity is 2.66 cm/micros. However,a pressure of 980 mbar and a drift velocity of 2.71 give us a percentage of CO2 equal to 9.75%. Further refinement could help us to tune the method. Generation date: 13 Dec 2006
Drift Velocity dependences. Values obtained using GARFIELD

Drift Velocity (gamma-4 fit) and Drift Velocity corrected resolution (per unit), dinamic peak windows: Generation date: 07 Dec 2006
Vd (gamma-4 fit) and Vd corr

Integrated signal, fitting function (gamma 4) and fitted peaks, dinamic windows: Generation date: 12 Dec 2006
pack, gamma 4 and fitted peaks, dinamic windows

Slow Control dependences

Fits of clouds [(T/P) vs values of drift velocity and areas] projections for raw value corrections.First a plot of T/P vs value for the fitting range is filled, then it is projected, and then fitted with a first degree polinomy. Generation date: 16 Dec 2006 : Fits of point clouds [(T/P) vs value] projections for value correction.

Pressure (P) evolution in time Generation date: 12 Dec 2006 :
P evolution

Temperature over Pressure (T/P) evolution in time Generation date: 07 Dec 2006 :
T over P (T/P) evolution in time

Goofie Data from 25.10.06 to 01.11.06

-- JuanCastillo - 09 Nov 2006

Test plots. The final ones will be uploaded as soon as possible wink in a "visible" format.

Events -Samples of A B C channels- from 25.10.06 to 01.11.06

Topic attachments
I Attachment Action Size Date Who Comment
AF_AFcorr_vs_time.psps AF_AFcorr_vs_time.ps manage 15.2 K 2006-11-09 - 17:46 JuanCastillo Far Area and Far Area corrected from 25.10.06 to 01.11.06
AF_and_TfP_vs_time_4files.psps AF_and_TfP_vs_time_4files.ps manage 15.1 K 2006-11-09 - 16:32 JuanCastillo Far Area correlation with Tf/P (normalized) from 25.10.06 to 01.11.06
AN_ANcorr_vs_time.psps AN_ANcorr_vs_time.ps manage 15.6 K 2006-11-09 - 17:45 JuanCastillo Near Area And Near Area corrected from 25.10.06 to 01.11.06
AN_and_TnP_vs_time_4files.psps AN_and_TnP_vs_time_4files.ps manage 15.1 K 2006-11-09 - 16:39 JuanCastillo Near Area correlation with Tn/P (normalized) from 25.10.06 to 01.11.06
Comp_refGSI_Gnorm_PVshift.pngpng Comp_refGSI_Gnorm_PVshift.png manage 10.8 K 2006-12-13 - 15:46 JuanCastillo Composition
Garfield_Vd_dep.pngpng Garfield_Vd_dep.png manage 6.7 K 2006-12-13 - 17:31 JuanCastillo Drift Velocity dependences. Values obtained using GARFIELD
Goofie-only-2.pngpng Goofie-only-2.png manage 6.8 K 2007-06-08 - 14:29 JuanCastillo Goofie monitor layout
Pevol_0_204.pngpng Pevol_0_204.png manage 4.8 K 2006-12-12 - 13:13 JuanCastillo P evolution
TsPevol_0_204_modified.pngpng TsPevol_0_204_modified.png manage 15.1 K 2006-12-06 - 16:55 JuanCastillo T over P (T/P) evolution in time
Vg4_Vg4corr_50_100_0_200_new_win.pngpng Vg4_Vg4corr_50_100_0_200_new_win.png manage 10.9 K 2006-12-07 - 19:29 JuanCastillo Drift Velocity (fitting peaks with gamma-4 functions) and Drift Velocity corrected with T/P, new peak windows
Vg4_Vg4resol_50_100_0_204_new_win.gifgif Vg4_Vg4resol_50_100_0_204_new_win.gif manage 7.0 K 2006-12-07 - 19:31 JuanCastillo Drift Velocity (gamma-4 fit) and Drift Velocity corrected resolution
Vg4_and_TP_vs_time_4files.psps Vg4_and_TP_vs_time_4files.ps manage 18.6 K 2006-11-09 - 16:25 JuanCastillo Drift Velocity correlation with T/P (normalized values) from 25.10.06 to 01.11.06
Vg4_and_Vg4corr_vs_time_4files.psps Vg4_and_Vg4corr_vs_time_4files.ps manage 15.5 K 2006-11-09 - 16:28 JuanCastillo Drift Velocity and Drift Velocity Corrected evolution from 25.10.06 to 01.11.06
cern_comp_4files_until_01_11.psps cern_comp_4files_until_01_11.ps manage 26.1 K 2006-11-09 - 16:21 JuanCastillo Composition Curve from 25.10.06 to 01.11.06
comp_plot_25_10_01_11.pngpng comp_plot_25_10_01_11.png manage 22.6 K 2006-12-06 - 14:18 JuanCastillo Composition
fits_50_100_non_shifted.pngpng fits_50_100_non_shifted.png manage 12.0 K 2006-12-18 - 18:59 JuanCastillo Fits of point clouds [(T/P) vs value] projections for value correction.
fitted-pack-g4-dinwin-12-12-06.pngpng fitted-pack-g4-dinwin-12-12-06.png manage 14.3 K 2006-12-13 - 09:06 JuanCastillo Integrated signal, fitting function (gamma 4) and fitted peaks, dinamic windows
one_event_01_11_06.psps one_event_01_11_06.ps manage 32.8 K 2006-11-10 - 16:25 JuanCastillo event 40 data acquisition 01.10.06 (Near)
one_event_02_11_06.psps one_event_02_11_06.ps manage 32.0 K 2006-11-10 - 16:26 JuanCastillo event 5 data acquisition 02.11.06 (Far)
one_event_09_11_06.psps one_event_09_11_06.ps manage 29.3 K 2006-11-10 - 16:27 JuanCastillo event 5 data acquisition 09.11.06 (Blind Channel B)
one_event_25_10_06.psps one_event_25_10_06.ps manage 32.8 K 2006-11-10 - 16:23 JuanCastillo event 5 data acquisition 25.10.06 (Far)
one_event_28_10_06.psps one_event_28_10_06.ps manage 32.8 K 2006-11-10 - 16:19 JuanCastillo event 5 data acquisition 28.10.06 (Far)
one_event_29_10_06.psps one_event_29_10_06.ps manage 32.7 K 2006-11-10 - 16:25 JuanCastillo event 5 data acquisition 29.10.06 (Far)
pulser-peaks_11_12_06.pngpng pulser-peaks_11_12_06.png manage 29.7 K 2006-12-11 - 09:25 JuanCastillo Pulser peaks. 11.12.2006
pulser-peaks_detail-1_11_12_06.pngpng pulser-peaks_detail-1_11_12_06.png manage 29.3 K 2006-12-11 - 09:26 JuanCastillo Pulser peak-detail-1. 11.12.2006
Topic revision: r23 - 2008-04-08, JuanCastillo
 
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