HPGe

General Overview
This pages is intended as a guide to help NPTool users to analyse data from the HPGe array at TAMU. The structure of the data branch and the convention used for the different segments will be presented.

GeTAMU Detector
The Germanium detector array is made of 4 clovers mounted in a "fan"-like set-up around the target. Each clover is composed of 4 identical crystals enumerated clockwise. Looking downstream, the crystals (1,4) will face the experimenter. Every Clover is globally segmented into 3 different regions (segments) along the beam axis. This segmentation is NOT within a crystal but within a clover. The three segments are denoted Left, Middle and Right. When looking downstream the experimenter will face the "left" segment. In other words the beam goes from Left -> Middle -> Right. Any energy deposited in the detector is read twice in two different compositions, one with 4 cores, the other with 3 segments. Giving a total of 8 detection zones (see table below) that can be used for Doppler Correction. For a single event some combination of core/segment are physically impossible. The "Middle" segment covers a part of all the crystals, the "Left" segment covers only crystals 1 and 4, and the "Right" segment covers the crystals 2 and 3.

Convention in NPTool:
 * The segments are represented by numbers, for {Left, Middle, Right}={1,2,3}
 * Same for the crystals = {1,2,3,4}
 * The table below shows the decomposition using the crystals[#] and segments(#) into 8 detection zones

General Detector Configuration
Here's a format of the configuration file to include 2 GeTAMU clovers in nptool IMPORTANT: this is only to explain the format, not to copy it and use it. The indentation (used by nptool to parse the file) might not be proper in the following.

GeTAMU GeTAMUClover CloverID= 1           (ID of the clover) R=     60 mm          (distance from the hypothetical center of the beam spot) Theta= 90 deg         (Polar angle of the detector central axis with respect to beam axis) Phi=   45 deg         (Azimutal angle, rotation around beam axis) Beta=   0 0 0  deg    (Euler angles to control to tilt the detector around it's own axis) GeTAMU GeTAMUClover CloverID= 2 R=     60 mm    Theta=  90 deg Phi=  135 deg Beta=   0 0 0  deg

GeTamu Detector Configuration
ConfigGeTamu %%%%%%%% Default is high energy %LOW_GAIN_ENERGY_CRY %LOW_GAIN_ENERGY_SEG %%%%%%%% Defective channels %DISABLE_ALL    CLOVER04 %DISABLE_CHANNEL CLOVER01_SEG01 %%%%%%%% Thresh. in "channels" for Raw, in keV for Calibrated CRY_E_RAW_THRESHOLD 300 SEG_E_RAW_THRESHOLD 300 CRY_E_THRESHOLD 100 SEG_E_THRESHOLD 100 %%%%%%%% ADD Back scheme for the analysis ADD_BACK_CLOVER %ADD_BACK_ARRAY %ADD_BACK_FACING %%%%%%%% Randomise raw energy within ADC bin %ADC_RANDOM_BIN

Analysis in the NPTool framework (in progress)

 * Analysis convention/philosophy
 * What is stored in the tree and what is not
 * What is done in the Analysed data (Physics class) and what is done in the outside program

Raw Data (in progress)
Brief description of the structure of data

Analysed Data (in progress)
List of the main functions used to get and set information (in progress)

Analysis functions (Add what you want!)
How Doppler correction is done.. etc...