DeltaDoverD Progress

9/5/08

1.) SIDIS Analysis

a.) Cross-Section comparison

 Figure out the definition of cross-section being used in the data

 i.) Calculate absolute cross section for Cos Thet_pi = 0.5,  1 < Q^2 < 4 GeV^2  , W = 1.45 +/- 0.2 GeV

 ii.) Plot Phi CM -vs- Theta Lab pion when Theta_CM Pion = -0.3  also plot Phi CM Pion -vs- Theta Lab Electron

2.) Detector Construction

   4 chambers are built.   

TGEM:

Foils have been mounted on the TGEM comparison chamber.  Both charge collectors are mounted on the TGEM test detectors.  One TGEM test detector has the Thick PC board GEM foils which need much higher HV than the regular GEM foils.  The second TGEM test chamber has 3 GEM foils from CERN.

Need a min of 32 1 Meg Ohm resistors to complete the output termination connenctors. Need 32 more termination connectors made from 16 wires.

Need to grind down 16, M3 bolts for mounting the GEM foils and TGEM PCboards.

Need 24 washers for GEM foils. Check mounting of the TGEM boards. Look up spacing and HV for the TGEM boards.

Need to etch 2 cathods for the TGEm boards.

Qweak:

  a.) Need to do final outer footprint machinging so there is no interference with the Electron profile of the other octant.

  b.)  Need to maching back of the chamber for the Charge collector

 c.) Need to machine thick frames for the cathode and maybe GEM foils.

 d.) Apply electrical insulation to HV distribution boards

 e.) Need to mount GEM foils on the Qweak chambers.

3.) SIS3610 I/O software

Objectives: a.) The first step will be to read 16 of the I/O input channel into a CODA data file.

b.) Display the 16 input channels on a GUI. Unfortunately, only 2 of the 16 will be used to read in the GEM output. The GEM output will tranfer 128 hit/no hit signals to a single I/O channel in a serial fashion. The data from one I/O channel needs to be decoded according to the data structure described in Figure 8 and 9 of the VFAT manual.

c.) The final task will be to write a multiple trigger function so the I/O can be triggered by several different interupt trigger signals and label those trigger signals.

Tasks:

Inject a signal into the I/O board input connector and use a Read function from the ROC to determine if the signal is high or low.