Antonio Romero (USC)
VERTICAL HODOSCOPES
VH
Carlos MarinasAntonio Romero
University of Santiago de CompostelaNovember ´06
Antonio Romero (USC)
40 Hodoscopes
36 were used on the previous setup These were completely reassembled
and refreshed 4 are new
The technique used is the same as the old ones
They are placed covering the area of higher momentum in left arm (+)
Antonio Romero (USC)
Some photos…
Old hodoscopes refreshed
Detail of the assembling
Antonio Romero (USC)
Tests
All hodoscopes were tested Lightproof Signal shape Signal amplitude with cosmic rays
Magnetic shielding is guaranteed with mumetal (1-17 miliGauss)
They are placed in the frame Gap between slabs in + arm: 0.9 mm Gap between slabs in – arm: 1.2 mm
Antonio Romero (USC)
Some photos…
Experimental setup
Signal shape
Mumetal
Gaps
Antonio Romero (USC)
Cabling
The new hodoscopes have signal and HV cables, coming from old PSh in the previous setup
All the cables were rearranged in the electronics panel and also in the power supply
The cables were tested Impedance Signal transmision Voltage
Antonio Romero (USC)
photos
Don´t touch the ´blue´ cables!!
Antonio Romero (USC)
With beam…
We tested if all the signals exist We made the fine tunning of
voltages in order to have the same amplitudes Primitive Trigger with oscilloscope
using VH and HH We repeated the process one month
after the beginning of the beam
Everything is working!
Antonio Romero (USC)
Conclusions
The system of Vertical Hodoscopes is refreshed
All detectors are working and have the same amplitude
The first tunning is made, but a fine tunning is needed