Report from Visit to PMT facility at Lab 5
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C. Milstene with Peter Shanaan
10/10/02

C. Milstene and P. Karchin 
10/18/02

Apparatus
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The major pieces of apparatus in the lab are:

    1) a commercial (Melles Griot) optical bench holding a nitrogen
    laser and various optical components under an aluminum light tight
    cover

    2) a dark box containing a Hamamatsu M64 pmt (which is missing) on
    a motorized stage and various other optical components

    3) an electronics rack with a HV supply, CAMAC and NIM crates and modules 

    4) a pc running LINUX

Here are some further details.

1) Light from the nitrogen laser goes through a continuously variable
neutral density filter wheel.  The light is then channeled, by a
(primary) quartz fiber and aimed at a cuvet (vial) with a solution of
POPOP fluor toluene and the fluorescent light is observed by two pin
diodes: at 45 and 90 deg with the incoming light The pin diodes are
readout by a 20 bit Burr-Brown ADC.

The laser light is also focused at 90 deg through 2 neutral density
filter wheels and to a secondary quartz fiber which transmits the
light to a dark box on another table (1.5 m away) Both fibers are
clear fibers.

2) The end of the secondary fiber is at 90 deg with a wave length
shifting fiber located in the black box. Its end is connected to the
M64 PMT which is normally located in the black box. There is no M64
available at lab 5 right now.

A special connector picks up the signal from the anode of the M64 and
an 8 ns cable is used to transmit the signal to the QIE test board:
"Menu Testboard" (FNAL PPD 15 May 2001).  The DC power supplies to
operate the Testboard are missing.  It appears that there is only one
analog input channel to the testboard - so apparently only one pmt
channel can be read out - but we are not sure about this.

The Testboard communicates with a CAMAC module ("pigtail CAMAC Interface") 
with a 1000 word FIFO buffer.
    
Operation of the Apparatus
--------------------------

Using instructions from Peter, we we able to log onto the pc and access the
directories with the test programs.

We could run the CAMAC programs but since the Testboard had no power,
we could not acquire QIE data.

We were able to operate the stepping motors on the optical bench.

References.
----------

P. Shanaan and N. Tobien, "Studies of QIE Performance with Realistic
Pulse Shapes" - explains everything in detail.  NUMI-Note-Elec-838.
(This is not a public note.)

T. Zimmerman and M Sarraj, "A second Generation Charge Integrator and
Encoder ASIC", IEEE transactions on Nuclear Physics Vol43, n03, June
96.

Peter Shanaan, older note about QIE's (more KTeV related)

Hamamatsu Characteristics form on the M64, which shows a cross-talk of
2%, a 30% gain variation and much much more.

Search page for NuMi notes, http://www-numi.fnal.gov/noteSelPublic.html