MOLINA
Tue, 10 Apr 2001 

I finished already the equations for the Up spectrometers.

The way that we did was using the combination of the pixels in the first
detector (confirmed by the x fibers) with the sum of all the pixels in the
second detector (not confirmed by the x fibers).

In other words, the equations are written as: 

pixel1 (u,x,v) x SUM(all pixels in detector 2 (u,v))    

The equations are in 

/prj_root/810/fp_1/molina/trigger/P_UP

The good news is that we need to write only 4131 equations for the 4
triggers! 

DAQ STATUS
Fri, 13 Apr 2001

In this week we transfer all the equipment that we won't use from the
Small Control Room to lab 6 and put new modules (taken from lab 6)
in order to perform the tests of the amplifiers boards.
Rick Hans enabled a new power distribution box for the second rack so now
everything is connected and ready to work. The draws of the connections
will be writen in the log book.
Next week we'll begin testing and connecting the modules for the data
aquisition system in order to prepared them to take data as soon as the
pots were ready. Also next week we expect to begin the tests of the
amplifier boards.

MIKE STRANG
Wed, 11 Apr 2001 

The splicing machine appears to be working smoothly. We are producing
0.76, 0.77 spliced fibers with ~20% rejection (down from previous glass
pieces) with a swell at the splice point to ~0.80, 0.81.  (Frames can
accomodate up to 0.82) We have noticed an increased rejection in attempts
to splice 0.78 fibers so are restricting ourselves to the smaller fibers
for the time being. This increase can be due to buildup in the glass
pieces or insufficiently sized glass pieces.

Detectors 1 and 2 are completed and ready for insertion into cartridges as
per communication from Eileen Hahn yesterday. Detector 3 is completed here
at UTA and detector 4 is having the cookies glued today. I will transport
these detectors to FNAL next week. Detector 5 is 1/2 filled and is
continuing to be filled as fibers are spliced.

JORGE BARRETO
Wed, 11 Apr 2001

1) Tracking Reconstruction Status:

    C++ Algorithm was created and preliminaries results were compared to
previous Fortan's, with good agreement between them. Resolutions in xi and
t were then obtained for each spectrometer (p1_up, p2_in, p3_down, p4_out)
for the proton side, and (pb1_up, pb2_in, pb3_down, pb4_out, pb5_in) for
the pbar side. These plots can be found in the two .tar.gz files in
attachment.

    Comments about the track method:

    --> Fibers were generated with the Fortran Code, by sending particles
with values of xi_in[0.0,0.1,0.005], t_in[0.,5.,0.01] and
phi[0,2pi,2pi/360] from the IP region (Z=0) up to the pot locations,
checking at each step if it was inside the beam pipe. A valid track is
only considered if fibers are on in both pots of a given spectrometer.

   ---> The C++ algorithm reads this input, transforms fibers to segments,
and starts reconstruction using the method given in D0Note #3788 and
#3789. After having found xi_out and t_out, the code performs a final
reconstruction to check if the track is always inside the beam pipe.

    ---> With this check, we found that our efficiency reconstruction is
pretty good for the quadrupole pots in both arms (~92%), but is rather
small for the dipoles pots (~60%). We found that this low value was
related to the small steps we took above, since by reducing
t_in[0.,3.,0.01], we got an efficiency of near 94% for all spectrometers,
meaning that the tracks that were rejected in the first reconstruction at
the dipole stations were those that had a initial (fortran) path very near
the beam pipe, and the resolution on xi_out (see below) made them to be
off the beam pipe. Although we think this is the correct explanation, we
are performing some extra checks to be sure of it.

    ---> The resolutions Del_xi = xi_out - xi_in and Del_t = t_out - t_in
are obtained (those shown in the plots).

    Comments about the Results:

    ---> We think we have a good xi-resolution at every FPD station.
Vertical stations have better xi-resolution than horizontal ones, at the
proton arm. The opposite is true for the pbar arm, as should be, due to
the Tevatron lattice. However, although vertical stations at the pbar arm
have similar resolutions as the horizontal ones at the proton arm, as
expected, horizontal stations at the pbar arm have much worse resolutions
than the vertical ones at the proton level, which seems unexpected. This
apparently contradictory results have to be rechecked.

    ---> t-resolutions seem to be bad at all pot stations, specially at
the pbar arm, including the dipoles station. It seems to us that the
reconstruction method is not able to give good t-resolutions. Yet, we
don't know why the pbar arm has worse t-resolutions than the proton arm,
and why there is an off-set on them.

 Any comments, or suggestions, about the above statements (or results)
will be appreciate.

2) Multhits:

    ---> We have just started including multhits in the track code this
week. We expect to have preliminary results by the next weekly report. We
would appreciate any comments or suggestion on how should we deal with it
in the code.

    Jorge (for the Rio's tracking group: Vitor Oguri + Carley Martins +
Gilvan ).

NB: The files  p1.ps, p2.ps, p3.ps, p4.ps, pb1.ps, pb2.ps, pb3.ps, pb4.ps,
pb_dip.ps are available at:

<a href="http://www-d0.fnal.gov/fpd/FPD_News/">
http://www-d0.fnal.gov/fpd/FPD_News/</a>.


WAGNER CARVALHO
Thu, 12 Apr 2001

	The project is in an early stage but I'm speeding up after
"finishing" getting educated on C++.
	Hope it doesn't last too long.

	Project: Unpacking Tool

	- Studying existing related codes, mainly from CFT;
	- Begining to sketch the code for FPD.


HANS WILLUTZKI
Thu, 12 Apr 2001

I have started with the assembly work in LAB3. We have 12 Cartridge Bottom
cases (part 6). 11 of these have the holes through which you screw into
part 7 (Cartridge Case Lock) off by 1/10 th of an inch. This misplaces the
ring with the missing piece that has to be inserted, causing alignment
problems with Cartridge Plate 1 ( part 9).

Possible solution: shorten part 7 by 1/10 th of an inch. This is too much
to file off by hand.

The 12 th piece is machined exactly to specs but is mis- sing the hole
through which it is fastened to part 12. This is obviously no big deal.

Tomorrow we will examine all the other parts to look for potential
problems (hopefully none),so, if needed they can be fixed.

Two more things:
                Does anyone on site have keys for Lab 3
                and Lab 6 that I could borrow for the
                weekend?

                We used to have a digital caliper in Lab 6
                that has "migrated". Does anyone know about
                its whereabouts?