**[FPD Detector Schedule]{.underline}**

Gilvan A. Alves

Lafex/CBPF

The FPD detector prototype construction has been completed and tests are
underway. The experience gained in the prototype construction allows us
to make a more realistic estimate of the production schedule and where
are the critical elements:

1.  The total time for the production of 18 detectors is estimated at 8
    months. With that in mind, and the present accelerator schedule,
    construction has to start no latter than October 1999.

2.  The critical elements for the detector construction, which can cause
    delays on the schedule are: Material purchase, which depend on
    vendor schedule, like MAPMTs and Fibers; Labor intensive tasks, like
    fiber polishing, splicing, detector assembly and new frame building.

3.  MAPMT purchase have an estimated delivery time of 6 months for 100
    units plus 1 to 2 months for testing, so purchase have to be placed
    no latter than October 1999.

4.  Fiber purchase has to be placed with 2 months in advance of the
    construction phase, which implies August 1999 for this order.

5.  Polishing square fibers is only possible using the ice-polishing
    method (Fermilab lab 7 has this capability). Availability of the lab
    7 facility may change due to work load so we estimate 2 months for
    this task, which have to precede the fiber splicing.

6.  Splicing of the scintillating to clear fibers using the MSU splicing
    machine, could be done outside of Fermilab, which currently has only
    one machine available at lab 5. However transportation of the fiber
    before and after the splicing needs a special procedure due to the
    delicate nature of the fibers specially after splicing. We estimate
    3 months for this task using a single machine and one technician.

7.  Assembling and fixing the spliced fibers in the frames and MAPMT
    masks can be done in parallel while the splicing is taking place. We
    estimate 3 to 4 months for this task with one full time technician.

8.  A new frame design to hold the fibers has been made as a result of
    the prototype experience. This frame has to be built before the
    assembly phase, which is about December 1999, and the estimated time
    for this task is 1 month.

In the following tables we present a list of items involved in the
prototype and production phases of the FPD detector construction.
Table-I lists the items needed for the prototype and Table-II gives an
estimate of the needs for the production of the 18 detectors plus 5
spare. As can be seen from Table-I the critical components for the
prototype completion are the MAPMTs, signal amplifiers and LED pulser
driver for the monitoring system. In the assembly part, technician help,
which could come from outside of Fermilab, would be of great help in
order finalize the prototype.

Item Cost (\$) Delivery Time

  ----------------------- ----------------------- -----------------------
  Scintillating Fibers    150.00 \*               4 weeks \*
  (50m)                                           

  Clear Fibers (150m)     450.00 \*               4 weeks \*

  Al Frame mold (2)       940.00 \*               3 weeks \*

  PMT mask mold (3)       1,000.00 \*             3 weeks \*

  Plastic Frames (3)      2.00 \*                 2 weeks \*

  PMT mask (7)            4.00                    2 weeks

  Trigger Scintillator    100.00 \*               1 week \*
  (1)                                             

  Cables (HV+signal)      No cost §               

  Frame support (1)       200.00 \*\*             2 weeks \*\*

  Light tight box (1)     200.00 \*\*             2 weeks \*\*

  MAPMT (7)               9,973.18                4 weeks

  Amplifier (7x16ch.)     600.00                  4 weeks

  LED pulser              100.00                  4 weeks

  Trigger PMT             No cost §               

  Labor Item              Cost (\$)               Time for the task

  Fiber ice polishing     100.00 \*               1 week \*

  Fiber splicing          360.00 †                3 days

  Detector assembly       480.00 †                4 days

  Frame polishing +       100.00                  3 days
  sputter                                         

  Final assembly          120.00 †                1 day
  ----------------------- ----------------------- -----------------------

-   \* Item already at hand § Cables and PMT from Run I detector

-   \*\* Not crucial for testing † Labor cost

Table I -- Cost and time estimate for the construction of one detector
prototype.

Item Cost (\$) Delivery Time

  ----------------------- ----------------------- -----------------------
  Scintillating Fibers    2,572.50                6 weeks
  (1050m)                                         

  Clear Fibers (3950m)    6,004.00                8 weeks

  Al Frame mold (2)       940.00                  3 weeks

  Plastic Frames (69)     35.00                   4 weeks

  PMT mask (161)          85.00                   4 weeks

  Trigger Scintillator    2,300.00 †              2 weeks
  (23)                                            

  Cables (HV+signal)      No cost §               

  Frame support (23)      4,600.00                3 weeks

  Light tight box (23)    4,600.00                3 weeks

  MAPMT (136)             170,000.00              4 months

  Amplifier (7x16ch.)     11,080.00               4 weeks

  LED pulser              2,300.00                4 weeks

  Labor Item              Cost (\$)               Time for the task

  Trigger PMT             No cost §               

  Fiber ice polishing     1000.00                 2 weeks

  Fiber splicing          7,200.00 †              2 months

  Detector assembly       10,000.00 †             3 months

  Frame polishing +       2,300.00                3 weeks
  sputter                                         

  Final assembly          2,400.00 †              20 days
  ----------------------- ----------------------- -----------------------

-   § Cables and PMT from Run I detector † Labor cost

Table II -- Cost and time estimate for the FPD detector production.

**References:**

\[1\] -- *The Forward Proton Detector at D0*, G. A. Alves (for the D0
collaboration), Lishep98 -- Workshop on Diffractive Physics, Rio de
Janeiro, RJ, FERMILAB-CONF-98-107-E.

\[2\] -- Coordinate System and Naming Convention for the FPD Roman Pots,
Mike Martens, Internal Note.

<http://www-ap.fnal.gov/~martens/fpd_acc/fpd_coord/fpd_coord.html>