Questions from civil - and answers

[Elton Smith <elton@jlab.org>]

Hi Rebecca,

Here are the responses to your questions. Let me know if you have any
further questions.

 1. Are the tons in the attached documents (Hall D & Tagger area) metric
or english?
- Hall D: all metric tons
- collimator alcove: weights given in pounds so there is no ambiguity
- Tagger building: all metric tons

 2. Is a 10' high overhead door height at the Tagger area sufficient with
the increased truck ramp slope?  For 35% design, we assume yes.

The 10' is adequate to bring in individual pieces and assemble the
magnet inside the tagger building, which is the current plan.

 3. Where is the quadrupole magnet power supply located?  Please provide
data on this power supply similar to what Chris Cuevas provided on the
other power supplies.

There is only one quadrupole in the tagger building upstream of the tagger
dipoles. There is no quadrupole in Hall D. The quadrupole power supply
will be located in the tagger hall near the quardupole. I have provided
details of the power supply based on a proposal from Danfysik.

 4. What is the stub length and flange type/detail for the photon beam
pipe in the Tagger area and the Collimator Enclosure?  For 35% design, we
assume 1' stubs.

Yes, we agree that 1' stubs should be used.

 5. How tall is the tallest single piece and what is the weight of the
heaviest single piece of equipment to be transported into the Tagger area?
For 35% design, we assume that 10' overhead door at Tagger area and 14'
overhead door at Hall D is sufficient.

The heaviest piece is 13 metric tons (0.48x1.09x3.09 m3) for the tagger
dipole. However, the largest piece is the vacuum chamber which is an
awkard shape (~1.1x1.5x12.5 m3)

 6. Is there adequate room to install equipment into the collimator if the
GlueX equipment (not platform) is in place?  For 35% design, we assume
yes.

At this stage, this assumption is reasonable.

 7. How will the shielding blocks going to be stacked under the concrete
caps at truck ramps?  Who would be responsible for this?  For 35% design,
we assume functional.

This would not be an issue for an enclosed truck ramp.

 8. Are the GlueX equipment rails embedded or mounted on the concrete
floor?  If embedded, we need a length and width to block out to be
installed later.

Drawing A103

We provide guidance as well as sketch. The current drawing A103 does not
show the rails in the correct place. The drawing also shows 9m of rail. We
need 12.25m of rail beginning 14.75 m and ending 2.5 m from the east wall.
The distance between the rails is 5m, correct as drawn and centered on the
beamline.

We also request that instead of rails we include a trench that can later
be used for embedding the rails (6"x6" rails + adequate room for
installation).

It would also be useful to include a box for the solenoid on this plan
view for reference. The solenoid is 5m long and 3.7m (north-south)
centered on the photon beamline. The west edge is 10m from the west wall.

The cryogenic lines should terminate on the photon beamline (7m from the
north wall, 10m from the west wall).

 9. Will the UPS in Counting Room be individual or central?  If central,
does rack count reduce?  How much?

The UPS in the counting room will be central as indicated on the drawings.
After reviewing all the requiremens, we see that there would not be much
reduction in the rack count (at most 1), so we suggest we leave the plans
as drawn.

10. Is there a need for an embedded conudit between collimator enclosure &
Hall D for the collimator magnet power supplies or will conudt be surface
mounted through the labyrinth.

We do not believe this is an issue at this point. Details can be worked
out during future detailing.

--------------------------------------------

Cheers, Elton.


Elton Smith
Jefferson Lab
elton@jlab.org
(757) 269-7625