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FW: Distances





-----Original Message-----
From: Peter Winter [mailto:peter.winter@psi.ch] 
Sent: Thursday, April 27, 2006 4:24 AM
To: John Blackburn
Cc: David Hertzog; Eric Thorsland; Ron McNabb
Subject: Distances

Dear all,

yesterday Sara and I completed to measure some remaining distances in 
the area which are still needed for the determination of the length of 
the vacuum pipe. Let's first start with the drawing I send you in the 
email on 03/28/2006 as a reminder of the envisioned beam pipe design:

I will not repeat the explanations but let me just say that I changed 
the legend a bit. The numbers on the beam pipes in the drawing refer to 
the so called standards NW320 and NW250. In the meantime, I learned that

these pipes do not have a diameter of 320mm and 250mm, respectively. So 
whenever I wrote 320mm or 250mm that should be NW320 and NW250 instead. 
But that doesn't change anything for the design since we end with a 
NW320 beam pipe and John and Eric will have a connector to this standard

size (therefore we shipped a NW320 flange).

Okay now the remaining question was to determine the distance from the 
last quad to the target, or better to that from the end of the last part

of the beam pipe that will not be exchanged. That is just the part which

transverses the last quad, so the most left NW320 in my upper picture.To

understand our measurement, let me post a schematic drawing of the area:

To clarify this picture some general remarks first:
- All measurements are given in mm
- Black distances are our measurements with a folding rule
- Green measurements are reference points from the survey group. Note 
that the direction of the beam corresponds to their x-axis. Their origin

is nearby the separator upstream but that's fine since we only need 
differences (The delta x are calculated by me using their values).
- This picture shows the simplified momentary beam pipe arrangement as 
used for the MuCap experiment

We have four references from the survey: the two markers EH1101 and 
EH1102, the back wall and the target position. In preparation to 
determine the distance of interest we measured from the beam pipe:
1) the direct distance to the wall (693mm + 4274mm). Due to spatial 
limits we had to split this one into two steps.
2) the distance to reference point EH1102 (693mm + 269mm + 519mm). Here 
we used some edge of a metal ground plate being quite perpendicular to 
the side wall.

Using the apropriate delta x values, it's possible to determine the 
distance from the beam pipe in the last quad to the target. The results 
are shown in red and regarding the not too precise measurements with the

flexible foding rule they agree quite well. So the new design needs to 
have a length of ~1492mm to the target. But from the first drawing we 
know that parts of that are used for the installation of the gate valve 
in between, namely:
- 2 NW320-250 reducers (2 x 90mm)
- 80mm for the gate valve
- 160mm for the pump system
- 35mm for the sealing rings (5 x 7mm)

That's in total 455mm. Therefore, the Illinois part should be 
constructed such, that from the left corner of the special reducer 
(NW320 to 8") to the target we have a distance of 1492-455= 1037mm.

I recommend that you should double check my calculations for obtaining 
this final result.
If necessary I can also try to find out the space behind the MuLan ball 
in order to see if we can take out the 8inch beam pipe at the back side.
Hope you could follow my description,
greetings
Peter

PS: I'll post that later to the elog so that the others might also have 
a look at it.

Attachment: MuonCorridor Sketch.ppt
Description: MS-Powerpoint presentation

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