From: Rich Smith [rpsmith@fnal.gov]
Sent:
Tuesday, December 02, 2003 3:05 PM
To: Robert Zitoun; Nirmalya Parua;
Abid Patwa
Cc: Harry Melanson; Russ Rucinski; Dmitri
Denisov
Subject: End Calorimeter Locations
Colleagues,
Early in Run II the End Calorimeters were
closed (May 2001). They were opened (twice) during the Jan 2003 shutdown,
and once again during the Fall 2003 shutdown. By means of
permanent monuments on the downstream faces of the EC vessels, the position of
each of the calorimeters is measured by photogrammetric survey after each
closeup.
[When an end calorimeter is closed after
being opened, it is pushed upstream along the centerbeam rails (while
constrained in the E/W direction by a guideway) until the upstream rollers
on the carriage of the vessel contact fixed z-stops on the centerbeam (actually
the fixed carriage of the central calorimeter). The end calorimeter
is then "chocked" in this location by stiff bars lain on the downstream
ends of the centerbeam rails which are wedged against the downstream
rollers, and brackets fixed to the centerbeams. By this means the "closed"
position of the vessel is expected to be quite reproduceable.]
Below are tabulated the positions of the
monuments on the two vessels, first for the May 2001 position, then after each
of the Jan 03 closings, then before the recent opening and after the final
closeup at the end of the fall 03 shutdown.
After the 5 separate measurements I calculate the
standard deviation of each coordinate of each monument, and then the spread in
values for each coordinate of each monument.
Evidently the calorimeters are repositioned to
within a fraction of a millimeter each time. The exceptional spread in the
Z coordinate of ECN (~ 1.5 mm) is essentially entirely driven by
consistent offsets from the first measurement in May 2001 (when it wasn't closed
so tightly?). The spread in the Y coordinate for ECN is probably not
physical but is likely generated by the fits to the centerbeam monuments in each
survey campaign, which treats all coordinates on an equal footing).
In any event, please tell me if you agree that
the data shows that it is not necessary to update the coordinates of the
end calorimeters or the FPS as a function of time in RECO, thanks to the care of
Russ and his team.
Rich
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| In Physics Coords |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ECS (Closed May 01) |
|
|
|
ECN (Closed May 01) |
|
|
| TEVI |
X(+East) |
Y(+Up) |
Z(+South) |
|
TEVI |
X(+East) |
Y(+Up) |
Z(+South) |
| ECS_OUT_1 |
108.21 |
11.95 |
384.33 |
|
ECN_OUT_1 |
-105.91 |
-10.90 |
-388.61 |
| ECS_OUT_2 |
106.55 |
-106.04 |
373.56 |
|
ECN_OUT_2 |
-104.31 |
-127.99 |
-373.26 |
| ECS_OUT_3 |
-104.00 |
-132.71 |
369.08 |
|
ECN_OUT_3 |
106.99 |
-124.34 |
-373.12 |
| ECS_OUT_4 |
-110.16 |
-16.85 |
384.91 |
|
ECN_OUT_4 |
110.92 |
-12.44 |
-386.78 |
|
|
|
|
|
|
|
|
|
| After Jan 03
Shutdown |
|
|
|
After Jan 03 Shutdown |
|
|
| 1/16/03 |
|
|
|
|
1/17/03 |
|
|
|
| ECS_OUT_1 |
108.17 |
11.96 |
384.32 |
|
ECN_OUT_1 |
-105.87 |
-10.94 |
-388.46 |
| ECS_OUT_2 |
106.52 |
-106.04 |
373.54 |
|
ECN_OUT_2 |
-104.27 |
-128.03 |
-373.17 |
| ECS_OUT_3 |
-104.03 |
-132.73 |
369.01 |
|
ECN_OUT_3 |
107.01 |
-124.41 |
-373.02 |
| ECS_OUT_4 |
-110.21 |
-16.86 |
384.85 |
|
ECN_OUT_4 |
110.97 |
-12.50 |
-386.63 |
|
|
|
|
|
|
|
|
|
| After re-opening |
|
|
|
|
After re-opening |
|
|
|
| 1/27/03 |
|
|
|
|
1/28/03 |
|
|
|
| ECS_OUT-1 |
108.18 |
11.93 |
384.34 |
|
ECN_OUT-1 |
-105.85 |
-11.01 |
-388.55 |
| ECS_OUT-2 |
106.52 |
-106.05 |
373.57 |
|
ECN_OUT-2 |
-104.25 |
-128.06 |
-373.22 |
| ECS_OUT-3 |
-104.04 |
-132.74 |
369.05 |
|
ECN_OUT-3 |
107.02 |
-124.45 |
-373.06 |
| ECS_OUT-4 |
-110.21 |
-16.87 |
384.90 |
|
ECN_OUT-4 |
110.94 |
-12.59 |
-386.68 |
|
|
|
|
|
|
|
|
|
| Before Opening |
|
|
|
|
Before Opening |
|
|
|
| 9/18/03 |
|
|
|
|
9/18/03 |
|
|
|
| ECS_OUT-4 |
108.15 |
11.96 |
384.35 |
|
ECN_OUT-4 |
-105.88 |
-10.94 |
-388.53 |
| ECS_OUT-3 |
106.52 |
-106.05 |
373.58 |
|
ECN_OUT-3 |
-104.28 |
-128.04 |
-373.18 |
| ECS_OUT-2 |
-104.04 |
-132.75 |
369.04 |
|
ECN_OUT-2 |
107.01 |
-124.41 |
-373.03 |
| ECS_OUT-1 |
-110.21 |
-16.88 |
384.90 |
|
ECN_OUT-1 |
110.96 |
-12.50 |
-386.66 |
|
|
|
|
|
|
|
|
|
| After Sept 03
Shutdown |
|
|
|
After Sept 03 Shutdown |
|
|
| 10/27/03 |
|
|
|
|
10/27/03 |
|
|
|
| ECS_OUT-4 |
108.13 |
11.95 |
384.36 |
|
ECN_OUT-4 |
-105.86 |
-10.93 |
-388.54 |
| ECS_OUT-3 |
106.49 |
-106.04 |
373.59 |
|
ECN_OUT-3 |
-104.25 |
-128.03 |
-373.20 |
| ECS_OUT-2 |
-104.06 |
-132.73 |
369.05 |
|
ECN_OUT-2 |
107.04 |
-124.41 |
-373.05 |
| ECS_OUT-1 |
-110.24 |
-16.86 |
384.89 |
|
ECN_OUT-1 |
110.99 |
-12.52 |
-386.68 |
|
|
|
|
|
|
|
|
|
| Standard Deviations |
|
|
|
Standard Deviations |
|
|
| ECS_OUT_1 |
0.03 |
0.01 |
0.02 |
|
ECN_OUT_1 |
0.02 |
0.04 |
0.05 |
| ECS_OUT_2 |
0.02 |
0.01 |
0.02 |
|
ECN_OUT_2 |
0.02 |
0.03 |
0.04 |
| ECS_OUT_3 |
0.02 |
0.01 |
0.02 |
|
ECN_OUT_3 |
0.02 |
0.04 |
0.04 |
| ECS_OUT_4 |
0.03 |
0.01 |
0.02 |
|
ECN_OUT_4 |
0.03 |
0.06 |
0.06 |
|
|
|
|
|
|
|
|
|
| Spread |
|
|
|
|
Spread |
|
|
|
| ECS_OUT_1 |
0.08 |
0.03 |
0.04 |
|
ECN_OUT_1 |
0.07 |
0.11 |
0.15 |
| ECS_OUT_2 |
0.06 |
0.01 |
0.05 |
|
ECN_OUT_2 |
0.06 |
0.07 |
0.09 |
| ECS_OUT_3 |
0.05 |
0.03 |
0.06 |
|
ECN_OUT_3 |
0.05 |
0.11 |
0.10 |
| ECS_OUT_4 |
0.08 |
0.03 |
0.06 |
|
ECN_OUT_4 |
0.07 |
0.16 |
0.15 |
|
|
|
|
|
|
|
|
|