Status Brussels GANTRY
Jorgen D’Hondt
CMS Tracker End Cap meeting – 22th of October 2003
 Overview of the pilot run (second week of October)
 aims and achievements
 accuracy on position and angles
 residual features
 Position 3 on the plates
 Outlook
Overview of the pilot run
2 plates were used for R6 modules (plates R6.1 and R6.2) – only position 1 and 2
Supply plate
Aim :
15 modules / 5 days
Achievement :
11 modules / 3.5 days
We stopped due to
crash of hard disk !
Assembly plate
+
+
Mod1
Mod2
Mod3
Residual features
 New capton for the frames (used for the first time)
 increased thickness by ~100mm
 vacuum leakage on both R6 plates
 solved by placing small tape washers ~120mm
(cheap, easy and replaceable)
 but still a small vacuum leak on plate 2 (R6.2) under the sensors
 could be solved relatively easy in the future
 mostly plate 1 (R6.1) was used during pilot run
 In total 11 modules have been assembled
 plate R6.1 : 8 modules (6 valied)
 plate R6.2 : 3 modules (0 valied)
 But…
Pilot run summary
Module #
302000200….
Plate
#
Date
status Remarks/reason
15024
62
04/09 Valid
No rings yet
15025
62
04/09 Valid
No rings yet
15002
61
06/10 Valid
15003
61
06/10 Not
15005
61
07/10 Valid
15006
61
07/10 Not
15007
62
07/10 Not
15008
62
07/10 Not
15009
61
08/10 Valid
15010
61
08/10 Valid
15012
62
08/10 Not
10-12 mdeg, 2 mdeg between sensors
15013
61
09/10 Valid
after assembly/No after curing check
15014
61
09/10 Valid
after assembly/No after curing check
However mod. correctly assembled **
However mod. correctly assembled **
Detector shifted
** faulty status due to 1 badly measured coordinate
Angle precision
sensor
Control Criterion : chooses worst angle out of four…
If pattern recognition fails for one marker, then module not valied !
frequency should be checked and criterion changed
Residual features
 New capton for the frames (used for the first time)
 increased thickness by ~100mm
 vacuum leakage on both R6 plates
 solved by placing small tape washers ~120mm
(cheap, easy and replaceable)
 but still a small vacuum leak on plate 2 (R6.2) under the sensors
 could be solved relatively easy in the future
 mostly plate 1 (R6.1) was used during pilot run
 In total 11 modules have been assembled
 plate R6.1 : 8 modules (6 valied)
 plate R6.2 : 3 modules (0 valied)
 But… after taking the angle feature into account
plate R6.1 : 8 modules (8 valied)
plate R6.2 : 3 modules (0 valied)
successful pilot-run taking into account the residual problems
Precision tests
Precision of the position of the sensors after assembly (x-y plane of GANTRY)
No significant or systematic effect after curing (done on second vacuum pump)
Precision tests
We did the same for some dry assemblies … similar observations
Position 3 on the plate
Problem between 3th and 4th
column in y-direction
Shift calibration file with
more than 3 columns
thanks to G.Pasztor and T.Rusell
Karlsruhe measurement
Gantry measurement
Summary of modules assembled in Brussels
# and type
Plate/
pos.
Date
DB
Internal
External
Precision precision
10 dummy
Old, 1-3
Beg.02
dummy
OK
2 dummy
Old, 1-2
9 real +HB
R6.1, 1-3
End 03
3 real?
R6.1, 1-3
06/03
2 real + HB
R6.2, 1-2
2 dummy
dummy
No check
No check
OK
Graph.
holes
Files exist
No lbl
OK
OK
Position 3?
9/03
OK
OK
No check
R6.2, 1-2
10/03
dummy
OK
No check
8 real + HB
R6.1, 1-2
10/03
OK
OK
waiting
3 real + HB
R6.2, 1-2
10/03
Not yet
Not good waiting
TOTAL: 39
-
Comments
Vacuum leak
Outlook for Brussels GANTRY
 Solve the residual vacuum leak on plate R6.2
 should take some days (in parallel)
 Adapt the calibration file to solve the position 3 problem
 New calibration plate from Bari arrived in Brussels
 re-calibration of GANTRY (~2 days)
 Prepare GANTRY for R5N and R5S
 should take ~3 days
 Prepare GANTRY for R3
 should take ~3 weeks
 in theory we should be ready early december
 Waiting for hybrids till about the same time…