Tube QA/QC Facilities Tube QA/Q
C Facilities
Tube length measurement
Wire tension measurement
Leak test
Wire position measurement (EM
MI)
End plug contact resistance m
easurement
Dark current measurement
Gregory Tarlé
A
TLAS UM Site Review June 1, 20
00
T
ub
e
T
ub
e
Leng
t
h
/
W
i
r
e Tens
i
o
n Measure
me
nt
Leng
t
h
/
W
i
r
e Tens
i
o
n Measure
me
nt
Magnet
Stop &
El ectrical
Connection
Mitoyo
Li near
Encoder
–10 mm
Electrical
Connection
Length Measurement
Tube placed in Al angle on wir
ing table.
Tube pushed against stop.
Length measured with linear en
coder – 10 m m.
Encoder read out by computer.
Wire Tension Measurement
Tube placed in Al angle on wi r
ing table.
Wire vibrations excited by inj
ecting current
pulse with tube
inside U?magnet.
Induced voltage read out with
computer
DAQ card and Fourier
analyzed to fin d
frequency. Te
nsion error: –
0. 7 g
Gregory Tarlé
A
TLAS UM (
Leak Test Leak Test
Tube filled with 2 atm Helium
Test end plugs with He leak d
etector. Special cap tests for
leaks out end of end plug. He
l
eak det ector sensitivity < 10
?9
bar?cc/s.
Sliding fixture tests tube bo
dy with He sniffer. Fixture is
purged with Nitrogen to remove
backgro und He.
Calibration done with calibra
ted leak (10
?6
bar?c c/s) and built?in calibra
ted leak of H e
leak detector (r
epeated daily).
Endplug fixture
Sliding fixture
Helium Leak Detector
Gregory Tarlé
A
TLAS UM Site Review June 1, 20
00
ElectroMagnetic MIcrometer (EM
MI) ElectroMagnetic MIcromete r (
EMMI)
EMMI measures wire position w
ithin to – 2 m m.
EMMI stand located on leak de
tector stand.
Both ends measured simultaneo
usly.
Tu be rotated 180ű to eliminat
e offset.
Tube rotated 90 ű fo r other vi
ew.
EMMI is li near over a wide ra
nge (> 300 mm).
Measurement takes 2 minutes.
Gregory Tarlé
A
TLAS UM Site Review June 1, 20
00
Endplug Contact Resistance Mea
surement Endplug Contact Resista
nce Measurement
1A current passed between en d
plug and tube.
Voltage drop across end plug
measured with multimeter.
In future, resistance measure
ment will be incorporated in
EMMI stand with computer read
out using DAQ card.
Gregory Tarlé
A
TLAS UM Site Review June 1, 20
00
Dark Current Measurement Dark C
urrent Measurement
Facility handles 1 day’s prod
uction of tubes (48).
Gas jumpers and HV distributi
on cards connected to tubes.
Ar/CO
2
93:7 @3atm.
Tubes with high initial dark
current are treated with revers
e HV.
Computer monitoring of dark cu
rrent overnight.
Gregory Tarlé
A
TLAS UM Site Review June 1, 20
00