CERN Info Point 2 Status Cosmic data taking finished. SM-II - PowerPoint PPT Presentation

CERN Info

Point 2 Status • Cosmic data taking finished. • SM-II (sector 0) Un-installation � done. Disassembly � done. Problems investigated � Taku’s slide. • SM-I (sector 8) un-installation � done. Disassembly � started. will finish on Wednesday. • Sector 17 Gas leak investigation � Nora’s slide. • Mini-frame PP0 (pre-trigger) disconnection � done. • Wiener campaign nearly end (last 12 went Wiener). • Thanks for big efforts: Kengo, Sylwester, Kenshi, Nora, Joerg, StefanS, Yvonne, Dousatsu, Masahiro, Taku, Thomas, Kathrin, Tom, Kai, Chilo, Jochen, Markus, Ana, Bernd, Peter, Tobias, Norbert.

Detector Status by End of Shutdown (Arturo) 3/5 PHOS ALICE Status 8/18 TRD 18/18 TOF 7/7 HMPID 1/6 EMCAL 4 5 3 6 2 7 1 8 0 9 17 16 10 15 11 14 12 13 4 0 1 3 2

Point 2 Plan • SM-I (sec. 8) disassembly finish = Wed. • Shipping SM-II (and part of SM-I) chambers to GSI = Wed. • SM-III In the rotator already. Move to CR on Thu. and start on Fri. Sec. 7 final preparation ~ Nov. 17. Installation to sec. 7 = Nov. 24, 25. Service connections & commissioning = Nov. 26, till end of Dec. • Shipping rest of the chambers & 2 (or 1?) hulls … when SM-VI arrives. • SM-VI Arrival … End of Nov. (expectation). Testing … whole Dec. Installation to Sec. 1 … end of Dec. or beg. Jan. • Sec. 8 LV patch cords installation ~ Nov. • SM-I and SM-II Sec. 8 + 0 installation ~ end of Feb. • Gas system leak tightness tests necessary (scan all sectors in BSF) ~ Nov.. • Cooling solving for Sec. 10. • Commissioning and cosmic runs with sectors 0, 1, 7, 8, 9, 17 (+10, 16?). • End of shutdown … May 1st.

Nora ’ s slide

Leak‐Hun)ng
in
SM
17
 Tests:
 1.
By‐passing
all
layers
(all
inlets
into
manifold)
 
 all
)ght
–
leak
s)ll
there
 2.
Disconnec)ng
exhaust
 
 result:
leak
must
be
in
exhaust
between
manifold
and
gasplant
 
 
 didn’t
find
it
so
far
b/c
of
underpressure
 3.
Replacing
aluminium
ring
of
exhaust‐connec)on
at
babyframe
with
O‐ring
 
 leak
s)ll
there
 4.
Sniffing
tubes
and
connec)ons
(also
the
welding)
in
CR5
 
 couldn’t
find
any
leak
 5.
Disconnec)ng
exhausSube
totally
 
 system
)ght
‐>
tube
must
be
the
problem
 6.
Replacing
tube
 
 system
)ght
(FINALLY!!!!)
 
 found
hole
in
the
tube
‐>
happened
(probably)
b/c
of
spark
from
TOF
power
 Connec)ng
SM
back
on


Taku ’ s slide

SM00 disassembly and check � List of problems in SM00 TRD weekly meeting on 13.10.08

Investigation of the problems � Cooling problem: � S2L5 S3L5 � We found strong bent of cooling tubes � http://phenix.cns.s.u- tokyo.ac.jp/~gunji/tmp/cooling_pipes_sm00l5.pdf � Optical output problem: � S0L2A � fiber (20) broken � confirmed with other ORIs and other fibers � S3L2A � fiber not connected at patch panel behind � No problem after connecting fiber at patch panel � S4L4AB � fiber problem � confirmed with other ORI and other fibers � S4L5B � seems OK at surface test

Investigation of the problems � DCS board dead: � S2L5 � flashing firmware using JTAG failed with some errors � Need to investigate more detail in KIP � New problem happened during disassembly � DCS board on S3L5 can never be on. � 0.8V instead of ~5V at the input of DCS board � PDB is reason (no power from PDB to DCS of S3L5) � confirmed that DCS board is fine by using another line of the power.