Issues of the Meeting
Yutaka USHIRODA, KEK
Jul. 22, 2012
12th B2GM
Outline
• Schedule
– Accelerator construction schedule [conclusion]
• QCS construction status
• Beam background crisis (Feb.) and mitigation measure
– Commissioning scenario and BEAST [discussion]
• Other issues
– Beam background, radiation tolerance (safety
factor/tuning knobs)
– Readiness of TOP, PXD, KLM
– Mechanical design of SVD
– Cables and service space
– Grounding
2011/11/11
2
Schedule
2011/11/11
3
Baseline Schedule (Sep. 2011)
2015
2014
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
BEAST
Out
QCS instal.
1
Physics Run
In
magne
t
12
In
magne
t
NEW!
QCS field
On Beam Line
Pit
Pit
On
GCR
TOP
ready
PXD
ready
TOP instal.
CDC instal.
E-cap
instal.
VXD
installation
Baseline considered in Sep. 2011
QCS schedule was too tight (already)
BEAST with QCS followed by detector installation
4 months for BEAST is also very tight
Two months for TOP is too generous
Feb. 26, 2012
4
2
Feb. 26, 2012
ARC told us to be careful.
There was a Beam Background crisis.
 What is the current status of Beam Background and QCS construction?
5
Can we start QCS-R construction from now??
Issues to be cleared
• We understand beam background well so that there will
be no further request of significant design change in
 H. Nakayama, beam
QCS-R
background session
• We are confident that QCS-R construction can be
started without waiting for feedback from QCS-L
construction
• There will be meaningful gain in schedule by launching
two QCS productions in parallel (we have enough
capability in equipment and manpower to do in parallel;
we have no other bottleneck)
 N. Ohuchi, B. Parker,
Y. Ohnishi
If any of the above three is negated, we should not start
QCS-R now, and we have to reconsider our global schedule.
Feb. 26, 2012
6
2015
6
2014
6
7
8
9
10
11
1
2
3
4
5
7
8
9
10
11
12
In
install
install
2
3
4
5
2016
6
7
8
9
10
11
remov
e
remov
install
install
e
extrac
t
install
QCS field
meas.
On Beam Line
Pit
"G"CR
E-cap
install
ation,
cablin
g,
test,
…
GCR
open
Eyoke,
pull
out Ecap
push
in Ecap,
close
Eyoke
CDC
install
ation,
cablin
g, test,
...
TOP
ready
TOP
install
ation,
cablin
g,
test,
...
PXD
ready
Feb. 26, 2012
12
Physics run (full fledged)
QCS install,
cool
QCS
ready
QCS integration
1
run (w/o VXD)
variable (3-6months)
BEAST (w/o solenoid)
Global Operation
Belle roll-out/in
concrete shield
Magnets behind QCS
Field measurement
Global Position
12
VXD
installation,
cabling, test,
…
7
2015
6
2014
6
7
8
9
10
11
1
2
3
4
5
7
8
9
10
11
12
1
BEAST (w/o solenoid)
Global Operation
Belle roll-out/in
concrete shield
Magnets behind QCS
2
3
4
5
2016
6
Physics run (full fledged)
7
8
9
10
11
install
install
QCS install,
cool
QCS
ready
QCS field
meas.
On Beam Line
Pit
"G"CR
GCR
E-cap
install
ation,
cablin
g,
test,
…
CDC
install
ation,
cablin
g, test,
...
TOP
ready
TOP
install
ation,
cablin
g,
test,
...
PXD
ready
Feb. 26, 2012
12
Physics run (full fledged)
In
QCS integration
Field measurement
Global Position
12
VXD
installation,
cabling, test,
…
8
Commissioning strategy
• Vacuum scrubbing without QCS/Belle solenoid
• What to install after completion of what?
– TOP, CDC, E-cap installation after vacuum scrubbing?
– VXD installation after understanding background level
with QCS/Belle solenoid??
Strategy depends on what we will be able to learn about
machine, and how soon
 BEAST session (Vahsen, Tanaka)
Feb. 26, 2012
9
Start of physics run
• Dec. 2015 (baseline Sep. 2011)
• Can we relax the schedule?
• Can we start physics run w/o VXD?
 physics session (Trabelsi, Golob)
Feb. 26, 2012
10
Other issues
2011/11/11
11
Beam background and radiation tolerance
• Good progress in simulation. All the efforts highly
appreciated
• In the end, simulation is just simulation. We need
safety factor to be safe in reality
Q: What is the current best knowledge by simulation?
Q: What are still missing in the simulation?
Q: What are the safety factors?
Q: (If not enough margin) Are there any “tuning knobs” in
detector parameters to live longer?
 Beam background session (Nakayama)
2011/11/11
12
Mechanical design of VXD
• Was not ready in March B2GM, but steady progress
seen since April.
– First drawing without geometrical conflict obtained in
April
• Improving design in sense of
– Better heat removal
– Easiness (feasibility) of installation
– Mechanical stability
 VXD mechanical designers meeting (Tanaka)
Feb. 26, 2012
13
Cables, pipes and service space
• Ideas on cables and pipes became more and more
concrete
– If not, show any preliminary ideas
• Area around QCS has changed for particle shield
(even narrower space for service)
• Slots through B/E-KLM gap and space around F/Bendcaps are also being claimed
 IR mechanics and service space (Tanaka)
 Service space around endcap/endyoke (Adachi)
• Space inside EH
• Space in exp. hall ( Ushiroda)
2011/11/11
 DAQ session (Itoh)
14
Readiness of TOP/PXD/KLM/…
• TOP/PXD/KLM were on the critical path
(depends on the global schedule)
(depends on how you declare the progress)
Feb. 26, 2012
15
Grounding
• Different grounding and shielding plans from
different sub-detectors
• Compile plans and draw global picture
• Possibly improve (within practical boundary
conditions)
• Set the baseline strategy
 Grounding session (Arteche)
2011/11/11
16