Upgrade Session Summary Report Upgrade session outline Action Item list Salvatore Upgrade Session Outline Bakelite production and tests gap production and tests ID: 784006
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Slide1
RPC Consolidation WorkshopUpgrade Session Summary Report
Upgrade session outline Action Item list
Salvatore
Slide2Upgrade Session OutlineBakelite production and tests,
gap production and tests, ISR Chamber assembly and mechanical QCCooling upgrade chamber assembly sites (CERN, Belgium, India) Construction Tentative schedule
Slide3In Puricelli
40 large size panels (3.2 x1.6 m) where produced on last may 31st in 1 go their resistivity was measured in firm site 4 days after production and they were grouped in 3 categories (yellow 1-3*10^10, red 3-6 10^10, black out of range both for resistivity mean and sigma value)
19 yellow, 10 red, 11 black. Out of 10 red 2 where thinner than specs.
resistivity measurement was
xchecked
by Pavia few days after on some samples and was fully compatible with Puricelli measurement.
Last Bakelite production batch
3
Slide4GT site used: - 7 good panels + 2 bad ones cut in rectangular shape, delivering to CERN
6 gaps (5 good+1 bad) 4 good panels cut in trapezoidal shape delivering to CERN 3 gaps (3 good). KODEL site used:
- 16 good + 8 bad panels cut in trapezoidal shape delivering to CERN
15 gap
s (15 good).
Last Bakelite production : sharing
4
Slide5Resistivity measurements
@ Pavia Lab5
Slide6Resistivity measurements
@ Pavia Lab6
Slide7Resistivity measurement was performed in november at GIF on GT gaps installed there.
resistivity was calculated with a HV scan on gaps flown with pure Ar (only ohmic component in the current)
result was confirming an increasing factor compatible with Pavia measurements
Resistivity measurements
@ CERN
7
Slide8GAP
SHEET 1
SHEET 2
SUPPLIER
S/N
TYPE
CODE
NUMBER
COLOR
CODE
NUMBER
COLOR
Date
Resistivity (CERN)
source
GT
350
Rectangular 1510 x 1210 mm
1AL32D16P000001p0
1
B1AL32D16P000001p01B19/11/20104.979E+11OFFGT349Rectangular 1510 x 1210 mm4DL32D16P000019p019R4DL32D16P000019p019R19/11/20103.1E+11OFFGT348Rectangular 1510 x 1210 mm4EL32D16P000024p024Y2CL32D16P000022p024Y19/11/20101.411E+11OFFGT347Rectangular 1510 x 1210 mm3EL32D16P000023p023Y3EL32D16P000023p023Y22/11/20101.011E+11OFFGT344R3-Bottom2GL32D16P000032p032Y2GL32D16P000032p032Y22/11/20102.802E+11OFFGT345R3-T-W3CL32D16P000013p013R4CL32D16P000014p014R22/11/20103.89E+11OFF
Resistivity measurements @ CERN
Slide9Kodel Gap production Resistivity measurements are done a second time at
Kodel and the results are compared with the Pavia one. Graphite coating is the second step. Tests about the surface resistivity are perfomed. 50-200 KOhm/square PET film to protect graphite electrodes. Tests Spacer
installation machine is ready. Selection of spacers made by hand and one by one.
Gap
production rate is 10 gaps/day.
Oiling procedure is under test and well controlled Gap Test with HV and gas – 120 hours at 9.4 kV More detailed discussion about the test and QC is needed.
Slide10Gap QC @ CERN Dark current
, gas leaks, spacer pop up, efficiency measurements started at CERN ISR lab. Gas leasks seems OK
Spacer
pop up
tests performed in Kodel and GT were OK, first trials at CERN @20 mbar were showing some failures on some
Kodel gaps. Being distructive tests, we decided
to
perform
them
after
all
other
tests
efficiency, preliminary measuremens show about 90% : this bakelite is good for RPC !
Slide11From 9.1 to 9.6 KV, Imon fluctuates ~0.05uA ~ 17%
Gap QC @ CERN
Slide12Gap QC @ CERN
Slide13ISR Chamber assembly and mechanical QC Successful tests of mechanical
assembly of RE4/3 and RE4/2 prototypes with new mechanics minor errors found and
corrected
Assembly
procedure being documented in a summary document. RB technicians being involved in these assembly
phases. needed to freeze some components (cooling
, HV
connectors
)
plan
tests
of
new
supermodule
mechanic structure next january in P5
Slide14Interface RPC frame
Slide15Changes & improvements but remaining backward compatible
Preassembled 10 degree sector (fast installation & removal)Improved connectors (HV & coax/FEB connection)
Improved cooling also for chamber body (see simulation)
use double ferrule connectors (SAGANA)
Decrease Desy chaining for gas & cooling (per 10 degree)
Internal gas flow unchanged (see simulations)
Improved grounding (alodine screen box)
Slide16Cooling upgrade Request
from CMS to improve present cooling system to secure thermalisazion of the chamber at a
level
of
+/- 1C. First trial with larger copper plates simulated and being implemented. Test results expected
by next weeks. If not satisfactory, CERn group
can
implement
more
manpower
on
this
study
.
Slide17Temp. In PCB plates
Slide18Temp. In tubes and Cu plates
Slide19Temp. In solids without screenbox
Slide20Temp in solids with screen box
Slide2112/7/2010
21Luc Van LanckerRing 3 : Temp solids
Slide2212/7/201022
Luc Van LanckerRing3 : Temp solids backplane
Slide23chamber assembly sites (CERN) CERN
group is entering formally RPC project with specific tasks (bakelite validation, cooling, telescope@cern, 100-120
chamber
assembly
). lab in 904 is being prepared and expected to be ready by
spring 2011.
Slide24Gent RPC LabDecember 3, 2010
RPC Consolidation Workshop24Large RPC lab under construction :
~ 70m
2
area for assembly/testing allocated in old accelerator hall of the institute; additional space for storage of chambers and material available
additional detector R&D room (~45m2) available
air conditioned hut (~19m
2
) for chamber testing in a controlled environment
Assembly area
Climatized room
Slide25Cosmic Test BenchDecember 3, 2010
RPC Consolidation Workshop25Large cosmic
testbench
under construction : 2 X-Y planes (i.e. 4 planes) foreseen of 2x2m
2
85
scintillator bars of 200x10x1.5cm3
ordered from IHEP
Protvino
last year; major delay in delivery due to technical problems in production; first batch of 6 bars arrived a few weeks ago, expect rest of order end of January 2011
Readout of
scintillators
using
Bicron
BC-91A
multiclad
wls
round fibers of 1.5mm diameter; 4 fibers per
scintillator
bar; all fibers available80 Philips XP1911 0.75” PMTs for readout availableVME/C++ based DAQ under developmentFirst 6 IHEP scintillatorsPhilips PMT
Slide26chamber assembly sites (India) No report in WS.
telescope being completed in these weeks, and ready to assemble
/test
chambers
.
Slide27Tentative schedule Urgent to complete
bakelite validation and allow first chamber assembly in 3 sites in next spring
Slide28Order this week additional 10 bakelite panels @ lower resistivity (5*10^9) and monitor for few months Order FEBS in
Pakistan Complete upgrade cooling tests by january Define stategy on HV connectors Order mechanics in China at latest in January
P
repare telescopes in Belgium and CERN
S
ecure DB expert for new productionAction Item lists
28
Slide29Upgrade SummaryBakelite production is now under control.
Resistivity is increasing in time. Tests ongoing.Gap production in Kodel has been very well organized (see Sung Park slides). Ready to produce 660 gaps in 12 months. They can speed-up the production.Mechanical design is ongoing. Cooling design is still under discussion (2 options).CERN, Ghent and India test sites are working hard to be ready as soon as possible next year.Link Board upgrade
still under discussion and not approved by INFN.
Schedule
is under discussion in CMS and RPC. Last chamber ready for summer 2012 ?