Transcript RPCs new schedule & QC results
RPCs new schedule
&
QC results
Outline
July 18 2002
Schedule
Gas Volume production schedule Global RPC schedule
QC results
Gas Volume production - gluing Gas Volume production - oiling Gas Volume production - currents Production database S. Patricelli ATLAS TMB 1
Gas Volumes production plan at GT (Standard Units)
Produzione 2002-2003 approvata dalla CSN1
3600 3200 2800 2400 2000 1600 1200 800 400 0 01-gen-02
Layout P Standard Units (no spares) --------->
30-giu-02 27-dic-02 25-giu-03 22-dic-03 July 18 2002 S. Patricelli ATLAS TMB 2
Gas Volumes Production details (Standard Units)
ID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 July 18 2002 Nome attività
Done BOS B (37) BOL B (95) BML D (101) Gluing problem BML
BML D (551) BML A (308)
BMS
BML E (352)
BOL
BMS E (404) BMS D (106) BMS B (36) BMS C (36) BMS C* (52) BMS B* (28) BOL B (330) BOL D (320)
BOS
BOL E (96) BOS B (595) BOS D (56) BOS E (56) BOS C (40) nov dic
07/01
2002 gen feb mar apr mag
04/04
giu lug ago set ott nov dic 2003 gen feb mar apr mag giu lug ago set ott nov dic 2004 gen feb mar apr mag giu lug ago
27/05 10/01 08/01 29/04 28/04 03/09 02/09 05/02
S. Patricelli ATLAS TMB 3
Global schedule
The Gas Volume production sequence still has some flexibility, but not much due to time necessary for material procurement.
BOS production before BOL BOS production before BMS Easy Very difficult The Global schedule for RPC Units production has to take into account the production status of all other components.
July 18 2002 S. Patricelli ATLAS TMB 4
Production status - All parts
RPC Units
Updated July 15th 2002
Support panels (sets) Readout panels F.E & B.E. boards Strip panels Gas Volumes Bakelite 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
July 18 2002 S. Patricelli ATLAS TMB 5
Readout panel production
Concern at present is for the preparation of readout panels (i.e. mounting of F.E. boards on strip panels).
Main reason for the delay is last delivery of Front End boards from Microtel. This was the first large delivery of F.E. boards for BML-D Units now under production.
However: this is also the most time consuming task in the production chain of RPCs.
July 18 2002 S. Patricelli ATLAS TMB 6
Global RPC schedule
7 8 ID 1 2 3 4 5 6 Nome attività
Strip panels production Electronics mounting on panels Gas volumes production Support panel production RPC Units assembly RPC Units test RPC-MDT assembly at CERN Installation in ATLAS
00 lug ott gen apr 2001 lug ott gen apr 2002 lug ott gen apr 2003 lug ott gen apr 2004 lug ott gen apr 2005 lug ott
01/01 28/11 01/01 01/01 27/02 05/02 31/10 01/01 01/01 01/01 01/09 30/07 30/09 29/10 03/01 31/05
Special Units not included in this schedule.
We must first reach “cruise speed” in the production of Standard Units.
July 18 2002 S. Patricelli ATLAS TMB 7
Gas Volume QC - Gluing
The original idea (PRR) for spacer gluing QC was to prepare an external sample and measure the maximum stressing force before breaking. This test was found to be not the optimal solution for gluing QC.
During its production at GT BaBar prepared a machine which allows to measure, on closed gaps, if any spacer is not glued ( push test ).
RPC is laid on a straight table and gas flow is allowed up to a fixed pressure (5 mb).
A row of spacers is “touched” by a series of 660 gr. loads and P is measured continuously.
If one of the spacers is not able to stand that pressure a clear jump in pressure is seen.
July 18 2002 S. Patricelli ATLAS TMB 8
Gas Volume QC - Gluing
atlas_1741.push
6 5.4
5 5.3
4 5.2
3 5.1
2 5 1 0 5 10 15 20
T ime
25 30 35 40 Filling up 4.9
0 10 20 30 Time 40 50 60 70 Localizing rows of spacers with problems.
atlas_1741.spush.row 12 and 13
5.4
5.35
5.3
5.25
5.2
row 12 5.15
5.1
5.05
0 5 10 Time 15 20 row 13 25 Localizing the spacer inside the row.
July 18 2002 S. Patricelli ATLAS TMB 9
Gas Volume QC - Gluing
We started the push test QC on our gas volumes after the “gluing crisis” and the introduction of the “washing machine”.
Every day, before starting production, GT prepares some samples to verify glue polymerization.
Of all gas volumes produced in a day one undergoes the push test.
If one gas volume has more than one spacer not well glued, the full production of that day undergoes the push test.
Gas Volumes with more than one spacers not well glued are discarded.
Production from 28/5 to 13/6 Production from 14/6 up to now Future production 8/3672 = 0,2 % spacers not well glued 1/62 gas volume discarded (5 spacers) awaiting test at GT push test done weekly July 18 2002 S. Patricelli ATLAS TMB 10
Gas Volume QC - Oiling
The facility now at GT allows the simultaneous oiling of at least 40 gas volumes.
When this operation is done: Collect a sample of the (output) oil which has been used Fill up one gas volume to high pressure (max 80 mb). If gas volume not broken (as it happens almost in all cases) the chamber is mechanically opened for visual inspection.
Cut one or more pieces (10 x 10 cm 2) of oiled backelite Items 1 & 3 are sent to the Dept. of Chemistry of Torino University July 18 2002 S. Patricelli ATLAS TMB 11
Gas Volume QC - Oiling - IR analysis
The oil is first polymerized in thin films on inert support (to check the polymerization time) and then IR analyzed to detect if any contaminant is present.
.4
.35
.3
.25
.2
.15
.1
.05
3500 Absorbance / Wavenumber (cm-1) File # 9 = ATLAS11 olio 3 polimerizzato July 18 2002 3000 2500 2000 1500 1000 500 Paged Y-Zoom CURSOR 6/13/02 12:44 PM Res=None S. Patricelli ATLAS TMB Only absorption peaks due to linseed oil present 12
Gas Volume QC - Oiling - IR analysis
The sample of oiled backelite is IR analyzed using a micro ATR (Attenuated Total Reflectance) technique to detect any impurity or sign of oil degradation.
.3
Backelite .2
.1
0 3500 Absorbance / Wavenumber (cm-1) File # 2 = ATLAS07 Atlas #4 P-1102 L July 18 2002 3000 2500 2000 1500 1000 Paged Y-Zoom CURSOR 6/4/02 3:01 PM Res=None S. Patricelli ATLAS TMB Only absorption peaks due to linseed and bakelite present 13
Gas Volume QC - Oiling - IR analysis
For each set on analysis we receive a written report (.doc) which is inserted in the production database.
Gas Volumes oiled up to may 16th have been certified by this test.
For Gas Volumes produced after this date we are waiting for results.
July 18 2002 S. Patricelli ATLAS TMB 14
Gas Volume QC - Currents
For chambers produced with “new” (2002) bakelite we decided to add a new step in the QC control chain before Gas Volumes are assembled in Units.
Before oiling, chambers are flushed in pure Argon, the HV is raised till current reaches 30 m A ( ~ 2.5 kV) and the chamber is monitored for three days. Chambers with anomalous current drift are discarded (0/290 up to now). After oiling chambers are flushed with ATLAS gas mixture (without SF 6 ), HV is raised up to 9 kV ( @ 20 °C) while recording the V-I characteristic.
July 18 2002 S. Patricelli ATLAS TMB 15
Gas Volume QC - Currents
July 18 2002 Not accepted (1/44)
Total Currents
10 9 8 7 6 5 4 3 2 1 0 0 2 4 6
Applied voltage (kV)
8 10 Under observation (3/43) T = 32 °C
Exp component of the current
6 5 4 3 2 1 0 7,9 8 8,1 8,2 8,3
Voltage (kV)
8,4 8,5 8,6 8,7 S. Patricelli ATLAS TMB 16
Production Database (1)
Status of RPC production is reported in the Production Database. All parts are identified by bar-code.
Bakelite plates: Details on all bakelite plates produced (Lecce at PanPla) Data from QC-1 (preparation) form (General Tecnica) Gas Volumes: Data from QC-2 (assembly) form (General Tecnica) Push test results (Napoli at General Tecnica) Current test results (Roma2 at General Tecnica - work in progress) Data from QC-3 (oiling) form (General Tecnica) IR analysis results (Torino University) July 18 2002 S. Patricelli ATLAS TMB 17
Production Database (2)
Readout panels: Results of Burn-in and bench test of F.E. boards (separate DB in Roma2) Mounting of F.E. boards on strip panels (Roma2) Support panels: Production data of support panels (Protvino) RPC Unit assembly: Details of all parts which are in a Unit (Lecce) July 18 2002 S. Patricelli ATLAS TMB 18
Production Database (3)
The Production database is available on the web via a user interface at http://pcatlas2.na.infn.it (link from the RPC ATLAS page).
Warning: Data are not all up to date.
Still need some sensibilization of the production sites to transfer data in due time.
Some problems with 2001 production data which we are trying to recover.
QC results are accessible with
queries
via the user interface. Some are already implemented. Others are now being developed.
July 18 2002 S. Patricelli ATLAS TMB 19
User Interface (1)
July 18 2002 S. Patricelli ATLAS TMB Query result to trace back all components in a Unit.
20
July 18 2002
User Interface (2)
S. Patricelli ATLAS TMB Query result to verify Gas Volume production status.
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Conclusion
Gas Volume for ATLAS production schedule is still compatible with ATLAS schedule.
Main concern at the moment is the schedule for Readout Panel production.
Time for special chambers still to be “allocated” in the schedule. This will be done only after “cruise speed” for Standard production is reached.
QC in Gas Volume production with new technique is under control for gluing, oiling and currents. Production Database needs some update for 2001 production (mostly bakelite).
All QC results as described are in the D.B. Need to implement more queries (web interface) to extract statistical information.
July 18 2002 S. Patricelli ATLAS TMB 22