RPCs new schedule & QC results

1. RPCs new schedule & QC results Outline • 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

2. Gas Volumes production plan at GT(Standard Units) S. Patricelli ATLAS TMB

3. Gas Volumes Production details(Standard Units) S. Patricelli ATLAS TMB

4. 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 - Easy • BOS production before BMS - Very difficult • The Global schedule for RPC Units production has to take into account the production status of all other components. S. Patricelli ATLAS TMB

5. Production status - All parts S. Patricelli ATLAS TMB

6. 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. S. Patricelli ATLAS TMB

7. Global RPC schedule Special Units not included in this schedule. We must first reach “cruise speed” in the production of Standard Units. S. Patricelli ATLAS TMB

8. 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. S. Patricelli ATLAS TMB

9. Gas Volume QC - Gluing • Filling up • Localizing rows of spacers with problems. • Localizing the spacer inside the row. S. Patricelli ATLAS TMB

10. 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 8/3672 = 0,2 % spacers not well glued 1/62 gas volume discarded (5 spacers) • Production from 14/6 up to now awaiting test at GT • Future production push test done weekly S. Patricelli ATLAS TMB

11. 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 cm2) of oiled backelite • Items 1 & 3 are sent to the Dept. of Chemistry of Torino University S. Patricelli ATLAS TMB

12. 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. • Only absorption peaks due to linseed oil present S. Patricelli ATLAS TMB

13. 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. Backelite • Only absorption peaks due to linseed and bakelite present S. Patricelli ATLAS TMB

14. 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. S. Patricelli ATLAS TMB

15. 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 mA ( ~ 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 SF6), HV is raised up to 9 kV (@20 °C) while recording the V-I characteristic. S. Patricelli ATLAS TMB

16. Gas Volume QC - Currents Under observation (3/43) T = 32 °C Not accepted (1/44) S. Patricelli ATLAS TMB

17. 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) S. Patricelli ATLAS TMB

18. 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) S. Patricelli ATLAS TMB

19. 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. S. Patricelli ATLAS TMB

20. User Interface (1) Query result to trace back all components in a Unit. S. Patricelli ATLAS TMB

21. User Interface (2) Query result to verify Gas Volume production status. S. Patricelli ATLAS TMB

22. 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. S. Patricelli ATLAS TMB