19/6/2002 S. Patricelli Muon week 1

Status of RPC production (1)

The leading production for RPCs is the the gas volume production at GT. All other items (strip panels, FE boards mounting, support panels, unit’s assembly, test) must follow this schedule.

An INFN committee coordinates this production for all experiments which use or plan to use RPCs (ATLAS, CMS, ARGO, OPERA, ALICE, LHCB).

Production according to this plan started in January 2002.

19/6/2002 S. Patricelli Muon week 2

Status of RPC production (2)

In February 2002 it was found that backelite produced after an upgrade of the production plant did not have the same gluing properties as the previous one.

ATLAS was able to continue with production till April 4th using bakelite produced in 2001.

Many different analysis (optical, chemical, XRF, infrared) have been done to understand the different properties of the bakelite surface but we do not have, at the moment, a clear answer.

19/6/2002 S. Patricelli Muon week 3

Status of RPC production (3)

However a very reliable solution has been found: Bakelite plates, before gluing, go through a “washing machine” (plastic brush + Methyl Ethyl Chetone).

Gluing properties are better than before.

5 ATLAS gas volumes have been produced at the beginning of May to test the effect of the new procedure on chamber performance. With 4 of these one BML-D Unit has been produced an tested in Naples.

19/6/2002 S. Patricelli Muon week 4

Status of RPC production (4)

After these tests we decided to restart production of gas volumes at the end of May.

A new production plan has been prepared by the INFN committee to take into account the delay due to the 2 months stop.

According to this plan we have now the following schedule for gas volumes production

19/6/2002 S. Patricelli Muon week 5

Status of RPC production (5)

This schedule is very tight and is based on the production of 9 gas volumes/day.

However, as demonstrated at the restart of production, we are confident that we will be allocated 11 gas volumes/day.

In this case the production of gas volumes can be completed by the end of Oct. 2003 with a global schedule still compatible with the ATLAS installation schedule.

19/6/2002 S. Patricelli Muon week 6

Status of RPC production today (standard units)

Bakelite plates (PanPla) 7.152 2.671 37%

Gas volumes (GT) 3.576 538 15%

Strip panels (GT+Na) 7.856 1.053 13%

F.E & B.E boards (Microtel+RM2) 44.988 7.181 16%

Readout panels (RM2) 7.856 448 6%

Support panels (sets) (Protvino) 982 198 20%

RPC Units (Lecce) 982 42 4%

19/6/2002 S. Patricelli Muon week 7

Other items - Support panels

The RPC groups decided to replace the paper honeycomb with aluminum honeycomb for pre-bent support panels. This solution increases the robustness and the long-tern reliability of the RPC mechanical structure.

Plane panels are still done with paper honeycomb.

19/6/2002 S. Patricelli Muon week 8

More details (mounting of F.E. boards)

Much of the present delay of F.E. boards mounting on strip panels is due to the last delivery of F.E. boards.

In Rome 2 there are many panels with B.E. boards mounted waiting for F.E. boards.

Next two-three months will be crucial to understand if the required “cruise” speed is achievable.

19/6/2002 S. Patricelli Muon week 9

Gas volume production January - June 2002

Produzione dal 7 gennaio al 14 giugno 2002

0

50

100

150

200

250

300

350

400

450

500

07-gen-02 06-feb-02 08-mar-02 07-apr-02 07-mag-02 06-giu-02

Ga

s v

olu

me

s

19/6/2002 S. Patricelli Muon week 10

Gas volume production 2002 - 2003

Produzione 2002-2003 approvata dalla CSN1

0

500

1000

1500

2000

2500

3000

3500

4000

07-gen-02 07-mag-02 04-set-02 02-gen-03 02-mag-03 30-ago-03 28-dic-03

Gas

vo

lum

es

19/6/2002 S. Patricelli Muon week 11

Gas volume schedule

ID Nome attività

1 Done

2 BOS B

3 BOL B

4 BML D

5 Gluing problem

6 BML

10 BMS

17 BOL

21 BOS

07/01 04/04

03/06 14/01

15/01 30/04

02/05 28/08

29/08 16/12

set nov gen mar mag lug set nov gen mar mag lug set nov gen mar2002 2003 2004

Includes 10% sparesHolidays taken into account

19/6/2002 S. Patricelli Muon week 12

Global efficiency

19/6/2002 S. Patricelli Muon week 13

Local efficiency

(2 gap) EST (1 gap) WEST (1 gap)

19/6/2002 S. Patricelli Muon week 14

Inefficient regions

HV = 10400 V

19/6/2002 S. Patricelli Muon week 15

Cluster size

19/6/2002 S. Patricelli Muon week 16

RPC global schedule

ID Nome attività

1 Strip panels production

2 Electronics mounting on panels

3 Gas volumes production

4 Support panel production

5 RPC Units assembly

6 RPC Units test

7 RPC-MDT assembly at CERN

8 Installation in ATLAS

30/09

27/02

31/10

31/10

31/03

29/06

01/09 29/10

03/01 31/05

gen apr lug ott gen apr lug ott gen apr lug ott gen apr lug ott gen apr lug ott2002 2003 2004 2005 2006