Barrel Endcap The RPC System Baseline Six stations in the Barrel Four station in the Endcap up to  = 2.1 Baseline Six stations in the Barrel Four station in the Endcap up to  = 2.1 However, due to technical and financial reasons, only three layers up to  = 1.6 are present in the endcap region. up scope

Low  up-scope Increasing the number of stations the algorithm has a better efficiency and is less affected by noise Two options: Restore the TDR scheme by adding a fourth layer in YE4 Move the actual layer in YE2 to YE4 and add a double-chamber layers in YE2 Two options: Restore the TDR scheme by adding a fourth layer in YE4 Move the actual layer in YE2 to YE4 and add a double-chamber layers in YE2 Also a double station with OR/AND capability could reduce the noise  

TDR vs Double Station TDR: 150 new chambers no noise redaction capability in layer YE2 TDR: 150 new chambers no noise redaction capability in layer YE2 Double Station: 300 new chambers Integration issues are demanding Double Station: 300 new chambers Integration issues are demanding Full Endcap ( Towers 8 – 16 == 1.04 < η <2.10 )

Ghost rate is dominated by RE1 and RE3. Switching off RE2 does not affect the ghost rate TDR Geometry ε = 95 % Rate = 0.05 Hz cm -2 What if the second station (RE2) fails?

The RPC up scope basics Although simulation studies are continuing, at the moment seem reasonable to go with the “single layer” approach. The project should be in the context of the present RPC project, which would then have an “operation” branch and an “up scope” branch. This would ensure the proper expertise in all phases (production, test, installation/integration, commissioning, operation). Strong “European “ involvement and funding should be ensured. Production should be concentrated in very few sites (maximum two). An important CERN/CMS facility for production /quality assurance should be foreseen.

A draft scheme to be discussed

Project partners Main partners should be: Korea, Pakistan, China, India, Belgium, CERN_ CMS*, Italy*. Colombia, Brazil, Egypt, Iran, have expressed interest. Their involvement should be maximized. Korea (KODEL) just ended gap production for PHOENIX. Willing to continue. A more comprehensive involvement in CMS RPC is under way by all the Korean groups. Pakistan was very active in the RPC forward production. Large involvement in operation. At the moment funds are not secured for the up scope * Discussion under way

Project partners China is ready to produce part of the mechanic. India already produced few spare chambers. Willing to continue. Belgium is largely involved in the operation. Strong interest for the up scope. CERN_CMS was coordinating some procurement, final test at ISR, integration, logistic. Its involvement is absolutely needed. Could substantial production fraction take place at CERN? Italy_INFN participation should be secured. Possible contribution could be the off detector electronics.

Gap production HPL procurement in Italy. Some effort needed to reestablish production. Expertise available. A different factory (w.r.t. to the past) has to be involved. Gap should be built in Korea. There we have a team of physicists to follow the validation procedure. GT could as well produce gaps, but we need a team for the production validation. In this case it has to be from CERN (backup solution).

Procurement/Production matrix HPLCoordinated by CERN Gap KODEL Front end India/Belgium Honeycomb panel/stripChina Other mechanic componentsAssembly sites Off detector electronicsItaly HV/LV system India/Belgium Cables Coordinated by CERN Chamber assembly candidates: CERN (904), Belgium (Ghent), India (BARC). Try to further concentrate. Investigate local agencies constraints about “in kind /cash” contribution ratio. Concentrate expertise from other labs in the production host labs

A possible scenario for production Allow minimal production/certification (order 20 chambers) to take place in India and Belgium for students and physicists training Concentrate the core production (order 130 chambers) at CERN under the responsibility of Indian/Belgium groups. Preassembly components at the home labs, but make the final assembly/certification at CERN Built a strong CERN facility under the CMS group financial and operational responsibility Strongly motivate Indian/Chinese/Pakistan/Belgium/Egyptian physicist to joint both chamber production and detector operation at CERN

Cost/Funds ( kCHF) Double stationTDR Detector Front end Off detector electronics HV/LV system Service/infrastructure Cable Logistic CERN Assembly/installation Korea400 Pakistan ? China500 Belgium800 India800 Egypt 200 CERN700 (tentatively estimated, to be discussed) Italy600 (tentatively estimated, to be discussed) 4000 One year old quotations

Concluding remarks A minimal achievement of one end cap installation in the shut-down seems realistic. Also synchronization with CSC installation should be considered. Important integration issues to be studied: chamber installation, cooling up scope, design of gas/HV/LV/signal services. Some re-design of services also at chamber level needed. Objectives of the workshop -Boost local interest in the project -Call for funds availability -Draft project organization -Draft responsibility matrix

Milestones Confirm feasibility of HPL production. Pre-produce 10% of the need and check specifications (Ian) Update the cost estimate with market enquires (Pino, Walter) Review the Integration/Service needs. Steering group with CSC (Salvatore, Walter) Review chamber design for cooling and gas circuit improvement (Luc) Discuss migration of LB system responsibly to INFN (Guido, Austin, Pino) TDR addendum by June?