Production of High RPC CMS Forward RPC EDR

Production of High- RPC CMS Forward RPC EDR (10/10/2002 – 11/10/2002) Kyong Sei Lee KODEL, Korea University

Contents 1) Mechanics of High- RPC 2) Chamber Assembly Facilities 3) Chamber Test 4) Cost Estimation 5) Production and Delivery 6) Summary

1. Mechanics of High- RPC RE N/1: 1. 6 < <2. 1

RE 1/1 : Completed RE 1/1 Designed with the Baseline Structure of FRPCs. FE protection Al-panel Covering 4 lowest divisions. Four 32 channel FEBs (128 channels) Patch panel for the HV, cooling, gas feeding, and flat cable connections to link boards. Completed aluminum cover to protect FEBs, cables, and gas line during the installation. Completed RE 1/1 with protective cover sheet Total thickness including the patch panel : 75 mm

RE 1/1 Patch panel 1 st Coaxial cables 3 rd 2 rd 4 th Cooling pipe, cooling base (copper) and, FEBs

Gas and cooling - IN RE 1/1 Gas and cooling OUT Gas line connection for top gaps Blocked for one-inletone-outlet connection for each gap Gas lines HV cables (2. 5 mm)

RE 1/1 Gap supporting blocks

Patch panel connections for RE 1/1 Cooling connections Gas connections LV power connector HV connector Flat cable connectors

RE 1/1 Side view

RE 1/1

RE 2/1 cooling pipe and panel RE 2/1 : Designed with the Baseline Structure of FRPCs. Covering 4 lowest divisions. Eight 32 channel FEBs (256 channels) Patch panel for the HV, cooling, gas feeding, and flat cable connections to link boards. Total thickness including the patch panel : 56 mm

RE 2/1 Side view

RE 2/1 prototype in beam test of Y 2001 – Not exactly same

2. Chamber Assembly Facilities • Most of materials will be prepared by external venders (C-channel, Al-bar, Cooling pipe and panel, Signal readout strip…) • Base panel will be produced within the group • Space and storage area will be shared with the gap production RPC assembly table Base panel production table

3. Chamber Test RPC test stand Gas system Trigger detectors - Plastic scintillation counters NIM, CAMAC for 64 channels Steps • Flushing chambers : 4 hours (with 5 l/h) • Conditioning : 3 hours (with 1 ~ 2 l/h) • Efficiency curves (5 ~ 6 HV points) : 3 hours • Long period test : 2 ~ 3 days Quality control • Spurious hits < 10 Hz/cm 2 (mean) < 30 Hz/cm 2 (max) • Current stability for 2 ~ 3 days • Gas leak • Check-up electrical stability (HV, ground)

• Testing two RPCs/day Along the side RE 1/1 (80 RPCs) : 40 days RE 2/1 (36 RPCs) : 18 days RE 3/1 (36 RPCs) : 18 days RE 4/1 (36 RPCs) : 18 days 94 days • DAQ : CAMAC system 2 Le. Croy 2277 TDC for data 64 channel read-out • 4 gas channels for testing 2 RPCs • Trigger detectors : 4 plastic scintillators (120 cm x 15 cm) + 8 PMT (mounting on both sides of the plastic) Time resolution ~ 500 ps Position resolution ~ 10 cm • Trigger rate ~ 1. 0 Hz per (20 cm 15 cm pixel) • Data per pixel : 1000 events/pixel Two lines near the center Along the side

4. Cost Estimation Section Gaps Angle (Degree) RE 1/1 3 10 1000 80 80, 000 RE 2/1 3 20 1200 40 48, 000 RE 3, 4/1 2 20 1100 80 88, 000 Total Unit Price (CHF) Total Number Total Price (CHF) 216, 000

5. Production and Delivery Schedule Year Month RE 1/1 (Gap) RE 1/1 (RPC) RE N/1 (Gap) RE N/1 (RPC) 1 2 3 4 2 0 0 3 5 6 7 8 9 1 0 1 1 1 2 3 4 2 0 0 4 5 6 7 8 9 1 0 1 1 1 2 3 4 2 0 0 5 5 6 7 8 9 1 0 1 1 1 2

Packing • Custom-made box - consists of 10 vertical slots • Individual packing • Shock watch

6. Summary • Local vendors already have experience producing most of the mechanical parts in RE 1/1 and RE 2/1 • Quality has been excellent • Most of testing facilities are in hand • Funding for RE 1 station has been secured and production schedule has been confirmed by funding agency • Funding for other stations has been committed by funding agency, but has no detailed plan