RPC Commissioning plan A Colaleo on behalf of

RPC Commissioning plan A. Colaleo on behalf of RPC group Outline • Hardware installation • Commissioning status and plan Tower test Local commissioning Global Runs • Comments A. Colaleo - INFN-BARI

UXC BARREL Status DETE detc CTO R Gas rack com m. Detecttower cables (HV-LVDCS cables) LBoxes Link Boards LV easy crates LV modules RBC Tower cables MAO W+2 ok ok Ok ok W+1 ok ok Ok ok W 0 ok ok Ok ok W-1 All but Sect 1 -7 MB 2 MB 3 ok ok ok Nov Nov Nov W-2 All but Sect 1 -7 MB 2 MB 3 ok ok ok Nov Oct Nov Nov A. Colaleo - INFN-BARI

USC 55 BARREL Status DETECTOR HV cables – patch panel HV Easy HV distributors EASY – majiste – SY 1527 local cable HV multicond. Trigger cables Cable test from UXC-USC W+2 ok ok ok W+1 ok ok ok W 0 ok ok ok W-1 Ready – to install ok ok November W-2 Ready – to install ok ok November Summary : all hardware installed for W+2, W+1, W 0. Connection to the final LV system (Lusin) completed in 3 weeks. A. Colaleo - INFN-BARI

Gas system ready With the temporary system we are running under a limitation of the flow rate (500 l/h max 6 sectors) and several technical difficulties. We are pushing to use as soon as possible the final gas layout. Total gas volume: 18 m 3 Gas mixture: 96. 2÷ 94. 7 % C 2 H 2 F 4, 3. 5÷ 5. 0 % i. C 4 H 10, 0. 3% SF 6 Mixture relative humidity: 40÷ 50% Nominal gas flow: 8 m 3/h (0. 5 volume/h) Gas recirculation (CLOSED LOOP MODE) : 95% Fresh gas replenishing rate: 0. 4 m 3/h (~5%) Number of channels: 360 Plan to have the system ready by middle of November 1. Phase one (with Argon): 1 week starting at beginning of November. One week of work 2. Phase two (with mixture and RPCs): safety procedures for flammable detection system started 3. Running the system in closed loop when HV OFF, switch to open system when HV ON A. Colaleo - INFN-BARI

Trigger system status 4 • 5 11 10 Now 1 Trigger Crate with TBp 1 (W+1) and TBp 2 (W+2) equipped for triggering sector 9 (corresponding to detector sector 10 + sector 11) • Control & DAQ Crate with 2 DCC/FEDs, • Sorter Crate 7 new TBs will be tested soon in Bdl 904 and installed in S 1 around middle of November. With the available trigger boards we will be able to equip sector 4 , 5 , 10, 11 of W 0, W+1, W+2. All trigger boards needed for the full system will be ready by middle of December. A. Colaleo - INFN-BARI

Technical Trigger (TTU) RPC-based cosmic ray trigger for the Commissioning of RPCs and later running of CMS as Technical Trigger UXC area LBBox 1 RBC/ 2 sectors USC area LBBox RBC LBBox Barrel Wheel RBC LBBox RBC LBBox RBC (RPC Balcony Collector) 6 Fibers/wheel Readout Technical Trigger Unit Crate TTU Receiving panel RBC Fiber TTU LBBox TTU 30 Optical Fibers Receive optical link from RBCs (RBC providing cosmic Trigger at sector level, with autocoincidence of RPC chambers). TTU combine ORs from 1 Wheel and produce Wheel Cosmic Trigger. Implemented in the Trigger Board (Warsaw), loading the cosmic patterns in the Pattern Comparator A. Colaleo - INFN-BARI

Technical Trigger implementation TTU (1 Wheel) Wheel track finder From 5 TTU 12 RBC Sector Triggers Crate backplane A. Colaleo - INFN-BARI Programmable mixer ORs from 2 sectors 2 Sector Triggers Programmable mixer RBC From 6 RBC ORs from 2 sectors Technical Trigger

TTU trigger algorithm The OR signals are shaped at LB or RBC or TTU level (programmable from 1 to 7 BX) to allow coincidence The TTU track finder selects the longest track crossing one wheel and produces Trigger signal if track length ≥ min_track_len Trackers WHEEL MAP [12 x 15] Sectors x Chambers Initial Seed Finder Inputs Outputs A. Colaleo - INFN-BARI Tracker 1 Tracker 2 Tracker N Trigger Generator Seed Out Array [(Seed, Sector, Track length) x Track Le Trig Out [1] : Wheel Map – OR Map of all Rolls, for each chamber. : Seed Out Array – Chambers hit with the Longest Track Length. : Trig Out – Active High Out , if Length_of_Track > Min_Track_Length.

TTU trigger test -In 904 we tested 1) the optical link between RBC and TTU 2) synchronization between RBC and TTU 3) simulated few triggers from RBC test pulses Still to do: - In 904, next Monday, check the synchronization between Opto-FPGA and PAC-FPGA - In cavern, from Monday to Friday: - Connect fiber from 1 sector (Sect. 10 of W+2) and connect Trigger_Out to local LTC. -Check the quality of both RBC and TTU trigger, 1)using diagnostic readout from the Trigger Board or LB connected to the same sector 1) Study the latency 2) If everything works fine, connect more sectors and see. . With one TTU now available we can have triggers from 2 wheels. A. Colaleo - INFN-BARI

Commissioning steps Steps towards full system commissioning: 1. 2. 3. Local commissioning from chamber to tower : Tower tests with random trigger Local commissioning with cosmics: test with RBC-TTU Commissioning of the full detector/DAQ/Trigger chain Global Runs A. Colaleo - INFN-BARI

Tower test with random trigger Procedure for commissioning of each half a wheel up to the Link Boards Ø Strip Connectivity and Threshold Test Ø Noise rate as a function of HV and Thresholds Ø Monitor of Current and scan as a function of HV W+2, W+1 completed W 0 under test – will be completed by 8 th November (LV modules to be repaired-gas system commissioning) W-1, W-2 waiting the connection to USC (End November? ) A. Colaleo - INFN-BARI

Local commissioning with cosmics First test with RBC-TTU system will be performed next week: -readout through diagnostic readout system from Trigger Boards. -trigger Out to local LTC -local reconstruction for efficiency studies 1) Configure system to trigger with Sect 10 of W+2 2) Configure system to trigger with Sect 10 -11 W+2 3) Configure system to trigger with Sect 10 -11 W+2, W+1 After installation of new trigger boards in Middle of November: 4) Configure system to trigger with Sect 10 -11 -4 -5 W+2, W+1 5) Configure system to trigger with Sect 10, 11, 4, 5 W+2, W+1, W 0 (when 2 nd TTU available) Other steps for commissioning: - Crosscheck with DT trigger. Combined local data taking as during MTCC must be investigated. - Send TTU trigger to Global Trigger as "Technical Trigger“ and readout through Global DAQ. A. Colaleo - INFN-BARI

GLOBAL RUNS • Vertical test post-July GR (sect 10 -11 W+2): • September GR (sect 10 -11 W+1 and W+2): • Data transmission to Trigger and Triggering OK • Read-out and data recording • Unpacking and local reconstruction OK • Some instability of the system to be improved Analyses on data taken are on going A. Colaleo - INFN-BARI OK

Comments • Commissioning with random trigger (Tower test) of 3 wheels in the underground cavern must be completed by first week of November in order to allow the LV reparation and final gas system commissioning. • The full data flow chain (readout from chamber, data transmission to trigger, triggering, data recording in DAQ) for trigger sector 9 in W+2 and W+1 (chamber sect 10 /11) was successfully tested. • Commissioning with cosmic through RBC-TTU system will start soon: test of the system next week. • Provide trigger to DT with TTU and receive trigger from DT in a combined data taking will be possible (as during MTCC). • More and more sectors can provide trigger and readout when new TBs will be ready. Due to the complexity of the trigger setup (connection between Link system and Trigger Boards and in between the board in TC) we must go towards a final configuration of the system. We plan to setup the system in the final configuration for triggering with sect 45 -10 -11 of W 0, W+1, W+2 by middle of November. A. Colaleo - INFN-BARI