Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari RPC Electronics: Technical RPC Electronics: Technical Trigger Trigger Flavio Loddo I.N.F.N. Bari On behalf of the RPC-Trigger group Outline: •RPC-based Technical Trigger • Principles of operation • Implementation • MTCC readiness
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Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari RPC Electronics: Technical Trigger Flavio Loddo I.N.F.N. Bari On behalf of the RPC-Trigger group.
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Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
RPC Technical TriggerRPC Technical Trigger
Goal of this project is to produce an RPC-based cosmic ray trigger for the Commissioning of RPCs, the Cosmic Challenge and later
running of CMS as Technical Trigger
The project started recently, when electronics and cabling in the cavern were defined and frozen
↓
Use existing infrastructure (as much as possible) and don’t introduce major modifications to the existing electronics (Link Boards)
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
Block Diagram of RPC Electronics full Block Diagram of RPC Electronics full chainchain
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
RPC Cosmic trigger
Phase I: Sector Trigger for testing RPC (and DT) during Commissioning and MTCC
Phase II: Technical trigger to be used during off-beam periods for detector calibration
RBC (RPC Balcony Collector)
RBC + TTU (Technical Trigger Unit)
RPC Technical TriggerRPC Technical Trigger
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
RPC Technical TriggerRPC Technical Trigger
LBBox
RBC
LBBox
LBBox
RBC
LBBox
LBBox
RBC
LBBox
LBBox
RBC
LBBox
LBBox
RBC
LBBox
LBBox
RBC
LBBox
1 RBC/ 2 sectors
UXC area
Barrel Wheel
USC area
30 Optical Fibers
Receivin
g
pan
el
TTU
TTU
TTU
TTU
TTU
ReadoutCrate
6 Fibers/wheel
Fiber
RBC (RPC Balcony Collector)
Technical Trigger Unit
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
RBC ImplementationRBC Implementation
•The RPC signal cables (LVDS) are connected to the Link Boards (LB) for synchronization, data compression and optical conversion
•Each LB reads 96 strips (1 bi-gap = half/chamber) and can produce 1 OR to be used for our goal
•Each LBBox (LBB) houses 13 or 15 (sect. 4 and 10) LBs of 1 Barrel Sector
•The LBBs are distributed in the 30 periphery racks in groups of 2:
one odd sector and one even sector
We can house 1 RBC/rack 1RBC/2 sect 30 RBCs in total
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
RPC LBBoxRPC LBBox
•LBB's slots 11, 12, 13 are always free in barrel•CSC connector is not used in barrel•at least one I2C output is not used on backplane
RBC will be located on slot 12 of LBB of all odd sectorsRBC_fake will be located on slot 12 of LBB of all even sectors
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
RBC Main FeaturesRBC Main Features
•Receive 2x13 (or 15) ORs from LB (LVDS)
(OR of 96 strips (1 bi-gap = half RPC))
•Mask noisy/dead Ors
•Produce Sector Trigger (LVDS), with selectable Majority level
•Force selected ORs to be in the coincidence, to
increase trigger selectivity
• Introduce latency for synchronization
•I2C Interface
•Transmit input OR optically to Counting Room (GOL)
RB4
RB3
RB2_OUT
RB2_IN
RB1_OUT
RB1_IN
Generic Barrel Sector
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
RBC PCB LayoutRBC PCB Layout
FPGA
Optical transceiver
Z-Pack Conn.
GOL •10 Layers PCB 14x14 cm2
(small board to save money)
• to be housed on Mother Board, fitting LBBox dimensions
JTAG Conn.
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
RBC Motherboard LayoutRBC Motherboard Layout
Backplane connector:•3.3 V•2.5 V•GND•I2C
Low profile connector (5 mm) to connect RBC to Motheboard
Front side
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
QuantitiesQuantities
• 30 RBC (10 layers PCBs 14x14 cm2)
• 30 RBC Mother Boards (2 layers PCBs 16x46 cm2)
• 30 RBC_FAKE (4 layers PCBs 2x4 cm2)
• 60 RBC_FP1 (4 layers PCBs 18x14 cm2)
• 60 RBC_FP2 (4 layers PCBs 18x14 cm2)
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
Two RBC (RPC Balcony Collector) can
be used during the MTCC to provide two
Cosmic Triggers to the LTC (or PSB),
based on the coincidence of half
chamber ORs coming from the LBs
RPC Technical Trigger for MTCCRPC Technical Trigger for MTCC
W+2: Sect. 10 Sect. 11
Sect.10-11 patternsOR
Trig_+2
W+1: Sect. 10 Trig_+1
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari
• Because of long distance (150 m) between Detector and “Green Barrack” during MTCC, we could send the Technical Trigger in LVPECL, that is more robust than LVDS and introduce optocouplers to cut ground loops
• This configuration was succesfully tested in Bld. 904 with both LTC and
PSB
• Preliminary latency estimate: 45 bx
RBC testing for MTCCRBC testing for MTCC
RBCLVDS-
LVPECL Transceiv.
LVPECL Receiv.
LVDS Driver
LTCOr PSB
150 m (shielded twisted cable)
Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari