RPC Technical Trigger RPC Technical Trigger
Flavio Loddo I.N.F.N. Bari
on behalf of Barrel RPC Collaboration
RPC Technical Trigger RPC Technical Trigger
RPC Cosmic trigger
Phase I: Sector Trigger for testing RPC (and DT) during Commissioning
Phase II: Technical trigger to be used during off- beam periods for RPC (and other detectors)
calibration
RBC (RPC Balcony Collector)
RBC + TTU (Technical Trigger Unit)
Block Diagram of RPC DAQ
Block Diagram of RPC DAQ
RPC LBBox RPC LBBox
In Barrel LBBox it is unused
It can provide the OR of 96 strips (half RPC)
Phase I: RBC (RPC Balcony Collector) Main Features Phase I: RBC (RPC Balcony Collector) Main Features
•Receive 2x13 (or 15) ORs from LB (LVDS) (OR of 96 strips (1 bi-gap = half RPC))
•Produce Sector Trigger
•Mask noisy/dead Ors
•Force selected ORs to be in the coincidence to increase trigger selectivity
•Majority level selectable between 1 and 6
•I2C Interface
•Re-Transmit input OR electrically (LVDS) to TDC
RB4
RB3
RB2_OUT
RB2_IN
RB1_OUT
Generic Barrel Sector
RBC Block Diagram RBC Block Diagram
LVDS-CMOSconverter
GOL
QPLL Deskewed HF clock
Trigger 1
I2C (from CB)
to Optical PP
HFE4383
40 MHz LHC Clock (from LB)
Programmable Majority Logic
Reconf Controller
CMOS-LVDSDriver
FPGA (Spartan IIE)
13 (15) ORs
Trigger 2 to TDC
13 (15) ORs
From 2 LBBoxes (2 sectors)
1 RBC per 2 sectors 6 RBC/Wheel
30 RBC/Barrel
( Reconfigure FPGA every ~ 5 mins to recover eventual SEU
loss of configuration)
RBC Status RBC Status
FPGA design is under development.
What was done:
1. I2C Interface
2. Masking and Forcing feature
3. Trigger generation (but I’m waiting for further input/suggestions from Users)
Still to do:
1. GOL management
2. Board design ……….
3. ……….
Open issues:
1. Board location
Phase !!: RPC Technical Trigger Implementation Phase !!: RPC Technical Trigger Implementation
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
TTU
TTU
TTU TTU
TTU VME Crate
10 Optical Ribbons
Receiving panel
1 Optical Ribbon/Half wheel
Fiber
TTU (
TTU (Technical Trigger Unit) Block Diagram) Block Diagram (Preliminary)(Preliminary)
HFBR782
TLK2501TLK2501TLK2501TLK2501TLK2501 6x16 bit data
Programmable Majority Unit
TTCrx VME Interface QPLL
VME Interface
Comm. line
Deskewed HF clock
LHC Clock
•Receive optical link from RBCs
•Combine ORs from 1
Wheel (or from Half Wheel)
•……….. Trigger
6 Fibers 6x16 bit data
Cost Estimation Cost Estimation
• RBC: QPLL+GOL+VCSEL ~ 100,00 €
FPGA ~ 100,00 €
PCB ~ 300,00 €
Various ~ 100,00 €
NRE ~1000,00 €
Tot (30 RBC) ~20.000,00 €
• Fibers (6000 m) ~ 6000,00 €
• 5 TTU: ~ 15000,00 €
• 1 VME crate: ~ 5000,00 €
• 1 VME controller (V2728): ~3000,00 €
