proposal for lst-based ifr barrel upgrade
DESCRIPTION
Proposal for LST-based IFR barrel upgrade. Roberto Calabrese Ferrara University Workshop on IFR replacement, SLAC, 11/14/2002. Outline. General Overview Layout geometry Performance Readout methodology Electronics Gas, HV, DAQ Costs Other presentations. General overview. - PowerPoint PPT PresentationTRANSCRIPT
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Proposal for LST-basedIFR barrel upgrade
Roberto Calabrese
Ferrara University
Workshop on IFR replacement, SLAC, 11/14/2002
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Outline
General Overview Layout geometry Performance Readout methodology Electronics Gas, HV, DAQ Costs Other presentations
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General overview
The entire project is driven by the allowed space
The intrinsic efficiency of a standard LST tube is about 90%.
This is due to dead spaces in the LST tubes.
Efficiency is too low for our purposes. Not enough space to put 2 standard layers.
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Possibilities to improve efficiency(given the allowed space)
Option 1: single-layer with a large cell (19x17 mm)
Readout of x and y coordinates from outside strips
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Possibilities to improve efficiency
Option 2: double-layer with a small cell (9x8mm)
Readout of x coordinate from wire and y coordinate from outside strips
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Possibilities to improve efficiency
Option 3: modified double-layer with a small cell (9x8mm)
Readout of x and y coordinates from outside strips
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Detector layout: segmentation of a detector layer
Z strip readout
Layer of LST
Ф strip readout
Z strip signal collection PCB
Z strip signal collection PCB
Ф strip signal collection PCB
(a similar one in the opposite corner)
PCB for cable connectors
PCB for cable connectors
Servizio Elettronico INFN Ferrara
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Detector layout: details of strip signal collection PCB
Servizio Meccanico INFN Ferrara
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Performance
Expected efficiency about 96% Position resolution better than 3 mm (z)
for standard LST better than 9 mm ()
We do not need such a resolution and we can increase the strip width, thus decreasing the number of channels ( MC simulation)
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Detector layout: questions
How many strips?
resolution, cost, space
How many chambers/layer ?
installation, cost
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Detector layout: answer to the questions
We are considering 4 cm z-strips and 4.3 cm -strips
(2 -strips (along the wire)/LST tube)
96 z-strips for each layer, total 6912 z-strips 74 -strips for the outer layer, total 4572 -strips
About 11500 channels of electronics
2 chambers/layer (remove only one corner block at the time), but the
number of z-strips doubles (more cables, but same number of electronics channels) or we need to decouple z-strips from the chambers
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Readout methodology
Only digital readout of strips
Time measurements could be implemented: OR of 16 discriminated pulses Time resolution about 16 ns ( using BaBar reference clock) Implemented with FPGA
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Electronics
FEC gain depends on the shape of the signal FEC ampli cannot be used
Existing FEC: to be modified if we want to use them (when?) the baseline is to use new electronics
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Front end module design : block diagram of the NEW 96 channel (1 view of 1 layer) FEC
96x Amplifier-Discriminator
11us
Dig
ital
One
Shot
Shift/LoadCk_Chain
Data OutSHIFT REGISTER
96 x
Threshold
12us
Dig
ital
One
Shot
11us
Dig
ital
One
Shot
12us
Dig
ital
One
Shot
Shift/Load To the Active Patch Panel
ahead of the FIFO Board
6 x6 x
6 x
Implemented in a single high performance FPGA
(Field Programmable Gate Array)
Cost per channel inclusive of:
-components
-PCB
-crate&power supply
10 € / channel
Servizio Elettronico INFN Ferrara
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Front end module design : schematic of the front end based on Off-The-Shelf components
Power dissipation: 250mW
Servizio Elettronico INFN Ferrara
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Front end module design : analog simulations, effect of strip capacitance and impedance
Simulation of the amplifier/discriminator
output from a 4pC input signal
(0.1mA * 40ns)
Comparator threshold = 50mV
dielectric thickness 0.75mm
a) dielectric FOAM (εr=1)
b) dielectric PTE (εr=3.3)
c) dielectric FR4 (εr=4.8)
a) b)
c)
Servizio Elettronico INFN Ferrara
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Gas system
mass flow control system main gas transport pipe system (existing) final gas distribution and bubbling system.
We assume all the tubes in a layer with a single in/out
Safe gas mixture, like Ar/Iso/CO2 (2.5/9.5/88) (SLD)
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HV, DAQ
Each tube has a separate HV connection
( 2 for a double layer tube) Possibility to use a commercial HV system for LST available
from CAEN (SY546 mainframe + 12 channel boards A548),
150 $/channel
DAQ No change, all signals are FEC-like
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Costs: assumptions
double layer LST with 8mm cells; each layer with a separate HV; each ground returning separately through a measuring resistor 96 strips (40 mm strips) in the z direction; 2 strips per LST in the direction 2 chambers/layer (double the number of z strips signals) 12 active layers
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Costs (I)
Tubes: 30 K$ (setup) 450 K$ ( about 200 $/tube x 2280 double layer tubes)Total cost tubes 480K$
(using single layer tube this cost would be about 300K$)
Strip readout planes240 m2/layer x 6 layers x 50 $/m2 = 72 K$
Signal collection (PCB’s) inside iron 18 K$Total cost readout planes 90 K$
Grand total chambers 570K$ (double layers); 390K$ (single layers)
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Total cost of signal flat cables 146 K$ (outside iron)
15 K$ (inside iron) Total cost of signal flat cable connectors 28 K$ Total cost of electronics 115 K$ Service panels 4 K$ Total cost of LV ground wire 5 K$ Total cost of LV plugs 4K$ TDC system 20K$ (optional)
Total electronics + cables
322 K$ (maximum); 171 K$ (minimum)
Costs (II)
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Costs (III) Total cost of HV wire 23 K$ Total cost of HV banana plugs 9 K$ Total cost of HV power supply+distributors 170 K$ Total cost of mass flow control system 11 K$ Total cost bubbling system 4 K$ DAQ, cooling no expected cost
Total this page 217 K$
Grand total detector 780 K$ 1100 K$
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Addressing the various issues
R&D issues and status Changguo Lu
LST experience and
production issues Mario Posocco
Installation issues Livio Piemontese