Power pulsing of AFTER
in magnetic field
D. Attié, P. Colas, E. Delagnes, M. Riallot
M. Dixit, J.-P. Martin,
S. Bhattacharya , S. Mukhopadhyay
i r f u
s a c la y
Linear Collider
Power Distribution & Pulsing Workshop
May 10th, 2011
Introduction
• Proposal:
– Use existing electronics and adapt it for power pulsing to
read out the detector pads:
• Integrated T2K electronics
• Having a two power states: low and nominal
• Switching between state as fast as possible
– In parallel, use constant current charging circuits to
readout the detector mesh (see J.-P. Martin’s talk)
– Using an 55Fe source to monitor the signal and gain
– Operating in 5T magnet in DESY
[email protected]
May 10, 2011 - LC Power Distribution and Pulsing Workshop
2
AFTER-based electronics
1 FEM, 6chip
FECs,
chips :1728 ch
• AFTER
(72 24
channels/chip)
from T2K experiment:
–
–
–
–
–
–
12-bit ADC,
6 channels
multiplexed
low-noise
(700
e-) pre-amplifier-shaper
Zerowave
Suppression
(FPGA)
full
samplingcapability
by SCA (511
time bins)
~14-25
120
fC tomW/channel
600 fC tunable gain
100 ns to 2 μs tunable peaking time
pulser for calibration
25 W, 5V at 5 A (0,5 W/chip)
AFTER chip wire bonded
FEC
[email protected]
May 10, 2011 - LC Power Distribution and Pulsing Workshop
3
Front-End Mezzanine (FEM)
30 pins
connector
30 pins
connector
30 pins
connector
30 pins
connector
30 pins
connector
30 pins
connector
AFTER
ADC
SRAM
FPGA
Xilinx V5
Xilinx
Prom
Optical
connector
Test Pulser
30 pins
connector
[email protected]
30 pins
connector
30 pins
connector
30 pins
connector
30 pins
connector
May 10, 2011 - LC Power Distribution and Pulsing Workshop
30 pins
connector
4
Design of the integrated electronics
[email protected]
May 10, 2011 - LC Power Distribution and Pulsing Workshop
5
Electronics in DESY 1T magnet
• Picture and events taken last week in DESY with electron beam
• 1726 pads read out by the AFTER-based electronics
• Power consumption of 25W was measured and confirmed
Large prototype TPC
3 GeV electron Beam
[email protected]
May 10, 2011 - LC Power Distribution and Pulsing Workshop
6
Project design
• DESY 5T magnet has to be reinstalled
• Endplate ø 32 cm
• Field cage length not yet defined
• 1 FEM and 4 FEC to readout 1136
pads of 3,7×3,7mm²
E
B
[email protected]
May 10, 2011 - LC Power Distribution and Pulsing Workshop
7
Readout Pads
16 independent HV
connections read out by
constant current charging
system
[email protected]
May 10, 2011 - LC Power Distribution and Pulsing Workshop
8
Low power state conditions
• Specific firmware of the for the FPGA Xilink 5 will be done
• Switch on and off the regulator TPS70402 for powering 3.3 V: t<1 ms
[email protected]
May 10, 2011 - LC Power Distribution and Pulsing Workshop
9
Summary of the plan
• Try power switching on both the (segmented) mesh readout as studied
by Jean-Pierre Martin (see the next talk) and the T2K electronics
• For T2K electronics, power switching might be done on the mezzanine
card (FEM) developed for the 7-module configuration of the Large
Prototype Micromegas TPC
• The test will consist in checking the properties of known X-ray lines
with and without pulsing
• The mechanical effects will be studied by having a large enough
number of channels (1200) and a large magnetic field (5T) close to
realistic conditions
[email protected]
May 10, 2011 - LC Power Distribution and Pulsing Workshop
10