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’m here to present a TPC review Linear Collider Power Distribution & Pulsing Workshop May 10th, 2011

May 10, 2011 - LC Power Distribution and Pulsing Workshop 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 David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop

AFTER-based electronics AFTER chip (72 channels/chip) from T2K experiment: low-noise (700 e-) pre-amplifier-shaper full wave sampling by SCA (511 time bins) 120 fC to 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) 1 FEM, 6 FECs, 24 chips :1728 ch 12-bit ADC, 6 channels multiplexed Zero Suppression capability (FPGA) ~14-25 mW/channel AFTER chip wire bonded FEC David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop

Front-End Mezzanine (FEM) 30 pins connector FPGA Xilinx V5 ADC SRAM Test Pulser Xilinx Prom Optical AFTER David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop

Design of the integrated electronics David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop

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 David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop

May 10, 2011 - LC Power Distribution and Pulsing Workshop 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 David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop

May 10, 2011 - LC Power Distribution and Pulsing Workshop Readout Pads 16 independent HV connections read out by constant current charging system David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop

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 David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop

May 10, 2011 - LC Power Distribution and Pulsing Workshop 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 David.Attie@cea.fr May 10, 2011 - LC Power Distribution and Pulsing Workshop