1. D. Attié, P. Colas, E. Delagnes, M. Riallot M. Dixit, J.-P. Martin, S. Bhattacharya, S. Mukhopadhyay Linear Collider Power Distribution & Pulsing Workshop May 10th, 2011 Power pulsing of AFTER in magnetic field

2. Introduction 2 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop 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 55 Fe source to monitor the signal and gain – Operating in 5T magnet in DESY

3. AFTER-based electronics 3 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop 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 μ s 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 FEC AFTER chip wire bonded

4. Front-End Mezzanine (FEM) 4 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop 30 pins connector 30 pins connector 30 pins connector 30 pins connector 30 pins connector 30 pins connector 30 pins connector 30 pins connector 30 pins connector 30 pins connector 30 pins connector 30 pins connector FPGA Xilinx V5 ADC SRAM Test Pulser Xilinx Prom Optical connector AFTER

5. Design of the integrated electronics 5 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop

6. 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 Electronics in DESY 1T magnet 6 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop Large prototype TPC 3 GeV electron Beam

7. Project design 7 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop 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

8. Readout Pads 8 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop 16 independent HV connections read out by constant current charging system

9. 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 Low power state conditions 9 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop

10. 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 Summary of the plan 10 David.Attie@cea.frMay 10, 2011 - LC Power Distribution and Pulsing Workshop