AGATA CORE & GROUNDING AGATA

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1 AGATA CORE & GROUNDING AGATA Triple_Cryostat Core_Segments Signals & Pulser wirering & return GND Analog_Digital GND_Plane Regions & Grounding of Mixed Signals PCBs! IDSS LV-PS, HV-PS (new design) Mechanical Design _ AGATA DEMONSTRATOR GROUNDING - GND Plate_Structure, - GND_Frame_Structure (if any?) - Cable Channels (length, 5 or 10m?) -presented by G. Pascovici Padova, Sept , 2005

2 AGATA_Demonstrator ( 5 x TC)_Grounding Capsule & Cold Parts GND 0! Triple Cryostat GND 1 LV-PS (PS_1) one / TC GND 2 FADC-PS (PS_2) GND 3 SLOW_CNTRL_PS (PS_3) GND 4 HV_PS (15x HV + CNTRL) GND 5 the IDSS _GND [ GND 2;3;4] & [1,5]! - 80µV ~ 1.5 * CW / 14bit_ADC or ~ 6*ADC_CW / 16 bit_adc Very good Filtered LV_PS & HV_PS & PS3!! Very Solid SYSTEM_GND and very Solid Connections to the AGATA_DEMO._GND!! ( PS_1 & 2 & 3)!! Solid_Meshing_like Architecture for AGATA_GND N.B. decided (GSI, Feb.2005) The differential transmission line does not improve the S/N ratio at the detector/cryostat place! - only minimizing radiated electromagnetic interference (EMI)!

3 AGATA test cryostat for single detectors* * D.Weisshaar, GSI, Feb. 2005

4 Position of cold preamps for nearest neighbours event * * D.Weisshaar, GSI, Feb. 2005

5 Triple Cryostat Wirering_Grouding CS ~12-15cm CF RF ~8cm MicroMatch (20) CB CD cold part CC 1.8Ω CF RF CB CS D1 G D2 D3 CF RF VACUUM ~8cm x36 x3 x36 6x TRIPLE CORE + PULSER 6x TRIPLE SEGMENTS SEGMENTS MicroMatch (18) MDR(26) LN2 - DEWAR ~8cm GND1 MDR(26) Ro [GND0 <-> GND1] ~8cm GND1 Al ~12-15cm N D 0 GND0 CTT Feed through MicroMatch (20) MicroMatch (20) MicroMatch (18) MicroMatch (18) PTFE MDR(26) ~8cm GND1 Al GND1 - GND_0 Cold part - GND_1 Warm Part Problems: twisted Signal_GND?! - now only for Core! - Segments return GND?! - GND one_both ends?! thermal shunt limitations pulser wirering? Connector problems: - only MicroMatch(20)?! - formerly also MDR-26 GND1 HP-Ge - Detector thermal stress?!

PULSER @ Core & Segments core core segment segment Pulser tr ~ 10 ns Pulser tr ~ 100 ns Problems: - we have to understand the equivalent transfer function of the pulser signal (for

6 Core & Segments core core segment segment Pulser tr ~ 10 ns Pulser tr ~ 100 ns Problems: - we have to understand the equivalent transfer function of the pulser signal (for core and segment)! - tr segments ~ 25 ~15-20 pf - tr core ~ 29 ~ 45 pf - pulser energy resolution ~ 1.25 kev - core / segments ration ~ 20 (24) Pulser core segment tr ~ 250 ns

7 AGATA Detector CSP_Set ( 12 Segments + 1 Core) - a new solid GND concept for the set of (12+1 )_CSPs/ Agata_Detector -G n d -the GND_Layer L a y e r -the Top_Layer

8 ATLAS / AGATA Grounding & Differential Transmission Line (A) ATLAS (B) AGATA MDR Cable Specs. grounded on both sides! Fully Differential! terminated 100 Ohm! the S/N ratio_ (A)/(B)?! (length 5-10m?) Impedance Z o= 100 Ohm +/- 10% Transmitter: 50 Ohm decided ( ) Receiver: 100 Ohm! A_GND / D_GND? NO!

9 AGATA Triple_Cryostat equipped with Triple_Segment & Core_Pulser CSPs Power Supply Signals & Analog GND - 3 x 6 MDR male connectors for the Segment_ CSPs 3 x 1 MDR male connectors for the Core&Pulser_CSP ( NO PS_WIRES to FADC!! ) 1 x 25 D-SUB connector for the Triple_Cryostat_PS decided! ( Cologne, Sept. 2005) - MDR 26-via Male Connector (see also A. Pullia et al Agata Hybrid Preamplifier-White Paper Cable & Interface, 2005) - LV_PS D-SUB 25 Pin Assignment to be decided!! Res. 8 V (?) for higher dynamic range (or 6 V Sense ) decided Res. 8 V (?) for higher dynamic range (or + 6V Sense ) decided

10 AGATA_Triple_Cryostat HV_PS CNRTL Signals 3 x HV_PS - (D1/ D2 /D3 Individual HV_PS) (ISEG_MHP ) - +/- 5 kv (max); - I (out) 0 to 10 µa; - V (set) 0 to 2.5V; - V(U_mon.) 0 to 2.5V - V(I_mon.) 0 to 2.5V Specifications - Stability less then 10(-4) / R load & U(in) - Temp. Stab. less then 5.10(-5)/ grad C - Mechanical: 80 x 40 x 14 [mm] - HV-PS CNTRL lines ( IDSS_ to be decided ) - V (set) (0 to 2.5V / 1kOhm) & slope of (1-10 V/s)?? - V(mon) (0 to 2.5V / 10kOhm) corresponding to (0 to 5 kv_hvout) - I(mon) (0 to 2.5 V/ 10kOhm) corresponding to (0 to 1µA_HV_Iout) -HV_PS D_SUB_15(male) for HV_PS CNTRL (??) Pins 1; 6 & 11 +5V for D1/D2/D3 respectively Pins 2;7 &12 V(set) ditto Pins 3;8 & 13 GND common GND for D1/D2/D3 Pins 4;9 & 14 V(mon) ditto Pins 5;10 & 15 I(mon) ditto

11 AGATA_Triple LN2 Level Capacitive-Preamplifier LN2 Level monitor signal internally, triangular ~1kHz cable twisted shielded (opt. additionally 2x PT_100 with 4 outs) LV_PS ( +/- 12 V) and Analog_GND (only)! Enable/Disable LN2 Cap_Mon. (Opt.)! Specifications: capacitive measurement (very low noise) power consumption less then 25 mw D_SUB 15 female connector for LN2_Level Pin allocation proposal has to be decided! - Pins 1;2, 3;4, 6;7, 8;9 reserved for PT_100 - Pins 11;12 LV_PS (+/-12V) - Pins 13;14 Dif. Output (Linear 0-10V/1 kohm) - Pins 5;10 Analog_GND (Detector GND)! (see also G.Pascovici et al. AGATA LN2 Level _Capacitive Preamplifier)

12 AGATA LN2 Level / Capacitive Preamplifier C d [pf] LN2 [cm] U out [V]

13 First measurements with AGATA-Triple Segment and Core_Pulser Preamplifiers Wirering & Grounding Problems IN2P3_Ganil CSP - INFN_Milano Segment CSPs - C(v) frequency compensation Low Drop Regler_PS requests Rs, stronger HF filter and exact values of LV_PS ( mainly for +/- 6V ) to solve that sense wires needed LV_PS design. IKP Cologne - Core CSP & Pulser - C(v) frequency compensation PS_ Grounding (Motherboard) Pulser amplitude ratio Core/Segments about 20 (25), i.e. for an equivalent ~10 MeV in core one get ~ 400 kev in segments Specifications: AGATA Hybrid Preamplifiers with Pulser (Draft version 1.4-June 2004) by A.Pullia) First results presented at IEEE Nuclear Science Symposium, Roma, The AGATA chargesensitive preamplifiers with buil-in pulser and activereset device by A.Pullia, G.Pascovici, B.Cahan, D.Weisshaar, C.Boiano, R.Bassini, M.Petcu, F.Zocca

14 CSPs for the first AGATA_Detector Core Test Specification IKP-Cologne IKP-Cologne IKP-Cologne (a) (FET_BF862) (b) (FET_IF1320) (Miniball) (FET_IF1320) Sensitivity ( mv / MeV ) ~ 100 mv/mev ( differential ) ~ 100 mv/mev ( differential ) ~ 175 mv/mev ( single ended ) Resolution (Cd= 0pF; cold FET) ~ 600 ev ~ 600 ev ~ 600 ev Slope < 10 ev / pf < 10 ev / pf < 10 ev / pf ( + ev/ pf) [Cd] (cold FET) (cold FET) (cold FET) Rise time < 12 ns ~ 15 ns ~ 15 ns (Cd= 0pF) (warm FET) ( cold FET) ( cold FET) Slope ~ 0.25 ns ~ 0.3 ns ~ 0.3 ns ( + ns/ pf) [Cd] ( < 22 ns / 45 pf ) ( ~ 29 ns / 45 pf ) ( ~ 25 ns / 33 pf ) [100 Ohm] / Power [mw] ~ 2.0V*/ ~290 mw (LM-6171; AD-8057) ~ 2.0V*/~ 290 mw (AD-8057;AD-8012) ~ 4.5V*/~ 450 mw ( + /- 12V) (LM-6172) Charge Sensitive Stage Saturation equiv. 90 MeV equiv. 100 MeV equiv. 100 MeV Open Loop Gain (calc.) > 100,000 ~ 20,000 ~ 20,000

15 AGATA CORE & PULSER Chn Agata_Core_SlowUndGen_Zoom.spc 5000 Co 60 Pulser Co Co 60 ~ 2.15 / 2.26keV Pulser ~ 1.25 kev kev 0

16 AGATA Core & Pulser Agata_Core_SlowAmCoGen6_Zoom.spc Co 57 Chn Am Am 241 ~ 1.25 kev 400 Pulser 400 Pulser ~ 1.25 kev 200 Co kev 0

17 AGATA Core Preamplifier

18 Core Pulser

19 AGATA_Grounding of Mixed Signals PCBs IEEE [ H_Ott_Consultants] Golden Rules: a single GND Plane but - partitioned into Analog & Digital sections - strict discipline of routing only ADC manufacturer GND_Guru : through bridge!! a) the A_GND and D_GND must be connected together externally to the same low impedance GND_Plane with minimum lead length. b) any extra external impedance in the D_GND connections will couple more digital noise into analog circuit through the stray capacitance to the IC (ADC) N.B... For single ADC PCB only! ( ) ( ) )

20 Separate Analog & Digital GND_ Plane Regions H.Ott techtips : - Separate Analog & Digital GND. Plane Regions as an Additional Solution for Noise Isolation for High Resolution fast ADCs ( e.g. 14 bit / 1V pipe line ADCs) -the GND plane is NOT really split it is only properly partitioned!! - NO traces, on any layer, can cross over the isolating slots in the GND_Plane!! - all traces cross only the ADC_bridge_point ( ) ( )

21 AGATA_Grounding Main References (A) Noise and Grounding Books & White_Papers. (1) H.W. Ott, "Noise Reduction Techniques in Electronic Systems,"2nd Edition, by publisher: John Wiley & Sons, 1988, ISBN#: ["The IEEE Bible on EMC" ] (2) John R. Barnes, Electronic System Design: Interference and Noise Control Techniques, New Jersey, Pretice-Hall, Inc.,1987 (3) Morrison, R., Lewis, W. H., Grounding and Shielding in Facilities, John Wiley, 1990 (4) Alain Charoy, Compatibilité Electro-Magnetique (DUNOD),Paris, 2000, ISBN pdf (B) AGATA Analog Front_End Electronics, FADC and IDDS grounding conceptual design. (11) D. Weisshaar AGATA Detector&Cryostat Conceptual Design (12) A. Pullia AGATA Hybrid Preamplifiers with Pulser (Draft version 6-3,Sept. 2005) (13) P. Medina AGATA FADC Conceptual Design (14) I. Kojouharov, J.Gerl AGATA IDDS Conceptual Design

22 AGATA_Grounding ADC_Guru References for single ADC and single PCB AD6645_b_.pdf J29uTumOs2OuewUsaUe2taSNCWNTNFNLXm! ?navId=H0,C1,C1155,C1001,C1150,P9250,D

23 About Henry W. Ott: References Henry W. Ott: Noise Reduction Techniques in Electronic Systems,"2nd Edition, publisher: John Wiley & Sons, 1988, ISBN#: Henry Ott Consultants: Electromagnetic Compatibility Consulting &Training ignal.pdf

Charge Sensitive Preamplifiers (CSP) for the MINIBALL Array of Detectors

Charge Sensitive Preamplifiers (CSP) for the MINIBALL Array of Detectors - Core & Segments CSPs for 6-fold and 12-fold segmented and encapsulated detectors; - Principle of operation, schematics, PCBs;