FEE design, What is available and what is next? Mircea Ciobanu 11 th CBM Collaboration Meeting February 26-29, 2007, GSI FEE1 PADI

Outline  A short description of what hardware we have in this moment, usable for future R&D works.  Summary for the next discussions.

FEE 1, a new lot of 20 pcb's are in production The FEE1 card was designed for the early stage R&D of the MMRPCs and is using standard hardware interfaces with commercial digitizers (TDC's, QDC's). It's based on three amplifier stages made with commercial low noise broad bandwidth MMICs, a PIN diode attenuator for the gain control and a fast ECL leading edge discriminator. The FEE1 card was designed for the early stage R&D of the MMRPCs and is using standard hardware interfaces with commercial digitizers (TDC's, QDC's). It's based on three amplifier stages made with commercial low noise broad bandwidth MMICs, a PIN diode attenuator for the gain control and a fast ECL leading edge discriminator. This card is used by many groups developing RPC as a FEE during the R&D on detector design: Germany (GSI-Darmstadt, PI-Heidelberg, FZD-Rossendorf), Korea (Seoul), Romania (NIPNE-Bucharest, in two research groups), Rusia (Moskau) and Spain (Santiago de Compostela). The final parameters of this 4 channel card are: maximum gain 400, bandwidth 1 GHz, noise referred to input ~20  VRMS, time resolution  tE =7 ps 5mV input signal), crosstalk between channels below -70 dB, power consumption 1.85 W/channel, dimensions 125 mm x 100 mm. The final parameters of this 4 channel card are: maximum gain 400, bandwidth 1 GHz, noise referred to input ~20  VRMS, time resolution  tE =7 ps 5mV input signal), crosstalk between channels below -70 dB, power consumption 1.85 W/channel, dimensions 125 mm x 100 mm.

FEE5  The FEE5 is a highly integrated 16 channels card which holds the basic features of FEE1 but has lower power consumption per channel and is connected directly with the custom designed digitizer TACQUILA 3. This board contains a fast test generator which can be remotely enabled or disabled, and receives from TACQUILA the threshold voltage and the latch enable/disable signals The final parameters which we reached for this card are: maximum gain of 220, bandwidth of 1.5 GHz, noise referred to input <25  VRMS,  =15ps 5mV input signal), crosstalk between channels less then -43 dB, power consumption of 0.51 W/channel, dimensions of 155 mm x 95 mm. The final parameters which we reached for this card are: maximum gain of 220, bandwidth of 1.5 GHz, noise referred to input <25  VRMS,  tE =15ps 5mV input signal), crosstalk between channels less then -43 dB, power consumption of 0.51 W/channel, dimensions of 155 mm x 95 mm. 400 cards were successfully build and 4200 channels are within FOPI

FEE-NINO 3 pcs

GSI-DVEE has developed a new tool for TACQUILA High Resolution Double Hit Timing and Time Over Threshold Measurement Feasibility for the TACQUILA System K.Koch, E.Badura, 2007-IEEE Nuclear Science Symposium Conference Record, N15-23

This adapter allows Time over Threshold measurements The results of the time over threshold measurements are depicted in Fig. 5 and show an outstanding linearity of the pulse width (red line) and are in principle not limited to long pulses. The minimum pulse length is about 1ns. For comparison the data from the simultaneously obtained amplitude measurement with the QDC card of the TACQUILA system is shown (green line). In the case of the QDC, the range is restricted to 10 bit in the TACQUILA system. High Resolution Double Hit Timing and Time Over Threshold Measurement Feasibility for the TACQUILA System K.Koch, E.Badura, 2007 IEEE Nuclear Science Symposium Conference Record, N15-23

And also Double-Hit measurements The result of double-hit measurements generated with double pulses on one input channel. With a single pulse width of 2ns, the minimum distance between two pulses is obtained to be about 7ns to get separated timing information.The timing resolution between two hits on one channel is the same as of two separate channels (<10ps) without using the double-hit card. High Resolution Double Hit Timing and Time Over Threshold Measurement Feasibility for the TACQUILA System K.Koch, E.Badura, 2007 IEEE Nuclear Science Symposium Conference Record, N15-23

PADI Test pcb, 2pcs.

The PADI together with a SC Diamond (4 pixels) detector PADI test PCB LVDS-PECL Converter PCB Interface PCB +5V,GND,THRconnections Time Output's LAN-K5 cable ~2.1m ~2.1mConnection's with with SC Diamond Pixel Detector September , 2007 Dresden

Summary for the next discussions:  From 20 FEE1 which are in production now, - 4 pcs for Daniel Stach FZD – Rossendorf - 4 pcs for V.Ammosov and F.Guber ITEP – Moscow - 2 pcs for India

We acknowledge the support of the European Community- We acknowledge the support of the European Community- Research Infrastructure Activity under the FP6 "Structuring the European Research Area" programme (HadronPhysics, contract number RII3-CT ).