1. Ionization Profile Monitor Front End (IFE) System Presenter: Kwame Bowie PPD/EED E-mail: bowie@fnal.govbowie@fnal.gov Phone: (630)840-6499

2. IPM System Diagram In Tunnel Upstairs Horiz. MCP Vert. MCP IPM FE Crate IPM FE Crate 128 channels IPM Buffer Cards IPM Timing Card DAQ PC 1 CAT5 cable 16 optical fibers IPM Buffer Cards IPM Timing Card DAQ PC 1 CAT5 cable 16 optical fibers Detector System Front End System Timing System Readout System Timing System Readout System Detector System Front End System

3. Front End System Requirements Capable of per-bunch resolution in both time and integrated charge Capable of instrumenting 256 microchannel plate (MCP) channels simultaneously Propagates ALL data upstream for sparsification/triggering in the IPM Buffer Cards All components in tunnel are rad-tolerant

4. IPM Front End System Components Two (2) separate IPM planes (horizontal and vertical) may be treated as separate subsystems Each IPM plane is instrumented by a single IPM Front End crate Each IPM crate contains: One (1) custom IPM Backplane for power distribution One (1) IPM Fanout card for clock distribution Sixteen (16) IPM Front End (IFE) boards digitizing MCP charge

5. IPM Front End System Diagram 16 serial links (optical fiber) ~1.6 Gbits/s/link ~23 Gbit/s total PBar Mrkr Anode stirp signals (~128) 16 Proton revolution marker Pbar revolution marker QIE (8 QIEs) Clock (15.2MHz) Control Proton Mrkr Fanout card 15.2 MHz 2RF/7 Encoded Control Backplane IFE Board power connectors

6. IPM Front End Backplane Design Custom Backplane required due to high power consumption of rad-tolerant ECL components Custom backplane has four (4) high-current connectors which provide power to the Front End Boards as separate quadrants. Power is provided by a custom 3-phase rectifier circuit (J. Zagel) that also is rad- tolerant.

7. IPM Backplane Block Diagram 6V @10A 8V @4A 6V @8.5A 8V @4A 6V @8.5A 8V @4A 6V @8.5A 8V @4A Quadrant A: 5 Slots Slot0: Fanout Slots1-4: IFEs Quadrant B: 4 Slots Slots5-8: IFEs Quadrant C: 4 Slots Slots9-12: IFEs Quadrant D: 4 Slots Slots13-16: IFEs Backplane

8. IPM Fanout Card Design IPM Fanout card receives a 2RF/7 clock and beam-synchronous timing flags from the IPM Timing Card (T. Fitzpatrick) IPM Fanout card is charged with providing low skew copies of this clock to all 16 IFEs in the crate to ensure simultaneous digitization on all cards

9. IPM Front End (IFE) Functionality Each IFE board digitizes 8 channels of MCP signal using 8 QIEs for the integration Each IFE board multiplexes these 8 channels of QIE data along with beam-synchronous timing information into a single fiber with a data payload of roughly 1.2Gbps Only two operational modes for the IFE boards: normal mode and calibration mode Boards ALWAYS send ALL data upstream to IPM Buffer card

10. IFE Board Data Flow Diagram QIE Rad-tolerant Antifuse FPGA 9bits@2RF/7 GOL 32bits@40Mhz Optical Transmitter MCP Analog Inputs 1.6Gbps CML 1.6Gbps optical

11. IPM Front End System Design Tradeoffs and Decisions Cost vs. radiation tolerance Power consumption vs. radiation tolerance Board/crate size vs. channels per board

12. IPM Front End (IFE) Board Specifications The IFE board integrated charge resolution is < 1fC The IFE board sampling (integration) period is ~15MHz Board size: 6U x 160mm Components Cost: $350/ board excluding QIEs, GOL, regulators Power Consumption: 12Watts/board

13. Calibration Decided against on-board charge injection mechanism for three (3) reasons: Possible noise concerns Possible charge sharing issues Board space concerns Advantages of off-board calibration: Calibration uses entire system and full data path, so it may be used as a system level functionality test Can be compared to results from LeCroy ADCs to verify accuracy Disadvantages of off-board calibration: Calibration requires lots of hardware Calibration very slow

14. Calibration Setup (Lab6 setup) Laser Control PC IPM Timing Card IPM Front End Board Laser Delay and Gate Generators Dye and Filter Wheels Pulse enable (NIM) Encoded Injection Trigger (PECL) NIM to TTL Trigger (TTL) Pulse laser (NIM) PMT Light analog current pulse Photo Diode LeCroy ADC analog current pulse QIE output ADC output