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Tevatron IPM

Tevatron IPM. Proposed design. Overview. Space requirements, location Detector design DAQ system Timing and software Commissioning, calibration and maintenance. Space requirements. Two IPMs can be fitted in about 3.25 m

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Tevatron IPM

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  1. Tevatron IPM Proposed design Andreas Jansson - Tevatron IPM review

  2. Overview • Space requirements, location • Detector design • DAQ system • Timing and software • Commissioning, calibration and maintenance Andreas Jansson - Tevatron IPM review

  3. Space requirements • Two IPMs can be fitted in about 3.25 m • Additional space may be required for calibration device (e.g. OTR screen). stand/support Andreas Jansson - Tevatron IPM review

  4. Vacuum system ion pump ion pump variable leak • Incorporate a controllable leak (N2) to increase gas pressure, pumps to localize the ‘pressure bump’ and sector valves for maintenance access. valve ipm ipm sector valve sector valve Andreas Jansson - Tevatron IPM review

  5. Magnet stands • Motorized stands are needed to align detector with the beam (due to large aspect ratio of anode strips). • These can also be used to center the detector on the beam orbit. • Only the vacuum can with detector needs to be moved, the magnets can be fixed. Andreas Jansson - Tevatron IPM review

  6. Location flying wires E0 center • E0 has sufficient free space and is close to flying wires, scrapers, new schottkies etc • Proton/pbar time separation 110-150 ns Andreas Jansson - Tevatron IPM review

  7. Radiation measurements • Radiation levels at 4-5 feet is less than 0.5 rads/hour • With the current 60% duty cycle, that gives an annual dose of 2500 rads (8 years for QIE). Andreas Jansson - Tevatron IPM review

  8. Internal detector design Andreas Jansson - Tevatron IPM review

  9. ¼ mm strip spacing. Flex circuit to provide matched transmission line to vacuum interface. 50 pin D-type feedthrus. Shielded twisted pair cable on the outside. Anode board and FE cabling Andreas Jansson - Tevatron IPM review

  10. in tunnel in upstairs PC Pbar revolution marker Proton revolution marker Timing generator Fanout Injection marker Injection event 15 MHz clock (UCD+RFT?) QIE reset PCI BUS? To power supplies Injection mkr QIE reset/reset Proton mkr GPIB (?) controller Pbar mkr 15 MHz Kwame Vince, Mark et al QIE Data Header gen. FPGA • Commands: • Start/stop DAQ • Readout data 16 Anode stirp signals (~128) Fast (wide) memory (8 QIEs) serializer PCI bus DMA xfer Burst mode ~1 Gbit/s optical driver 16 serial links (optical fiber) ~1.6 Gbits/s/link ~23 Gbit/s total QIE Block diagram/data flow chart Andreas Jansson - Tevatron IPM review

  11. Timing 396 ns (21 buckets) p/pbar separation collision injection RF 2/7 ( ) 1/7 Andreas Jansson - Tevatron IPM review

  12. Header timing info • Proton marker bit (marks sample with first proton bunch). • Pbar marker bit (marks sample with first pbar bunch). • Injection marker bit (marks first turn at injection). • QIE mode and cap ID# (4 bits) Andreas Jansson - Tevatron IPM review

  13. Software • Card driver to be provided by CD • Low level code to transfer and sort data. • High level code to analyze (fit) data. • Modify existing IPM LabView program for top level part (at least initially). Need to write new low-level code. Andreas Jansson - Tevatron IPM review

  14. Commissioning • The system timing needs to be adjusted with beam, to compensate for cable delays etc. • Involves adjusting phase of sample clock, plus delays of proton, pbar, and injection marker (to correct for location in ring). • Will be done empirically. Andreas Jansson - Tevatron IPM review

  15. Calibration • A number of cross checks can be performed • Monitor average signal to detect saturation. • Vary B-field to verify electron focusing. • Use internal electron source and/or move detector wrt beam to verify MCP gain uniformity. • Detect parasitic coupling by turning off MCP, clearing voltage etc. Andreas Jansson - Tevatron IPM review

  16. Absolute calibration • In the end, the only way to do an absolute calibration is to compare to another instrument. • Install a simple profile detector next to IPM. • OTR screen would be suitable, and there is interest from the Instrumentation group to build one for the Tevatron. Andreas Jansson - Tevatron IPM review

  17. Maintenance • Monitor MCP gain uniformity and change plates periodically • Monitor QIE cards (current draw) and replace if needed. • Single dead channels is not a disaster, but a dead card may be a problem. • Regular infrastructure (water, magnets, …) Andreas Jansson - Tevatron IPM review

  18. Summary • We believe we have a sound basic design • Need to build and test DAQ system chain (QIE card, buffer card, timing and fanout) • Need to build and test detector unit (including vacuum can) to test RF properties • suppression of parasitic signals • longitudinal impedance. Andreas Jansson - Tevatron IPM review

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