10/3/2003Andreas Jansson - Tevatron IPM review1 Tevatron IPM Proposed design

10/3/2003Andreas Jansson - Tevatron IPM review2 Overview Space requirements, location Detector design DAQ system Timing and software Commissioning, calibration and maintenance

10/3/2003Andreas Jansson - Tevatron IPM review3 Space requirements Two IPMs can be fitted in about 3.25 m Additional space may be required for calibration device (e.g. OTR screen).

10/3/2003Andreas Jansson - Tevatron IPM review4 Vacuum system Incorporate a controllable leak (N 2 ) to increase gas pressure, pumps to localize the ‘pressure bump’ and sector valves for maintenance access. ipm ion pump sector valve variable leak valve

10/3/2003Andreas Jansson - Tevatron IPM review5 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.

10/3/2003Andreas Jansson - Tevatron IPM review6 Location E0 has sufficient free space and is close to flying wires, scrapers, new schottkies etc

10/3/2003Andreas Jansson - Tevatron IPM review7 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).

10/3/2003Andreas Jansson - Tevatron IPM review8 Internal detector design calibration source shield mesh

10/3/2003Andreas Jansson - Tevatron IPM review9 Anode board and FE cabling ¼ mm strip spacing. Flex circuit to provide matched transmission line to vacuum interface. 50 pin feed-thrus. Shielded twisted pair cable on the outside.

10/3/2003Andreas Jansson - Tevatron IPM review10 Block diagram/data flow chart serializer 16 serial links (optical fiber) ~1.6 Gbits/s/link ~23 Gbit/s total Proton mkr Anode stirp signals (~128) 16 Proton revolution marker KwameVince, Mark et al PCI bus DMA xfer Burst mode ~1 Gbit/s Pbar revolution marker QIE (8 QIEs) optical driver Fast (wide) memory FPGA Data Commands: Start/stop DAQ Readout data QIE reset/reset Fanout Injection marker Timing generator Injection event (UCD+RFT?) in tunnelin upstairs PC GPIB (?) controller To power supplies PCI BUS? Header gen. 15 MHz Pbar mkr Injection mkr 15 MHz clock QIE reset

10/3/2003Andreas Jansson - Tevatron IPM review ns (21 buckets) p/pbar separation RF 2/7 1/7 Timing ( ) injection collision

10/3/2003Andreas Jansson - Tevatron IPM review12 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)

10/3/2003Andreas Jansson - Tevatron IPM review13 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.

10/3/2003Andreas Jansson - Tevatron IPM review14 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.

10/3/2003Andreas Jansson - Tevatron IPM review15 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.

10/3/2003Andreas Jansson - Tevatron IPM review16 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.

10/3/2003Andreas Jansson - Tevatron IPM review17 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, …)

10/3/2003Andreas Jansson - Tevatron IPM review18 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 vaccum can) to test RF properties suppression of parasitic signals longitudinal impedance.