HEBT, Ring, and RTBT Beam Position Monitors Final Design Review

1. HEBT, Ring, and RTBT Beam Position MonitorsFinal Design Review System Overview Peter Cameron July 23, 2002

2. Outline • Agenda • BPM System Status December 2000 • BPM System Status July 2002 • AP Requirements • Design Philosophy • HEBT, Ring, and RTBT Layouts • Responsibilities • Schedule BNL Diagnostics Review

3. Agenda 9:15 Peter Cameron System Overview 9:30 Peter Cameron PUE Design 10:00 Coffee 10:15 Marty Kesselman AFE and Processing 11:00 Craig Dawson Digitizer and PCI Interface 11:30 Peter Cameron Beam-Based Alignment 12:00 lunch at Berkner BNL Diagnostics Review

4. System Status as of December 2000 This is the status BEFORE the December ORNL Diagnostics Review, as reported to the advisory committee at that time: • PDR Complete • Detailed Design underway • FDR Complete for 21cm Ring and HEBT PUEs • First Articles of Ring and Transfer Line PUEs in fabrication • Feedthrus and standoffs ordered BNL Diagnostics Review

5. System Status as of July 2002 • All machining is complete, all materials for PUEs are in house • Ring and HEBT 21cm PUEs have been brazed and delivered to Vacuum Group • Electromagnetic measurements (TDR, S11, transfer function, mapping) of PUEs are in progress • AFE is modified (baseband, gain switching) Bergoz linac AFE, dual AFE is under consideration for Ring/RTBT 402.5MHz • Digitizer somewhat common w/ BCM, more so withLANL BPM (but 64MS/s?) • Absorbing details of PCI interface from LANL • Timing module progressing in collaboration with ORNL BNL Diagnostics Review

6. AP Requirements All Systems BNL Diagnostics Review

7. AP Requirements for BPM System • Beam Intensity • HEBT - 5e10 to 2e11 per minipulse • Ring and RTBT - 5e10 to 2e14 • Range - all locations +/- pipe radius • Accuracy - +/- 1% of radius, quad magnetic center to console • Resolution • single 5e10 minibunch +/- 1% of radius • averaged +/- 0.5% of radius • Data Structure • HEBT - within 600ns minipulse • Ring - turn by turn • Rate to console - 1Hz? BNL Diagnostics Review

8. AP Requirements for BPM System BNL Diagnostics Review

9. Design Philosophy • Extension of LANL approach • Stripline Pickups 25 cm long • Shorted in HEBT and RTBT - mechanically simple and accurate • Open in the Ring – keeps capacitive and electron clearing options open • Add features to LANL electronics • Gain switching • Baseband for Ring and RTBT • 400MHz Ring electronics - incoherent tune,… • Complete systems a few locations • Bergoz “dual AFE” - save PC, PCI interface, digitizer,… BNL Diagnostics Review

10. Design Philosophy 2 • Maximize commonality w/ LANL • Keep analog linear, digitize early, many processing options • Mean square processing to get good average over bunch • Log ratio processing opens the door to calibration via beam-based alignment • Calibration of electronics only, no pulse to PUE (unlike LANL) • Beam-based alignment • Accurately locate beam in quads relative to BPM electricalcenter • In combination with log ratio processing, calibrate entire system • With analysis (AP guys will need to weigh in on this one) may be possible to modulate quad families rather than switch out individual quads • This would also open door to BBA of sextupoles BNL Diagnostics Review

11. System Configuration DFE PCI DAQ Event Link PUE AFE TIMING MODULE DAC’s & PGA’s RTDL 2.5 MHz Reference 40 MHz/68MHz LO CLK GAIN CONTROL 352.5MHz LO PCI BUSS CONTROL SYSTEM LabVIEW RACK MOUNT PC BNL Diagnostics Review

12. HEBT Instrumentation BNL Diagnostics Review

13. Ring Instrumentation BNL Diagnostics Review

14. RTBT Instrumentation BNL Diagnostics Review

15. Responsibilities HEBT, Ring, and RTBT PUEs – BNL HEBT BPM electronics and signal processing– LANL HEBT TOF electronics and signal processing– LANL Ring 402.5 MHz electronics - LANL? Balance of Ring and RTBT electronics and signal processing - BNL BNL Diagnostics Review

16. BPM System Schedule BNL Diagnostics Review