# Presentation: 719669

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

- System Overview
- Peter Cameron
- July 23, 2002

## 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

## 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

## 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

## 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

## AP Requirements All Systems

- BNL Diagnostics Review

## 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

## AP Requirements for BPM System

| location | size | Intensity | Range | Accuracy | Resolution | Comments |
| --- | --- | --- | --- | --- | --- | --- |
|  |  | [ppp] | +/- Radius | +/- 1% R | 0.5%/1%R | Av/TBT Res |
| HEBT | 12cm | 5e10 | 6cm | 0.6mm | 0.3mm av | 402.5MHz |
| HEBT | 21cm |  | 10.5cm | 1mm | 0.5mm av | 402.5MHz |
| Ring | 21cm | 5e10-2e14 | 10.5cm | 1mm | 0.5mm av | 5MHz + |
| Ring | 26cm |  | 13cm | 1.3mm | 0.7mm av |  |
| Ring | 30cm |  | 15cm | 1.5mm | 0.8mm av | 402.5MHz |
| RTBT | 21cm | 5e10-2e14 | 10.5cm | 1mm | 0.5mm av | 5MHz + ? |
| RTBT | 36cm |  | 18cm | 1.8mm | 0.9mm av | 5MHz + ? |
| TOF | 12cm | 5e10 | +/- 180 deg | +/- 2 deg | 0.1 deg | 2 locations |

- BNL Diagnostics Review

## 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

## 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

## System Configuration

- PUE

- AFE

- 40 MHz/68MHz LO

- GAIN

- 352.5MHz LO

- DAC’s & PGA’s

- DFE

- PCI DAQ

- TIMING MODULE

- CLK

- 2.5 MHz Reference

- Event Link

- RTDL

- RACK MOUNT PC

- PCI   BUSS

- CONTROL

- LabVIEW

- CONTROL
- SYSTEM

- BNL Diagnostics Review

## HEBT Instrumentation

| Type | BNL | LANL |
| --- | --- | --- |
| BPM PUE 12cm | 31 | 0 |
| BPM PUE 21cm | 4 | 0 |
| BPM Electronics | 0 | 35 |
| Phase - BPM TOF | 0 | 2 |
| BLM | 52 | 0 |
| FBLM | 3 | 0 |
| BCM | 5 | 0 |
| WS | 0 | 11 |
| Foil Video | 2 | 0 |
| Harp | 0 | 2 |

- BNL Diagnostics Review

## Ring Instrumentation

| Type | Qty | Comment |
| --- | --- | --- |
| BPM (2 shared with RF) | 44 | 28 ea 21cm, 8 ea 26cm, 8 ea 30cm |
| IPM | 2 | H + V |
| BLM | 75 | Ion chamber |
| FBLM | 12 | PMT |
| Beam Current | 2 | BCM, WCM(RF) |
| Coh tune | 1 | Kicker + PU |
| Incoh tune | 2? | BTF, QMM |
| WS (LANL) | 1 | H + V + 45 deg |
| Beam-in-Gap | 1 | Kicker + PMT |
| E detector | 5 |  |
| Octupole | 1 |  |

- BNL Diagnostics Review

## RTBT Instrumentation

| Type | BNL | LANL |
| --- | --- | --- |
| BPM 21cm | 15 | 0 |
| BPM 36cm | 2 | 0 |
| BLM | 40 | 0 |
| FBLM | 3 | 0 |
| BCM | 5 | 0 |
| WS | 0 | 5 |
| Harp | 0 | 2 |

- BNL Diagnostics Review

## 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

## BPM System Schedule

- BNL Diagnostics Review