# Presentation: 540318

## December 2000 ORNL Diagnostics Design Review: Recommendations and Responses

- Peter Cameron
- July 23, 2002

## Dec00 ORNL Diagnostics Review

- Committee members in attendance were: Jim Crisp, Tom Powers, Marc Ross, and Bob Webber
- Absent: Glenn Decker, Ron Johnson
- First get-together of committee.
**Charge to committee**
- Is the proposed collection of diagnostics adequate for commissioning and operation of this facility?
- Are the selected technologies appropriate?
- For each presented system, is the conceptual design reasonable?

- BNL Diagnostics Review

## December 2000 ORNL Review Agenda

**Thursday, December 14, 2000**
- 8:15     Tom Shea: 		Introduction
- 8:45     Larry Doolittle:		Front end
- 9:15     Bob Shafer: 		Linac
- 9:45     Alexei Fedotov: 	Ring and Transfer lines
- 10:15   Dave Lousteau: 	Target Systems
- 10:45   Larry Doolittle: 	Emittance monitor, Linux platform
- 1:00     John Power: 		RF BPM/Phase
- 	    Matt Stettler: 	`	PC platform
- 2:30     Marty Kesselman: 	Current Transformers
- 3:30     Peter Cameron: 	Wire Scanners
- 4:30     Bob Shafer: 		Diagnostics Plate
**Friday, December 15, 2000**
- 8:15     Peter Cameron: 	Baseband BPM
- 	    Marty Kesselman: 	Electronics
- 9:30     Dave Gassner: 		Loss monitors
- 10:30   Roger Connolly: 	Ionization Profile Monitor
- 11:15   Mike Plum: 		Harps

- BNL Diagnostics Review

## Dec00 ORNL Diagnostics Review Report 1

- http://it.sns.ornl.gov/diagnostics/DAC2000/ReviewReport
**General observations and suggestions:**
- Improve communications between AP and Diagnostics, communicate clearer definitions and specs to system engineers - 8
- Clarify requirements thru the Control System to the end user - 5
- Forget the complicated segmented grounding scheme - ?
- Large Ring beam current means large ‘noise’ signals at revolution frequency harmonics. Consider on system-by-system basis, avoid unshielded gaps. - 5
- Performance validation is essential, have close-to-final diagnostics and user interface available as early as possible - 9 (MEBT commissioning)
- NT node approach looks interesting - keep interlab and Controls communications a high priority. continue! - 8
- Interlab communication and cooperation essential - 8

- BNL Diagnostics Review

## Dec00 ORNL Diagnostics Review Report 2

**System-by-System Observations and Suggestions:**
- By far weakest and most difficult area of Diagnostics is transverse profile and emittance measurement. Minimum spec from AP and possible solutions are very highest priority
- Good progress with IPM development work at BNL, possible solutions in hand for problems of beam loss, RF pickup and space charge/non-linearity. Good possibility of useful working Ring IPM.
- Luminescence monitor prototype successful at 24GeV in AGS
- ‘Optical IPM’ proposal
- Laser wire prototypes successful at 750KeV and 200MeV at BNL, development continues with installation of SCL beambox upstream of Linac-to-Booster.
- Laser wire prototype successful at 2.5MeV at LBNL/MEBT
- MEBT Carbon wire system successful

- BNL Diagnostics Review

## Dec00 ORNL Diagnostics Review Report 3

- Wire scanners failure in SCL has major potential impact
- Laser wire development
- Consider possibilities of **direct** **halo measurement**. Instrument the ring collimator system to measure intercepted beam.
- Both BLMs and FBLMs will monitor the collimators
- Concern with “one size fits all” **beam current monitor** system. Single device to meet the requirements for noise immunity, high frequency response, and accurate charge measurement of a millisecond long beam pulse?
- Tests (bench and MEBT) indicate we can meet system specs, this review will present more detail.

- BNL Diagnostics Review

## Dec00 ORNL Diagnostics Review Report 4

- There appeared to be unanswered, even unasked, questions about **timing requirements**
- Timing system now in good shape, extension to BPM/BCM in progress
- Specification of **beam position monitor** parameters (range, accuracy, resolution) were seen as being inadequate or incomplete
- Fixed - see latest rev of AP requirements table
- Presentation on **Ring BPM** electronics and signal processing left the committee confused about both the objective and the means
- See presentation this review

- BNL Diagnostics Review

## Conclusions

- Time has shown committee was pretty much on target, both in BNL specific recommendations mentioned here and in most of the project-wide recommendations that were not mentioned here.
- Committee concerns with BNL portions of Diagnostics have been addressed, and explicit evidence of this either exists or will be demonstrated during this review.

- BNL Diagnostics Review