# Presentation: 492508

## Antiproton Acceptance

- Steve Werkema
- DOE Review
- February 24, 2004

## Scope

- Two Projects:
- AP2 Beamline and Debuncher Acceptance Improvements
- 	Project Leader: Keith Gollwitzer
- High Gradient Lithium Lens Upgrades
- 	Project Leader: Jim Morgan

## Motivation

- Increase the number of antiprotons collected from the target _by_:
-  Increasing the admittance of the AP2 beamline and the Debuncher to **35 ******** mm-mrad**
-  Increasing the gradient of the collection lens to **100 kG/cm**

**Note:** Yield curves in model reduced by 10% to approximately account for chromatic effects

## AP2 & Debuncher Acceptance

- Overview of plan
- Status

## AP2 & Debuncher Acceptance -- Plan

**Identify Limiting Apertures**
- Assemble Documentation and Drawings (FNAL Tech. Div.) 	(WBS 26.2.2.1)
- Optical Survey and Alignment 	(WBS 26.2.2.2)
- Chromatic correction of the AP2 beamline (LBNL)	(WBS 26.2.2.7)
- Improve AP2 and Debuncher Lattice models 	(WBS 26.2.2.8)
- Beam based determination of limiting apertures 	(WBS 26.2.2.9.2)
**Mitigate aperture restrictions**
- Redesign/modify/rebuild/relocate beamline elements 	(WBS 26.2.2.5)
**Implement Beam Based Alignment**
- Instrumentation upgrades 	(WBS 26.2.2.3)
- AP2 BPMs
- Debuncher BPMs
- Orbit control 	(WBS 26.2.2.6)
- Install additional dipole trims in AP2
- Motorized quad stands in the Debuncher
- Beam Based Alignment 	(WBS 26.2.2.4)
- Develop procedures
- Software development
- Beam studies 	(WBS 26.2.2.9)

## AP2 & Debuncher Acceptance – Beam Based Alignment

_**Beam**_** **_**Based**_** **_**Alignment**_
- Excite quad  Measure Response  Correct Orbit
- We will be able to accomplish this because:
- Most quads have shunts installed
- Upgraded BPMs in the Debuncher and AP2
- Greatly increased orbit correction capability in the Debuncher and AP2

## AP2 & Debuncher Acceptance –– Chromatic Correction

- New Task added since July 2003:
**Chromatic Correction of the AP2 Beamline**
- Work being done by LBNL
- Model chromatic effects
- Beam studies to test model
- Propose correction scheme (August 2004)

- AP2 line chromatic -functions

## AP2 & Debuncher Acceptance –– Status (1)

**Identification of limiting Apertures**
-  ***Documentation and Drawings***
- AP2 Physical Aperture table complete. Apertures have been incorporated into the AP2 lattice model.
- Debuncher Physical Aperture table was recently completed (still requires final error checking)
-  ***Optical Survey***
- Tunnel work is 90% complete (work includes network setup)
- Survey data are being compiled and analyzed
**Mitigate Aperture Restrictions**
-  ***Recent developments:***
- DRF3 move completed during the Fall 2003 shutdown
- Design work started for vertical band 4 cooling array upgrade
- Design work started for Debuncher extraction kicker beam pipe replacement

## AP2 & Debuncher Acceptance –– Status (2)

**Implement Beam Based Alignment**
***Instrumentation***
- AP2 BPMs
- Presently trying to understand and correct Deb. Extraction kicker noise	Est. Completion: SD 2004
- DAQ hardware & software upgrade –
- 		Est. completion: Jan. 2005
- Debuncher BPM upgrade
- All 6 sectors installed and operational
- Console software is functional and in routine use – some improvements are still being made.
***Orbit Control***
- Debuncher motorized quad stands
- 10 stands installed during the Fall 2003 shutdown
- 96 new bumps have been calculated and tested
- Install an additional 20 stands during the Summer 2004 shutdown

## AP2 & Debuncher Acceptance –– Bumps

- Angle bump at the extraction kicker using a combination of trim dipoles and motorized quad stands.

- New Debuncher BPM control system application ****

## AP2 & Debuncher Acceptance –– Status (3)

***AP2 and Debuncher Lattice modeling***
- Working OptiM models of the AP2 line and the Debuncher exist
- AP2 model has been updated with physical aperture information
- Debuncher and AP2 models will be updated with physical aperture and survey information as the data becomes available
- LBNL has developed a MAD model for the study of chromatic effects
***Beam Studies***
- 	Recently completed studies (Sept. 2003 – Feb. 2004):
- Reverse proton studies
- Observation of beam signal on all AP2 BPM cables
- Commissioned the new Debuncher BPM electronics
- Commissioned bumps with new motorized quads (nearly complete)
- Development of beam based determination of Debuncher apertures
- Stacking studies
- Measure AP2 + Debuncher admittance
- 	(development of measurement techniques)
- Development of AP2 BBA using Debuncher TBT
-   bumps in AP2

## AP2 & Debuncher Acceptance

**†**** **	AP2 + Debuncher admittances reported at the July 2003 review were:
- 	 Horizontal: 20 	mm-mrad, Vertical: 12  mm-mrad

******* **Debuncher admittances reported at the July 2003 review were:
- 	 Horizontal: 25 	mm-mrad, Vertical: 20  mm-mrad

|  | Measured AP2 + Debuncher | Measured Debuncher | Smallest Aperture | Goal |
| --- | --- | --- | --- | --- |
| Horizontal 
(mm-mrad) | 24 ± 3 † | 28 ± 3 
(12% increase since 7/03 ) | 36  | 35  |
| Vertical 
(mm-mrad) | 18 ± 2 † | 20 ± 2  | 30  | 35  |
| Momentum | ±2.15% | ±2.30% | -- | ±2.25% |

## AP2 & Debuncher Acceptance –– Limiting Apertures

**†**** **DRF3 was moved during the Fall 2003 shutdown and is no longer an aperture restriction.  Table gives pre-move admittances.

*** **The numbers in this column were calculated using -functions at ***p/p* = 0

| Device | Horizontal |  | Vertical |
| --- | --- | --- | --- |
|  |  | * |  |
| Band 4 H pickup | 36.8  | 36.3  | 48.7  |
| Band 4 V pickup | 40.5  | 39.0  | 29.9  |
| Band 4 H kicker | 36.0  | 35.5  | 48.7  |
| Band 4 V kicker | 41.2  | 41.1  | 30.1  |
| DRF3† | 70.2 
Now 250 | 17.0 
Now 250 | 200.4 
Now 253 |
| Deb Extr. kicker | 109.1  | 21.9  | 35.8  |

## High Gradient Li Lens

## High Gradient Li Lens – Goals & Plan

_**Goal**_**:** Operate a Lithium lens --
-  at a gradient of at least 1000 T/m (34% ****)
-  for at least 10 million pulses
_**Action**_** **_**Plan**_
- New solid Li Lens design (began 2000)	 (WBS 26.2.1.2)
- General Li Lens R&D	 (WBS 26.2.1.3)
- Autopsies of failed lenses
- FEA model of present design
- R&D of various Lens technologies
- Improve present Li Lens design	(WBS 26.2.1.1)
- Fabricate New Lenses	 (WBS 26.2.1.5)

**Notes:**
Various lens technologies:
Annular water passage
Water/Li seal testing
Hone/etching R&D
Li bellows casting
Transformer modifications

## High Gradient Lithium Lens – New Design

- _Features_:
- Diffusion bonded titanium body
- Improved cooling
- Li buffer volumes eliminated

- _Diffusion Bonding_:
- Better, more uniform cooling of lens body
- May allow use of new Ti alloy (Ti 10V-2Fe-3Al has a 15 – 40% better fatigue endurance limit)
- Simplified lens fabrication
- Elimination of weld joints on septum

## High Gradient Li Lens -- Status

**New Lens design (diffusion bonded lens)**
- Complete and test new lens design prototype #1
- Presently being pulsed on test stand at design gradient
- Over 1.5x106 pulses so far
- Intend to pulse to failure
- Construction on prototype #2 expected to begin in March 2004
-  **General Lens R&D**
- Lens autopsies complete
- Continue to refine and expand FEA model
- Ti 10-2-3 testing in process
**Modifications to existing lens design**
- 	Presently operating a lens constructed with improved quality control procedures (Lens 28)
- In the pipeline:
- Lens 29 (available in 2 weeks)
- Lens 30 (available in ~10 weeks)

## WBS Overview

## Milestones

## Major Shutdown Work

**Shutdown 2004**
- Install additional 20 motorized quad stands
- Replace D4Q4
- DRF2 Move
**Shutdown 2005**
- Wider Vertical Band 4 cooling arrays
- Upgraded Debuncher Injection Septum (*SD 2004? *)
- Motorized stands for Debuncher injection & extraction kickers
- Possible modifications to Debuncher extraction kicker (*SD 2004? *)
- Possible implementation of AP2 chromatic correction
**Shutdown 2006**
- New Debuncher extraction kicker (if not modified during SD 04/05)
- Implement of AP2 chromatic correction (if not implemented during  SD 2005)

## Conclusion – The Bottom Line

- Present*****p* yield:
- 1610-6*****p*/POT
- Expected*****p* yield:
- (1.1)(3310-6*****p*/POT)
- = 3610-6*****p*/POT
-  **52 ********10****10*********p*****/hr**
- Delivered to the Accumulator for stacking
- For:
- 81012 POT/pulse
- (slip stacking)
- 2.0 sec cycle time

**Note:** Yield curves in model reduced by 10% to approximately account for chromatic effects