# Presentation: 878405

## 1.5-GeV Superconducting Proton Linac

- as the Injector to the 1-MW Average Power AGS

**SCL mini-Workshop -- ORNL  June 25-26, 2001**

**Alessandro G. Ruggiero**

**Notes:**
Cover Page

## References

- Alessandro G. Ruggiero, “Design Considerations on a Proton Superconducting Linac”, BNL 62312 Informal Report, Aug. 1995.
- D.Raparia and A.G. Ruggiero, “A Super-Conducting Linac Injector to the BNL-AGS”, BNL C-A/AP/39 Internal Report, July 2000. Also presented to the XX Intern. Linac Conf., Monterey, Calif., Aug. 2000.
- A.G. Ruggiero, “A Super-Conducting Linac as a new Injector to the BNL-AGS”, BNL C-A/AP/40 Internal Report, February 2001.
- M.J. Brennan, et al., “Upgrading the AGS to 1 MW Proton Beam Power”, PAC 2001, Chicago, Illinois., June 2001.
- Alessandro G. Ruggiero, “SCL-Template”, A Design Tool written for EXCEL with VisualBasic.

- Alessandro G. Ruggiero

- Jun - 26 - 01

## AGS 1-MW Power Upgrade

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Layout of the 1.5-GeV Linac

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Front End

**Negative Ion Source**
- 	Current (H)			37.5 mA
- 	Platform			30-50 kV
- 	Rep Rate 			2.5 Hz
- 	Pulse Length   		1 ms
- 	Duty Cycle			0.25 %
- 	Emittance, norm. rms		0.3 π mm mrad
**RFQ**
- 	Frequency			201.25 MHz
- 	Output Energy		750 keV
- 	Capture Efficiency		80%
- 	Output Current		30 mA
**Chopper**
- 	Frequency 			2.057 MHz	(h = 6 AGS rf frequency)
- 	Chopping Ratio		60 %
**Buncher**
- 	        Frequency			201.25 MHz

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Low-Energy Section

- Upgrade can be at RT as done for Fermilab
- Or it can be Superconducting
- In both cases the length is about the same (~75 m)
- The average Accelerating Gradient ~ 3.8 MeV/m
- Cost also about the same (~ 40 M$)

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Medium - & High - Energy Sections

- Both are Superconducting
- Operate at 1610 MHz   ( =  18.62 cm)
- Each have the same geometry ad size of a cavity cell adjusted in length to an intermediate value 0
-                            Lcell  =  0 / 2

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Configuration of a SC Linac Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## General Parameters of SC Sections

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Power Distribution

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Cost (‘00 $) and other Parameters

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Dimensions

- Alessandro G. Ruggiero

- Jun - 26 - 01

## RF Parameters

- Alessandro G. Ruggiero

- Jun - 26 - 01

## RF Power Breakdown

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Cost

- Alessandro G. Ruggiero

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## Aperture to Beam Size Ratio

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Quadrupole Gradient

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## rms Bunch Length & Spread

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Axial Accelerating Field

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Transit Time Factor

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Dissipitated & Cryogenic Power

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Longitudinal Tune / Cryostat

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Envelope Amplitude

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01

## Alpha during Mismatch

- Low-Energy Section

- Alessandro G. Ruggiero

- Jun - 26 - 01