# Presentation: 407883

## Proton DriverProject, Technology,                   & Collaboration

- G. W. Foster
- September 10, 2004

## 8 GeV Superconducting Linac

- New idea incorporating concepts from both the Spallation Neutron Source (SNS) and TESLA.
- Copy SNS & RIA Linac designs up to 1.3 GeV
- Use  “TESLA”  Cryomodules  from  1.3 - 8 GeV
- Advanced RF Distribution System
- H- Injection at 8 GeV in Main Injector
-   “Super-Beams” in Fermilab Main Injector

## 8 GeV Superconducting LinacWith X-Ray FEL, 8 GeV Neutrino & Spallation Sources, LC and Neutrino Factory

- 8 GeV Superconducting LinacWith X-Ray FEL, 8 GeV Neutrino & Spallation Sources, LC and Neutrino Factory

**Anti-**
**Proton**

## 8 GeV SC Linac Proton Driver

- A Bridge Program to the Linear Collider
- Near Term Physics Program (neutrinos+)
- Multiple HEP Destinations & Off-Ramps
- A seed project for Industrial Participation
*50 cryomodules, 12 RF stations, ~1.5% of LC*

## Linac Technical Strategy

- TESLA compatible frequency chosen
- Prototypes & vendors exist for 7/8 of linac
- Complete overlap with LC test facility goals
- Staging Stand-Alone Linac Beam Power
- Cut Klystron count from 42  12
- Preserve 2 MW beam power in MI
- Adopt “Pulsed RIA” SCRF front end

## Proton Driver Linac Parts

- MAIN “TESLA” LINAC  (1-8 GeV)
- ~  Exact copy of TESLA,   1.5% of LC
- Beta<1 “Squeezed TESLA” Linac
- “SNS” SCRF linac at   f = 1300 MHz
- “Pulsed RIA” Front End Linac
- spoke SCRF cavities at 325 MHz
- H- Source & RF Quad
- ~  Copy of JPARC 325 MHz front end

## 0.5 MW with TESLA Frequencies & SCRF F.E.

## 8 GeV Superconducting LinacTECHNICAL SUBSYSTEM DESIGNS EXIST AND WORK

- SNS Cavites (JLAB)

**FNAL/TTF**
**Modulators**

**“****TTF Style” Cryomodules**

**Civil**
**Const.**
**Based on **
**FMI**

**TESLA  RF**
**Distribution **
*** w/ phase shifters**

## Slide 9

## JHF 325 MHz RFQ and Klystrons  for TESLA-Compatible* Front End

- JHF  325 MHz
- 3 MW Klystron

- JHF 325 MHz RF Quad

- JHF 325 MHz RFQ and Klystrons  for TESLA-Compatible* Front End

- * TESLA frequency  =  1300  MHz
- = 4*325 MHz

**LANL  (APT)**

**ANL  (RIA)**

## RF Fan-out for 8 GeV Linac

## Advanced RF Distribution

- Advanced RF Distribution

- DIRECTIONAL
-  COUPLER
- (POWER SPLIT)

- MAGIC TEE
- AND CAVITY RF
- POWER COUPLER

- CIRCULATOR
- AND LOAD

- COAXIAL
- FERRITE STUB
- TUNER AND
- WAVEGUIDE
- TRANSITION

**RF FROM**
**KLYSTRON**

-  E

- /

- YET!

## RF Fanout at Each Cavity

## ELECTRONICALLY ADJUSTABLEE-H TUNER

- FERRITE LOADED SHORTED STUBS
- CHANGE ELECTRICAL LENGTH DEPENDING ON DC MAGNETIC BIAS.

***TWO COILS***  PROVIDE INDEPENDENT
***PHASE AND AMPLITUDE *** CONTROL OF CAVITIES

- Attractive Price Quote from AFT
- (<<  Klystron)

## Ferrite Phase Shifter High-Power Test Stand

- 805 MHz Klystron
- 12 MW x 100usec
*(need: 0.5 MW x 1 msec)*
- _First goal: _
-     See if existing YIG tuner functions at 500kW. ***(yes!)***
- _Ultimate Goal:_
- 0.2 dB loss for
- 360 deg. phase shift
- in 100~500usec.

- Door-knob
- Transition

- YIG Ferrite
- Phase Shifter

- Dry Load

- Ferrite
- Bias Supply

- Hybrid
- Tee

- 12 MW
- Klystron

## THE NEXT STEP

- There is a 100% overlap in the plans for the next step of the  SCRF Proton Driver and the SCRF Linear Collider:
_***Set up 1 GeV of TESLA linac***_
-  At Fermilab
-  With as many components from new vendors as possible

## THE NEXT NEXT  STEP

_***Demonstrate a 325 MHz ***_
_***TESLA-Compatibile SCRF linac***_
_***For Protons and Ions***_
-  At Fermilab
-  With as many components from new vendors and collaborators as possible

## TESLA-Compatible beta<1 linac concept

- Cost-Effective TESLA design at 1300 MHz for e- and relativistic protons
- Modified RIA SCRF design at 325MHz for ~3 MeV < E < ~200 MeV
*Single Klystron Drives entire linac up to 200 MeV*
*Beta < 1 SCRF components spread across international collaboration*
*Become “standard threads” for future designs*

## Collaborate to Develop  Standard SCRF Components

- Standardization is difficult (and often unadvisable) when a technology is developing rapidly
- SCRF is now mature, and within a factor of ~1.5 of ultimate gradients
- The TESLA-XFEL project guarantees a large base of 1300 MHz SCRF.
-  *Collaborate to Develop standard designs at TESLA-compatible frequencies, for many new projects.*

## M-East 

**M-East **
**And M-P**
**Beamlines**

**Proton Driver**
**TESLA LC**

## FNAL Meson Area SMTF Layout Example

## Project Information

- 125 Page Design Study
- Cost Estimate Spread Sheet  w/ BoE
- _http://tdserver1.fnal.gov/project/8GeVlinac_