# Presentation: 222271

## Proton Driver Status Report

**Proton Driver Status Report**

- G. W. Foster
- Fermilab UEC                Nov 13, 2004

## 8 GeV Superconducting Linac

- New idea incorporating concepts from both the Spallation Neutron Source (SNS) and TESLA.
- Copy SNS Linac design up to 1.3 GeV
- Use  “TESLA”  Cryomodules  from  1.3 - 8 GeV
- H- Injection at 8 GeV in Main Injector
-  ==> “Super-Beams” in Fermilab Main Injector:
-  2 MW Beam power at BOTH 8 GeV and 120 GeV
-  Small emittances ==> Small losses in Main Injector
-  Minimum (1.5 sec) cycle time
-  MI Beam Power Independent of Beam Energy
- 			*	**==****>**** (flexible neutrino program)*

## 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*

## Recent Developments

**1****st**** Round of Proton Driver Design Studies Completed  ~2003**
**PD Recommendation by FNAL Long-Range Planning Committee**
**New Design Iteration Started**
**Goal: CD-0 Documentation by End of ’04**
**Both Synchrotron and SCRF Linac (emphasized)**
**ITRP Cold Technology Selection**
**FNAL Director’s Statement favoring SCRF Linac Option**
**APS Neutrino Study Boosts Case for Proton Driver**
**Physics Workshop for Proton Driver Successful & Well Attended**
**DoE Request for Near Term CD-0 Candidates**
**SMTF Collaboration EoI:  PD – ILC Synergy;  DoE Briefing**
***FNAL’s New Director will find PD ready for a “GO” decision***

## Proton Driver Charge (machine)

- Goal: CD-0 Documentation by End of ’04
- Both Synchrotron and SCRF Linac (emphasized)
- Common Performance Specs and Cost Basis
*(synchrotron “cost advantage” ~ disappears with apples-to-apples comparison)*
- External Review of Accelerator Physics
- Investigation of Outside Collaboration

## PD Work in Progress ...

- Weekly meetings in specific technical areas (four + cost)
- Visits from experts & workshops
- Prototypes of key components
- Develop Collaborations

## Linac Technical Strategy

- TESLA compatible frequency chosen
- Prototypes & vendors exist for 7/8 of linac
- Complete overlap with LC test facility
- 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

## Cost Driver: Klystrons per GeV

## 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.

## COLLABORATION

- Will be key to the success of
-  the SCRF Proton Driver
-  the ILC test facility
- ... and can speed up both if they are the same project.

## Slide 13

## 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)**

## End-to-End Beam Physicsof TESLA-Compatible Linac(P. Ostroumov, ANL)

## 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**

## Advanced RF Distribution(Coaxial Phase Shifter Option) 

- Advanced RF Distribution(Coaxial Phase Shifter Option)

- 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!

## 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 US-built components as possible

## ILC – PD Synergy Examples

- The ILC is becoming interested in:
-  Proton Driver’s Fast Phase Shifters as a way to reduce electrical costs
- 		    *(... see RF talks at SLAC ILC Workshop)*
- Proton Driver’s Long-pulse (3 msec) modulators as an approach to cost savings *(... drops Klystron Count)*
* **Bidirectional technology flow!*

## Proton Driver Strategic Plan

- The CD-0 Documentation for the Proton Driver will be complete in early 2005
- The current allocation of resources (for either ILC or PD) is insufficient for a reasonable start to SMTF.
- The next director must establish the priority for Proton Driver & SMTF