Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Proton DriverGeneral Meeting
Kick-off Presentation
G. W. FosterPD General Weekly Meeting
Jan 12, 2005
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
OUTLINE• Purpose of Weekly General Meeting
• Elevator Speech on Proton Driver
• What we’ve been up to the last year– Technical progress since 2003
• Getting Plugged into Working Groups
• How to Educate Yourself Efficiently about the Proton Driver
• What’s Next
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Weekly General Meeting
• Inform FNAL Staff about what is going on
~ 40% Physics
~ 60% Technology
• Communication between working groups
http://ProtonDriver.FNAL.GOV
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Working Groups
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
8 GeV Superconducting Linac• “New” idea incorporating concepts from both the Spallation
Neutron Source, RIA, and TESLA.– Copy SNS & RIA Linac designs 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)
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
8 GeV Superconducting LinacWith X-Ray FEL, 8 GeV Neutrino & Spallation Sources, LC and Neutrino Factory
~ 700m Active Length8 GeV Linac
X-RAY FEL LAB8 GeVneutrino
MainInjector@2 MW
Anti-Proton
SY-120Fixed-Target
Neutrino“Super- Beams”
NUMI
Off- Axis
& Long-Pulse Spallation Source
Neutrino Target
Neutrinosto “Homestake”
Short Baseline Detector Array
Target and Muon Cooling Channel
Bunching Ring
RecirculatingLinac for Neutrino Factory
VLHC at Fermilab
Damping Ringsfor TESLA @ FNALWith 8 GeV e+ Preacc.
1% LC Systems Test
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
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
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Proton Driver Linac Parts1. MAIN “TESLA” LINAC (1-8 GeV)
~ Exact copy of TESLA, 1.5% of LC
2. Beta<1 “Squeezed TESLA” Linac– “SNS” SCRF linac at f = 1300 MHz
3. “Pulsed RIA” Front End Linac– spoke SCRF cavities at 325 MHz
4. H- Source & RF Quad~ Copy of JPARC 325 MHz front end
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
0.5 MW with TESLA Frequencies & SCRF F.E.
R F QR F Q
Modulator
H -
B=0.47 B=0.47 B=0.61 B=0.61 B=0.61 B=0.81 B=0.81 B=0.81 B=0.81 B=0.81 B=0.81 B=0.81
Modulator
"Pulsed RIA" SCRF Linac 325 MHz 0 - 120 MeV
B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1
Modulator Modulator
12 Klystrons (2 types) 11 Modulators 20 MW ea. 1 Warm Linac Load 54 Cryomodules~550 Superconducting Cavities
8 GeV 0.5 MW LINAC
8 Klystrons288 cavites in 36 Cryomodules
2 Klystrons96 cavites in 12 Cryomodules
B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1
Modulator Modulator
B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1
Modulator Modulator
B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1
Modulator Modulator
Modulator
48 cavites/ Klystron
36 cavites/ Klystron
TESLA Klystrons1300 MHz 10 MW
"Squeezed TESLA" Superconducting Linac1300 MHz 0.087 - 1.2 GeV
"TESLA" LINAC 1300 MHz Beta=1
S S RS S RS S RD S RD S RD S R
Multi-Cavity Fanout at 10-20kW/cavityPhase & Amplitude Adjust via Fast Ferrite Tuners
TESLA Klystrons1300 MHz 10 MW
325 MHz Klystrons1.5 MW
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
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
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Upgrade Strategy: Add Klystrons
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Cost Driver: Klystrons per GeV
96
20
8.13
5
1.5
1.1
0 20 40 60 80 100
Spallation Neutron Source
FNAL Linac Upgrade
X-Band (warm) NLC
8 GeV Linac (2 MW)
8 GeV Linac (0.5 MW)
TESLA
Klystrons Per GeV Beam Energy
Proton Driver Beams
INITIAL ULTIMATE TESLA
Beam Power 0.5 MW 2.0 MW 23 MW
Beam Current 8.3 mA 25 mA 9.5 mA
Beam Pulse 3 msec 1 msec 1 msec
Rep Rate 2.5 Hz 10 Hz 5-10 Hz
Klystrons 12 36 584
Cavities / Klystron 36:1 12 : 1 36 : 1
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
120 GeV Main Injector Cycle with 8 GeV Linac, e- and P
Main Injector: 120 GeV, 0.67 Hz Cycle, 2.0 MW Beam PowerLinac Protons: 8 GeV, 4.67 Hz Cycle, 0.93 MW Beam Power Linac Electrons: 8 GeV, 4.67 Hz Cycle, 0.93 MW Beam Power
8 GeV Linac Cycles 1.5E14 per Pulse at 10Hz
Main Injector Energy
H-Injection
8 GeVProtons
8 GeVElectrons
0
20
40
60
80
100
120
140
0 0.5 1 1.5 2 2.5 3
Time (sec)
MI Energy
H- Injection
8 GeV Protons
Electrons
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
120 GeV Main Injector Cycle with 8 GeV Synchrotron
SYNCHROTRON INJECTIONMain Injector: 120 GeV, 0.56 Hz Cycle, 1.67 MW Beam Power
Surplus Protons: 8 GeV, 11.7 Hz Avg Rate, 0.39 MW Beam Power 8 GeV Synchrotron Cycles 2.5E13 per Pulse at 15Hz
Main Injector Energy
6 InjectionCycles
21 Extra8 GeV
Proton Cycles
0
20
40
60
80
100
120
140
0 0.5 1 1.5 2 2.5 3
Time (sec)
MI Energy
Injection Cycles
8 GeV Proton Cycles
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Linac Allows Reduced MI Beam Energy without Compromising Beam Power
MI cycles to 40 GeV at 2Hz, Retains 2 MW MI beam power
Main Injector: 40 GeV, 2.0 Hz Cycle, 2.0 MW Beam PowerLinac Protons: 8 GeV, 4.0 Hz Cycle, 0.8 MW Beam Power Linac Electrons: 8 GeV, 4.0 Hz Cycle, 0.8 MW Beam Power
8 GeV Linac Cycles 1.5E14 per Pulse at 10Hz
Main Injector Energy
H-Injection
8 GeVProtons
8 GeVElectrons
0
20
40
60
80
100
120
140
0 0.5 1 1.5 2 2.5 3
Time (sec)
MI Energy
H- Injection
8 GeV Protons
Electrons
• # neutrino evts. ~ same vs. E
• Reduces tail at higher neutrino energies.
• Permits Flexible Neutrino Program
2MW @40 GeV
NOT SPECIFIED
FOR SYNCHROTRON
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Baseline Design
• Only bare H- Linac or Synchrotron
0.5 MW Stand-Alone Power (& 2 MW upgrade path)
• Main Injector Intensity Upgrades for 2MW
• Reference Experimental Program -TBD
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Main Injector Intensity Upgrade RF: Major upgrade. Need a second power amplifier for each
cavity (and 4 more cavities for synchrotoron option). Power supply: moderate upgrade (for synchrotron option) Magnet: OK. Shielding & Beam Dump: OK. Cooling capacity: OK for magnet, needs to be doubled for
RF. Gamma-t jump system: New. Large aperture quad: New. (In Progress for Run II / NUMI) Collimation system: New. (In Progress for Run II / NUMI?) Passive damper and active feedback: (New..?) Stop band correction: New. NuMI and other 120 GeV Beamlines: Under study.
http://www-bd.fnal.gov/pdriver/
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Some Developments• 1st Round of PD Design Studies Completed 2003
• PD Recommendation by FLRPC early 2004
• New Design Iteration Started
– Goal: CD-0 Documentation by “End of ’04”
– Both Synchrotron and SCRF Linac (emphasized)
• ITRP Decision Adds Momentum to SCRF
• US SCRF Collaboration enthusiasm for PD
• Workshop on H- Transport & Injection gives clean bill of
health to 8 GeV linac parameters
• Successful tests of prototype fast-Phase shifters
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
New Proton Driver Charge Letter Development and elucidation of an overall strategy for implementing a Proton
Driver that is in concert with the shorter term plan of the existing Proton Source and Main Injector improvements being developed under the leadership of Eric Prebys.
As with any such responsibility you may be asked from time to time to report on Proton Driver progress to various review committees, help with the lab’s long range financial planning for such a project, and help inform the Fermilab User Community about the exciting physics prospects of such a facility.
In organizing and undertaking this assignment I would like to collaborate closely with interested parties in all our divisions and sections. I would further ask you to involve institutions outside of Fermilab who might have potential interests in either collaboration on development, construction, and operations of the Proton Driver itself or in the scientific research programs enabled by the facility. I would suggest that a workshop or workshops exploring the accelerator physics and technologies, along with the scientific opportunities would be an important component in proceeding in this direction. The lab will be happy to support you in the arrangements of such workshop(s) It is my intention that once this information is available the Fermilab directorate will carry out a review that will compare the two prospective Proton Driver technologies with the goal of identifying the option that is best for Fermilab. This will allow the laboratory to proceed expeditiously with a complete Conceptual Design Report for the selected option, along with cost estimates, resource loaded schedules and other required CD-1 documentation, following the establishment of mission need via a formal CD-0 from the Department of Energy. Action to implement the vision for the future outlined by the Fermilab Long Range Planning Committee is important to securing a healthy and productive future for both Fermilab and for the U.S. The steps described here are an important component of identifying how to best structure Fermilab’s future program in areas that address many of the most important questions in science over the coming decade. Steve Holmes will serve as the Directorate point of contact on this activity, and both Steve and I look forward to working closely with you, and the participating divisions, sections, and outside institutions on this. Thank you. Cc
Div/section heads Associate Directors W. Chou S. Mishra E. Prebys J. Jackson
To: Bill Foster and Steve Geer From: Michael Witherell Subject: Next Steps on the Proton Driver I would like you to assemble and lead a team to achieve the goals recommended by the Fermilab Long Range Planning Committee relative to the Proton Driver, with an emphasis on the superconducting linac as suggested by that committee. For the purpose of this assignment I will define the Proton Driver project as a complete replacement of our current 400 MeV linac and 8 GeV Booster, accompanied by Main Injector upgrades, sufficient to enable the delivery of at least 0.5 MW of average beam power at 8 GeV, and 2.0 MW of beam power at 120 GeV. I am hopeful that the assignment described above can be completed by the end of 2004.
In particular I would like you to initiate and coordinate efforts in the following areas:
Preparation of documentation sufficient to establish mission need for the Proton Driver as defined by the Department of Energy CD-0 process.
Development and documentation of the physics case. I would like this to include both support for a forefront neutrino program at Fermilab in the decade of 2010 and beyond, and identification of other opportunities that could potentially be enabled with a Proton Driver facility.
Completion of comparably scoped cost estimates for the linac and synchrotron options based, to the extent practical, on a common basis of estimate and on common implementation strategies.
The cost estimates should specifically include modifications to the Main Injector required to meet the established 2 MW @ 120 GeV criterion.
The cost estimates should assume a complete replacement of the existing linac.
The implementation strategy should be based upon minimal disruption to the ongoing collider (Run II and BTev) and neutrino programs.
The goal is to understand the cost differential between the linac and synchrotron and what benefits are realized for the (presumably) higher cost.
Documentation and external review of accelerator physics and technology issues for both options, specifically including anticipated beam loss and beam handling issues for both machines. The goal is to put the accelerator physics basis of the superconducting linac at the same level as the (more traditional) synchrotron-based solution.
Examination and documentation of the siting issues associated with both machines, for both the baseline mission of providing Neutrino Super-Beams and for future development of facilities on the Fermilab site.
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Proton Driver Charge (machine)
• Goal: CD-0 Documentation by End of ’04
– Target is now March ’05 Director’s Review
• Both Synchrotron and SCRF Linac (emphasized)
– Common Performance Specs and Cost Basis
• External Review of Accelerator Physics
• Investigation of Outside Collaboration
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
PD Work in Progress …
• Weekly meetings in specific technical
areas (four) (six)
– See http://ProtonDriver.FNAL.GOV
• Visits from experts, workshops
• Prototypes of key components
• Developing Collaborations
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Proton Driver Linac - Technology Flow
R
F
Q
“PULSED RIA”
SCRF Spoke
Cavity Linac
“SNS / RIA”Beta < 1 Elliptical
Cavity Linac
“TESLA”
Elliptical Cavity SCRF Linac
Beta = 1 1300 MHz
JHF
(KEK)
RIA (ANL)
APT (LANL)
SNS (JLAB)
RIA (MSU)
FNAL
ANL / SNS
New FNAL Proton Source Linear Collider Test Facility
TESLACOLLABORATION
BNL / SNS
FNAL Proton PlanUpgrades
NUMI Beamline &
Infrastructure
H
_
325 MHzRFQ andKlystron
SCRFSpoke
Cavities
LinacAccel.
Physics
SNSProductionExperience
< 1Cavity
Design
FastFerrite
Shifters
PulsedModu-lators
Cavitie
s
Cryo
ge
nics
Klystro
ns
RF
D
istribu
tion
Beam Transportand CollimationDesign
MainInjector@2 MW 8 GeV beams:
P, n, , , e…Technological& HEP Applications
Neutrino Super-beams
Other Labs & Universities
PROTON DRIVER
8 GeV1.3 GeV
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
JHF 325 MHz3 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
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
LANL (APT) ANL (RIA)
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
End-to-End Beam Physicsof TESLA-Compatible Linac
(P. Ostroumov, ANL)
0 100 200 300 400 500 600 700 8000.8
1.0
1.2
1.4
1.6
1.8
2.0
RM
S E
mitt
ance
Gro
wth
Fac
tor
Distance (m)
Horizontal Vertical Longitudinal
0 100 200 300 400 500 600 700 800-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
Y
B
eam
siz
e (c
m)
X
Distance (m)
x_rms y_rms Xmax Ymax
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
8 GeV Superconducting LinacTECHNICAL SUBSYSTEM DESIGNS EXIST AND WORK
SNS Cavites (JLAB) FNAL/TTFModulators
“TTF Style” Cryomodules
CivilCons
t.Based on
FMI
TESLA RFDistribution * w/ phase shifters
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Advanced RF Distribution(Coaxial Phase Shifter Option)
DIRECTIONAL
COUPLER
(POWER SPLIT)
MAGIC TEE
AND CAVITY RF
POWER COUPLER
CIRCULATOR
AND LOADCOAXIAL
FERRITE STUB
TUNER AND
WAVEGUIDE
TRANSITION
RF FROM
KLYSTRON
E/
YET!
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Fast-Ferrite Phase Shifter R&DYIG Ferrite Phase Shifter Prototypes
(1300 MHz Waveguide Style)
Iouri Terechkine, Timergali Khabiboulline, Ivan Gonin (TD)
Water-CooledWaveguideStub
BiasCoils
BiasYoke
Simulation
F=1266 MHz. Parallel Bias.
F=1292 MHz. Parallel Bias.
F=1266 MHz. Anti-parallel Bias.
1300 MHz Waveguide YIG Ferrite Phase Shifter
Low Power Measurements
• High Power measurements coming soon
-160
-140
-120
-100
-80
-60
-40
-20
0
20
40
60
80
100
1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200
Bias, Gs
Ph
as
e,
de
g.
G550, 1300 MHz.
-1.0
-0.9
-0.8
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200
Bias, Gs
|S11
|, d
B
G550, 1300 MHz.
About 200 degree phase shift for bias range 1350-3000 G.
Absorption <0.1dBwith phase shift ~160 degrees
Ferrite Tuner (coax)• Coax design
is preferredat 325MHz
• In-house design tested to 660kW at 1300 MHz
• To be tested with Argonne / APS352MHz Klystron
• Fast coil and flux return shouldrespond in ~50us
Dave Wildman (AD), Vladimir Kashikhin, Emanuela Barzi (TD)
Development Contract Placed with AFT for full-spec 1300 MHz I/Q tuner assembly
Al Moretti (AD)AFT 352 MHz Single tuner built for CERN SPL
Complete I/Q Tuner Including:
• Two Phase Shifters
• Hybrid
• Control Electronics
• FNAL-ProvidedPower Supply
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
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
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Proton Driver - 0.5 MW with TESLA Frequencies & SCRF F.E.
R F QR F Q
Modulator
H -
B=0.47 B=0.47 B=0.61 B=0.61 B=0.61 B=0.81 B=0.81 B=0.81 B=0.81 B=0.81 B=0.81 B=0.81
Modulator
"Pulsed RIA" SCRF Linac 325 MHz 0 - 120 MeV
B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1
Modulator Modulator
12 Klystrons (2 types) 11 Modulators 20 MW ea. 1 Warm Linac Load 54 Cryomodules~550 Superconducting Cavities
8 GeV 0.5 MW LINAC
8 Klystrons288 cavites in 36 Cryomodules
2 Klystrons96 cavites in 12 Cryomodules
B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1
Modulator Modulator
B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1
Modulator Modulator
B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1B e t a = 1
Modulator Modulator
Modulator
48 cavites/ Klystron
36 cavites/ Klystron
TESLA Klystrons1300 MHz 10 MW
"Squeezed TESLA" Superconducting Linac1300 MHz 0.087 - 1.2 GeV
"TESLA" LINAC 1300 MHz Beta=1
S S RS S RS S RD S RD S RD S R
Multi-Cavity Fanout at 10-20kW/cavityPhase & Amplitude Adjust via Fast Ferrite Tuners
TESLA Klystrons1300 MHz 10 MW
325 MHz Klystrons1.5 MW
325 MHztest area
1300 MHztest area
I LC
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
FNAL Meson Area SMTF Layout Example
325 MHzTESLA-CompatibleBeta <1 Linac Test
Four CryomoduleSystem Test
A0 Photoinjector& Beam Tests
Connection to Meson AreaCryo Plant
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
THE NEXT NEXT STEPDemonstrate a 325 MHz
TESLA-Compatibile SCRF linac
For Protons and Ions– At Fermilab
– With as many components from new collaborators and vendors as possible
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
325 MHzFront-EndLinac
325 MHz Klystron – Toshiba E3740A (JPARC)
115kV Pulse Transformer
ModulatorCapacitor / Switch / Bouncer
ChargingSupply
RFQ
MEBT
SCRF SpokeResonatorCryomodules
RFDistributionWaveguide
FerriteTuners
Single KlystronFeeds SCRF Linacto E > 100 MeV
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
M
325 MHz RF System
Pulse Transformer& Oil Tank
IGBT Switch & Bouncer
CAP
BANK
10 kV110 kVCharging
Supply
300kW
MODULATOR: FNAL/TTF Reconfigurable for 1,2 or 3 msec beam pulse
SingleJPARC Klystron325MHz
3 MW
WR2300 Distribution Waveguide
TO
SH
IBA
E37
40A
I
Q
M
E
I
Q
M
B
I
Q
M
T
I
Q
M
R F Q
I
Q
M
Cables toTunnel
Fast Ferrite Isolated I/Q Modulators
RF Couplers
S
I
Q
M
S
I
Q
M
R
I
Q
M
S
I
Q
M
S
I
Q
M
R
I
Q
M
400kW 20 kW
D
I
Q
M
S
I
Q
M
R
I
Q
M
I
Q
MD
I
Q
M
S
I
Q
M
R
I
Q
M
120 kW
10kV
H-
Medium EnergyBeam TransportCopper Cavities
Radio FrequencyQuadrupole
Cryomodule #1 Single-SpokeResonators
Cryomodule #2 Double-Spoke
Resonators
20 kW
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
Single Module Including:
1. Circulator / Isolator
2. Hybrid(s) & loads
3. Two Fast-Ferrite Tuners
Complete resonance control for One Cavity
Low power versions may fit on Single Circuit Board
Fast Ferrite I/Q Modulator Concept
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
How to Educate Yourself Efficiently about the Proton Driver
• Read Hassan Padamsee’s Book on SCRF Technology– His FNAL lectures should be online soon
• Read the 2003 PD Linac Design Report• Read the 1999 SNS SCRF Design Report • Read the TESLA TDR• Browse the links on
http://ProtonDriver.FNAL.GOV including the big pile of relevant papers linked from there
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
2003 Design Study• 125 Page Design
Study
• Cost Estimate Spread Sheet w/ BoE
http://tdserver1.fnal.gov/project/8GeVlinac
FNAL-TM-2169 (Part II)
An 8 GeV Superconducting
Injector Linac Design Study
1 INTRODUCTION................................................................................................................... 5 2 MOTIVATION FOR THE 8 GeV LINAC........................................................................... 7
2.1 Multi-Mission Linac ....................................................................................................... 7 2.2 Main Injector Operations with the 8 GeV Linac ............................................................ 8 2.3 Relevance to Future Accelerator Projects .................................................................... 10 2.4 Superconducting RF Technology................................................................................. 11
3 DESIGN OVERVIEW.......................................................................................................... 14 3.1 Front-End Warm Linac (0-87 MeV) Overview............................................................ 14 3.2 Superconducting RF (SCRF) Linac (87 MeV – 8 GeV) Overview ............................ 15 3.3 RF Power Systems - Overview..................................................................................... 16 3.4 Civil Construction Overview........................................................................................ 16 3.5 Site Selection ................................................................................................................ 19 3.6 One-Tunnel vs. Two-Tunnel Machine Layout. ............................................................ 20 3.7 Underground Klystron Gallery..................................................................................... 21 3.8 Tunnel Depth and Shielding ......................................................................................... 21
4 CHOICE OF PRIMARY PARAMETERS ........................................................................ 22 4.1 Beam Energy ................................................................................................................ 22 4.2 Beam Charge per Pulse ................................................................................................ 22 4.3 Beam Current and Pulse Width .................................................................................... 22 4.4 Linac Pulse Repetition Rate (Average Beam Power)................................................... 23 4.5 Different Particle Types in the 8 GeV Linac ................................................................ 24
5 ACCELERATOR PHYSICS ............................................................................................... 25 5.1 Baseline Lattice and Cavity Layout ............................................................................. 25 5.2 Transverse Focusing ..................................................................................................... 26 5.3 Longitudinal Focusing and Frequency Jumps. ............................................................. 27 5.4 Linac Aperture .............................................................................................................. 27 5.5 H- Stripping from Magnetic Fields and Energy Upgrades ........................................... 29 5.6 Energy Stability and Cavity Resonance Control .......................................................... 30 5.7 Multiple Cavities per Klystron ..................................................................................... 30 5.8 Debuncher Cavity......................................................................................................... 31
6 RUNNING ELECTRONS AND PROTONS IN THE SAME LINAC ............................ 32
Jan 12, 2005 G.W.Foster - Proton Driver General Meeting
What’s Next(a personal view of where the Proton Driver could & should be going)
• Technical hurdles have been cleared: (H- stripping & fast phase shifters)
• Teams have been assembled in (most) key areas
• SMTF (Meson Area SCRF) Collabortion is functioning
• Ready for a positive decision