Project X: 8 GeV Transfer and Injection

Injection PaintingKick-off meeting

Dave Johnson

APC/HINS

June 27, 2008

Beams-doc 3129

June 20, 2008 2

Project X RequirementsProject X Requirements

• Baseline Linac running @ 5Hz and 9mA avg. current 1ms pulse length– delivers 5.6E13/pulse at 51 kW/pulse -> 2.8E14/sec for 360 kW

• For neutrino program: MI cycle of 1.4 sec -> 3 linac pulses ->1.7E14 for 154 kW at 8 GeV and 2.3MW at 120 GeV (4 linac pulses left over i.e. 200 kW @ 8 GeV• Upgrade paths

– increase linac pulse length 1ms -> 3 ms– linac average current 9 mA -> 27 mA – linac rep rate 5 Hz, 10Hz, 15 Hz ???– Example: 10Hz at 25 mA still 1ms -> 1.56E14/pulse yields 2 MW (1.56E15) at 8 GeV– Scenarios: Inject/Extract each linac cycle (1 pulse to Recycler , 9 pulses elsewhere?)

Req. No. Req. Unit1.0 General1.1 120 GeV Beam Power 2.3 MW1.2 8 GeV Beam Power 360 kW1.3 8 GeV Slow Spill Beam Power 200 kW1.4 8 GeV Slow Spill Duty Factor 55 %1.5 120 GeV Availability 75 %1.6 8 GeV Availability 80 %

1.7Upgradeable 8 GeV Beam Power for Civil, RF, & Cryo Systems

2 MW

Description

From Project X RD&D Plan presentation, May 28, 2008 – Dave McGinnis

->1.5E15 protons/sec

->2.8E14 protons/sec

June 20, 2008 3

Project X RD&D Program GoalsProject X RD&D Program Goals

• The goal of the Project X RD&D program is to provide support for a Critical Decision 1 (CD-1) in 2010, leading to a CD-2/3a in 2011. – Design and technical component development;

– Development of all project documentation mandated by DOE 413.3;

– Formation of a multi-institutional collaboration capable of executing both the R&D plan and the provisional construction project.

• The primary technical goal is completion of a Conceptual Design Report, followed by a fully developed baseline cost estimate and schedule, and supported by a technology development program.– Capability of delivering in at least 2 MW of beam power over the

range 60 – 120 GeV, simultaneous with at least 200 kW of beam power at 8 GeV.

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From Project X RD&D Plan presentation, May 28, 2008 – Dave McGinnis

June 20, 2008 4

Project X RD&D Plan for FY08Project X RD&D Plan for FY08

• The main goal for the Project X RD&D Plan for FY08 is – to get an initial cost estimate for Project X for CD0.– Begin on long-term R&D items

• To prepare an initial cost estimate for CD0, the design of Project X must be further developed.

• To organize the labor resources in FY08, each level 2 manager reviewed the FY08 goals formulated in the RD&D plan. See http://projectx.fnal.gov/RnDplan/index.html

From Project X RD&D Plan presentation, May 28, 2008 – Dave McGinnis

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• The basic scheme of Project X is:– An 8 GeV Linac operating at ILC-like parameters – H- stripping and proton accumulation in the Recycler – Beam distributed to the Main Injector for acceleration to 120 GeV – Beam distributed to an 8 GeV slow spill program

• The major components that comprise Project X are: (Task groups)– A front end linac operating at 325 MHz (max energy 600MeV). – An ILC-like linac operating at 1300MHz.

– An 8 GeV transfer line and H- Injection system. See next slide – The Recycler operating as a stripping ring and a proton accumulator.– The Main Injector acting as a rapid cycling accelerator.– A slow extraction system from the Recycler.– 120 GeV Neutrino beam line.– Civil Construction and Utilities– Controls– Cryogenics

Refine conceptual design where an initial cost estimate could be started this fall working toward a CD0 next spring

June 20, 2008 5

Project X FY08 Goals for 8 GeV InjectionProject X FY08 Goals for 8 GeV Injection

1. Create a viable Recycler injection straight section and transport line interface to the injection straight section and injection absorber. Integrate solutions with the new Recycler ring lattice.

2. Revise Proton Driver Injection absorber design for Project X beam parameters.

3. Initialize simulations for transverse phase space painting.

4. Evaluate the stripping efficiency, losses, impact on circulating beam, and technological feasibility of carbon foil stripping and laser stripping techniques for 98% to 99% stripping efficiency utilizing Project X beam parameters.

5. Begin Conceptual Design of transverse collimation absorbers

Note: that there is/will be some overlap between topics in items 3 and 4.

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From Project X RD&D Plan presentation, May 28, 2008 – Dave McGinnis

June 20, 2008 6

Intensities and Scenarios• Base line design

– Linac 9mA average current with 1 ms pulse length 5.6e13/pulse is 72 kJ/pulse -> implies ~90 turn injection

– Linac running this intensity at 5 Hz is 2.8E14/sec or 360 kW injected.– For MI injection Recycler will accumulate up to 3 linac cycles for 1.68E14 protons

then single turn transfer to MI– MI cycle 1.4 sec -> 7 linac cycles/MI cycle: 3 for MI and up to 4 for “others”– For 8 GeV program, inject and extract individual linac cycles ?– Assume linac emittance ~ 2.5 we want to paint the 3 cycles to 25 max– For individual injections/extractions paint to 8 or 25 ?

• Upgrade to 2 MW– Increase linac average current X3?– Increase pulse length X3?– Increase rep rate X2?– 1.6E15/sec injected – How is this to be utilized? Inject/extract? Accumulation? How many pulses?

• The question of whether Recycler “can handle this intensity” is to be addressed by the Recycler group.

• NOTE: – the ratio of m/i for SNS ~ 40 , JPARC ~ 36, Project X ~10 or less, depending– the ratio of Recycler acceptance to final emittance < x2 Vertical and <x3 Horizontal

June 20, 2008 7

Project Layout

Existing 8 GeV line enclosure

Existing 8 GeV line

New Proton Driver transport line

Existing Main InjectorMI-10

New Proton Driver /8GeV line Enclosure

INJECTION ABSORBER

TRANSVERSE COLLIMATION

MOMENTUM COLLIMATION

LINAC DUMP

LINAC

June 20, 2008 8

Option for Project X Transport Line

• The upstream end of the transport line remains unchanged. The new vertical bend section moves transport line further under MI-65 (needs to be verified)

collimation New section

injection

Defines beam size on foil, hence specifications for injection foil

June 20, 2008 9

Initial Recycler Lattice Modifications

Qx=25.445

Qy=24.134

x~70

y ~30~25m

No tuning !

Issue:• use phase trombone for tune control• add distributed quads for tune control

Next slide

Dispersion “free”

June 20, 2008 10

Injection region

• Layout used for Proton Driver injection into Main Injector

Start paint

End paint

DC orbit (Chicane)

Removal from foil

Next slide

June 20, 2008 11

Injection layout

• Layout used for Proton Driver injection into Main Injector

HBC1 HBC2 HBC3 HBC4

75 to 100 mm

8.941 m 0.606 m 1.068 m

Stripping foilH-

H0

H+ to inj. absorber

Thick foil H0->H+

Circulating protons

foilMagnet Length [m]

Strength [kG]

Theta [mr] H & V Aperture [in]

HBC1 0.7 +3.5669 +8.4211 6 x 2

HBC2 6.0 -0.4656 -9.4211 12 x 2 or 3?

HBC3 2.0 -5.5620 -37.5179 12 x 3 (?)

HBC4 1.0 +11.4206 +38.5179 12 x 3 (?)

June 20, 2008 12

Current scheme

• Current scheme is anti-correlated horizontal painting and vertical steering. • Suggested by KEK and implemented into STRUCT

MI CL 0 mm 100 mm

33(inj)

150mm

Chicane (DC Bump)

Start Paint150 mm

Removal

Offset

Painting

33(cir)

11(inj)11(cir)

Total

H- Injection Orbit

B0 = maximum kickN = Number turns to paintn = turn numberP = Painting displacementR = Removal displacementT = Total displacement

Foil support

Foil

2

0

21

N

n

N

n

T

P

T

RBB

2

4444

2)('

N

nN

N

nNy injcir

Maximum kick, B0 [kG] 10.98

Painting Displacement, P [mm] 10.45

Removal Displacement, R [mm] 39.54

Offset [mm] 33.05

June 20, 2008 13

Power Supply waveforms for 3 linac cycle injection

• Waveform for anti-correlated H paint/ V steer

Painting Waveforms

0

0.2

0.4

0.6

0.8

1

1.2

0 50 100 150 200 250 300 350

Injection Turns

Rel

ativ

e A

mpl

itude

Horizontal PaintingVertical PaintingHorizontal Removal

pulse 1 (1ms) pulse 2 (1ms) pulse 3 (1ms)

remove from foil (200 ms)

End 1st injection

End 2nd injection

End 3rd injection

Foil (injected beam)

Closed orbit movement

Move off foil

Start injection Stripping foil

Closed orbit

June 20, 2008 14

Exponential Painting Bumps for Anti-correlated painting

• Bumps proposed by Joanne Beebe-Wang (BNL) for 3ms anti-correlated h paint/v steer PD injection.

• X = A+Bexp(-t/)• Y’ = A+Bexp(t/)

We would like to compare the resultant phase space, number or parasitic hits, etc. between the exponential functions and the square root functions.

June 20, 2008 15

Goals/Questions

• We would like to investigate both correlated and anti-correlated painting

• Investigate foil orientation and impact on number of circulating hits• Investigate KEK and exponential functions• Do either functional forms create a distribution close-enough to a KV

distribution which minimizes • Compare results with STRUCT and ORBIT• Understand how each code treats interaction of circulating beam

with foil. • What kind of field descriptions are required?• Investigate impact of space charge on resultant phase space.• Minimize number of foil hits from circulating beam• Investigate power supply requirements for injection kickers bumps

June 20, 2008 16

TASK: Initialize simulations for transverse phase space painting

• Deliverables:– Specifications for phase space painting magnet requirements– Conceptual design of power supply for phase space painting magnets– Status report on phase space painting simulations

• David Johnson– Classification: Eng. Physicist– Percent Effort: 10% – Duration 5 months – Task: Provide requirements and parameters for phase space painting. Coordinate simulations and provide

initial parameters for magnet and power supply designs.• Sasha Drozhdin

– Classification: Scientist – Percent Effort: 50% – Duration 4 months – Task: Make necessary code changes and implement new Recycler Ring Project X injection optics into

STRUCT and initiate transverse painting simulations.• Leonid Vorobiev

– Classification: Scientist – Percent Effort: 50% – Duration 4 months – Task: Make necessary code changes and implement new Recycler Ring Project X injection optics into

ORBIT and initiate transverse painting simulations.• Steve Hays

– Classification: Engineer – Percent Effort: 15% – Duration 2 months – Task: Generate a conceptual design for power supply system capable of creating the flexible waveforms

required for transverse phase space painting.

June 20, 2008 17

Action Items• What do we need to do to get started?• Are the currently defined deliverables and tasks

appropriate? Any modifications?• What is required to implement various painting schemes

into ORBIT and STRUCT?• What kind of input phase space needs to be produced

(from TRACK)?• Can the MI PD lattice be utilized while RR lattice is being

developed?• Do we need to bring anyone else on board immediately?• Longevity of ORBIT support at FNAL?• Regular meetings ? Frequency?• Anything I forgot?