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1 M. Popovic If You Build It, They Will Com 8GeV CW Linac: A Staged Approach Milorad Popovic, Fermilab June 26, 2012

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If You Build It, They Will Come. 8GeV CW Linac: A Staged Approach Milorad Popovic, Fermilab June 26, 2012. M. Popovic. 1. CW Proton Linac on the Fermilab site. The linac is segmented in three parts, based on output energy: 1GeV, 3GeV and 8GeV. - PowerPoint PPT Presentation

TRANSCRIPT

Page 1: M. Popovic

1M. Popovic

If You Build It, They Will Come

8GeV CW Linac:

A Staged ApproachMilorad Popovic, Fermilab

June 26, 2012

Page 2: M. Popovic

•The linac is segmented in three parts, based on output energy: 1GeV, 3GeV and 8GeV. •It is located near the existing Fermilab Proton Source; each section can be used as soon as it is commissioned. •The suggested sitting and segmentation allow for the construction to start immediately. •Additional benefits come from the fact that the present linac (the oldest machine in the Fermilab complex)

gets replaced. As a result, the Proton Source would preserve its functionally for many years in the future.

• A storage ring in the Fermilab Booster tunnel is used to accumulate 1-GeV beam from the ProjectX H- Linac. • The ring is made out of permanent magnets, and its primary purpose is to accumulate beam for the Booster. •The ability to chop bunch-by-bunch in the linac creates many opportunities to package beam for different users in the proposed storage ring. For example, the stored beam can be used for: •Pulsed Spallation Source, •for a muon-to-electron conversion experiment based on a 100-Hz FFAG ring (Prism/Prime), •for a pulsed beam for Short Baseline Neutrino Experiments.

These specially packaged beams can be used either directly or after acceleration in the Booster.

CW Proton Linac on the Fermilab site

Concept creates opportunities for substantial benefits and costs reductions for mu2e/g-2.

Page 3: M. Popovic

This Talk is Based on two Notes

3M. Popovic

A Concept: 8GeV CW Linac, Staged Approach Milorad Popovic (with lot of help from Chuck)

• http://beamdocs.fnal.gov/AD-public/DocDB/ShowDocument?docid=4108

The Linac is as defined on the official ProjectX Web Page

(RFQ162MHz, HWR162MHz ,…)

A 1-GeV Accumulator Ring in the Booster TunnelM. Popovic, B. C. Brown, D. Harding, T. Nicol, F. Ostiguy and J. Volk, Fermilab

and C. Ankenbrandt, Muons, Inc.•http://beamdocs.fnal.gov/AD-public/DocDB/ShowDocument?docid=4139

Page 4: M. Popovic

ProjectX, TeV in-field Siting

4M. Popovic

New 400MeV Linac

New Tunnel&Gallery~100m

New 0.4-1GeV Linac

Existing 400MeV Linac Tunnel & Gallery

3G

eV

CW

Linac

3-8 GeV pulse

Linac

Experim

enta

l .A

rea

Tra

nsfe

r

Line

Page 5: M. Popovic

8 GeV Linac, New Siting

5M. Popovic

Transfer line toMI20,~500mLinac, 3-8GeV,~500m

Linac, 1-3GeV,~200m Linac, 1GeV,~250m

Page 6: M. Popovic

Existing 400MeV linac is ~150 meters long + ~30 m Preacc Building

6M. Popovic

3 GeV ProjectX, Energy & Length

ProjectX 3 GeV Linac

Page 7: M. Popovic

Add 90 m to the existing Linac tunnel at the Low Energy End

7M. Popovic

New tunnel ~90m1 -3 GeV Linac

Inj. in MI30, 3-8 GeV Linac

Page 8: M. Popovic

Stage 1, 1 GeV Linac & Storage Ring

8M. Popovic

Page 9: M. Popovic

1 GeV Linac

9M. Popovic

New 400MeV Linac

New Tunnel&Gallery~100m

New 0.4-1GeV Linac

Existing 400MeV Linac Tunnel & Gallery

Page 10: M. Popovic

Booster Operation: from 0.4 to 1 GeV

10M. Popovic

• At present, 400MeV H- beam from the linac is transported along a ~40 m transfer line to the Booster tunnel and ~5E12 protons are injected. •Peak current is ~30mA and injection lasts for 12 Booster turns or 26 us (total injection time 12*2.2us). •Present transfer line has two 12-degrees vertical bending magnets and two 10-degrees horizontal bending magnets.

• The bends should be replaced with weaker magnets to keep H- stripping at minimum (~5E-5) for beam at 1GeV.•The bends have to have field ~0.35T and length of 2.8 meter.

The rest of the transfer line can be used as is, with the exception of the injection system. •The middle magnet of the injection system has to be run at 88% higher current or should be replaced with a 50% longer magnet. •An other possibility is to use correctors for additional displacement and painting during injection.

Page 11: M. Popovic

~ 1GeV Staging

11M. Popovic

Preacc Building

• Build new ~400 MeV linac in new+Preacc enclosure•Build a transfer line along present linac and inject in Booster•Decommission the existing linac and extend new linac up to ~1 GeV in existing tunnels and galleries•Add a Storage Ring in the Booster tunnel

90 m Addition

Page 12: M. Popovic

Direct 1GeV Injection in the Booster

12M. Popovic

•The beam from new linac has a peak current of 5mA. An injection time longer then 180us will be required to inject more beam than we do today.To avoid a relative momentum swing exceeding 1E-4, the injection time should not exceed 240us. For a linac current of 5mA, this corresponds to 7.5E+12 protons injected in the Booster. This also insures that space charge tune shift will be half of the value that we have right now at Booster injection. This gives 150kW of beam power from Booster at 8GeV and from Main Injector, 0.5MW at 120GeV without slip staking.

But• 5mA for 250us may be problem for CW linac RF•May be we would like to have more than 7E+12 protons from Booster•???

Page 13: M. Popovic

1-GeV Accumulator Ring in the Booster Tunnel

13M. Popovic

•The ring is made out of permanent magnets, and its primary purpose is to accumulate beam for the Booster. •The beam intended for the Booster is accumulated into stationary buckets at ~47 MHz (for 1GeV beam) during ~1 msec. (This is much simpler than trying to inject “on the fly” into the ramping Booster.) The beam is then transferred bucket to bucket in a one-turn extraction into the Booster. •For the rest of the Booster cycle time of 66.7 msec, the permanent magnet ring can be used to accumulate and store beam for other purposes. The ability to chop bunch-by-bunch in the linac creates many opportunities to package beam for different users in the proposed storage ring. Examples:• the stored beam can be used for a Pulsed Spallation Source, • for a mu2e conversion experiment based on a 100-Hz FFAG ring

(Prism/Prime), • for a pulsed beam for Short Baseline Neutrino Experiments.

These specially packaged beams can be used either directly or after acceleration in the Booster.

Page 14: M. Popovic

Storage Ring in Booster

14M. Popovic

Magnet length Dipole(T) Grad(T/m) Sagitta (m)

Width /Gap(m)

D 2.516 0.159 -0.326 0.013 0.155/0.065F 2.517 0.159 0.301 0.015 0.155/0.065

Parameter X YTotal length(m) 24*19.9862=479.6Tune 24*0.214=5.136 24*0.226=5.437BetaMax(m) 32.14 19.8DispersionMax(m) 4.66 0GamaT 4.419

Page 15: M. Popovic

J. Volk Preliminary Design of Magnet

15M. Popovic

Page 16: M. Popovic

Section Freq, MHz Energy, MeV Cav/mag/CM ~Length of CM

HWR 162.5 2.1 – 10.8 8/8/1 5.26 m

SSR1 325 10.8 – 35.1 16/8/2 4.76 m

SSR2 325 35.1 – 165.4 36/20/4 7.77 m

LB 650 650 165.4 – 556.2 42/14/7 7.1 m

HB 650 650 556.2 – 3064.5 152/19/19 11.21 m

Section Freq, MHz Energy, MeV Cav/mag/CM Length of CM

ILC / Pulsed 1300 3000 - 8000 224/28/28 11.7 m

Energy

3 GeV Transport to RF SplitterTransport to DumpTransport to 8 GeV

Transport to an Experimental Target

8 GeV Transport to DumpTransport to MI/RR

Project X RF Segmentation

Page 17: M. Popovic

Two Stages to ~1 GeV

17M. Popovic

Stage 1. Build 400 MeV linac and 400 MeV Storage Ring

Stage 2. Develop and Build HB650 modules up to 1.18 GeV Double number of permanent magnets to store 1.18GeV Beam

Stage 1. Build 520 MeV linac and 520 MeV Storage Ring

Stage 2. Develop and Build HB650 modules up to 1.5 GeV Double number of permanent magnets to store 1.5GeV

Beam

Or even better, use all LB650 modules

Page 18: M. Popovic

Why do Staging & why near Wilson Hall ?

18M. Popovic

• Staging gives you:•Beam to Booster as soon as 400 MeV is build•More beam from Booster even at 400 MeV•Reduce vulnerability from old linac

• Location gives you :• No Need to move PXIE• immediate use of new structure with only

~90 m of new tunnel•Saving of about 150 m of tunnel and galleries•Saving of new accumulation ring tunnel •Saving in PIP cost•Saving in combining Cryo costs for ProjectX, Mu2e and g-2• Visibility of project (name can be changed)????

What about experiments, mu2e, g-2, …

Page 19: M. Popovic

Implications for mu2e and g-2

Page 20: M. Popovic

Nufact09-IIT20 07/24/2009

• Take 2 cycles at time from Booster (thru Recycler)– stack in Accumulator– (~33ms)

• Form into 4 bunches– ~33ms – 1 bunch at time transfers to

Debuncher• Stretch Debuncher to slow extraction

over 66ms– 2.4×1012 / bunch

• (δν < 0.02)• Use Recycler to accumulate Booster

cycles – 12/20 to NuMI (1.33s)– 8/20 to mu2e

• (16/20)duty cycle

Timing Diagram/Beam Delivery to mu2e

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Beam for mu2e!

21M. Popovic

Page 22: M. Popovic

mu2e with Project X, Stage 1

22M. Popovic

New tunnel ~90m1 -3 GeV Linac

Inj. in MI30, 3-8 GeV Linac

Linac bunch is < 1ns long, (5)x4E7 p/bunchBunch separation at 1.8us or shorterNo need for beam preparation, no slow spillNo need for P-bar complexNo need for RR

Mu2e w/o ProjectX

Page 23: M. Popovic

23

g-2 Beam Delivery Concept w/o Project X

Booster/Linac

Extraction from RR

Injection to RR

NEW TRANSFER LINE

A3 lineA2 line

Main Injector

F0P1 line

MI-52

MI-30

p

Recycler

_p

MI-10

Pbar

AP0

P2 line

Accelerator Overview

INJ8GeV

Page 24: M. Popovic

84 RF buckets

7 Equally spacedNotches

BoosterStorage Ring

Main Injector/Recycler

Circulating Beam

Seven ~100ns trains150 ns spaced inStorage Ring/Booster/RR

g-2 with Project X, Stage 1

•Beam Bunched in Accumulation Ring• Intensity and train length adjustable (~100ns)•Train separation 150ns, or longer •Kickers rise time not demanding, ~100ns•Kickers fault time more then 1us•No need for additional RF Systems, single 53MHz cavity will keep beam structure.

Page 25: M. Popovic

3 GeV Experimental Area & Storage Ring, 8 GeV Linac – Project-X Stages 2 and 3

25M. Popovic

Transfer line toMI20,~500mLinac, 3-8GeV,~500m

Linac, 1-3GeV,~200m Linac, 1GeV,~250m

Page 26: M. Popovic

Backup Slides

26M. Popovic

Backup

Page 27: M. Popovic

Linac Tunnel, 14x13 feet

27M. Popovic

Cryomodules

Dynamic Load (W @2K)

Energy (MeV) @ exit

End position (approx, m)

Cryomodule Length (approx, m)

Interconnect Length (N-> N+1, approx, m)

HWR 3.6 10.3 15.88 6.75 0.53SSR1 1 14.2 23.7 21.15 4.55 0.62

2 13.0 36.3 26.42 4.46 0.57SSR2 1 54.5 57.1 34.70 7.49 0.89

2 64.9 90.7 43.30 7.49 0.893 65.3 128.8 51.90 7.49 0.894 65.3 165.9 60.50 7.49 1.96

LE650 1 96.2 205.2 69.37 6.20 3.092 116.7 261.5 79.37 6.20 3.293 134.0 326.6 89.57 6.20 3.294 143.7 391.5 99.77 6.20 3.295 143.7 451.6 109.97 6.20 3.296 143.7 505.7 120.17 6.20 3.297 143.7 556.8 130.37 6.20 4.36

HE650 1 191.9 652.7 145.77 10.01 4.352 191.9 763.0 161.17 10.01 4.353 191.9 883.7 176.57 10.01 4.354 120.4 972.9 191.97 10.01 17.205 191.9 1097.5 222.77 10.01 4.356 191.9 1231.1 238.17 10.01 4.357 191.9 1366.4 253.57 10.01 4.358 191.9 1502.9 268.97 10.01 4.359 191.9 1640.0 284.37 10.01 4.35

10 191.9 1777.6 299.77 10.01 4.3511 191.9 1915.3 315.17 10.01 4.3512 191.9 2053.2 330.57 10.01 4.3513 191.9 2191.1 345.97 10.01 4.3514 191.9 2329.0 361.37 10.01 4.3515 191.9 2466.8 376.77 10.01 4.3516 191.9 2604.6 392.17 10.53 4.3517 191.9 2742.3 407.57 10.01 4.3518 191.9 2879.9 422.97 10.01 4.3519 191.9 3017.4 438.37 10.01 -438.37

1 GeV 1898.73 GeV 4777.6

Page 28: M. Popovic

Linac Tunnel & Beam

28M. Popovic

At present Linac has administrative limit of 3e14p/sec Accident condition is define as 1800, 400MeV pulses, each pulse is 57usec long and

Linac peak current is 45mA 4.6E-3 C

(It take ~3usec to turn off beam in present linac) This is 1.8mA current for 1 sec from 1GeV Linac

(power equivalent) New Linac is SC, so very sensitive to beam loss 400MeV and higher energy beam is very stif Place that may have problem is exit from linac and

Shute

but I think that we can turn off linac beam in less then msec!

Page 29: M. Popovic

Booster Tunnel & Beam

29M. Popovic

Today Booster loss: 11% of injected beam is lost, ~3% is notched beam 500W lost around ring~1% of beam power

Storage ring will have collimation system will get chopped beam will have bunched beam will have higher energy will have smaller emittance beam

If we assume 1% power loss, 500 m ring will allow 500W loss so we can store 50kW or more beam at 1 GeV.

Page 30: M. Popovic

Injection & Accumulation in Storage Ring

30M. Popovic

Circulating Beam

Injected Beam H-

Stripping

Orb1 Orb2

Orb3Orb4

Foil

MainMag

MainMag

Page 31: M. Popovic

Single Turn Extraction from Storage Ring

31M. Popovic

Page 32: M. Popovic

Linac bunch length

32M. Popovic

Page 33: M. Popovic

Booster Tunnel & Beam

33M. Popovic

Page 34: M. Popovic

Booster Permanent Magnet, Cost

34M. Popovic

(SGD/SGF style) New permanent magnet 50% larger x 40" magnetic length

Total $ 4,234,260

contingency 20% $ 705,710

Sub-total for a quantitiy of: 300 units $ 3,528,550 (Mult parts and labor but adds tooling once)

Sub-total per magnet $ 11,679 (less tooling)

Materials $ 29,191

One-time tooling $ 25,000

Stamping die 1 $ 25,000.00

Magnet parts unit qty price per $ 4,191 matl mach fin sum

Ferrite ea 54 $ 6.00 $ 324.00

Lamination steel lbs 625 $ 0.90 $ 562.50

Stamping of pole ea 1280 $ 0.30 $ 384.00

Pole assy parts lot 1 $ 550.00 $ 550.00 150 400 550

Flux return lot 1 $ 2,020.00 $ 2,020.00 900 800 320 2020

Misc hardware lot 1 $ 350.00 $ 350.00

Labor $ 7,488

Technician techs hours value $ 3,120

Stack/assl inner core 2 8 $ 65.00 $ 1,040.00

Final assembly 2 8 $ 65.00 $ 1,040.00

Trimming 1 16 $ 65.00 $ 1,040.00

EDIA x1.4 of tech labor time $ 4,368

Page 35: M. Popovic

Old & New Linac in Tunnel

35M. Popovic

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It takes tough man to make front page of Symmetry Magazine

36M. Popovic

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Booster Tunnel & Beam

37M. Popovic

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38M. Popovic