1 14 TeV Muon Collider - PowerPoint Presentation

Slide1

1

14 TeV Muon Collider LHC, MAP, and LEMC

David

Neuffer

July 2018

Slide2

2

OutlineNext Heavy Lepton Collider

up to ~14

TeV

in LHC tunnel

Needs muon source

PS or new MW proton

Linac

/storage ring

cooling …

or LEMC??

Affordable !!

neutrino radiation

for 14

TeV

in LHC collider

Comments on (45 GeV e

+

+ e

-

) source

interesting problems

Liouville

…

Slide3

MAP  HEPAP statusMAP produced initial designs for muon storage ring neutrino sources and heavy lepton colliders -including initial beam delivery designs for mu2e and nuSTORMP5 happened –MAP did not fit 2013 physics prioritiestoo ambitious for US resources >> US Flagship is DUNE3

Slide4

14 TeV “Next Muon Collider” 77 TeVCERN needs world-class collider Use LHC tunnelFill with accelerator and collider ring(s)Result:7 x 7 TeV colliderReuses existing infrastructure~100 m deep tunnel

cost possible ?Must add a muon sourcehigh intensity

4

Shiltsev

&

Neuffer

, IPAC 18

Slide5

14 TeV machine muon sourcesPossible beam sourcesproton based CERN PS - ~0.13 MW24 GeV6 bunches/1.2s 5Hznew MW scale proton source (~MAP)5—8 GeV linac + storage ring5Hz Electron

based Boscolo et al.e+-e-





+

- 

-

45 GeV e

+



22GeV



+



-

2.2 kHz

no cooling …

Proton-based source uses MAP-like cooling system

~1 km long single pass ~1—2 G$verified by simulationt,N 25 ; L  60 mm

5

Slide6

14 TeV Collider scenarios ..Collect parameters from various scenarioslimit  to ~1013/sτ= 0.15s Accelerate in LHC tunnelCollider in tunnelsmall β

t lattice800 luminosity turns (nt)

Collider scenarios:

6

Parameter

“PS”

“MAP”

“LEMC”

Luminosity

cm

-2

s

-1

1.2·10

33

3.5·10

35

2.4·10

32

Beam

δE

/E

0.1%

0.1%

0.2%

Rep rate, Hz

55 2200 Nμ/bunch1.2·10112·10124.5107nb111*εt,N mm-mrad2525 0.04β* , mm110.2σ*(IR), μm0.60.60.011Bunch length, m0.0010.0010.0002μ production source24 GeV p8 GeV p45 GeV e+p or e/pulse8·10122·10143·1013Driver beam power0.15MW1.3MW40 MW Acceleration, 1-3.5, 3.5-7 RCS1-3.5, 3.5-7 RCS75 GV, RLA100 turn rad. (unmitigated)0.020.300.003 mSv/yr

Slide7

Acceleration …7 TeV  lifetime = 0.15 sRCS frequencies are manageable: 5 /20 Hzhigh-field fixed magnets + ±2T rapid-cycling~18GV rfcould also use RLA fixed field magnetsnonscaling FFAG arcs ??LEMC with 2 kHz  source needs fixed-field accelerator

20 turns  350GV rf 100 turns  70GV

LHC = 11 kHz

7

Slide8

Costs ??Affordable?according to Shiltsev cost model (JINST 9 T07002 (2014)):~9 G$after ~3 G$ savings from using exiting tunnel(s)

LEMC case ?Larger power, rf ?needs further design

8

α



2B$ for civil construction,

β



1, 2 or 10 B$

for NC,

SC magnets

or SRF



≈

2B

$ wall plug power

Slide9

Decay neutrinos are emitted with a 1/

 angle

10

20

/

yr

(10

13

/beam/s)

Dose is ~0.15

mSv

/

yr

/beam

7TeV , D=100m, 36km

CERN LHC limit is ~1mSv/

yr

Neutrino

radiation

(CERN 99-12 )

9

N



=2n

B

Nf0NsPdecayEE/3B. King PAC 99 Johnson et al. CERN98-34

Slide10

Oddities of the neutrino radiation100 m deep ringR=36km band, 0.5m thick+ and - bands differLHC-100 m tilted ringtilt into Lake Geneva and Jura

effectively a bit deeper … Model assumes target stays within band within material

lying in bed in a basement room

inside a basement swimming pool

Could spread out by adding vertical oscillation

10

Slide11

Decay along straight sections?Downstream intensity enhanced by small number of straightsmost point very far away, or outside habitation zonesIR straight beams have large divergencea few close emergences0.5m radius beam at 30kBuy locations; insert neutrino detectorsmulti-TeV neutrino beams

great beam monitors – need 2For LHC muon Collider, a feature !!not a bug

 

11

Slide12

Application to 14 TeV Muon ColliderCERN standard is ~1 mSv/year(approved for LHC)Fermilab standard is 0.1mSv/yr1/10 DOE limitHigh-Luminosity LHC muon collider is ~0.3 mSv/year 1020 /year/beamCan be reduced by orbit modulation~1/10Is a significant consideration

limits luminosity, and energy12

Slide13

LEMC scenario (Boscolo et al.)Scenario has very interesting featuresand problemsand solutions ?Requires positron source45 GeV positron ring22 GeV muon accumulator rings~cw accelerationcollider ring no cooling Liouville’s theorem

13

e

+

(45 GeV)

+e

-

(rest)



+

+



-

small 

t

: 1mrad *0.2*10

-6

m

at 

e

= 0

large 

L

: 2 GeV*0.003m

Slide14

45 GeV positron ring on Be targetA Problem is Be Target (3mm)e- + nucleiLifetime is < 50 turns3 1016 45 GeV e+/s (200MW)multiple scattering & Bremstrahlung3mm Be = ~1% X0~1% energy loss /turn

emittance increase if β > 0.2m

at



x,geo,e

= ~6

10

-9

m

14

Slide15

positron and muon beams must match,geo, 0.2∙10-9 m IF 

,geo,e = 0 (and σe+=0)

but



x,geo,e

= ~6

10

-9

m

+

In IPAC 17

(

Boscolo

et al.)

σ

e

+ = ~0.1 –0.3 mm at target

should be < 1mTo avoid large 

, need: 

x,geo,e+ <

10

-9

m

β

< ~0.003m15

Slide16

Another Problem – high energy stackingProduce bunches every 500 saccelerate into 7 TeV ring with RLA/FFAG; collide Bunch combination at high energy?“topping up” works in electron rings because of radiation dampingDoes not work in muon rings because of Liouville’s theoremcan have multiple bunches in collider ring (but not combined)

stacking in longitudinal phase space is limited1 bunch = ~ MAP goal longitudinal emittancestacking in transverse phase space reduces luminosity

16

Antonelli

, ICHEP2016

Slide17

22 GeV muon ringsFor multi turn accumulation (at ~ 2 kHz)εt,N = 4∙10-8 m, εL =~3 mm ∙ 2GeV/0.1 ~0.06mC =60m 2290 turns If accumulating muons are recirculated through target, can

multiturn inject without increasing ε

But ….

needs matched lattice at target (

β

*

= 3mm ?),

momentum acceptance – 10% - isochronous /matched

rf

Closest example is 62.5 GeV Higgs collider lattice

Y.

Alekhin

et al.

300m,

β

*

=

3cm,

εt,N = 2∙10-4 m, δ < 0.1%17

Slide18

But … Liouville …2000 turn multiple scattering is not smalleven with = 3mm, εN =4∙ 10-8 m

εN 2

∙

10

-6

??

dE

/turn ~ 1.5 MeV

 2 GeV total

need

rf

for reacceleration

Solution

Use Third Law of Beam physics

does not fit in the margins of this talk

18

Slide19

Summary~14 TeV + - Collider in LHC tunnel is possible Can use proton driver from PS or new Linachigh luminosity requires muon coolingmore cooling is better… or novel low-emittance sourceneutrino radiation is a constraintmanageable …new muon source (45 GeV e+ + e

-  + 

-

) poses interesting challenges

more beam physics study …

use 3

rd

Law

19

Slide20

Thank you for your attention 20

Slide21

High Energy to 14 TeV at LHCCERN is interested in +- site-fillerfits in LHC tunnel7 x 7 TeV – 14 TeV ColliderCould consider for muon source:PS-based proton source + coolingMAP 8GeV 2MW p + cooling

threshold 45 GeV e+ ring + e- productionLEMC-

Boscolo

et al. –no cooling

21

Shiltsev

&

Neuffer

, IPAC 18

Slide22

22

Slide23

3 Laws of Beam PhysicsBeam Phase Space cannot decreaseLiouville’s theorem cannot be violatedBeam Phase Space increasesbunch combination is inefficientBreak the 1st Law wherever possibleradiation dampingstochastic cooling

electron coolingionization coolingcharge-exchange injection“stochastic injection” (

π



 decay)

??

23