ERL Compton scheme for CLIC
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ERL Compton scheme for CLIC. L. Rinolfi (CERN) and T. Omori (KEK) many thanks to all Posipol collaboraters CLIC WS 15-Oct-2009 CERN. World-wide PosiPol Collaboration. Collaborating Institutes: BINP, CERN, DESY, Hiroshima, IHEP, IPN, KEK, Kyoto, LAL, CELIA/Bordeaux, NIRS, NSC-KIPT,

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ERL Compton scheme for CLIC

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Erl compton scheme for clic

ERL Compton scheme for CLIC

L. Rinolfi (CERN) and T. Omori (KEK)

many thanks to all Posipol collaboraters

CLIC WS 15-Oct-2009 CERN


Erl compton scheme for clic

World-wide PosiPol Collaboration

Collaborating Institutes:

BINP, CERN, DESY, Hiroshima, IHEP, IPN, KEK,

Kyoto, LAL, CELIA/Bordeaux,NIRS, NSC-KIPT,

SHI, Waseda, BNL, JAEA and ANL

Sakae Araki, Yasuo Higashi, Yousuke Honda, Masao Kuriki, Toshiyuki Okugi, Tsunehiko Omori,

Takashi Taniguchi, Nobuhiro Terunuma, Junji Urakawa, Yoshimasa Kurihara, Kazuyuki Sakaue,

Masafumu Fukuda, Takuya Kamitani, X. Artru, M. Chevallier, V. Strakhovenko,

Eugene Bulyak, Peter Gladkikh, Klaus Meonig, Robert Chehab, Alessandro Variola, Fabian Zomer,

Alessandro Vivoli, Richard Cizeron, Viktor Soskov, Didier Jehanno,

M. Jacquet, R. Chiche, Yasmina Federa, Eric Cormier, Louis Rinolfi, Frank Zimmermann, Kazuyuki Sakaue,

Tachishige Hirose, Masakazu Washio, Noboru Sasao, Hirokazu Yokoyama, Masafumi Fukuda, Koichiro Hirano,

Mikio Takano, Tohru Takahashi, Hirotaka Shimizu, Shuhei Miyoshi, Yasuaki Ushio, Tomoya Akagi, Akira Tsunemi,

Ryoichi Hajima, Li XaioPing,Pei Guoxi,Jie Gao, V. Yakinenko, Igo Pogorelsky, Wai Gai, and Wanming Liu

POSIPOL 2010

Tsukuba

POSIPOL 2006

CERN Geneve

26-27 April

POSIPOL 2008

Hiroshima

16-18 June

http://posipol2006.web.cern.ch/Posipol2006/

http://home.hiroshima-u.ac.jp/posipol/

POSIPOL 2007

LAL Orsay

23-25 May

POSIPOL 2009

Lyon

23-26 June

http://indico.cern.ch/internalPage.py?pageId=1&confId=53079

http://events.lal.in2p3.fr/conferences/Posipol07/


Erl compton scheme for clic

Two ways to get pol. e+

(1) Helical Undurator

e- beam

E >150 GeV

Undulator

L > 200 m

(2) Laser Compton


Erl compton scheme for clic

Two ways to get pol. e+

(1) Helical Undurator

e- beam

E >150 GeV

Undulator

L > 200 m

Our Proposal

(2) Laser Compton


Erl compton scheme for clic

Why Laser-Compton ?

i) Positron Polarization.

ii) Independence

Undulator-base e+ : use e- main linac

Problem on design, construction,

commissioning, maintenance,

Laser-base e+ : independent

Easier construction, operation,

commissioning, maintenance

iii) Polarization flip @ 50 Hz

iv) High polarization

v) Low energy operation (exsmpl: Ecm = 230 GeV)

Undulator-base e+ : not suitable

Laser-base e+ : no problem


Erl compton scheme for clic

Three of Compton schemes

for CLIC and ILC

1. Ring-based Compton.

2. ERL-based Compton.

3. Linac-based Compton.


Erl compton scheme for clic

Three of Compton schemes

for CLIC and ILC

1. Ring-based Compton.

My talk

today

2. ERL-based Compton.

3. Linac-based Compton.


Erl compton scheme for clic

ERL Compton

Re-use Concept

laser pulse stacking cavities

efficient photon beam

positron stacking in main DR

ERL

e-Linac or E-gun

efficient electron beam

to main linac


Erl compton scheme for clic

325 MHz

31 MHz

Optical Cavity for

Pulse Laser Beam Stacking

Reuse high power

laser pulse

by optical cavity

Laser-electron

small crossing angle

Laser bunches

collision is

not head-on

Lcav = n 

Lcav = m Llaser

Cavity

Enhancement Factor = 1000 - 105


Erl compton scheme for clic

ERL based Compton source

laser-pulse stacking cavity

1.8 GeV

1.8 GeV - E_loss

gamma rays

E_loss : beam energy loss cased

by Compton scatterings

10 MeV

1.8 GeV - E_loss

superconducting electron linac

1.8 GeV

1.8 GeV

10 MeV

dump 10 MeV

injection 10 MeV

RF-Gun

accelerating electron bunches

(take energy from acc. cavities)

decelerating electron bunches

(give energy to acc. cavities)


Erl compton scheme for clic

Points of ERL: 1

Re use: Energy of electron beam

Throw away: electron beam.


Erl compton scheme for clic

Points of ERL: 1

Re use: Energy of electron beam

Throw away: electron beam.

Points of ERL: 2

Fresh, high quality beam

Small spot size (10 micron) at CP.


Erl compton scheme for clic

Points of ERL: 1

Re use: Energy of electron beam

Throw away: electron beam.

Points of ERL: 2

Fresh, high quality beam

Small spot size (10 micron) at CP.

Points of ERL: 3

Short bunch (< 1 ps) at CP. (non head-on)

Beam compression (3 ps to < 1 ps)


Erl compton scheme for clic

ERL based Compton source

laser-pulse stacking cavity

1.8 GeV

1.8 GeV - E_loss

gamma rays

E_loss : beam energy loss cased

by Compton scatterings

compression

decompression

10 MeV

1.8 GeV - E_loss

superconducting electron linac

1.8 GeV

1.8 GeV

10 MeV

dump 10 MeV

injection 10 MeV

RF-Gun

accelerating electron bunches

(take energy from acc. cavities)

decelerating electron bunches

(give energy to acc. cavities)


Erl compton scheme for clic

Points of ERL: 1

Re use: Energy of electron beam

Throw away: electron beam.

Points of ERL: 2

Fresh, high quality beam

Small spot size (10 micron) at CP.

Points of ERL: 3

Short bunch (< 1 ps) at CP.

Beam compression (3 ps to < 1 ps)

Points of ERL: 4

Need steady exchange of energy:

Accel-Bunches, Decel-Bunches, Klystrons

Need CW operation


Erl compton scheme for clic

CLIC e+ source parameters

• 4.2 x 109 e+/bunch (exit of Pre Damping Ring:PDR)

• E (PDR and DR) = 2.86 GeV

• Tb-to-b = 0.5 ns

• CDR = CPDR ~ 400 m

• Nbunch = 312 / trian

• Frep = 50 Hz (Ntrain = 50/sec)


Erl compton scheme for clic

Compare ERL and CLIC

ERL : CW device

CLIC : short pulse 150 ns & high rep. 50 Hz

(312 bunches w/ 0.5 ns spacing)

How to adapt ERL to CLIC?


Erl compton scheme for clic

Solution

Put 2 stacking rings (SRs) between ERL and PDR

to separate stacking and damping functions.

ERL

1

1

321

321

2

2

3

3

SR1

SR2

2

1

3

312

C = 48m

C = 48m

47 m

PDR

C = 400 m

Kill 321 - 312 = 9 bunches


Erl compton scheme for clic

Configuration


Erl compton scheme for clic

Stacking Ring (SR)

SR makes stacking and pre2damping

• C = 48.15 m

• 0.156s / turn

• 321 bunches in a ring

321 x 0.5 ns x 0.3 m/ns = 48.15 m

• stack in the same bucket every 64th turn

(injected beam: Tb-to-b = 32 ns --> explain later)

• N of stacking in the same bucket = 2003

64x2003 = 128 192 turns = 1.2 x 105 turns

0.156 s x 1.2 x 105 = 19.9979 ms  20 ms

• "Stacking = 20 ms" + "Damping in SR = 20 ms"

--> total 40 ms /cycle (25 Hz)

match


Erl compton scheme for clic

Stacking in a SR : part 1

We give labels "1" to "321" to the buckets in the SR.

1

321

2

320

3

64

257

65

SR

C = 48 m

193

129


Erl compton scheme for clic

Stacking in a SR : part 2

• 1st turn 1 65 129 193 257

• 2nd turn 321 64 128 192 256

• 3rd turn 320 63 127 191 255

• 64th turn 2 66 130 194 258

• 65th turn 1 65 129 193 257

• 66th turn 321 64 128 192 256


Erl compton scheme for clic

Timing Chart

Time [ ms ]

0

20

40

60

80

100

120

140

ERL(CW)

to SR1

to SR1

to SR1

to SR1

to SR2

to SR2

to SR2

SR1(25Hz)

stack

damp

stack

damp

stack

damp

stack

to PDR

to PDR

to PDR

SR2(25Hz)

stack

damp

stack

damp

stack

damp

to PDR

to PDR

to PDR

from SR1

from SR1

from SR1

from SR2

from SR2

from SR2

PDR(50Hz)

DR(50Hz)


Erl compton scheme for clic

Number of g-rays/ e+s

• e- beam (ERL)

3 x 109 e-/bunch

E = 1.8 GeV

• Laser

600 mJ / cavity

1 cavity in ERL

• 5 x 108g-rays/bunch

• 2.5 x 106 e+/bunch

• 5 x 109 e+/bunch (CLIC requires 4.2 x 109)

collision

thin conversion target: yield 0.5 %

2003 stacking in the same bucket


Erl compton scheme for clic

ERL

• 3 x 109 e-/bunch

• E = 1.8 GeV

• Tb-to-b = 32 ns

• Fref = 31.25 MHz

• FRF = 1 GHz (for example)

Tb-to-b = 32 nsec

1 nsec (1 GHz)

Tb-to-b = 32 nsec

Accelerating bunches

Decelerating bunches


Erl compton scheme for clic

Summary

• ERL scheme can provide small spot size and short pulse

at the laser-electron collision point.

Especially short pulse (< 1ps) is big advantage.

• A solution where stacking and damping are decoupled

seems possible to fulfill CLIC requirements with an

ERL scheme

• Challenge remains to be demonstrated in order to make

2000 stacking in a same bucket.

There was a simulation for ILC-ERL-Compton by

F. Zimmerman. The result was encouraging.

• Stacking ring with 48 m circumference and 1 GeV

is also a challenge.

• The cost increase with 2 storage rings is not an

issue compared to the rest of the complex.


Erl compton scheme for clic

Backup slides


Erl compton scheme for clic

Status of Compton Source

Proof-of-Principle demonstration was done.

ATF-Compton Collaboration

Polarized -ray generation: M. Fukuda et al., PRL 91(2003)164801

Polarized e+ generation: T. Omori et al., PRL 96 (2006) 114801

We still need many R/Ds and simulations.

We have 3 schemes.

Choice 1 : How to provide e- beam

Storage Ring, ERL, Linac

Choice 2 : How to provide laser beam

Wave length (=1m or =10m )

staking cavity or non stacking cavity

Choice 3 : e+ stacking in DR or Not


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