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Compton Ring/ERL e+ Source

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1 Compton Ring/ERL e+ Source
for ILC/CLIC Tsunehiko OMORI (KEK) Compton Source for X/gamma Rays 12-Sep Sardinia, Italy

2 Today's Talk Two Energy Frontier Machines LHC and a Linear Collider
2. Why Liner Collider 3. Why Beam Polarization 4. Why Laser-Compton for ILC/CLIC e+ Source 5. Ring/ERL Compton e+ Source 6. R/Ds and PosiPol Collaboration 7. Summary

3 Energy Frontier Machines
Two Energy Frontier Machines

4 LHC Large Hadron Collider
Energy Frontier Machines LHC Large Hadron Collider ILC Liner Collider Central Campus Main Linac Tunnel CERN pp collider Detector Hall Circumference = 27 km e- e+ collider L = km Tunnel and Facility Superconducting Magnets Superconducting RF Accelerating Module ATLAS detector 40m x 40 m x 40 m 4 4

5 LHC Large Hadron Collider
Energy Frontier Machines LHC Large Hadron Collider ILC Liner Collider First Beam Sep 10th! Central Campus Main Linac Tunnel CERN pp collider Detector Hall Circumference = 27 km e- e+ collider L = km Tunnel and Facility Superconducting Magnets Superconducting RF Accelerating Module ATLAS detector 40m x 40 m x 40 m 5 5

6 Why Linear Collider

7 Why we need e-e+ collider ?
pp collider (LHC) e-e+ : elementary particles CMS energy = 2 x beam energy (well defined) Total momentum = 0 (balanced) p p e-e+ collider (ILC/CLIC) e- e+

8 Why we need e-e+ collider ?
pp collider (LHC) e-e+ : elementary particles CMS energy = 2 x beam energy (well defined) Total momentum = 0 (balanced) p p e-e+ collider (ILC/CLIC) e- e+

9 Why we need e-e+ collider ?
pp collider (LHC) e-e+ : elementary particles CMS energy = 2 x beam energy (well defined) Total momentum = 0 (balanced) p p e-e+ collider (ILC/CLIC) e- e+

10 Why we need e-e+ collider ?
pp collider (LHC) e-e+ : elementary particles CMS energy = 2 x beam energy (well defined) Total momentum = 0 (balanced) Small back ground Mostly full reconstruction p p e-e+ collider (ILC/CLIC) e- e+

11 Why we need e-e+ collider ?
pp collider (LHC) e-e+ : elementary particles CMS energy = 2 x beam energy (well defined) Total momentum = 0 (balanced) Small back ground Mostly full reconstruction p p e-e+ collider (ILC/CLIC) e- e+ Precision data Reconstruct laws of physics

12 Why we need e-e+ collider ?
pp collider (LHC) e-e+ : elementary particles CMS energy = 2 x beam energy (well defined) Total momentum = 0 (balanced) Small back ground Mostly full reconstruction p p e-e+ collider (ILC/CLIC) Beam polarization e- e+ pol. pol. Why polarized beams?

13 Why Beam Polarization?

14 R-hand electron (e-R) and L-hand electron (e-L)
Spin e- R Momentum e- L

15 e- R e- L R-hand electron (e-R) and L-hand electron (e-L)
are different particles in high energy Spin e- R NO Weak Interaction e-R Momentum e-L nL e- L Weak Interaction

16 e- R e- L e+ R e+ L R-hand electron (e-R) and L-hand electron (e-L)
are different particles in high energy Spin e- R NO Weak Interaction e-R Momentum e-L nL e- L Weak Interaction R-hand positron (e+R) and L-hand positron (e+L) are different particles in high energy Spin e+R nR e+ R Weak Interaction Momentum e+ L e+L NO Weak Interaction

17 Example : Scaler mR search (Min. SUSY)
~ Signal e- c0 ~ (invisible) m+ m+R ~ e+ c0 ~ (invisible)

18 Example : Scaler mR search (Min. SUSY)
~ Signal e- c0 ~ (invisible) m+ m+R ~ e+ c0 ~ (invisible) Background : W- W+ pair m- e- W- n (invisible) n m+ e+ W+ n (invisible) m- e- W- n (invisible) W3 m+ e+ W+ n (invisible)

19 Example : Scaler mR search (Min. SUSY)
Monte Carlo Sim. non pol. W-W+ ~ ~ m-Rm+R

20 Example : Scaler mR search (Min. SUSY)
~ Signal e-R c0 ~ (invisible) m+ m+R ~ e+L c0 ~ (invisible) Background : W- W+ pair m- e-R W- n (invisible) nR m+ e+L W+ n (invisible) m- e-R W- n (invisible) W3 m+ e+L W+ n (invisible)

21 Example : Scaler mR search (Min. SUSY)
~ Signal e-R c0 ~ (invisible) m+ m+R ~ e+L c0 ~ (invisible) Background : W- W+ pair m- e-R W- NO n (invisible) nR m+ e+L W+ n (invisible) m- e-R W- NO n (invisible) W3 m+ e+L W+ n (invisible)

22 Example : Scaler mR search (Min. SUSY)
~ Signal e-R c0 ~ (invisible) m+ m+R ~ e+L c0 ~ Coupling (invisible) e+R e-L Y = -1/2 s = 1 e+L e-R Larger Y = s = 4 Background : W- W+ pair m- e-R W- NO n (invisible) nR m+ e+L W+ n (invisible) m- e-R W- NO n (invisible) W3 m+ e+L W+ n (invisible)

23 Example : Scaler mR search (Min. SUSY)
Monte Carlo Sim. non pol. pol e- = 80%(R) pol e+ = 60%(L) W-W+ ~ ~ ~ ~ m-Rm+R m-Rm+R W-W+

24 Why polarized beams ? e-R and e-L are different particles nL e-R e-L
(A) In high energy, e-R and e-L are different particles e-L nL NO Weak Interaction e-R Weak Interaction e+R and e+L are different particles e+R nR NO Weak Interaction e+L Weak Interaction (B) Chose initial state (e-Re+L , e-Le+R, ....) (1) Suppress background (esp. e-e+ -> W-W+) (2) Enhance specific int. (3) Control angular dist. of final state (4) Determine weak mix of the final (5) Reduce sys. errors (6) Study why nature chose (A) (hint neutrino osc.)

25 Why Laser-Compton for ILC/CLIC e+ source

26 Two ways to get pol. e+ (1) Helical Undurator (2) Laser Compton
e- beam E >150 GeV Undulator L > 200 m (2) Laser Compton

27 Two ways to get pol. e+ (1) Helical Undurator (2) Laser Compton
e- beam E >150 GeV Undulator L > 200 m Our Proposal (2) Laser Compton

28 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

29 ILC Undulator-base e+ Source
150 GeV 250 GeV 250 GeV Experiments

30 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

31 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 5Hz (for 50 Hz) iv) High polarization v) Low energy operation Undulator-base e+ : need deceleration Laser-base e+ : no problem

32 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 5Hz (for 50 Hz) iv) High polarization v) Low energy operation Undulator-base e+ : need deceleration Laser-base e+ : no problem vi) Synergy in wide area of fields/applications

33 Status of Compton e+ 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)

34 Status of Compton e+ 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)

35 Asymmetry Measurements
e+ run A = 0.90 ± 0.18 % T. Omori et al., PRL 96 (2006) T. Omori et al., PRL 96 (2006)

36 Asymmetry Measurements
e+ run e- run A = 0.90 ± 0.18 % A = 0.89 ± 0.19 % T. Omori et al., PRL 96 (2006) T. Omori et al., PRL 96 (2006)

37 Status of Compton e+ 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) We still need many R/Ds and simulations. We heard many talks in this WS

38 Status of Compton e+ 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) We still need many R/Ds and simulations. We heard many talks in this WS 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

39 Laser Compton e+ Source for ILC/CLIC
We have 3 schemes. 1. Ring Base Laser Compton Storage Ring + Laser Stacking Cavity (=1m), and e+ stacking in DR S. Araki et al., physics/ 2. ERL Base Laser Compton ERL + Laser Stacking Cavity (=1m), and e+ stacking in DR 3. Linac Base Laser Compton Linac + non-stacking Laser Cavity (=10m), and No stacking in DR Proposal V. Yakimenko and I. Pogorersky T. Omori et al., Nucl. Instr. and Meth. in Phys. Res., A500 (2003) pp Good! But we have to choose!

40 Laser Compton e+ Source for ILC/CLIC
We have 3 schemes. 1. Ring Base Laser Compton Storage Ring + Laser Stacking Cavity (=1m), and e+ stacking in DR S. Araki et al., physics/ 2. ERL Base Laser Compton ERL + Laser Stacking Cavity (=1m), and e+ stacking in DR 3. Linac Base Laser Compton Linac + non-stacking Laser Cavity (=10m), and No stacking in DR Vitaly's talk today Proposal V. Yakimenko and I. Pogorersky T. Omori et al., Nucl. Instr. and Meth. in Phys. Res., A500 (2003) pp Good! But we have to choose!

41 Laser Compton e+ Source for ILC/CLIC
We have 3 schemes. 1. Ring Base Laser Compton Storage Ring + Laser Stacking Cavity (=1m), and e+ stacking in DR Variola's talk on 11th S. Araki et al., physics/ 2. ERL Base Laser Compton ERL + Laser Stacking Cavity (=1m), and e+ stacking in DR Variola's talk on 11th 3. Linac Base Laser Compton Linac + non-stacking Laser Cavity (=10m), and No stacking in DR Vitaly's talk today Proposal V. Yakimenko and I. Pogorersky T. Omori et al., Nucl. Instr. and Meth. in Phys. Res., A500 (2003) pp Good! But we have to choose!

42 Laser Compton e+ Source for ILC/CLIC
We have 3 schemes. My talk today 1. Ring Base Laser Compton Storage Ring + Laser Stacking Cavity (=1m), and e+ stacking in DR Variola's talk on 11th S. Araki et al., physics/ 2. ERL Base Laser Compton ERL + Laser Stacking Cavity (=1m), and e+ stacking in DR Variola's talk on 11th 3. Linac Base Laser Compton Linac + non-stacking Laser Cavity (=10m), and No stacking in DR Vitaly's talk today Proposal V. Yakimenko and I. Pogorersky T. Omori et al., Nucl. Instr. and Meth. in Phys. Res., A500 (2003) pp Good! But we have to choose!

43 Ring/ERL Compton Scheme

44 Ring Base Compton (an example)
Re-use Concept laser pulse stacking optical cavities Re-use photon beam positron stacking in main DR Electron storage ring (or ERL) Re-use electron beam to main linac

45 Compton Ring Scheme for ILC
Compton scattering of e- beam stored in storage ring off laser stored in Optical Cavity. 5.3 nC 1.8 GeV electron bunches x 5 of 600mJ stored laser -> 2.3E+10 γ rays -> 2.0E+8 e+. By stacking 100 bunches on a same bucket in DR, 2.0E+10 e+/bunch is obtained. Electron Storage Ring 1.8 GeV 1.8 GeV booster preliminary

46 ERL scheme for ILC 1000 times of stacking in a same bunch
High yield + high repetition in ERL solution. 0.48 nC 1.8 GeV bunches x 5 of 600 mJ laser, repeated by 54 MHz -> 2.5E+9 γ-rays -> 2E+7 e+. Continuous stacking the e+ bunches on a same bucket in DR during 100ms, the final intensity is 2E+10 e+. 1000 times of stacking in a same bunch SC Linac 1.8 GeV Laser Optical Cavities Photon Conversion Target Capture System To Positron Liniac RF Gun Dump preliminary

47 Ring scheme and ERL scheme are SIMILAR
Electron Storage Ring 1.8 GeV 1.8 GeV booster Ring Scheme SC Linac 1.8 GeV Laser Optical Cavities Photon Conversion Target Capture System To Positron Liniac RF Gun Dump ERL scheme

48 Compton Ring scheme for CLIC (2008)
Compton configuration for polarized e+ 2.424 GeV e+ DR 2.424 GeV 460 turns makes 312 bunches with 6.4x109 e+/bunch e+ PDR and Accumulator ring C = 47 m, 156 ns/turn, 312 bunches with 6.2x1010 e-/bunch Injector Linac 2.2 GeV 2 GHz RF gun Drive Linac 1.3 GeV 2 GHz Compton ring 2 GHz 50 Hz Pre-injector Linac for e+ 200 MeV g Stacking cavity g (23-29 MeV) 7x108 /turn/bunch 1.4x107 pol. e+/turn/bunch e+ target F. Zimmermann & L. Rinolfi 1 YAG Laser pulse

49 PosiPol Collaboration
R/Ds and PosiPol Collaboration

50 R&D items Fiber laser / Mode-lock laser (CELIA/Bordeaux)
CR/ERL simulations studies (Kharkov, LAL, JAEA, KEK) design studies beam dynamics studies Urakawa-san's talk 11th Optical Cavity (LAL, Hiroshima, KEK) Variola-san's talk 11th experimental R/D Fabian-san's talk 10th e+ capture (LAL, ANL) We will start collaboration with KEKB upgrade study e+ stacking in DR (CERN) Basic beam dynamics studies Laser Fabian-san's talk 11th Fiber laser / Mode-lock laser (CELIA/Bordeaux) CO2 laser (BNL) Vitaly-san's talk today

51 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, Takuya Kamitani, Yoshisato Funahashi, 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 2006 CERN Geneve 26-27 April POSIPOL 2008 Hiroshima 16-18 June POSIPOL 2007 LAL Orsay 23-25 May

52 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, Takuya Kamitani, Yoshisato Funahashi, 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 2006 CERN Geneve 26-27 April POSIPOL 2008 Hiroshima 16-18 June POSIPOL 2007 LAL Orsay 23-25 May POSIPOL 2009 CERN/ near CERN

53 R&D items Fiber laser / Mode-lock laser (CELIA/Bordeaux)
CR/ERL simulations studies (Kharkov, LAL, JAEA, KEK) design studies beam dynamics studies Optical Cavity (LAL, Hiroshima, KEK) experimental R/D e+ capture (LAL, ANL) We will start collaboration with KEKB upgrade study e+ stacking in DR (CERN) Basic beam dynamics studies Laser Fiber laser / Mode-lock laser (CELIA/Bordeaux) CO2 laser (BNL)

54 R&D items Fiber laser / Mode-lock laser (CELIA/Bordeaux)
CR/ERL simulations studies (Kharkov, LAL, JAEA, KEK) design studies beam dynamics studies Optical Cavity (LAL, Hiroshima, KEK) experimental R/D e+ capture (LAL, ANL) We will start collaboration with KEKB upgrade study Common in most of Compton Applications e+ stacking in DR (CERN) Basic beam dynamics studies Laser Fiber laser / Mode-lock laser (CELIA/Bordeaux) CO2 laser (BNL)

55 Optical Super Cavities
Example of Common R/Ds Optical Super Cavities 2-mirror cavity (Hiroshima / Weseda / Kyoto / IHEP / KEK) 4-mirror cavity (LAL) moderate enhancement moderate spot size simple control high enhancement small spot size complicated control

56 World-Wide-Web of Laser Compton

57 Laser-Compton R/D 1. Laser-Compton has a large potential as a future technology. 2. Many common efforts can be shared in a context of various applications. – Compact and high quality X-ray source for industrial and medical applications – -ray source for disposal of nuclear wastes – Beam diagnostics with Laser – Laser Cooling – Polarized Positron Generation for ILC and CLIC –  collider 3. State-of-the-art technologies are quickly evolved with world- wide synergy. – Laser Stacking Optical Cavity, – Laser, – ERL

58 Summary

59 Summary 1 1. Two Energy Frontier Machines LHC pp collider
Will Open New Era in Particle physics ILC e-e+ collider Will follow LHC and provide precision data

60 Summary 1 1. Two Energy Frontier Machines LHC pp collider
Will Open New Era in Particle physics ILC e-e+ collider Will follow LHC and provide precision dada 2. Beam polarization plays important roles in e-e+ colliders Suppress back ground Enhance specific interaction Determine Weak mixing of final state

61 Summary 1 1. Two Energy Frontier Machines LHC pp collider
Will Open New Era in Particle physics ILC e-e+ collider Will follow LHC and provide precision dada 2. Beam polarization plays important roles in e-e+ colliders Suppress back ground Enhance specific interaction Determine Weak mixing of final state 3. Compton pol. e+ source is attractive option for ILC/CLIC Independent system high polarization 5 Hz polarization flip (for CLIC 50 Hz flip) Operability

62 Summary 2 4. Three schemes are proposed Ring Laser Compton
ERL Laser Compton Linac Laser Compton

63 Summary 2 4. Three schemes are proposed Ring Laser Compton
ERL Laser Compton Linac Laser Compton My talk Today

64 Summary 2 4. Three schemes are proposed 5. We still need many R/Ds
Ring Laser Compton ERL Laser Compton Linac Laser Compton My talk Today 5. We still need many R/Ds (a) e+ stacking, (b) Ring, (c) ERL, (d) e+ capture (e) e+ production target, (e) Laser (g) Laser stacking optical cavity

65 Summary 2 4. Three schemes are proposed
Ring Laser Compton ERL Laser Compton Linac Laser Compton My talk Today 5. We still need many R/Ds ---> Good! We have many funs. (a) e+ stacking, (b) Ring, (c) ERL, (d) e+ capture (e) e+ production target, (e) Laser (g) Laser stacking optical cavity

66 Summary 2 4. Three schemes are proposed
Ring Laser Compton ERL Laser Compton Linac Laser Compton My talk Today 5. We still need many R/Ds ---> Good! We have many funs. (a) e+ stacking, (b) Ring, (c) ERL, (d) e+ capture (e) e+ production target, (e) Laser (g) Laser stacking optical cavity 6. Laser-Compton has many applications in many field. Medical applications, Industrial applications, -ray source for disposal of nuclear wastes, cargo inspections, research of cultural heritages, and also for ILC/CLIC e+ source. Many of R/D are common in most of applications


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