CLIC 08 Overview on the CLIC instrumentation requirements

CLIC 08 Overview on the CLIC instrumentation requirements • Overview of the CLIC Machine • Beam instrumentation requirements by Sub-systems • Conclusions T. Lefevre, CERN AB/BI

CLIC 3 Te. V CLIC 08 326 klystrons 33 MW, 139 ms drive beam accelerator 2. 38 Ge. V, 1. 0 GHz Circumferences delay loop 72. 4 m CR 1 144. 8 m CR 2 434. 3 m 1 km delay CR 2 loop CR 1 BDS 2. 75 km BC 2 TA R=120 m 326 klystrons 33 MW, 139 ms drive beam accelerator 2. 38 Ge. V, 1. 0 GHz combiner rings , e- main linac , 12 GHz, 100 MV/m 20. 8 km CR 2 delay loop CR 1 decelerator, 24 sectors of 868 m BDS 2. 75 km IP 1 BC 2 e+ main linac 47. 9 km booster linac, 9 Ge. V, 2 GHz or 4 GHz ? BC 1 e- injector 2. 4 Ge. V e- DR 365 m 1 km e+ DR 365 m e+ injector, 2. 4 Ge. V 245 m TA

CLIC 3 Te. V : Main Beam CLIC 08 • Producing measuring small beam emittance drive beam and accelerator drive beam accelerator • Producing and measuring short Bunches 1 km delay CR 2 loop • Conserving small beam emittance (very strict tolerances/requirements CR 1 on the beam position monitor precision and resolution) Drive Beam Decelerator BDS BC 2 BDS IP 1 main linac , 12 GHz, 100 MV/m, Final Focus e- linac Entrance R=120 20. 8 km gex : 0. 66 mm. mrad TA m gex : 0. 60 mm. mrad gey : 0. 01 mm. mrad DE/E : 1. 5% sz : 45 mm (150 fs) BC 2 e+ main linac gey : 0. 02 mm. mrad DE/E : 0. 35% sx = 40 nm sy = 1 nm 47. 9 km booster linac, 9 Ge. V, 2 GHz or 4 GHz ? Damping ring gex : 10 -> 0. 381 mm. mrad gey : 10 -> 0. 004 mm. mrad DE/E : 0. 134% sz : 1. 5 mm (5 ps) BC 1 e- injector 2. 4 Ge. V e- DR 365 m e+ injector, 2. 4 Ge. V 245 m TA

CLIC 3 Te. V : Drive Beam CLIC 08 Drive Beam frequency multiplication complex Drive Beam accelerator I : 4. 2 A ; Qb : 8. 4 n. C : Dt : 140 ms ge : < 100 mm. mrad DE/E : <1% sz : 4 mm (13. 3 ps) sz : 2 mm (6. 6 ps) I : 4. 2 – 8. 4 - 25. 2 - 101 A Db : 60 - 30 - 10 - 2. 5 cm delay loop CR 2 CR 1 • Manipulating high charge beams (machine protection issue, intercepting beam diagnostic, . . ) 24 Drive Beam decelerators I : 101 A ; Dt=241 ns ge : 150 mm. mrad sz : 1 mm (3. 3 ps) radiation level, non 2. 38 Ge. V 238 Me. V High efficiency high power 12 GHz RF • In addition, there are very strict tolerances/requirements on source the beam phase stability IP 1 ‘How to transform a long low current low frequency beam (0. 1º@12 GHz) into a series of short beams with a high current and a high frequency’ • Reliability and availability : This is ‘just’ the RF Source ! Final time structure Initial time structure 140 ms length – 4. 2 A @ 2. 4 Ge. V 60 cm between bunches 24 x 240 ns pulse spaced by 5. 8 ms 101 A, 2. 5 cm between bunches

CLIC 08 CLIC Beam lines • 2 Drive beam accelerators (2 x 1 km) • 2 Delay loop and 4 Combiner rings (2 x 657 m) • 2 Long Transfer lines (2 x 20. 8 km) CLIC RF source • 48 Turn arounds (48 x 110 m) • 48 Drive beam decelerators (48 x 878 m) • Electron injector (250 m) • Positron injector (500 m) • Damping rings (4 x 365 m) • Bunch compressor 1 (2 x 35 m) • Booster Linac (500 m) • Long transfer lines (2 x 20. 8 km) • Turn around (2 x 1. 1 km) • Bunch compressor 2 (2 x 150 m) • Main Linac (2 x 20. 8 km) • Beam Delivery System (2 x 2. 75 km) • Post Collision line (2 x 250 m) Drive Beam ~ 92 kms of beam lines Main Beam ~ 94 kms of beam lines

Instruments CLIC 08 Bunch length (sz) Beam Current I Beam Phase Luminosity Beam Halo or Tail Beam Polarization Beam losses Beam Position (x / y) Beam energy E and energy spread DE Beam size (sx / sy)

Instrumentation requirement CLIC 08 For each sub-systems Instrument Accuracy Resolution Bandwidth Beam Nontube Stability intercepting aperture device? Machine How Used in RT protection many? Feedback? Item ? Intensity Position Beam Size / Emittance Energy Spread Bunch Length Beam Loss Beam Halo Beam Phase Beam Polarization Luminosity Wakefield monitor Identify need for Commissionning / Production Beams

CLIC 08 Instrumentation requirement Identify the critical items in each sub-systems (performance, cost, feasibility)

Electron and Positron Injector CLIC 08 e- PDR Primary beam Linac for e 5 Ge. V e- gun e-/g g/e+ Target 2. 2 Ge. V Injector Linac e+ PDR 2 GHz 228 m Pre-injector Linac for e+ Pre-injector Linac for e- 200 Me. V Laser DC gun Polarized e-

Instrumentation requirement CLIC 08 Electron injector Instrument Accuracy Instrument Intensity Accuracy 1 x 10^8 Instrument Position Intensity Beam Size / Emittance Intensity Position Energy Position Beam Size / Emittance Energy Beam Size /Spread Emittance Energy Bunch Length Energy Spread Beam. Length Loss Energy Spread Bunch Beam Resolution 2 x 10^7 Bandwidth 1 GHz Accuracy 100 mm 1 x 10^8 0. 5 mm 1 x 10^8 100 mm 1%mm 100 0. 5 mm 0. 51% mm 1% 31% ps Resolution 50 mm 2 x 10^7 0. 1 mm 2 x 10^7 50 mm 0. 50% 50 mm 0. 1 mm 0. 50% 1 ps 0. 50% Bandwidth 1 GHz 31% ps 0. 50% 1 ps 1 GHz Beam Halo Bunch Beam. Length Loss Beam. Phase Loss Beam Halo 3 ps 1 ps Beam Polarization Beam Halo Beam Phase 5% Luminosity Beam Phase Beam Polarization Wakefield monitor Beam Polarization Luminosity Wakefield monitor Non- Electron for Positron Resolution Bandwidth Stability intercepting tube source aperture device? Beam Non. Positron injector 1% 1 GHz 11 GHz tube 40 mm Stability intercepting yes Beam Nonaperture device? tube 40 mm Stability intercepting yes 40 mm yes aperture device? no 40 �mm yes no yes 40 mm no no no E BL yes/no A no EV 1 GHz QU RE IR EN M E TS I H AC Machine How Used in RT protection many? Feedback? Item ? Machine How Used in RT protection 43 Machine many? How Feedback? Used in RT Item ? protection 43 many? Feedback? 30 Item ? 1 35 30 4 35 1 4 1 2 no yes/no 2 1 yes/no 1

Damping Ring CLIC 08 Instrument Accuracy Resolution Intensity Position Tune Beam Size / Emittance Energy Spread Bunch Length Beam Loss Beam Halo Beam Phase Beam Polarization Luminosity Wakefield monitor 2 mm 0. 01% < 0. 8 pm. rad Non. Machine Beam tube How Used in RT Bandwidth Stability intercepting protection aperture many? Feedback? device? Item ? bunch by 20/9 mm 5 bunch turn/turn 20/9 mm 300 (10 MHz) d few n a s M ch BP ion solut e r m m 1 y bun b h bility c a n t u s b n i Few t ion • 0. 10% ack s b a f d e n f r beam - cloud a d e t BPM fo <r 0. 1 mm e a n r i itors dom to fo n c S o e B t I m e r s D o s • tails f Fast am lo e e r B u f s o a • Me need e h t n io • Ment 2 1 1 1 yes

CLIC 08 RTML • Transport (long transfer lines, turn around, . . ) • 6 D Phase Space Shaping and Matching (bunch compressors and collimators) • Acceleration • Re-orientation of Polarization vector • Correction / tuning (phase correction and synchronization) • Intermediate beam dumps with spectrometer lines

CLIC 08 RTML Pre - Bunch compressor 1 Beam In Bunch compressor 1 Resolution Bandwidth tube Stability Non. How Used in RT Instrument Accuracy intercepting many? Feedback? Nonaperture device? Beam tube How Used in RT Bunch compressor 1 – Booster Linac Instrument Accuracy Stability intercepting Intensity 10 p. C Resolution 0. 6 p. C Bandwidth standard yes 10 aperture many? Feedback? device? Non. Beam tube How Used in RT Booster Linac - flat Bunch compressor 2 yes Position 100 µm Resolution 10 µm Bandwidth standard 30 Instrument Accuracy Intensity 10 p. C 0. 6 p. C rectangular Stability intercepting yes 2 aperture many? Feedback? device? Non. Beam Size / Emittance / 0. 1 µm standard yes/no 16 Beam tube How Used in RT Position In Bunch compressor 2 100 µm flat rectangular yes 2 Instrument Accuracy Resolution Bandwidth Stability intercepting Intensity 10 p. C 0. 6 p. C 40 mm yes 6 aperture many? Feedback? Energy / 1 Me. V standard yes/no 2 device? Non. Beam Size / Emittance / 0. 1 µm flat rectangular yes/no 2 t tube Bunch. Beam compressor 2 or Used in RT Position 100 µm 10 µm Post 40 mm yes h 40 s. How Instrument Accuracy Resolution Bandwidth Stability intercepting d Energy Spread n 0. 2 Me. V standard no 2 Intensity 10 p. C 0. 6 p. C standard yes 20 a e aperture many? Feedback? c Energy / 1 Me. V flat rectangular yes/no 2 nyes/no a t t i device? Nonm Beam Size / Emittance / 0. 1 µm 12 e / Beam tube How Used in RT Bunch Length / 10µm µm Resolution 10 µm Bandwidth standard yes/no 2 size. Stability Position 100 10 /µm standard yes 2000 m a Energy Spread Instrument Accuracy intercepting 0. 2 flat rectangular no 22 e Intensity b 10 p. C 0. 6 Me. V p. C flat rectangular yes l l aperture many? Feedback? Energy / 1 Me. V yes/no 2 sma standard device? Beam Loss Beam. Bunch Size /Length Emittance / 0. 1 µm easure yes/no 100 m Position 100 µm flat rectangular yes 2 to e u Energy Spread Intensity 0. 2 Me. V no 24 d 10 p. C 0. 6 p. C standard yes s e Beam Halo i t Energy l / 1 Me. V standard yes/no 2 u c i Beam Loss f f t i Beam Size / Emittance / 0. 1 µm flat rectangular yes/no 2 e D y • d Position Bunch Length 100 µm standardpecifie yes 20 h / 1 n µm /10 1 µm yes/no 2 t g Beam Phase Energy Spread 0. 2 Me. V standard no 2 s t o Beam Halobunch/ l 1 e. Me. V n Energy / 1 Me. V flat rectangular yes/no 2 n o i t a Beam Size / Emittance / 0. 1 µm standard yes/no 10 Beam Loss m i l l Beam Polarization o 2 Bunch Length C or f Beam Phase Energy Spread n 0. 2 Me. V flat rectangular no 2 o i t a t Energy / 1 Me. V standard yes/no 2 n Beam Halo e m Luminosity Beam Loss u r t s n Beam Polarization I Bunch Length • Energy Spread 0. 2 Me. V standard no 2 Beam Wakefield monitor Beam. Phase Halo Luminosity Beam Loss Bunch Length / <1 µm standard yes/no 2 Beam Polarization Beam Phase 0. 1 deg standard yes 2 Wakefield monitor Beam Halo Beam Loss Luminosity Beam Polarization 4 Beam Phase Beam Halo Wakefield monitor Luminosity Beam Polarization Beam Phase Wakefield monitor Luminosity Beam Polarization 2 Wakefield monitor Luminosity Wakefield monitor Machine protection Machine Item ? protection Item ? Machine protection Item ?

CLIC 08 CLIC Linac : Module DRIVE BEAM (100 A) 4 PETS, 2 quadrupoles with BPM Each PETS powers 2 acc. structures MAIN BEAM (1 A) 8 acc. structures Main beam filling factor: 91% Modules: x 16547 Accelerating structures: x 143136 PETS: x 71568

CLIC Main Beam Linac CLIC 08 Instrument Accuracy Resolution Intensity 0. 1% Position 5 mm 50 nm Beam Size / Emittance 10% 2% Energy 0. 10% Non. Machine Beam tube How Used in RT Bandwidth Stability intercepting protection aperture many? Feedback? device? Item ? 4 mm 100 MHz 4 mm 48 100 nm 4176 yes 48 Energy Spread Bunch Length Beam Loss Beam Halo Beam Phase 0. 1 degree 2 2% 2 <5 um 142812 Beam Polarization Luminosity Wakefield monitor 5 um Dark current from accelerating structure must be taken into account in the design of the intensity and position monitors yes

CLIC Drive Beam Decelerator CLIC 08 Instrument Accuracy Intensity 0. 1% Position 10 mm Beam Size / Emittance 50 mm Resolution Non. Machine Beam tube How Used in RT Bandwidth Stability intercepting protection aperture many? Feedback? device? Item ? 23 mm 100 MHz 96 41480 576 Energy 12 GHz 96 Energy Spread 100 MHz 96 Bunch Length Beam Loss 1% (30 fs) 96 in I and x, y, z ? if necessary Beam Halo Beam Phase Beam Polarization tudied s d n a d ie if c e spe need to b m e t s y s g in r onito Wakefield monitor • Beam loss m aously n e lt u im s s m both bea m o r f s e s s lo • Identify the Luminosity carefully

Beam Delivery System CLIC 08 Instrument Accuracy Resolution Non. Machine Beam tube How Used in RT Bandwidth Stability intercepting protection aperture many? Feedback? device? Item ? Intensity Position 50 nm Beam Size / Emittance <10% 8 Energy 0. 10% 4 variable 600 Energy Spread Bunch Length Beam Loss Beam Halo Beam Phase Beam Polarization Luminosity Wakefield monitor Monitors for the collimation system (beam losses) are not specified yet

Post Collision Line CLIC 08 Instrument Accuracy Resolution Non. Machine Beam tube How Used in RT Bandwidth Stability intercepting protection aperture many? Feedback? device? Item ? Intensity Position Beam Size / Emittance Energy ed i d u t er s or d mp n u u d l t l i i m n st nt Mon he bea g i s e t D rre n i u n C l o l i • Wa umentat r • Inst Energy Spread Bunch Length Beam Loss Beam Halo Beam Phase Beam Polarization Luminosity Wakefield monitor 20% 1% 1 GHz 1 m 5% ? 4 pulse to pulse yes

CLIC 08 CLIC RF Power Source : The Drive Beam Delay loop 2 Drive Beam Accelerator gap creation, pulse compression & frequency multiplication efficient acceleration in fully loaded linac Transverse RF Deflectors Combiner ring 4 pulse compression & frequency multiplication Combiner ring 3 pulse compression & frequency multiplication

CLIC 08 CLIC RF Power Source : The Drive Beam Accelerator Instrument Non. Beamand tube Combiner Rings Drive Beam Delay Loop Accuracy Resolution Bandwidth Stability intercepting Instrument Intensity Accuracy 0. 1% aperture device? Non. Beam tube Drive Beam Long Transfer Line Resolution Bandwidth Stability intercepting 1 E-05 40 mm 3 E-05 aperture device? Non. Beam tube 20 mm 100 MHz Resolution Bandwidth Stability intercepting 1 E-05 100/40 mm 3 E-05 aperture device? 20 mm 100 MHz 200 mm 1 E-05 3 E-05 How many? How 5 many? How 330 10 many? 5 100 48 5 6 848 5 3 4 3 Machine Used in RT protection Feedback? Item ? Position 20 mm Instrument Accuracy Intensity 0. 1% Beam Size / Emittance 50 mm Position 20 mm Intensity 1% Energy Beam Size / Emittance 50 mm Position 200 mm Energy Spread 0. 10% 100 MHz Energy 1 E-05 3 E-05 Beam Size / Emittance Bunch Length 0. 5 ps Energy Spread 0. 10% 100 MHz Energy Beam Loss are very similar to the CTF 3 instrumentation 6 but with Bunch Length Requirements 0. 5 ps Energy Spread Beam Halo additional limitation due to the higher bunch charge (x 100) Beam Loss Bunch Length Beam Phase • Cover a very high dynamic range (105) from commissioning to Beam Halo Beam Loss Beam Polarization production beams Beam Phase Beam Halo Luminosity Beam Polarization Beam Phase Wakefield monitor • Develop non intercepting devices Luminosity Beam Polarization Wakefield monitor Luminosity Wakefield monitor

Drive Beam Turn Around CLIC 08 Instrument Accuracy Intensity Resolution 1. 00 E-05 Position 20 mm Beam Size / Emittance 50 mm 20 mm Stability variable 3. 00 E-05 100 MHz Non. Machine How Used in RT intercepting protection many? Feedback? device? Item ? 1920 192 Energy 1. 00 E-05 Energy Spread 0. 1% Bunch Length Bandwidth Beam tube aperture 0. 5 ps 3. 00 E-05 100 MHz 96 96 192 Beam Loss Beam Halo Beam Phase 0. 1 degree 96 Beam Polarization Luminosity Wakefield monitor • Drive beam energy jitter at final compressor DE/E = 3 · 10− 5 • 10 fs Phase error of drive beam RF to generate energy spread for compressor • Drive beam current stability to achieve energy stability for one specific layout DI/I 3· 10− 5

CLIC 08 CLIC 3 Te. V – Numbers of devices Instrument Intensity Position Beam Size / Emittance/Energy spread Energy Spread Bunch Length Beam Loss Beam Halo Beam Phase How many? 356 45008 784 205 302 0 0 96 Instrument Intensity Position Beam Size / Emittance/Energy spread Energy Spread Bunch Length Beam Loss Beam Halo Beam Phase Beam Polarization Luminosity Wakefield monitor How many? 205 7278 203 73 20 10 1 0 52 8 6 142812 Drive Beam 46956 devices Main Beam 150668 devices

Beam instrumentation @ CLIC 3 Te. V CLIC 08 Drive beam accelerator delay CR 2 loop CR 1 delay loop CR 2 CR 1 BC 2 IP 1 e- main linac e+ main linac Who does What and Where ? Requirements for beam diagnostics Booster linac Classical Conditions already achieved ~ Similar to ILC or Light source at ATF – KEK, SLAC, Desy, Jlab … Under development @ CTF 3 collaboration, FP 6, FP 7 BC 1 e- injector e+ injector, e. DR e+ DR

CLIC 08 Conclusion (1) • Tables need to be discussed ! (first draft) • Commissioning beam versus Production beam : • for the Main beam: Single bunch to multi bunch mode • for the Drive beam: Need to have instruments with a very high dynamic range, may be not covered by only one device • ~ 200000 Instruments distributed along ~ 190 kms • All (or most of) instruments mentioned here are mandatory for Machine performance optimization

CLIC 08 Conclusion (2) Feasibility issues: - Need to study the Machine Protection System for both the Drive and Main beams and to develop a Beam loss monitoring system along the CLIC linac (both beams) - Very tight requirements for measuring micrometer beam size, 40 -75 microns short bunch length and beam position with a 50 nm resolution, (achievable in principle) - Reliability and availability of roughly 5000 high resolution (50 nm) BPMs and 150000 wake field monitors with 5 mm resolution - Impact on feasibility : Does the tuning procedure require all instruments to work simultaneously ? - Industrial series production : study the Impact on cost - Beam synchronization implies a 0. 1 deg at 12 GHz phase measurement with an adequate feed-forward system and a stability of the Drive Beam energy and intensity of 3. 10 -5

CLIC 08 Thanks for your attention

CLIC 08 Drive Beam Parameters Generation Complex Decelerator (24 units) Electrons energy 2. 38 Ge. V 2. 38 0. 238 Ge. V Beam current /charge 4. 2 A / 587 m. C 101 A / 24. 4 m. C Total Beam Energy 1. 397 MJ 58 5. 8 k. J Bunch length 6 -13 ps 3. 3 ps Minimum beam size 50 mm Charge density 2. 3 1010 n. C/cm 2 109 n. C/cm 2 The thermal limit for ‘best’ material (C, Be, Si. C) is ~ 1 106 n. C/cm 2 • Control of beam loss to prevent beam induced damage (10 -4) • Use of non-intercepting / non degradable beam diagnostic This is just the RF source !!! • Guarantee the efficient production of 12 GHz RF power • With a high level of reliability and availability

Instrumentation Working Group CLIC workshop 08 CLIC 08 Comparison of different BDS systems. Energy bandwidth is defined as energy offset required to double beamsize R. Tomás

CLIC 08 CLIC 3 Te. V The small beam size challenge Adapded from S. Chattopadhyay, K. Yokoya, Proc. Nanobeam `02

CLIC-ILC CLIC 08 CLIC ILC Center of mass energy (Ge. V) 3000 500 Main Linac RF Frequency (GHz) 12 1. 3 Luminosity (1034 cm-2 s-1) 5. 9 2 Linac repetition rate (Hz) 50 5 Accelerating gradient (MV/m) 100 28 Proposed site length (km) 47. 9 31 Total site AC power (MW) 322 230 Wall plug to main beam power efficiency (%) 8. 7 9. 4 Most Critical Beam Parameter http: //clic-study. web. cern. ch/CLIC-Study/ CLIC ILC Bunch Length in the Linac (fs) 150 900 Typical Beam Size in the Linac ( mm) 1 5 Beam size at IP : sx / sy (nm) 40/1 550/5 http: //www. linearcollider. org/cms/