Clic machine protection
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CLIC Machine Protection. Main Beam 2 injectors e + e - 1 Linac , 2.66 GeV , 234 m ?, 2 GHz 2 Pre-damping rings 398 m NB: Synchrotron power from damping rings: 3.857 Mev turn -1 x 204 nC /1.2 ms turn -1 = 656 KW, (13 KJ pulse -1 ). 2 Damping rings 493 m (same as PDR)

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CLIC Machine Protection

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Clic machine protection

CLIC Machine Protection

Main Beam

  • 2 injectors e+ e-

  • 1 Linac, 2.66 GeV, 234 m?, 2 GHz

  • 2 Pre-damping rings 398 m

    NB: Synchrotron power from damping rings: 3.857 Mev turn-1 x 204 nC /1.2 ms turn-1 = 656 KW, (13 KJ pulse-1).

  • 2 Damping rings493 m(same as PDR)

  • 2 Bunch compressors (4 GHz RF)

  • 1 Booster linac,5.14GeV, 561m?

  • 2 Transport lines (24.2 km)

  • 2 Turn around loops

  • 2 Bunch compressors (245 m, 12 GHz RF)

  • 2 Main linacs (24.2 km 12 GHz RF from Pets)

  • 2 Beam delivery (2.75 km diagnostics, collimation, final focus)

  • 2 Post collision lines (beam dumps)

    Drive Beam

  • 2 Drive beam linac (2x326 klystrons, 139 us)

  • 2 Delay loops (2 RF kickers)

  • 2 Combiner rings 144.8 m (2 RF kickers)

  • 2 Combiner rings 434 m (2 RF kickers)

  • 2 Transport line with 24 extraction kickers

  • 2x24 Decelerator sectors, each n PETS structures and dump.


Clic basic features

QUAD

QUAD

POWER EXTRACTION

STRUCTURE

ACCELERATING

STRUCTURES

BPM

CLIC – basic features

  • High acceleration gradient

    • “Compact” collider – total length < 50 km

    • Normal conducting acceleration structures

    • High acceleration frequency (12 GHz)

  • Two-Beam Acceleration Scheme

    • High charge Drive Beam (low energy)

    • Low charge Main Beam (high collision energy)

    •  Simple tunnel, no active elements

    •  Modular, easy energy upgrade in stages

CLIC TUNNEL

CROSS-SECTION

4.5 m diameter

Drive beam - 101 A, 240 ns

from 2.4 GeV to 240 MeV

12 GHz – 140 MW

Main beam – 1 A, 156 ns

from 9 GeV to 1.5 TeV


Clic overall layout

326 klystrons33 MW, 139 ms

combiner rings Circumferences delay loop 72.4 mCR1 144.8 mCR2 434.3 m

drive beam accelerator2.38 GeV, 1.0 GHz

CR1

CR1

1 km

Delayloop

CR2

CLIC – overall layout

326 klystrons33 MW, 139 ms

drive beam accelerator2.38 GeV, 1.0 GHz

Drive Beam Generation Complex

1 km

Delayloop

CR2

klystrons will probablychange to ~10 MW

decelerator, 24 sectors of 878 m

Drive beam

BDS2.75 km

BDS2.75 km

BC2

BC2

245m

245m

IP

e+ main linac

e- main linac , 12 GHz, 100 MV/m, 21.1 km

TAR=120m

TAR=120m

48.4 km

Main beam

CLIC 3 TeV

booster linac, 9 GeV

BC1

e- injector2.86 GeV

e+ injector, 2.86 GeV

e-PDR398m

e-DR493m

Main Beam Generation Complex

e+PDR398m

e+DR493m


Clic layout for 0 5 tev

326 klystrons

33 MW, 29 ms

combiner rings

Circumferences

delay loop 80.3 m

CR1 160.6 m

CR2 481.8 m

drive beam accelerator

2.47 GeV, 1.0 GHz

CR1

CR1

1 km

delay

loop

CR2

CLIC Layout for 0.5 TeV

326 klystrons

33 MW, 29 ms

drive beam accelerator

2.47 GeV, 1.0 GHz

1 km

delay

loop

Drive Beam Generation Complex

CR2

decelerator, 5 sectorsof 878 m

BDS

1.87 km

BDS

1.87 km

BC2

BC2

245m

245m

IP1

e- main linac , 12 GHz, 80 MV/m, 4.39 km

e+ main linac

TA

R=120m

TA

R=120m

13.0 km

CLIC overall layout

0.5 TeV

booster linac,

9 GeV, 4 GHz

Main Beam Generation Complex

BC1

e- injector

2.86 GeV

e+ injector, 2.86 GeV

e+ DR

493m

e- DR

493m


Clic layout at various energies

~20 km

CLIC Layout at various energies

Linac 1

I.P.

Linac 2

0.5 TeV Stage

Injector

Complex

4 km

4 km

~13 km

1 TeV Stage

Linac 1

I.P.

Linac 2

Injector

Complex

7.0 km

7.0 km

3 TeV Stage

Linac 1

I.P.

Linac 2

Injector

Complex

21.1 km

2.75 km

2.75 km

21.1 km

48.4 km


Clic machine protection

CLIC Parameters and upgrade scenariohttp://cdsweb.cern.ch/record/1132079/files/CERN-OPEN-2008-021.pdf

4th phase: 3 TeV luminosity upgrade 3 TeV nominal parameters

2nd phase: 500 GeV luminosity upgrade 500 GeV nominal parameters

3rd phase: 0.5 to 3 TeV energy upgrade 3 TeV conservative parameters

1rst phase: Initial operation 500 GeV conservative parameters

J-P.Delahaye


Clic main parameters

CLIC main parameters


Lc comparison at 500 gev

LC comparison at 500 GeV


Clic overall layout1

326 klystrons33 MW, 139 ms

combiner rings Circumferences delay loop 72.4 mCR1 144.8 mCR2 434.3 m

drive beam accelerator2.38 GeV, 1.0 GHz

CR1

CR1

1 km

Delayloop

CR2

CLIC – overall layout

326 klystrons33 MW, 139 ms

drive beam accelerator2.38 GeV, 1.0 GHz

Drive Beam Generation Complex

1 km

Delayloop

CR2

decelerator, 24 sectors of 878 m

Drive beam

BDS

2.75 km

BDS

2.75 km

BC2

BC2

245m

245m

IP

e+ main linac

e- main linac , 12 GHz, 100 MV/m, 21.1 km

TA

R=120m

TA

R=120m

48.4 km

Main beam

CLIC 3 TeV

booster linac, 9 GeV

BC1

e- injector2.86 GeV

e+ injector, 2.86 GeV

e-PDR398m

e-DR493m

Main Beam Generation Complex

e+PDR398m

e+DR493m


Two beam acceleration

2

1

3

Two-beam acceleration

Counter propagation from central complex

Instead of using a single drive beam pulse for the whole main linac, several (NS = 24) short ones are used.

Each one feed a ~800 m long sector of TBA.

decelerator sector

main linac

main beampulse

pulse 2

pulse 1

From central complex

(DLDS-like system)

Counter-flow distribution allows to power different sectors of the main linac with different time bins of a single long electron pulse. The distance between pulses is 2 LS = 2 Lmain/NS. The initial drive beam pulse length is equal to 2 Lmain= 140 ms/c.

R.Corsini


Drive beam generation summary

CR1

Drive Beam

decelerator, 24 sectors of 876 m

2904 bunches83 ps (12 GHz)

Main Beam

240 ns

140ms, 24 trains

5.8ms

Drive beam generation summary

Drive beam structure - final

326 klystrons33 MW, 139 ms

Bunch charge: 8.4 nC, Current in train: 100 A

drive beam accelerator2.38 GeV, 1.0 GHz

1 km

240 ns

initial

240 ns

Delayloop

CR2

5.8 ms

140 ms train length - 24  24 sub-pulses

4.2 A - 2.4 GeV – 60 cm between bunches

24 pulses – 101 A – 2.5 cm between bunches


Drive beam generation basics

Drive beam generation basics

  • Efficient acceleration

  • Frequency multiplication

No RF to load

RF in

Full beam-loading acceleration in traveling wave sections

High beam

current

Most of RF power

to the beam

“short” structure - low Ohmic losses

Beam combination/separation

by transverse RF deflectors


Fully loaded operation

Fully loaded operation

  • efficient power transfer from RF to the beam needed

    “Standard” situation:

    • small beam loading

    • power at structure exit lost in load

“Efficient” situation:

high beam current

high beam loading

no power flows into load

VACC≈ 1/2 Vunloaded


Fully loaded operation1

Transient

DP/P (%)

-5 0 5

Steady state

Time resolved beam energy spectrum measurement in CTF3

100

200

300

400

Time (ns)

Fully loaded operation

  • Disadvantage: any current variation changes energy gainat full loading, 1% current variation = 1% voltage variation

  • Requires high current stability

  • Energy transient(first bunches see full field)

  • Requires continuous bunch train

E0

Ebeam

steady state

 E0 /2

tfill

t


Delay loop principle

Delay Loop Principle

double repetition frequency and current

parts of bunch train delayed in loop

RF deflector combines the bunches (fdefl=bunch rep. frequency)

Path length corresponds to beam sub-pulse length


Rf injection in combiner ring

injection line

1st turn

2nd

septum

1st deflector

2nd deflector

local

inner orbits

lo

RF deflector

field

4rd

3rd

lo/4

RF injection in combiner ring

combination factors up to 5 reachable in a ring

Cring = (n + ¼) l

Cringhas to correspond to the distance of pulses from the previous combination stage!


Lemmings drive beam

Lemmings Drive Beam

AlexandraAndersson


Drive beam time structure

Drive Beam time structure

= 3 * LCR1

= 2 * LDL

C.Biscari


Drive beam ctf3 clic

Drive Beam CTF3 - CLIC

  • Still considerable extrapolation to CLIC parameters

  • Especially total beam power (loss management, machine protection)

  • Good understanding of CTF3 and benchmarking needed


Clic power generation

326 klystrons33 MW, 139 ms

combiner rings Circumferences delay loop 72.4 mCR1 144.8 mCR2 434.3 m

drive beam accelerator2.38 GeV, 1.0 GHz

CR1

CR1

1 km

Delayloop

CR2

CLIC – power generation

326 klystrons33 MW, 139 ms

drive beam accelerator2.38 GeV, 1.0 GHz

Drive Beam Generation Complex

1 km

Delayloop

CR2

decelerator, 24 sectors of 878 m

Drive beam

BDS

2.75 km

BDS

2.75 km

BC2

BC2

245m

245m

IP

e+ main linac

e- main linac , 12 GHz, 100 MV/m, 21.1 km

TA

R=120m

TA

R=120m

48.4 km

Main beam

CLIC 3 TeV

booster linac, 9 GeV

BC1

e- injector2.86 GeV

e+ injector, 2.86 GeV

e-PDR398m

e-DR493m

Main Beam Generation Complex

e+PDR398m

e+DR493m


Power extraction structure pets

Power extraction structure PETS

  • must extract efficiently >100MW power from high current drive beam

  • passive microwave device in which bunches of the drive beam interact with the impedance of the periodically loaded waveguide and generate RF power

  • periodically corrugated structure with low impedance (big a/λ)

  • ON/OFFmechanism

The power produced by the bunched (0) beam in a constant impedance structure:

Design input parameters

PETS design

Beam eye

view

P – RF power, determined by the accelerating structure needs and the module layout.I – Drive beam currentL – Active length of the PETSFb – single bunch form factor (≈ 1)


Power extraction structure pets1

Power Extraction Structure (PETS)

PETS parameters:

  • Aperture = 23 mm

  • Period = 6.253 mm (900/cell)

  • Iris thickness = 2 mm

  • R/Q = 2258 Ω

  • V group= 0.453

  • Q = 7200

  • P/C = 13.4

  • E surf. (135 MW)= 56 MV/m

  • H surf. (135 MW) = 0.08 MA/m (ΔT max (240 ns, Cu) = 1.8 C0)

The PETS comprises eight octants separated by the damping slots. Each of the slots is equipped with HOM damping loads. This arrangement follows the need to provide strong damping of the transverse modes.

H-field

E-field

To reduce the surface field concentration in the presence of the damping slot, the special profiling of the iris was adopted.

I. Syratchev


Field development in a pets

Field development in a PETS

The induced fields travel along the PETS structure and build up resonantly (here only dipole fields in animation)

Courtesy of SLAC

and I.Syratchev


Clic two beam module layout

CLIC two-beam Module layout

Standard module

Total per module8 accelerating structures8 wakefield monitors4 PETS2 DB quadrupoles2 DB BPMTotal per linac8374 standard modules

Other modules have 2,4,6 or 8 acc.structures replaced by a quadrupole(depending on main beam optics)

Total 10462 modules, 71406 acc. structures, 35703 PETS

G.Riddone


Clic two beam module

CLIC two-beam Module

Transfer lines

Drive Beam

Main Beam

Alignment system, beam instrumentation, cooling integrated in design

G.Riddone


Clic main beam generation

326 klystrons33 MW, 139 ms

combiner rings Circumferences delay loop 72.4 mCR1 144.8 mCR2 434.3 m

drive beam accelerator2.38 GeV, 1.0 GHz

CR1

CR1

1 km

Delayloop

CR2

CLIC – main beam generation

326 klystrons33 MW, 139 ms

drive beam accelerator2.38 GeV, 1.0 GHz

Drive Beam Generation Complex

1 km

Delayloop

CR2

decelerator, 24 sectors of 878 m

Drive beam

BDS

2.75 km

BDS

2.75 km

BC2

BC2

245m

245m

IP

e+ main linac

e- main linac , 12 GHz, 100 MV/m, 21.1 km

TA

R=120m

TA

R=120m

48.4 km

Main beam

CLIC 3 TeV

booster linac, 9 GeV

BC1

e- injector2.86 GeV

e+ injector, 2.86 GeV

e-PDR398m

e-DR493m

Main Beam Generation Complex

e+PDR398m

e+DR493m


Main beam injector complex

Main beam Injector Complex

e- Main Linac

e+ Main Linac

e- BC2

e+ BC2

12 GHz

12 GHz

8 GeV

48 km

3 TeV

Base line configuration

Booster Linac

5.14 GeV

4 GHz

e+ BC1

4 GHz

e- BC1

4 GHz

2.86 GeV

e+DR

493m

2.86 GeV

e-DR

493m

e-PDR

398m

e+PDR

398m

2.86 GeV

2.86 GeV

Injector Linac

2.66 GeV

2 GHz

e-/g

Target

g/e+

Target

Pre-injector

Linac for e+

200 MeV

Laser

Primary beam

Linacfor e-

5 GeV

Pre-injector

Linac for e-

200 MeV

DC gun

Polarized e-

2 GHz

2 GHz

e- gun

AMD

2 GHz


Pdr parameters

PDRparameters

F. Antoniou, et al., 2009


Clic damping ring layout

CLIC damping ring layout

125m

39m

125m


New dr parameters 2009

New DR parameters (2009)

  • New DR increased circumference by 30% and energy by 20%

  • DA significantly increased

  • Magnet strength reduced to reasonable levels (magnet models already studied)

  • Combined function bend increases significantly vertical beta on dipoles

  • TME optics modification and energy increase reduces IBS growth factor to 2 (as compared to 5.4)

  • Ready for CDR

  • Further optimization with respect to IBS (F. Antoniou PhD thesis)


Synchrotron radiation absorption

Synchrotron radiation absorption

K. Zolotarev, et al., 2008

Regular absorbers of 26kW for PETRA-III project


Wigglers effect with ibs

BINP PM

wiggler

BINP SC

wiggler

ANKA SC

wiggler

Wigglers’ effect with IBS

  • Super-conducting magnets have to be designed, built and tested

  • Two wiggler prototypes

    • 2.5T, 5cm period, NbTi coil, built by BINP

    • 2.8T, 4cm period, Nb3Sncoil, built by CERN/ANKA

  • Aperture fixed by radiation absorption scheme

Stronger wiggler fields and shorter wavelengths necessary to reach target emittance due to strong IBS

With super-conducting wigglers, the achieved normalized horizontal emittance drops below 400nm


Beam delivery system

Beam Delivery System

  • diagnostics, emittance measurement, energy measurement, …

  • collimation, crab cavities, beam-beam feedback, beam extraction,beam dump


Collimator be survival

Collimator (Be) survival

  • Energy Collimators designed to survive a full pulse

  • Temperature raise after impact of a full train below melting level.


Post collision line

KonradElsener, CLIC meeting, 15 May 2009

Post-Collision line

CLIC conceptual design 3 TeV (20 mrad crossing angle)

A. Ferrari et al., PRSTA&B 12 021001 (2009)

stretched lattice, as proposed at ’08 CLIC - ACE

NEW !

Side View


Documentation

Documentation

  • General documentation about the CLIC study:http://cern.ch/CLIC-Study/

  • CLIC scheme description:http://preprints.cern.ch/yellowrep/2000/2000-008/p1.pdf

  • CLIC Physicshttp://clicphysics.web.cern.ch/CLICphysics/

  • CLIC Test Facility: CTF3 http://ctf3.home.cern.ch/ctf3/CTFindex.htm

  • CLIC technological challenges (CERN Academic Training)http://indico.cern.ch/conferenceDisplay.py?confId=a057972

  • CLIC Workshop 2008 (most actual information)http://cern.ch/CLIC08

  • EDMShttp://edms.cern.ch/nav/CERN-0000060014

  • CLIC ACE (advisory committee meeting)http://indico.cern.ch/conferenceDisplay.py?confId=58072

  • CLIC meeting (parameter table) http://cern.ch/clic-meeting

  • CLIC parameter notehttp://cern.ch/tecker/par2007.pdf

  • CLIC notes http://cdsweb.cern.ch/collection/CLIC%20Notes

  • CLIC PBS https://edms.cern.ch/file/918792/5/CLIC_PBS_3_TeV_CDR.xlsx

  • CDR layout (with responsibles)http://indico.cern.ch/getFile.py/access?contribId=43&resId=8&materialId=0&confId=58072


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