ACE 2.2.2010 G.Geschonke

CLIC baseline changesG.Geschonke

ACE 2.2.2010 G.Geschonke

General and upgrade

Color code: Adopted for CDR, Envisaged for CDR after additional work (responsible), Alternative to be mentioned in CDR and developped in TDR

Capability of whole complex to run at 100 Hz (70% DB current, 70 % DB energy

Capability of whole complex to run at 50 Hz (longer pulse, less charge per bunch)

Tunnel diameter 4.5 m with transverse ventilation

Longitudinal ventilation and other tunnel diameter

Angle of tunnels to 18.8 mradian Instrumentation requires full performance at ½ charge and half number of bunches

phase reference using outgoing beam as reference and/or distributed external timing

General

Machine protection: based on next pulse permit (post mortem analysis of previous pulse before enabling next pulse; “fault free” equipment for 2ms); masks for fast intra pulse losses

Maintain the 80 MV/m structures for 500 GeV also in the 3 TeV machine Length of BDS at 500 GeV

Upgrade scenario Effective crossing angle of 20 mrad at 3 TeV and 18.6 mrad at 500 GeV

E-Scan

E-Scan

new scheme

E-Scan

space

fix parmeter

fix parmeter

ACE 2.2.2010 G.Geschonke

Drive Beam generation and distribution

One single Drive Beam Generation complex at 500 GeV

DBA flexible number of bunches and lower bunch charge

DBA MB klystron with lower power (10…15 MW)

DBA klystron frequency of 1.0 GHz and multiplication frequency of 3*4 for RF = 12 GHz

DBA klystron frequency of 1.3 GHz and multiplic. frequency of 3*3 for RF = 11.7 GHz

Omega-shaped delay Loop Multiple Delay Line lengths First Combiner Ring: double circumference Turn-arounds: Twice as long Turn-arounds: beam pipe radius from 20 to 40 mm

turn-around magnets normal conducting electromagnets

permanent magnets with trim

Drive Beam

generation and

distribution

Drive Beam phase stability concept, Drive Beam Phase feed-forward concept at final turn-arounds

E-Scan

E-ScanE-Scan

Slide

cost

cost

fix parameter

beam dyn.

resist. wall

cost

ACE 2.2.2010 G.Geschonke

Single DB complex at 500 GeV

3 TeV

0.5 TeV

ACE 2.2.2010 G.Geschonke

Drrive Beam phase control

Slide from Daniel Schulte

Main Beam Injector complex

ACE 2.2.2010 G.Geschonke

Two positron targets for e+ at 500 GeV and 3 TeV

Injector linac from 2 to 1 GHz ? DR frequency from 2 to 1 GHz ? Damping Ring energy to 2.86 GeV Booster linac adopt new position Booster linac lattice from triplets to FODO Booster linac and transfer to ML at 9 GeV 8 GeV Booster linac RF frequency 1, 2 or 4 GHz New layout for RTML arcs into the tunnel Electron linac on left spin rotators for e- after DR

dogleg for positrons to tunnel transfer

Main Beam

injector complex

space reservation for e+ spin rotator

Slide

Increase e+ captureefficiency

significant beam loadingfunneling?

civ. engineeringoptimisation

beam dyncost

beam dynpolarisation

civ. engineering

ACE 2.2.2010 G.Geschonke

500 GeV to 3 TeV

CLIC evolution from 500 GeV to 3 TeV

Center-of-mass energy CLIC 500 GeV CLIC 3 TeV

Beam parameters Conservative Nominal Conservative Nominal

Accelerating structure 502 G

Total (Peak 1%) luminosity 0.9(0.6)·1034 2.3(1.4)·1034 1.5(0.73)·1034 5.9(2.0)·1034

Repetition rate (Hz) 50

Loaded accel. gradient (MV/m) 80 100

Main linac RF frequency (GHz) 12

Bunch charge (109) 6.8 3.72

Bunch separation (ns) 0.5

Beam pulse duration (ns) 177 156

Beam power/beam (MW) 4.9 14

Hor./vert. norm. emitt (10-6/10-9) 3/40 2.4/25 2.4/20 0.66/20

Hor/Vert FF focusing (mm) 10/0.4 8 / 0.1 8 / 0.3 4 / 0.07

Hor./vert. IP beam size (nm) 248 / 5.7 202 / 2.3 83 / 2.0 40 / 1.0

Hadronic events/crossing at IP 0.07 0.19 0.57 2.7

Coherent pairs at IP 10 100 5 107 3.8 108

BDS length (km) 1.87 2.75

Total site length km 13.0 48.3

Wall plug to beam transfer eff 7.5% 6.8%

Total power consumption (MW) 129.4 415

ACE 2.2.2010 G.Geschonke

Main Beam Linac

Tighter vacuum specs (10-8 to 10-9 mbar) Electromechanical quad movers for BBF Small electromagnets BPM: redundant read out MB quad stabilization by electromechanical movers

mechanical stabilisation of quads replaced by equivalent beam steering

Main Beam Linac

One wake-field monitor/acc. structure Fewer monitors

cost

reliability of BBF

cost

cost

ACE 2.2.2010 G.Geschonke

Structure assembly in disks Higher-performance, lower-cost alternatives (quadrants, …)

Sealed assembly (not tank)

Super-structure consisting of two accelerating structures

Accel. Struct

56 K ∆T Redefine acceptable ΔT On/off/ramp system based on internal upstream reflector

PETS Ramping capability for RF conditioning (intermediate power running)

MB + DB individual girders Common girders MB + DB 2m girders Longer girders

1 HOR/VER BPM per DB quad Reduce number of BPMs

One PC per DB quad Power DB quads in groups (lower number of PS)

rf diagnostic system requirements / characteristics

TBA Module

Pre-alignment system based on conv WPS/DHL sensors with snake system, articulation point & actuators

Low cost sensors Cam system movers Laser system

Accelerating structure, PETS, Module

performance

new system

new system

cost

cost

cost

to be developed

cost

ACE 2.2.2010 G.Geschonke

Machine detector interface Beam Delivery system

Tune-up dump at entrance of BDS L* = 3.8m (detector length +-6m) L* = 6 or 8 m FF quadrupole: PM tunable for small changes and replaced for larger energy variations

SC quadrupoles

FF supported by cantilever from tunnel for L* 6m or 8m FF attached to floor

maximum detector field 5T no antiDID Solenoid compensation feedforward on IP using sensors on IP quadrupoles

Fully integrate mechanical feedback and beam based feedback/feedforward

Momentum collimation before betatron collimation

Vice versa

MDI /

BDS

Intra-pulse feedback at IP

slide

Concept M.Modena

Slide

new development

fix design

new development

ACE 2.2.2010 G.Geschonke

L *

SSlide from D.Schulte

ACE 2.2.2010 G.Geschonke

IP Beam control

Slide from D. Schulte

ACE 2.2.2010 G.Geschonke

Conclusion

• Coherent approach to baseline changes

• freeze decisions for CDR end March

ACE 2.2.2010 G.Geschonke

ACE 2.2.2010 G.Geschonke