clic baseline changes g.geschonke
DESCRIPTION
CLIC baseline changes G.Geschonke. General and upgrade. E-Scan. E-Scan. space. fix parmeter. E-Scan. . new scheme. . fix parmeter. Drive Beam generation and distribution. cost. E-Scan. cost. fix parameter. E-Scan. E-Scan. beam dyn. resist. wall. cost. Slide. - PowerPoint PPT PresentationTRANSCRIPT
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