Transcript Probe beam status and schedule

Probe beam status and schedule
choice of architecture :
• 1 photo-injector
• 3 LIL sections: 1 for compression and 2 for acceleration
• 1 beamline with diagnostics (leading to 2-beam teststand)
K
steerer
position monitor
RF pulse compression
Laser
profile monitor
2 x 45 MW
10
20
25
beam dump
25
quadrupoles
rf gun cavity
15 MV/m
17 MV/m
17 MV/m
compression
acceleration
acceleration
focusing coils
LIL sections
RF deflector
spect. magnet
CALIFES
CTF3-CLEX meeting June 12, 2006
page 1
RF gun status
R. Roux
July, 7th 2006
1. Drawings, overview
2. What is under way?
3. Open questions, ask for info
4. Problems, risks
CTF3-CLEX meeting June 12, 2006
page 2
1. Overview
1. Studies finished
2. Drawings finished
3. List of components:
- gun with a measurement loop
- 2 tapered waveguides
- 2 LIL flanges
- 2 solenoids
- 1 steerer
- vacuum chamber (tubes, valve, bellow)
- 2 gauges
- 1 ionic pump
- 1 pneumatic valve
- 1 translation trolley for the preparation
chamber (additional request from CERN)
- NEG coating on the vacuum chamber
(agreed with CERN people)
RF input
photocathode
solenoids
CTF3-CLEX meeting June 12, 2006
steerer
vacuum pump
valve
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2. What’s under way?
• Gun: new supplier, the coupler cell should arrive between 17th-21th July
if everything OK, order the rest of the gun, all pieces in September
then, RF measurements, mechanical adjustments and brazing at LAL
(thanks to Eric Chevallay for the 316LN stainless steel, we will soon refunded)
• Magnetism: coils and steerer are ordered, should arrive in the beginning of September
power supplies will be bought by CERN (offer of R. Losito)
• Vacuum: gauges and valve are received, ionic pump at the end of July
power supply will be bought by CERN (offer of R. Losito)
• Mechanics: vacuum chamber and supports are under construction in LAL workshop
it should be finished in September but risks of overlap with PHIN gun
machining  PHIN gun has the priority !
CTF3-CLEX meeting June 12, 2006
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3. Open questions, ask for info
• Girder: if we can reuse the LIL 2300 mm girder, we need the drawings
open question: RF gun assembly on girder at LAL or at CERN ?
• Cabling: Who does the cabling between the photo-injector and the racks?
-cables for solenoids and steerer (electric and cooling)
-cable for RF loop
-cables for gauges and power supply
-on which side of the linac set the connectors of the solenoids?
• Possible overlap between the solenoid connectors and RF network pumps?
(happened on PHIN, solenoids sent back to the supplier to modify connectors)
• Cooling: tuning cooling loop from frozen water (20°C)
the gun will be mechanically deformed in such a way that
the right tuning frequency achieved at  30°C
CTF3-CLEX meeting June 12, 2006
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3. Problems, risks
- New supplier for the gun, if not good  delay
- Money: 70 k€ received this year
not enough to order the power supplies and gun cooling loop
I hope to get the totality of the required budget next year in March
But up to now,
RF gun construction proceeds well
CTF3-CLEX meeting June 12, 2006
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Laser system
Signal taken from the Drive Beam Laser
2 main distinct tasks:
1. extraction & manipulation of laser beam (windowing, x4 frequency
multiplication, doubling of the pulse frequency 1.5  3 GHz)
2. transport of the laser beam over 80 m as far as the photo-cathode
Subcontractor : LILM (Laser Matter Interaction Lab) from CEA-Saclay
Study of the 2 tasks till the end of 2006
mechanical design and realization follow-up by Dapnia
Pb : delay of the DB laser  1st tests with real laser will be very late
CTF3-CLEX meeting June 12, 2006
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Time-schedule
CTF3-CLEX meeting June 12, 2006
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Beam dynamics
calculations nearly complete ...
single bunch is fine
multibunch operation
due to beam-loading, bunch
charge should be linearly reduced
to meet energy & phase
requirements (1% and 1deg)
Qb < 5nC/N
still to be done:
• effect of laser spot misalignment
• estimation of the emittance
measurement accuracy
CTF3-CLEX meeting June 12, 2006
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Time-schedule
CTF3-CLEX meeting June 12, 2006
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Califes Drawings
Drawings nearly complete ...
CTF3-CLEX meeting June 12, 2006
page 11
Injection beamline
BPM
screen
vacuum
pump
LIL section
input
laser table
laser beam
injector
(LAL Orsay)
CTF3-CLEX meeting June 12, 2006
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inter-section
steerer
BPM
CTF3-CLEX meeting June 12, 2006
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diagnostics beamline
total length (cathode plane to output valve) = 21.316 m
screen
RF deflector
QL3 Triplet
vac. pump
CTF3-CLEX meeting June 12, 2006
Dipole
Dump
page 14
RF system
klystron, RF pulse compression, RF network : supplied by CERN
Modulator : includes
•
•
•
•
•
•
•
•
a high voltage pulsed power supply with negative polarity
three electromagnet power supplies
a filament heater power supply
an ion pump power supply
a hydraulic network
a X-ray shielding
a control-command system
some racks containing the materiel
offers from vendors received on 1st of July
realization time 12-14 months
vendor choice at end of July
CTF3-CLEX meeting June 12, 2006
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RF network
defined in March 2006
Klystron TH 2132
43 MW
SF6
CO
W
BOC Cavity (Pulse compression gain = 2,1)
86,4 MW
1 power phase-shifter
has to be developed
Suppose 25 m waveguide, 8 flanges pairs
76,3 MW
26,5 MW
(fine tuning of the
compression section)
27,08 MW
4.5 dB
Splitter
CO
W
P
3 dB
Splitter
4.5 dB
Splitter
9,4 MW
17.1 MW
24.65 MW
C
c
A
SF6
W
P
Phase adjustment by
length of waveguides
22 MW
=0°
CO
=0°
CO
15 MW
P
24.65 MW
P
 = 90°
CO
RF gun cavity
0.5° precision
0.5° stability
± 20 ° tuning
P
P

7 MW
49,2 MW
CO
24.1 MW
CO+L
15 MV/m
Compression
CTF3-CLEX meeting June 12, 2006
P
17 MV/m
Acceleration
21.55 MW
CO+L
CO+L
P
17 MV/m
Acceleration
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Phase-shifter
3 GHz scaling from a SLAC model at 11.4 GHz by Alexej Grudiev
sliding circular guide + mode converter
tolerances and mechanical study
made at Saclay
fabrication will start end of september
power tests at CERN
CTF3-CLEX meeting June 12, 2006
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Time-schedule
CTF3-CLEX meeting June 12, 2006
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Vacuum
Vacuum system defined
primary
pumping group
RF Gun
2 LIL sections tested under vacuum at Cern
Vacuum adaptation
and laser miror
IZ 270
Accelerating
LIL section
Compression
LIL section
IZ 120
IZ 120
Sector 1
IZ 120
IZ 120
Accelerating
LIL section
IZ 120
Sector 2
Diagnostic line
IZ 120
IZ 270
Sector 3
• 3 valves
• 6 ion pumps for LIL sections
• 2 ion pumps for input and output beamlines
hardware provided
by CERN
• power supplies, gauges
CTF3-CLEX meeting June 12, 2006
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Magnets
QL3
BHZ36
steerer H+V
solenoids
earth field
correction
quadrupoles
dipole
5
2 x 17
3x2
3
1
order before
August
CERN
provision
CERN
provision
call for tender (5)
before August
CERN
provision
delivery Nov
2006
-
-
delivery May
2007
-
CTF3-CLEX meeting June 12, 2006
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Power supplies requirements
quadrupoles quadrupoles quadrupoles
accélération
compression
accélération
RF gun
dipole
H
H V
steerer
H V
H V
steerer steerer
solénoïde
H
V
H V
steerer
V
steerer
steerer
solénoïde
# of power
supplies
type
Intensity (A)
Voltage (V)
Steerers
12
Bipolar
± 10
±5
Solenoids
2
Unipolar
120
20
Quadrupoles
3
Unipolar
200
10
Dipole
1
Unipolar with
degauss capability
100
20
Earth field
compensation
2
Unipolar
5
3
Specifications of Power supplies have been done and conveyed to CERN
CTF3-CLEX meeting June 12, 2006
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Time-schedule
CTF3-CLEX meeting June 12, 2006
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Diagnostics
Measure
Current
Position
Profile
Emittance
Central
energy
Energy
spread
Bunchlength
Requirements
Resolution ≤ 1%
Single shot, non
Precision ≤ 3%
destructive
Bandwidth > 250 MHz
Resolution ≤ 20µm
Range ±10 mm
Precision ±100µm
Single shot, non
Bandwidth >50 MHz
destructive
Resolution ≤ 20µm
Range 10x10mm
Error < 20%
chosen solutions
BPM (after calibration)
Resolution DP/P ≤1 % Single shot
Precision ≤ 2%
Bandwidth >250 MHz
15° bending magnet + BPM
Time resolution is
desirable
Resolution DP/P≤0.5%
Resolution
≤0.5ps rms
Variation of bunch
length along the
train
BPM
Screen + CCD camera
Screen + CCD camera
Quad scan + Screen + CCD camera
15° bending magnet + Screen + CCD
camera; possible future ...
Streak Camera, segmented
photomultiplier, segmented beam
dump … for time resolution
Deflecting cavity + Screen + CCD
camera; possible future ...
RF pick-up (30-174 GHz) during
operations
CTF3-CLEX meeting June 12, 2006
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BPM
Specifications : single bunch & multi-bunch operation (1-64 @ 3 GHz) 0.5 nC
• coaxial reentrant cavity, original design from R. Bossard (CERN)
• proposed and developed for TTF (M. Luong, C. Simon - DAPNIA)
PTFE
Al2O3
SMA
receptacle
CF40 rotating connector
and flange to be welded
prototype for technology validation : OK
pre-serie (2 units) : under fabrication
CTF3-CLEX meeting June 12, 2006
page 24
Beam profile monitors
3 profiler systems to different locations:
injector output, behind the triplet, behind the dipole
2 main sub-systems:
1. the vacuum tank with devices (screen, actuator, viewport, lighting)
2. the optics system (lenses, CCD camera, filter wheel, shielding…)
Tank study has started ...
Screen holder
Insertion mecanism
CTF3-CLEX meeting June 12, 2006
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Optics system
TTF2
CTF3
SOLEIL
optics design (various magnifications) + CCD camera (with Cern MTV interface)
 examples of optics design with different levels of integration
Califes : will start next September
CTF3-CLEX meeting June 12, 2006
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Time-schedule
CTF3-CLEX meeting June 12, 2006
page 27
Beam Dump
Graphite
Lead
500
Polyéthylène
Beam
Derived from SOLEIL
(100 MeV, 0.5 to 8 nC, 3 Hz)
Adaptation for CALIFES in progress
(200 MeV, 1.5 A, 21 ns, 5 Hz)
CTF3-CLEX meeting June 12, 2006
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CLEX building
CALIFES should fit into CLEX building ...
41.6 m
22 m
the last dipole could include 3 branches:
•
•
straight to 2-beam teststand
15° to Beam Dump
•
30° to Instrumentation Test Beam
CTF3-CLEX meeting June 12, 2006
page 29
Time-schedule
CTF3-CLEX meeting June 12, 2006
page 30
Questions List
Can we have a closed area for Califes ?
Which girders can we re-use from CERN ?
Who does the cabling between the Califes components and the racks ?
Alignment: studied by Michel Fontaine from Dapnia
who is the CERN contact person ?
CTF3-CLEX meeting June 12, 2006
page 31
Cooling needs
Flow (l/mn) Power (kW)
Stabilised water (30°)
LIL sections
deflecting section
rf gun
waveguides
Units
Flow
Power
10
0.5
3
1
1
1
30
0
0
0
1.5
0
0
0
Demineralised water (18-22°)
sections solenoids
120
quadrupoles
2
dipole M45
7
klystron collector & body
50
klystron foc
20
modulator
20
rf gun solenoids
5
60
2
8
5
5
10
2
2
3
1
2
2
2
2
0
240
6
7
100
40
40
10
0
120
6
8
10
10
20
4
473
179.5
Total
CTF3-CLEX meeting June 12, 2006
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