Diapositive 1

1
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)

January 2006
C A L I F E S
2
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

3
1. Overview

• Studies finished
• Drawings finished
• 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
steerer
valve
solenoids
vacuum pump
4
2. Whats 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 !

5
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
  (20C)
• the gun will be mechanically deformed in such a
  way that
• the right tuning frequency achieved at ? 30C

6
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
7
Laser system

• Signal taken from the Drive Beam Laser
• 2 main distinct tasks
• extraction manipulation of laser beam
  (windowing, x4 frequency multiplication, doubling
  of the pulse frequency 1.5 ? 3 GHz)
• 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

8
Time-schedule
9
Beam dynamics
calculations nearly complete ...

• single bunch is fine
• multibunch operationdue to beam-loading, bunch
  charge should be linearly reduced to meet energy
  phase requirements (1 and 1deg)Qb lt 5nC/N
• still to be done
• effect of laser spot misalignment
• estimation of the emittance measurement accuracy

10
Time-schedule
11
Califes Drawings
Drawings nearly complete ...
12
Injection beamline
BPM
screen
LIL section input
vacuum pump
laser table
laser beam
injector (LAL Orsay)
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inter-section
steerer
BPM
14
diagnostics beamline
total length (cathode plane to output valve)
21.316 m
screen
RF deflector
QL3 Triplet
Dipole
Dump
vac. pump
15
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
16
RF network
defined in March 2006
1 power phase-shifter has to be developed (fine
tuning of thecompression section)
17
Phase-shifter
3 GHz scaling from a SLAC model at 11.4 GHz by
Alexej Grudiev sliding circular guide mode
converter
tolerances and mechanical studymade at
Saclay fabrication will start end of
september power tests at CERN
18
Time-schedule
19
Vacuum
Vacuum system defined 2 LIL sections tested under
vacuum at Cern
primary pumping group

• 3 valves
• 6 ion pumps for LIL sections
• 2 ion pumps for input and output beamlines
• power supplies, gauges

hardware provided by CERN
20
Magnets
QL3
BHZ36
steerer HV solenoids earth field correction quadrupoles dipole
5 2 x 17 3 x 2 3 1
order before August CERN provision CERN provision call for tender (5) before August CERN provision
delivery Nov 2006 - - delivery May 2007 -
21
Power supplies requirements
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
22
Time-schedule
23
Diagnostics
Measure Requirements Requirements chosen solutions
Current Resolution 1 Precision 3 Bandwidth gt 250 MHz Single shot, non destructive BPM (after calibration)
Position Resolution 20µm Precision 100µm Bandwidth gt50 MHz Range 10 mm Single shot, non destructive BPM Screen CCD camera
Profile Resolution 20µm Range 10x10mm Screen CCD camera
Emittance Error lt 20 Quad scan Screen CCD camera
Central energy Resolution DP/P 1 Precision 2 Bandwidth gt250 MHz Single shot 15 bending magnet BPM
Energy spread Resolution DP/P0.5 Time resolution is desirable 15 bending magnet Screen CCD camera possible future ...Streak Camera, segmented photomultiplier, segmented beam dump for time resolution
Bunchlength Resolution 0.5ps rms Variation of bunch length along the train Deflecting cavity Screen CCD camera possible future ... RF pick-up (30-174 GHz) during operations
24
BPM

• Specifications single bunch multi-bunch
  operation (1-64 _at_ 3 GHz) 0.5 nC
• coaxial reentrant cavity, original design from
  R. Bossard (CERN)
• proposed and developed for TTF (M. Luong, C.
  Simon - DAPNIA)

prototype for technology validation
OK pre-serie (2 units) under fabrication
25
Beam profile monitors

• 3 profiler systems to different
  locationsinjector output, behind the triplet,
  behind the dipole
• 2 main sub-systems
• the vacuum tank with devices (screen, actuator,
  viewport, lighting)
• the optics system (lenses, CCD camera, filter
  wheel, shielding)

Tank study has started ...
Screen holder
Insertion mecanism
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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
27
Time-schedule
28
Beam Dump

• 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)

29
CLEX building
CALIFES should fit into CLEX building ...

• the last dipole could include 3 branches
• straight to 2-beam teststand
• 15 to Beam Dump
• 30 to Instrumentation Test Beam

30
Time-schedule
31
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 ?
32
Cooling needs