1. Have a chance to operate your own beam at CERN
CALIFES Beam Training
Have a chance to operate your own beam at CERN
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

2. JUAS pratical work presentation - D. Gamba, W. Farabolini
Contents
CLIC
CTF3 overview
CALIFES Probe beam accelerator
TBM Two Beam Module
Other experiments on CALIFES beam
Work Proposals
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

3. The Compact Linear Collider (CLIC) project
CLIC overall layout for ECM = 3 TeV
A possible future collider after the LHC
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

4. JUAS pratical work presentation - D. Gamba, W. Farabolini
CTF3 Facility
140 m
42 m
84 m
CTF2 - Station klystron 12 GHz
A (small) mock-up of the CLIC
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

5. CALIFES Probe beam 100 to 205 MeV Energy < 20 p mm.mrad
Photo-cathode preparation chamber
Photo-injector
3 GHz LIL section used for bunch compression
3 GHz LIL sections used for bunch acceleration
Diagnostics section
To Two Beams Test Stand
Energy
100 to 205 MeV
Norm. rms emittance
< 20 p mm.mrad
Energy spread
< ± 2 %
Bunch charge
0.6 nC to 1 pC
Bunch spacing
0.667 ns
Number of bunches
1 to 300
rms. bunch length
< 0.75 ps to 10 ps
BEAM CHARATERISTICS (not all simultaneously)
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini
CALIFES in CLEX

6. JUAS pratical work presentation - D. Gamba, W. Farabolini
Califes scheme
Beam direction
Main settings
Laser: Intensity, number of pulses, timing vs. RF pulse
RF: Klystron power, compression law, klystron phase, gun phase, buncher phase
Gun: Solenoids, laser position on the photocathode
Beam transport: Corrector magnets, solenoids
Beam parameters: Quadrupole magnets
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

7. JUAS pratical work presentation - D. Gamba, W. Farabolini
The Two Beam Test stand
CALIFES Probe Beam
Drive Beam
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

8. JUAS pratical work presentation - D. Gamba, W. Farabolini
The CLIC module
2 PETS
2 Quads
2 Stripline BPMs DB PB
2 superstructures (4 ACSs)
2 WFMs
Beam loss monitors
Water flow control
SiC girders
Sensors and actuators for active alignment
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

9. CLIC 100 MV/m accelerating structures
42 MW, 12 GHz, 140 ns RF pulse
100 MV/m
2 structures of 24 cm assembled together
3.6 MV/m in the air
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

10. Drive and probe beam inside CLEX
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

11. Beam for diagnostics test
Electro Optical Method for bunch length measurement
PhD Thesis of R. Pan
Diamond beam loss detectors
BPM cavité haute résolution (<1 mm)
F. Burkart, O. Stein,
E. Nebot Del Busto
F. Cullingam J. Towler
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

12. JUAS pratical work presentation - D. Gamba, W. Farabolini
Experiment proposals
gun with dark current only (field emission):
Optimize dark current extraction using profile monitor.
Transport of the dark current through the accelerating structures.
Energy, charge and Twiss parameters measurement.
Preparation of a large beam for the irradiation test stand.
RF power in the accelerating structure, measure of the filling time, observation of the beam loading at the output port.
Charge measure vs. phase scan of the gun, photo-cathode quantum efficiency measurement
Energy measure at the gun output using corrector,
Observation of the gun beam loading on the gun E field antenna.
Transport of the beam, phase to inject the bunches in the structures, alignment using the BPMs
Alignment of the beam in the quadrupole observing the kick
Energy measure in the spectrometer line
Emittance measurement using the quad scan method
Use of a simple model to optimise the beam transport, test of focusing on various screens
Measures in Two Beam Module: Beam losses detection, wakefield RF power generation, WFM signals
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

13. JUAS pratical work presentation - D. Gamba, W. Farabolini
Controls panels
CALIFES controls via Matlab
Standard controls at CERN
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

14. JUAS pratical work presentation - D. Gamba, W. Farabolini
Dark Current
200 ns
Large dark current beam on irradiation test bench
Dark current and laser generated beam separated
Dark current time profile
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

15. JUAS pratical work presentation - D. Gamba, W. Farabolini
Beam loading
E field in the gun
Accelerating structure input and output power
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

16. Alignment of the beam inside quadrupoles
Quads Off
Horizontal focusing quad on
Beam offset in both axis
Vertical focusing quad on
Horizontal beam offset
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

17. JUAS pratical work presentation - D. Gamba, W. Farabolini
Quadrupole scan
Screen
quadrupole
Drift
Horizontal beam size as function of quadrupole current
Vertical beam size as function of quadrupole current
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

18. JUAS pratical work presentation - D. Gamba, W. Farabolini
Transport model
Use the previously computed Twiss parameters to optimize the beam downstream with quadrupoles
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini

19. JUAS pratical work presentation - D. Gamba, W. Farabolini
Strange beam contest
1, 2, 3… bunches with transverse space separation
3 bunches of various charge and emittance
You are very welcomed to participate
Fishy beam
Valentine’s day beam
Beam size 37 x 33 mm
Octupolar fields beam shape
15/02/2016
JUAS pratical work presentation - D. Gamba, W. Farabolini