1. PHIL: A TEST BEAMLINE AT LAL Specifications of PHIL
R. Roux, M. Bernard, G. Bienvenu, S. Cavalier, M. Joré, B. Leblond, B. Mercier, B. Mouton, C. Prevost, A. Variola
LAL, bâtiment 200, Université Paris-Sud, Orsay, France
SERA
PHIN
GOAL: construction of a small accelerator at LAL, E < 10 MeV, Q < 3 nC, single bunch, frep = 10 Hz
MOTIVATION:
test accelerating structures, especially RF guns
applications such as interaction with a laser, calibration of diagnostics etc
training for young scientists
Specifications of PHIL
BEAMLINE
Phase 0
Phase 1
Energy (MeV) 6 10
Charge (nC)
0.1 3
rms bunch length (ps) 4
rms energy spread (%)
0.3
< 2 %
Normalized rms
emittance (pmmmrad)
 1
< 20
Phase 1 (after 2009): photo-cathode preparation chamber, booster
diagnostics (Cerenkov, screens and CCD camera, emittance)
=>delayed because of a lack of funds
spent in supplementary radiation shielding
Main Components
RF gun
Laser
PHIN* gun: European contract to provide
one gun for the CTF3 drive beam linac => brazing failure
a twin for PHIL => sent to CERN
Bought to HighQ company
Provisory solution: ALPHAX RF gun
2 issues built by LAL for the Strathclyde University (UK)
(nm)
W (µJ)
Dt (ps)
Frep (Hz) 5 (100)
2.6 cells at 3 GHz
symmetric coupling (b = 1)
with a co-axial “doorknob” antenna
elliptic irises
2.6 cells at 3 GHz
symmetric coupling (b = 3)
elliptic irises
NEG pumping through the gun walls
Diagnostics
Magnets
2 WCM with 4 electrodes: beam positions (X, Y) and charge
2 Faraday cup in the 2 ways after the dipole: charge
 One couple of coils around the gun, Bz max = 0.33 T and one coil in the middle of the beamline Bz max = 0.5 T
 2 H&V steerers
 A dipole retrieved from the old injector of TTF (60°, r = 0.7 m) for energy measurement
Beam dynamic simulation
Code: PARMELA
modified by B. Mouton
E  6 MeV
e = 4 pµmrad
sz = 2.6 ps
Parameters:
Q = 0.1 nC
Laser, sr = 1.4 mm, 10 ps
PHIN gun, 85 MV/m
5000 macro-particles
Status of the Project
RF gun and RF network installed
Laser and Control room ready
Low level RF ready
Modulator-Klystron to be tested
cabling in progress
vacuum chambers
laser transport line
End of installation, July 2008
Authorization of Radiation Safety Authorities
End of June 2008
Commissioning in Fall 2009
* We acknowledge the support of the European Community-Research Infrastructure Activity under the FP6 “Structuring the European Research Area” programme (CARE, contract number RII3-CT ).