Table 4.1
Progress from LC Test Facilities (December 1995) |
Facility | Constr. Start |
Constr. Complete |
Tested or to be Tested During Construction |
Accomplished or to be Accomplished During Operation |
Still to be Done |
Other Things to do/ Limitations |
SLAC | ||||||
FFTB | 1989 | 1993 | Alignment
Stabilization (mechanical and thermal) Spot monitors BPM's |
Injected beam with
Spot demagnified by 320 to 70 nm Chromatic properties verified Instrumentation and tuning Beam-based alignment developed E144 nonlinear QED observed |
Finish systematic alignment and beam studies
Nanometer RF-BPM's |
|
ASTA/Test Lab | 1992 | on-going | 50MW klystrons
SLED II |
1.8 m detuned structure tested to 67 MV/m
SLED II tested to 205 MW output |
50 MW PPM focused klystron
SLED II tested to higher power |
75 MW klystron to be developed |
ASSET at SLC | 1994 | 1997 | 1.8 m detuned structure wakefields verified | 1.8 m damped/detuned structure wakefields to be measured | ||
NLCTA | 1993 | 1997 | Overall assembly of rf system | Not yet started | Injector commissioning
Beam loading compensation Beam breakup tests Transverse rf field tests |
Two-klystron modulator tests
Injector upgrade Blumlein modulator Construction of instruments |
KEK | ||||||
ATF
1.54 GeV Linac & DR |
1992 | 1996 | Multibunch generation
(20, 2 , 2.8 ns spacing) 33 MV/m with S-band Dual-iris SLED-I S-band choke mode structure Bunch-to-bunch instrumentation Polarized electron gun |
Linac loading compensation by
-frequency
Beam-based tuning in linac and DR Damping by wigglers Double kicker extraction Waveguide-damped rf cavity Multibunch beam dynamics (no. of bunches no. of trains = 10 5 to 60 2) One-stage compressor Positron source test |
Final focus test
Polarized rf gun Polarized positron source |
X-band technologies
90-bunch trains 1.4 ns spacing Full energy positron production |
BINP | ||||||
VLEPP
400 MeV |
1992 | 1997 | 60 MW klystron
1 MV DC voltage system VPM (rf pulse comprsn.) 1 m structures 5 m submodule of VLEPP |
High power test of structure
High power test of VPM Alignment Super-precise BPM's Micromovers |
120 MW gridded-gun klystrons with PPM focusing
Feedback system |
X-band technology
Single bunch dynamics Cost estimates |
CERN-CLIC | ||||||
CTF1 | 1989 | 1995 | RF gun photocathode
Laser system Short bunch measurement, 30 GHz accel. structures |
Demonstration of two-beam principle
Generation of 35 nC/b, 76 MW 30 GHz power No 30 GHZ breakdown up to E = 125 MeV/m, (E) = 94 MeV/m in CLIC acc. section Testing 33 GHz BPM & 30 GHz transfer section |
Beam loading compensation
Bunch compression with trains, obtain 30 nC with = 2 ps |
|
CTF2 | 1996 | 1999 | New 2.5 cell RF gun
3 GHz accelerating sections adapted to high charges |
Not yet started | Beam loading compensation with trains
Bunch compression 1 C (48 bunches) 30 GHz reaccel. to 320 MeV Active alignment system Wakefield studies |
|
CESTA | 1993 | 1997 | Generation of bunched beam (1 cm spacing) | |||
DESY | ||||||
SBLC
Test Facility 400 MeV |
1992 | 1996 | Modulator I tested
150 MW klystrons I & II tested 6m sections with HOM ROBAX-ceramic support Injector design BPM's |
Appropriate bunched beam generated with compression to 250 ps
Quadrupole vibration feedback successful, with 12 dB attenuation between 1-20 Hz |
Beam dynamics of single and multibunch
(125) trains with 8, 16, 24 ns spacing (300mA) |
Machine too short to study complete effects, filamentation, etc.
Need RF pulse shaping to correct beam loading |
TESLA
Test Facility 500 MeV |
1993 | 1997 |
Processing steps Fabrication methods Lorentz force control Cryogenics, RF power Injector design |
Not yet started | RF/Energy control
Cryo heat leak, static, fundamental, HOM Alignment stability Vibration, microphonics High-charge injection Long transv. wakes, single bunch, multibunch Cavity misalignment Cryo procedures warm up / cool down In-situ HPP Dark current, beam losses and radiation |
Refine cost estimates of alternate designs for cavity fabrication
High-efficiency klystron SMES Modulator TESLA design Overall cost estimates |
LBNL | ||||||
RTA | 1995 | 2002 | Not yet started | Cost and efficiency issues in drive-beam generation
Beam transport and BBU limits RF production and stability |
Performance and efficiency of an extended system | |
Facility | Constr. Start |
Constr. Complete |
Tested or to be Tested During Construction |
Accomplished or to be Accomplished During Operation |
Still to be Done |
Other Things to do/ Limitations |
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This page modifed: March 31, 1997 - 1 p.m. PST - elm