1. A summary of world-wide test beam facilities
Erik J. Ramberg
FNAL
4 Sept. 2004

2. A list of available facilities with multi-GeV beam
FNAL - m, p, p: GeV: available 2004-on
SLAC - e, g, p: 1-30 GeV: available 2004-on
DESY – e: 1-7 GeV: available
CERN – e, p, p: (PS) 1-15 GeV: (SPS) GeV: likely available 2006-on
IHEP (Protvino, Russia) – e, m, p, p: 1-45 GeV: available
See “Report on WorldWide Linear Collider Test Beam Effort”:

3. FNAL
2 beam enclosures. Eventually, downstream enclosure will be operated independently of upstream.
6 user stations, with a 7th downstream of the beam dump. An experiment can take up more than one station.
2 climate stabilized huts with air conditioning.
2 separate control rooms.
Outside gas shed + inside gas delivery system can bring any 2 gases (and exhaust lines) to any of the user areas
Lockable work area for small scale staging or repairs.

4. MTBF Operational Characteristics
Resonant extraction from Main Injector delivers 120 GeV beam over 0.6 sec spill. Minimum of 1 spill/minute. Depending on program, can deliver up to 10 spills/minute
There are several operational modes:
Proton Mode: Tune beamline for 120 GeV protons that get transmitted through the target. Maximum rates so far are 200 KHz.
Secondary, or ‘Pion’ Mode: Vary the tune of the beamline according to the momentum desired. Maximum momentum is currently 66 GeV, with rates on the order of 10 kHz. Lowest momentum tune is on the order of 3-5 GeV. (See graph of calculated rates on web site)
Muons: Muon fraction at 33 GeV tune is on the order of %. Two intermediate beam stops exist to reduce rate of hadrons.
Electrons: At low momentum (< 10 GeV), the beamline delivers an enhanced primary electron fraction, at very low rates.
Spot sizes can be made as small as 3-5 mm square (with 120 GeV protons) and as large as 5 cm square.

5. Particle Species in MTBF
We have looked at response of beamline Cerenkovs for 8, 16, 33, 66, 120 GeV tunes
At 16 GeV, it is easy to get ~100 muons/spill
Have seen Cerenkov signals below muon threshold, but haven’t verified presence of electrons.
66 GeV
16 GeV
Scint.
CC1
CC2
p+ threshold
p threshold
m+ threshold
p+ threshold

6. SLAC ESA, NLC-500, and TESLA-500
Beam Parameters at
SLAC ESA, NLC-500, and TESLA-500
Parameter
SLAC ESA
NLC-500
TESLA-500
Charge/Train
5 x 1011
14.4 x 1011
Repetition Rate
10-30 Hz
120 Hz
5 Hz
Energy
25-50 GeV
250 GeV
e- Polarization
85%
80%
Train Length
270ns / 340ns
267ns
1 ms
Microbunch spacing
0.3ns / 340ns
1.4ns
337 ns
Bunches per train 2
2820
Bunch Charge
2.0 x 1010
Energy Spread
0.15%
0.3%
0.1%

7. Secondary Beams to ESA

8. Secondary Beams to ESA cont.
These low intensity beams have been useful for many calorimeter and other tests
1) Secondary electrons
• 500 MeV to 20 GeV
• usually one particle/pulse, but 3-4 mm rms half-width spot
• High momentum resolution
2) Tagged photon beam using secondary e- (see above) on a bremsstrahlung target with tagging magnet and detector in the end station
3) Hadrons and positrons are produced with a 0.5 r.l. Be target in Beam switchyard (BSY)
• Accepted into A-line at a 0.5 degree production angle. Small Acceptance 2.3x4 cm over m drift.
• Averaging one particle/pulse allows use of TOF and Cherenkov techniques for particle identification for 5-20 GeV.
• At 14.5 GeV for 0.4 particles/spill total the yield was
0.25 e+/spill
0.17 hadrons(K+,π+)/spill
0.01 protons/spill
see GLAST 1999 test results, SLAC-PUB-8682

9. CERN

11. Protvino electron beam line parameters
IHEP
Protvino electron beam line parameters
- Beam line #2B from internal target is used
- Negative beam
Momentum range (1-45) GeV/c
- Measurement by tagging system possible

12. Protvino, beam line parameters
Electron and hadron beam
from PbWO4 array

13. DESY

14. DESY test beams, secondary beams

15. General Impressions of Test Beam Facilities
DESY: Probably the best place for low energy (< 6 GeV) electrons
IHEP: Can get to higher energies for electrons. Good general purpose beam. Limited availability during year.
CERN: excellent all around beams. Limited availability during year. Unknown future.
SLAC: Excellent for accelerator component testing. Secondary beams for detector testing are good but have low rate.
FNAL: Good availability with general purpose beam. Probably have to share with other users. Electrons are problematic.