Post on 04-Jan-2016
Fermilab Test Beam Facility
Aria Meyhoefer (soon to be Soha)
May 10, 2010
LocationMeson Detector Building – West
Beam Delivery
Tevatron
Neutrino Line
MTest
MCenterLinac
Booster8GeV Line
Main Injector
P1 Line
P2 Lin
eP3 Line
SY120
• Booster captures protons into 84 bunches (1 batch) and accelerates them to 8GeV
• Bunches are 19nsec long
• 8 – 30 bunches are extracted to Main Injector (MI) (Partial Batch)
• Full batch is 2E11 protons
• Each batch is 0.2 – 1.6 μsec in length
• MI accelerates beam to 120 GeV
• Fraction of the beam resonantly extracted each rotation over 4.2 sec
• SY120 to Meson line
Operating
• Test Beam is allowed a 5% impact on HEP• 6 sec event every 60 seconds for 12 hours a day• 0400 – 1800• Stop for HEP Shot Setup (2 hrs)
3 spill options:• Single 4 sec spill/minute• Two 1 sec spills/minute• Several millisecond level
bursts per minute
Meson Beamline
MTest Beamline
MCenter Beamline
MT4 Target: 30cm Al
MT1 Target: 25cm Al
MT6 Absorbers: 1.5m
• 120 Gev Protons• 2 - 66 GeV Pions• 0.5 – 32 GeV Electrons• Broadband Muons
New Request
• MINERvA experiment requested ~200 – 1000 pions/spill, with momentum as low as 200 MeV/c
Tertiary Beamline
1. 16 GeV pion beam hits a copper target and steel collimator at the entrance to MT6.2
2. Particles emerge at a 16o angle
3. Scintillator
4. Wire chamber
5. Wire Chamber
6. Spectrometer magnets to straighten beam
7.
8. Wire chamber
9. Wire Chamber
10.MINERvA detector
Tertiary Beamline
Tertiary Beamline
MINERvA Detector
Right Now
• MINERvA Engineering run: event rate: 50Hz = 200 triggers per 4-second spill
trigger purity momentum distribution: peak around 700 MeV/c
time of flight performance: better than 250ps
• Already 1 user request (SuperB)
Thanks
• Erik Ramberg• Doug Jensen• Julius Lentz• Jim Kilmer & Crew• Rick Coleman, Chuck Brown
• Additional Slides
The Test Beam Facility
• World Class Facility• Detector R & D focus
22 experiments 315 collaborators 94 institutions 20 countries
20062007
20082009
2010*
0
5
10
15
20
25
Experiments
Institutions
Collaborators
Countries
Experiments Institutions Collaborators Countries
*Data for 2010 is still being compiled
Particle Composition of Beam
Beam Energy (GeV)
Rate at Entrance to Facility (per spill)
Rate at Exit of Facility (per spill)
% Pions,
Muons
% Electrons
16 132,000 95,000 87% 13%
8 89,000 65,000 55% 45%
4 56,000 31,000 31% 67%
2 68,000 28,000 <30% >70%
1 69,000 21,000 <30% >70%
• If beam were smoothly extracted, 100 kHz or less would imply 1 particle per MI rotation would occur.
• Beam extraction is not smooth resulting in up to 35% double occupancy per MI rotation