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