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MC_060803
Muon Beam Lines 8/3/06
• Want a beam of ~300MeV/c– This requires a beam of ~300 MeV/c
• Possible Sources: SY
• Proton Beam line components removed.• Neutrino Beam line components removed.• Meson
– Meson Test Line– MIPP Line– SY 120 Will not transport 8GeV/c protons
P2,P3 beamlinesTransfer Hall
‘SwitchYard 120’ Project:- Delivers Main Injector beam to Meson Detector Building- Runs in conjunction with protons delivered to pbar source (and eventually NUMI)- Spills to SY120 can impact pbar production by no more than 5%
Split between pbar production and SwitchYard
Switchyard
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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 areasLockable work area for small scale staging or repairs.
Scale:
~6 m
Operational Characteristics
• There are several operational modes:– Proton Mode: Tune beamline for 120 GeV protons that get transmitted through the target. Rates at
the user area are limited to 1 Mhz. 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)
– Muons: By inserting a beam stop upstream, muons of tagged momentum less than 66 GeV can be delivered to both areas. By inserting the beam stop between the two user areas, muons of indeterminate momentum can be delivered to the downstream area. The former mode has not been tested. The latter mode has delivered 100 Hz of muons to the user area.
– Electrons: At low momentum (< 5 GeV), the beamline delivers an enhanced electron fraction, at very low rates. There are intermediate target wheels and sweepers to attempt production of an electron beam at higher momentum. This mode has not been tested yet.
• Fast extraction delivers from 20-80 buckets of 20 nsec duration. Each bucket has ~ 500 particles. Can insert beamstop to reduce rate to 0.5 particle/bucket.
• Resonant extraction delivers ‘smooth’ beam over .4 sec spill. Spill can be made shorter – down to 10 or 20 msec – thus making more intense beam.
• Spot sizes can be made as small as 3-5 mm square (with 120 GeV protons) and as large as 5 cm square.
Positive Particle Rate
0.00
10.00
20.00
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0 20 40 60 80 100 120
pion
proton
Total
Predicted maximum rates in MT6 as a function of momentum for pions and protons
kHz
GeV
Status of Fermilab Test Beam• Several experiments have taken data or are currently doing so. Other
experiments will be installing in the summer.• 120 Gev, 66 GeV and 33 GeV beams have been delivered. Both fast
extraction and slow spill have been tested.• A low-rate, broad-band muon beam has been established• Tracking and DAQ near completion
– Either fast spill (0.4-1.6 sec) or slow spill (.02-.6 sec)– Typical operation of 1 spill/minute. Can request higher rates.– ~50 K protons/spill at 120 GeV– ~3 K secondary beam/spill at 66 GeV– Lower momenta will give lower rates– Muon filters decrease beam by ~10-3
– Beam spot sizes of ~3 mm square at 120 GeV
Summary of Operational Characteristics
} (Beam rates have improved x5 since these results)
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Secondary Rates total
p GeV/c p K+ pi+ positives rate
5 1,532.20 327.63 24,007.99 25868
15 16,181.20 4,435.57 71,414.81 92032
25 52,562.76 8,591.27 112,577.65 173732
30 81,580.54 10,434.30 127,705.79 219721
40 166,644.31 12,941.89 139,442.72 319029
50 292,889.28 13,384.52 127,885.23 434159
60 459,856.29 11,917.44 100,943.11 572717
70 652,270.10 9,192.79 68,340.97 729804
80 829,714.68 6,023.75 38,463.27 874202
90 917,282.41 3,163.15 16,675.36 937121
100 809,763.17 1,147.60 4,626.55 815537
110 428,939.55 175.94 447.73 429563
MIPP- Yields
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MIPP- Yields
Secondary Rates total
p GeV/c p-bar K- pi- negative rate
5 1039.96 231.64 15508.10 16780
15 2216.02 2458.68 52484.63 57159
25 1887.72 3360.74 59668.71 64917
30 1603.29 3401.44 58374.67 63379
40 1016.17 2887.28 51568.62 55472
50 530.56 1964.00 41145.82 43640
60 220.92 1080.32 29050.91 30352
70 69.87 470.93 17620.60 18161
80 15.33 153.13 8754.62 8923
90 1.95 32.49 3247.88 3282
100 0.09 3.27 725.76 729
110 0.00 0.06 48.67 49
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• The size of the beam goes as (120/E)1/2
• For an 8GeV beam the beam size is >3 times larger than the size at 120GeV. (Depends on dp/p)
• Can get an 8GeV beam to the transfer hall but not to the Meson Target Train.
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