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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

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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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