Status of Table Top Test Katsuya Yonehara Tuesday Meeting - - PowerPoint PPT Presentation

Katsuya Yonehara Tuesday Meeting 9/19/2017

Status of Table Top Test

• Prepare beam test
• Bead-pull test

– Ready for test – Carry out this Friday

• Beam interaction with cavity material

Progress

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Prepare beam test

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• 1st Draft Technical Scope of Work

– Run plan

• Infrastructure

– Signal cable

• Found two cables
• Need a few more

– Gas line

• Order ¼’’ OD 400-ft PFA tube
• Maximum allowable working pressure < 300 psi
• Modify cavity

– Propose a beam window

• Need to re-evaluate the pressure safety assessment

Interacting beam with cavity material

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20000 40000 60000 80000 100000 120000 1000 2000 3000 4000 5000

Incident 5,000 protons: 120 GeV/c Rms beam size = 5 mm, rms x’ = 0.03 mrad in front of the cavity SS Plate: r = 57 mm, thickness = 8, 4, 1 mm SS Wall: inner r = 46.8 mm, outer r = 57 mm 1 atm air in the cavity

Extract tangential angle (rad) Total p (MeV/c)

No cavity Fragments

0.1 0.2 0.3 0.4 0.5 1000 2000 3000 4000 5000 6000

Fragment at plate thickness Ratio (8mm) = 1.04 Ratio (4 mm) = 0.55 Ratio (1 mm) = 0.17

Tangential angle = pr/pz

Proposed cavity

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Beam entrance window Radius = 10 mm Thickness = 1 – 1.5 mm

8 mm

Weld ¼’’ SS pipe for gas inlet line

Reduce the amount of material

• n the beam path

Run plan

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Beam intensity Lowest 1/10 x I0 1/5 x I0 I0 (full) N2 High Q Low Q Low Q Low Q + 0.01 Dry air High Q Middle Q Middle Q Low Q + 0.05 Dry air High Q Middle Q Middle Q Middle Q + 0.20 Dry air High Q High Q High Q Middle Q Dry air High Q High Q High Q High Q He High Q Low Q Low Q Low Q + 0.01 Dry air High Q Middle Q Low Q Low Q + 0.05 Dry air High Q Middle Q Middle Q Low Q + 0.20 Dry air High Q High Q High Q Middle Q Beam parameter

120 GeV/c protons, I0 = 3e12 ppp, 1.5 µs/pulse, beam delivered every 60 seconds, bunch length = 1 ns, Normalized transverse beam emittance 18 pi mm mrad, rms r = 5 mm, rms x’ = 0.03 mrad

RF parameter

2.45 GHz, E = 333 V/m, Pressure = 1 atm, dE/dx = 3.3 MeV cm2/g = 3,860 eV/cm (N2) Integrate ne = 4.3E14 ion pairs/cm3/pulse P = 10-7 J/p > High Q, 10-5 J > Middle Q > 10-7, Low Q > 10-5 J P = 𝑜" ̇ 𝜐 10-20, High Q ~ 800, Middle Q ~ 500, Low Q ~ 200

• Start from dry air at the highest beam intensity and low Q mode
• 10 beam pulses for each point

– 36 points x 10 pulse = 360 pulses à 360 minutes = 6 hours

• RF signal is taken for each pulse during the beam is turned off
• Fix beam intensity and change gas mixing rate
• Change beam intensity and quality factor

– Need to access to the exp hall to adjust the quality factor – We need to access at least two times – Probably, we wait for a couple of days for cooling – Try to use weekend as a cooling time

• Apply factor two for time contingency

– 6 hours x 2 = 12 hours

• We work a day time and week day in two weeks

– 2 weeks x 5 days x 8 hours = 80 hours

• This does not involve the beam commissioning

Run plan (II)

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Layout

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Experimental hall Cavity location Data acquisition room RF detector Gas bottle

Experimental hall

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120 GeV/c protons Uni strut:

Height and horizontal position are adjustable

Ion chamber will be replaced by the test cavity

• A pair of 3/8’’ heliax cables
• More heliax available
• Need to stretch ¼’’ OD 400-ft PFA gas tube
• Cavity will be assembled on a uni-strut

– Need to design the support

Setup infrastructure & Design support

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cavity ¼’’ PFA gas line Support G10 plate (exist) 8 inches bolt

• Calibrate cable

– Insertion loss by using Network Analyzer – Timing by using a fast scope and pulser (function generator) – Need to bring NA, scope, and pulser to the Switchyard service building

• Gas line

– Purchase a PFA gas tube – Build a manifold (take from MTA) – Need to stretch the gas line from the SSB to hall

• Modify cavity

– Beam window – Gas inlet line

• New pressure safety assessment
• New TSW

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To-do list in two weeks