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

Status of Table Top Test Katsuya Yonehara Tuesday Meeting 9/19/2017

Progress • Prepare beam test • Bead-pull test – Ready for test – Carry out this Friday • Beam interaction with cavity material 2 9/19/17 HPRF meeting, Yonehara

Prepare beam test • 1 st 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 3 9/19/17 HPRF meeting, Yonehara

Interacting beam with cavity material 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 No cavity 1 atm air in the cavity 6000 5000 Fragments 5000 4000 Fragment at plate thickness 4000 Tangential angle = pr/pz Ratio (8mm) = 1.04 3000 Ratio (4 mm) = 0.55 3000 2000 Ratio (1 mm) = 0.17 2000 1000 1000 0 0 0 20000 40000 60000 80000 100000 120000 0.1 0.2 0.3 0.4 0.5 Extract tangential angle (rad) Total p (MeV/c) 4 9/19/17 HPRF meeting, Yonehara

Proposed cavity Reduce the amount of material on the beam path Beam entrance window Radius = 10 mm Thickness = 1 – 1.5 mm 8 mm Weld ¼’’ SS pipe for gas inlet line 5 9/19/17 HPRF meeting, Yonehara

Run plan Beam parameter 120 GeV/c protons, I 0 = 3e12 ppp, 1.5 µ s/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 n e = 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 Beam intensity Lowest 1/10 x I 0 1/5 x I 0 I 0 (full) N 2 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 6 9/19/17 HPRF meeting, Yonehara

Run plan (II) • 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 7 9/19/17 HPRF meeting, Yonehara

RF detector Layout Data acquisition room Gas bottle Experimental hall Cavity location 8 9/19/17 HPRF meeting, Yonehara

Ion chamber will be replaced Experimental hall by the test cavity 120 GeV/c protons Uni strut: Height and horizontal position are adjustable 9 9/19/17 HPRF meeting, Yonehara

Setup infrastructure & Design support • 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 ¼’’ PFA gas line cavity Support G10 plate (exist) bolt 8 inches 10 9/19/17 HPRF meeting, Yonehara

To-do list in two weeks • 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 11 9/19/17 HPRF meeting, Yonehara