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Report from RF Session (1:30-5:40 PM, 3/30/2004) H. Haseroth and Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory MICE Collaboration.

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Presentation on theme: "Report from RF Session (1:30-5:40 PM, 3/30/2004) H. Haseroth and Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory MICE Collaboration."— Presentation transcript:

1 Report from RF Session (1:30-5:40 PM, 3/30/2004) H. Haseroth and Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory MICE Collaboration Meeting at CERN March 31, 2004

2 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 2 MICE RF Eight 201.25 MHz cavities (4-cavity per module) with curved Be windows (21-cm radius and 0.38 mm thick) –Cavity body, ports, vacuum, probe, cooling channel –RF windows + couplers –Curved Be windows 8 MW (or more?) peak RF power system + distribution system –Low level RF control (RAL) –Driver amplifiers, amplifiers and PSs –Distribution system (rigid coaxial transmission lines, pressurization with dry N2 or SF6), hybrids vs circulators, phase shifters, …

3 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 3 Agenda

4 MICE RF - Power sources and distribution system (PD, HH and AM’s presentations) RF group at the Daresbury SRS Mike Dykes (group leader) Andy Moss (senior RF Engineer) plus two more MD & AM are here…

5 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 5 Baseline ? 4 MW Transmitter 2 MW Transmitter Master Oscillator 201 MHz Cavity Module 3 db Hybrid & Load Matched Splitter Circulator & Load

6 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 6 Split – Circulator - RF Scheme

7 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 7 RF Power Baseline Design 8 MW peak RF power: RF Power Design driven by cost issues (no funds for a new system) –Optimal – one amplifier per cavity Two amplifiers from LBNL = 4 MW total One or two amplifiers from CERN = 4 MW total –If 1 amplifier – needs a bigger drive? –Possibly more coaxial components from CERN Spare TH116 Tubes from ISIS Low level RF and RF layout (not covered this time)

8 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 8 RF Power Amplifiers available at CERN/PS There is one more amplifier from Linac1: It got modified to 88 MHz (foreseen for tests with our 88 MHz cavity for the cooling channel in the CERN scenario. 2 MW (FTH triode tube) driver (LHC type, modified) available If amplifier is modified: 4 MW achievable, but driver must be pushed Of course: to modify to 88 MHz and modify again is not too attractive…

9 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 9 RF driver Amplifiers available at CERN/PS 200 MHz: 3 amplifiers 350 (400) kW, one available now, 2 more in the near future (with Siemens tube no longer built). Still several spare tubes in stock. One tube good for up to 15 000 h in 300  s, 1 Hz, not full power regime. Needs power supply for 40 kCHF. Switching via cathode (5 kCHF). GSI (Hutter) says that change to a tube which is still available is not a major issue…

10 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 10 RF Power and Distribution (1) Hybrids versus circulators –Helpful discussions –Issues become clearer –Should come to an agreement soon RF experience from two communities: (reflection & isolation of RF power – protection of components) Synchrotron/storage ringLinacs Options:circulatorshybrids Costsexpensivecheaper Reliability + √ Sourceklystronstriodes Operation mode 99% for users …… A reasonable choice for MICE: hybrids

11 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 11 RF Power and Distribution (2) Rigid 50 Ω, 4 1/16”- 9 3/16” coaxial transmission lines with pressurized gas –SF6 gives higher P/P’ ratio, but have safety issues –Dry N2 at ~ 2 atm absolute pressure Cost of the Components (by AM): The cost of components assuming 25 feet of 9 3/16 straight and 4 EL-Bows and 25 feet of straight 6 1/8 and 4 EL-Bows 25 feet ST 9 3/16 line $5,600 25 feet ST 6 1/8 line$3,700 4 EL-Bows 9 3/16$10,300 4 EL-Bows 6 1/8 $6,800 The first Hybrid$8,000 Second Hybrid $4,500 First Hybrid Load $2,022 Second Hybrid Load$1,400 Mech. Phase Shifter $4,300 Several directional C$4,500 Total Cost = $49,722

12 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 12 Main power consumption and cooling requirements for 1 Hz and 1 ms pulse length: 2  4 MW rf require about 2  10 MW supply. Total: 20 kW with 0.1% duty cycle. Filament needs 2  360 A and 15 V = 2  5 kW = 10 kW. Total for final amplifiers: 30 kW Total for driver amplifiers:10 kW Grand Total for rf amplifiers:40 kW 50 % of power estimated to go into the cooling water: requires about 20 l/min water. The rest goes into the air… Available coax lines (9 inch?): 10 cubes for making 90  bends. Power Consumption (HH)

13 The 201.25 MHz Cavity with Be windows - Prototype (DL,RR,SY)

14 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 14 Status The 201 MHz cavity design and fabrication go smoothly Spun shells ready for machining after e-beam welding Nose pieces, stiffener rings and fixture were made Support structures for the equator welding RReady for equator welding tomorrow at JLab Engineering design (details) is still continuing PPorts (succeeded in extruding tests and qualified the techniques) CCouplers (done with conceptual design) TTuners Significant progress on curved window design and fabrication –S–Succeeded in making S.S. curved windows, curved Be windows for 805 MHz cavity by Brush-Wellman company –R–Ready for 201 MHz cavity windows The cavity will be ready for test at MTA, Fermilab this fall !

15 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 15 The Cavity Profile update De-mountable Pre-curved Be windows to terminate RF fields at the iris 2 o tilt angle Spherical section at the equator to ease addition of ports (± ~ 6 o ) Elliptical-like (two circles) nose to reduce peak surface field 6-mm Cu sheet allows for uses of spinning technique and mechanical tuners Stiffener ring

16 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 16 The Cavity Parameters The cavity design parameters –Frequency: 201.25 MHz – β = 0.87 –Shunt impedance (V T 2 /P): ~ 22 MΩ/m –Quality factor (Q 0 ): ~ 53,000 –Curved Be window radius and thickness: 21-cm and 0.38-mm Nominal parameters for cooling channels in a muon collider or a neutrino factory and MICE –16+/8 MV/m peak accelerating field –Peak input RF power ~ 4.6/1 MW per cavity (85% of Q 0, 3τ filling) –Average power dissipation per cavity ~ 8.4/1 kW – Average power dissipation per Be window ~ 100/12 watts

17 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 17 Recent progress for the welding f measured = 200.88 MHz

18 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 18 Ready For Equator Welding

19 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 19 Extruding tests at JLab

20 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 20 RF Coupler

21 Curved Be windows

22 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 22 Evolution of the pre-curved window Earlier window geometry: Concave radius > convex radius Intersecting point Concave radius R = 500mm Convex radius R=230.8mm Current window geometry Concave radius < convex radius 770 mm Intersecting point Convex radius = 498.11 mm Concave radius = 300 mm

23 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 23 Curved window thickness: 0.38 mm ( 100 C temperature gradient) Stress results Max stress 177 MPa Max stress 170 MPa Displacement: 3-D model Max bow 2.1 mm 2-D model Max bow 2.25mm

24 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 24 Analysis on the prototype window for 805 MHz cavity The new geometry – 16cm diameter window

25 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 25 Curved Be windows by BWM Two curved Be windows for 805 MHz cavity: 0.254 mm thick and 16-cm diameter Pre-formed the Be foils first at high temperature, brazed copper frames afterwards. The windows will be Ti nitrided at LBNL for high power test at MTA, Fermilab.

26 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 26 The 1 st mode frequency in 3D model is reasonably agree with that of its 2D model’s and also good agreement with ALGOR 3D result (1696 Hz). Solution from ANSYS 3D meshed ANSYS model The 1 st mode: 1695.3 Hz Mechanic Resonances

27 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 27 The 9 th mode: 4560 Hz Solution from ANSYS The 2 nd and 3 rd mode: 2055 Hz The 4 rd and 5 th mode: 3494The 6 th mode: 3754 Hz The 7 th mode: 3768 Hz The 8 th mode: 4544 Hz The 10 th mode: 4866 Hz Higher Mechanic Resonance Modes

28 Controls

29 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 29 Discussions on Blondel’s table ∆E: A few times 10 -3 of tolerance for RF voltage and phase –Voltage stability of 10 -3 is very difficult (impossible) –Phase stability: 0.5 degree –Measurement on beam Do best to keep the voltage as stable as possible

30 MICE Collaboration Mgt in CERN March 31, 2004 Report from RF Session Derun Li Center for Beam Physics LBNL Page 30 Summary 8 MW peak RF power sources have been identified, need to see actions (plans) on refurbishing and conditioning various components soon RF distribution system: hybrids versus circulators –Should reach an agreement for MICE soon Cavity prototype –Equator welding tomorrow (April 1, 2004) –Ready for ordering curved 201 MHz Be windows –Ready for high power test at MTA, Fermilab this fall Controls

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