MuCool RF Status MICE C ollaboration Meeting June 7-10, 2006, Fermilab

1. MuCool RF StatusMICE Collaboration MeetingJune 7-10, 2006, Fermilab A. Moretti June 9 , 2006

2. Talk Outline • Purpose and Description of the Experimental 201 MHz and 805 MHz Setups • Conditioning Radiation measurements over time with some Old Lab G measurements • Effect of 2.5 T Magnetic Field on Breakdown limit and radiation. • Current Status 06/09/2006 • Conclusions and future plans A. Moretti, Mice Collaboration Meetin, 06/09/06

3. Purpose for Test Setups in the MTA • Study Breakdown Limit of Vacuum Cavities. • Study Dark Current and X-Ray emissions at high gradient. • Study the effect of High Magnetic on Breakdown, Dark Current and X-Ray emissions. • Study Fast Muon Detectors in this environment. • Study methods to reduce dark current with different materials, Coatings and processing. • Also used by Muoninc to study same in High Pressure Gas (H2) Cavities. A. Moretti, Mice Collaboration Meetin, 06/09/06

4. Description of the Experimental Setups • Same as in Lab G and the Fermilab Linacs: • Linac Modulator and Controls. • 12 MW, 805 MHz Klystron and WR975 Waveguide; and 5 MW, 201 MHz Amplifier and 0.23 m Coax Line. • Cavity High Vacuum System. • Cavity Water System. • 5.0 T Solenoid. • Support Cryogenic System. • X-Ray Shielded Cave and X-Ray monitors. Surrounding the cavity. • Interlocked RF with Sparking, Cavity Vacuum • and External X-Ray level. A. Moretti, Mice Collaboration Meetin, 06/09/06

5. MTA Experimental Layout 8 scintillation counter are being installed to measure angular Radiation Distribution. 5 T Solenoid 805 MHz Cavity Window 201 MHz Cavity Rad Detector # 1 Detector # 3 Detector # 2 0.2 m 1.16 m 1.34 m A. Moretti, Mice Collaboration Meetin, 06/09/06

6. View of MTA Experimental Layout 201 MHz Drive Line: .23 Dia Coax Split in middle to Drive the Two cavity coupling Ports. Coax is necked down in size to 0.15 Dia and finally 0.10 Coax for the Couplers; length 120 m 805 MHz Drive Line: WR975 Waveguide; length 120 m A. Moretti, Mice Collaboration Meetin, 06/09/06

7. 201 MHz Photo-multiplier Arc Detector • Operates at 24 V with internal HV multiplier, • 0.038 m Dia and 0.088 m Length A. Moretti, Mice Collaboration Meetin, 06/09/06

8. 201 MHz Triode Cavity Amplifier 5 MW • RF Power- 5 MW • Pulse- 500us, 15 Hz • Grounded Grid • Cathode driven • Freq- 201.25 MHz • Gain- 28 dB. • 25-30 KV, 300 A Modulator Cavity Amplifier A. Moretti, Mice Collaboration Meetin, 06/09/06

9. Control Racks and Modulator for the 201 MHz Amplifier Linac Gallery: Control Racks Modulator A. Moretti, Mice Collaboration Meetin, 06/09/06

10. 805 MHz Amplifier in the Linac Gallery 805 MHz in Linac Gallery: 12 MW klystron Pulse Forming Network Power Supply A. Moretti, Mice Collaboration Meetin, 06/09/06

11. First test with Curved Be Windows coated with TiN. Flat windows were Freq unstable because EM impulse. Frequency instability stopped by Eddy current brake in Magnetic Field. Curved window have been shown to be frequency stable without magnetic field. First MTA 805 MHz Cavity under Test A. Moretti, Mice Collaboration Meetin, 06/09/06

12. First RF 805 MHz Commissioning in the MTA without Magnetic Field A. Moretti, Mice Collaboration Meetin, 06/09/06

13. First RF 805 MHz Commissioning in the MTA without Magnetic Field View of same on 10Log scale A. Moretti, Mice Collaboration Meetin, 06/09/06

14. First 805 MHz Radiation Measurement in the MTA with Magnetic Field compared to No Field Data A. Moretti, Mice Collaboration Meetin, 06/09/06

15. 805 MHz Rad Data Before, During and After Operation with Magnetic field Lines After Field operation First lines No Field 2.5 T Line A. Moretti, Mice Collaboration Meetin, 06/09/06

16. Comparison of Lab G Results with the MTA Data MTA Result A. Moretti, Mice Collaboration Meetin, 06/09/06

17. 201 MHz Radiation vs. RF Commissioning Time A. Moretti, Mice Collaboration Meetin, 06/09/06

18. Lab G Pill Box Cavity X-Ray levels A. Moretti, Mice Collaboration Meetin, 06/09/06

19. Muons, Inc MTA High Pressure H2 Experimental results A. Moretti, Mice Collaboration Meetin, 06/09/06

20. Conclusions and future plans • Results of Lab G have been verified in the first running at 805 MHz in the MTA. • We need to continue the study to determine the mechanism for the enhancement of Dark Current in Large Magnetic fields: does it increase number of emitters, the electric enhancement factor, or both? • The button cavity will be used to study these and other questions: materials, coatings, etc. • Scintillations counters to Study Angular Distribution of Emissions. A. Moretti, Mice Collaboration Meetin, 06/09/06

21. Button Cavity to continue the 805 MHz Study with different Materials and Coatings. Removable Button Insert to study different materials, treatments processes and coatings for their effects on breakdown and eissions. A. Moretti, Mice Collaboration Meetin, 06/09/06

22. Current Status • After the long 3 Month Accelerator Shut Down. • 201 MHz Amplifier Refurbishing is nearly completed. • Magnet Cryogenics Problems have been studied and solutions implemented. • The 805 MHz and 201 MHz Experimental Program is scheduled to resume on or about 06/15/06. • 805 MHz and 201 MHz Study of Radiation Angular Distribution is ready; Paddle scintillation and Electronics is nearly completed. • Plans are underway to move the 201 MHz cavity closer to the Magnet so as to be in the Fringe Field of about 1.25 T. • Plan to install Proton Beam is underway and funded (1 Year) A. Moretti, Mice Collaboration Meetin, 06/09/06