1. MuCool RF Status MICE Collaboration Meeting June 7-10, 2006, Fermilab A. Moretti June 9, 2006

2. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/062 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

3. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/063 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.

4. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/064 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.

5. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/065 MTA Experimental Layout Rad Detector # 1 Detector # 2 805 MHz Cavity 201 MHz Cavity 5 T Solenoid 1.34 m 1.16 m Window 0.2 m Detector # 3 8 scintillation counter are being installed to measure angular Radiation Distribution.

6. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/066 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

7. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/067 201 MHz Photo-multiplier Arc Detector Operates at 24 V with internal HV multiplier, 0.038 m Dia and 0.088 m Length

8. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/068 201 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

9. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/069 Control Racks and Modulator for the 201 MHz Amplifier Linac Gallery: Control Racks Modulator

10. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0610 805 MHz Amplifier in the Linac Gallery 805 MHz in Linac Gallery: 12 MW klystron Pulse Forming Network Power Supply

11. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0611 First MTA 805 MHz Cavity under Test 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.

12. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0612 First RF 805 MHz Commissioning in the MTA without Magnetic Field

13. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0613 First RF 805 MHz Commissioning in the MTA without Magnetic Field View of same on 10Log scale

14. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0614 First 805 MHz Radiation Measurement in the MTA with Magnetic Field compared to No Field Data

15. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0615 805 MHz Rad Data Before, During and After Operation with Magnetic field 2.5 T Line Lines After Field operation First lines No Field

16. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0616 Comparison of Lab G Results with the MTA Data MTA Result

17. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0617 201 MHz Radiation vs. RF Commissioning Time

18. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0618 Lab G Pill Box Cavity X-Ray levels

19. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0619 Muons, Inc MTA High Pressure H2 Experimental results

20. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0620 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.

21. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0621 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.

22. Fermilab A. Moretti, Mice Collaboration Meetin, 06/09/0622 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)