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RF Pulsed heating experiments in JINR, Dubna

RF Pulsed heating experiments in JINR, Dubna. (The major improvement that were observed during my visit to JINR in September 2001 are included). RF pulsed heating experiments in Dubna. RF Pulsed heating experiments in JINR, Dubna, 2001-2002. #1 Initial stage .

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RF Pulsed heating experiments in JINR, Dubna

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  1. RF Pulsed heating experiments in JINR, Dubna (The major improvement that were observed during my visit to JINR in September 2001 are included).

  2. RF pulsed heating experiments in Dubna RF Pulsed heating experiments in JINR, Dubna, 2001-2002. #1 Initial stage. Demonstration of the technical feasibility of the RF source routine operation under specified conditions (30 MW, 100 ns). (JINR, Dubna) Design of the test cavity and RF transport system. (IAP, Nizny Novgorod). #2. First stage Assembling of the test setup in Dubna and initial run with the short statistic to demonstrate the full regime of operation. #3. Second stage. The routine operation with the specified level of the surface pulsed heating. The end of the session with the test cavity Q-factor reduction twice from the nominal value.

  3. RF pulsed heating experiments in Dubna The major improvement that were observed during my visit to JNR September 2001. Repetition rate. The “plug” power stabilization. Will allow the stable operation independently of the JINR experiments. Cooling of the solenoid and wiggler are installed. 1 Hz successfully tested

  4. RF pulsed heating experiments in Dubna RF power measurements. RF power production. The new Braggs mirrors designed and manufactured. 20 MW x 200 ns was demonstrated. The measurements are performed with a modern equipment. The wattmeter for the high RF power calibration is installed

  5. RF pulsed heating experiments in Dubna The test area is prepared.

  6. 30.0 GHz RF pulsed heating experiments in Dubna The experimental result up to date. RF power. The frequency. 21 MW 200 ns “… Continuous monitoring by JINR of 104-105 FEM pulses for a nominal RF output of 30 MW x 100 ns … … at the repetition rate 0.5 Hz…”. Contract terms 6 consequent RF pulses generated with FEM utilizing new Braggs cavity with 0.5 Hz rep. rate. With a pulse heating experiment the important factor is a – PxT1/2. That is why the demonstrated RF power level over pulse duration we should consider acceptable: 21x2001/2 = 297, 300x1001/2=300, As well as operation at a 0.5 Hz rep. rate

  7. 10% ~PxT1/2 RF pulsed heating experiments in Dubna Test run #10 30.01.2001 500 shoots. Statistics. “… The demonstration would be considered successful if more than 70% of the pulses show a deviation from the nominal value less than 10% …”. Contract terms The only statistical data available up today, is based on the long test run performed at January this year (overall shoots ~ 1.4x104). at that time the RF power only of 10~12 MW was demonstrated at 0.25 Hz rep. rate. On a pictures the temperature rise spectrum together with PxT phase space for the best quality test run are shown. This is in a good agreement with the contract specs. PxT phase space 10%

  8. 10% Mean value Standard deviation lines Temperature rise, arbitrary 30 % off Serial number of the test run, each with 500 shoots (~35 min at 0.25 Hz) . RF pulsed heating experiments in Dubna Unfortunately the RF power level improvement efforts were done in parallel with a statistic study. The overall statistics over 104 pulses seems not as good as for the best run (see the picture). The situation will be significantly improved during following December 2001 test run: #1. HV stabilization improved. #2. RF system developed and fixed. #3.Numerous feedbacks are installed. #4. Rep. rate is increased by factor of 4.

  9. The RF transport system And test cavity assembly For the 25MW x 100 ns RF pulse: QL 650 1200 T0 215 420 RF pulsed heating experiments in Dubna Test equipment as is already designed in IAP “… Design and development studies by IAP-GYCOM (N. Novgorod) of the transmission line, mode converter test cavities and measurement system …”. Contract terms Special test cavity (H012) Magnetic field an a surface On-line measurements of the Q-factor degradation using TE31 mode launcher.

  10. RF pulsed heating experiments in Dubna Discussion with colleagues in Dubna. Basing on my private impressions about the real improvements towards the future routine FEM operation and experimental results being demonstrated as well as strong believe of the Dubna team that most of the problems are solved, we discussed the next half a year scenario: #1. Being accepted with CERN, the most efforts after obtained funding will be aimed to finish the full-scale-test in December this year with improved parameters, meaning the initiation of the stage 2. (Statistical study included). #2. Being ordered in October, the RF components for the tests will be manufactured and delivered to Dubna from IAP in February (opt.) –march (pess.) next year. #3. Demonstration of the stage 2 performance continuously followed by Stage 3 March-April next year.

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