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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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slide1

RF Pulsed heating experiments in JINR, Dubna

(The major improvement that were observed during my visit to JINR in September 2001 are included).

slide2

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.

slide3

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

slide4

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

slide5

RF pulsed heating experiments in Dubna

The test area is prepared.

slide6

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

slide7

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%

slide8

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.

slide9

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.

slide10

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.