[Plan of Work Towards a WG Phase Shifter]{.underline}

I.  Low power level measurements (Done)

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1.  Procure ferrite --

> 0.8" x 2" x 6" CG-175A (3 ea) and CG-250A (1 ea)

2.  Make a waveguide of needed height with two coax-to-w/g transitions

# WR-650 with internal height of 2". Coax-to-wg transition was used. The other end was shorted. YIG plates CG-175A were supported in the w/g using scotch tape. The system has been calibrated using spectrum analyzer before placing in magnetic field.

3.  Find a magnet to generate needed field.

The magnet in MS-7 was used

There is a Cooling Ring Dipole also available in the TD magnet storage
area.

Gap -- 3.25"

Length -- 48"

Width -- 12", Field aperture -- 8" (10^-4^)

Number of turns -- 40

Max. field -- 4.3 kGs

Current -- 711 A (for 2.5 kGs -- 413 A)

Voltage -- 17.8 V (for 2.5 kGs -- 10.35 V)

Power -- 12.6 kW (for 2.5 kGs -- 4300 W)

Cooling water -- 4,4 GPM

Cross-section -- 22" x 10"

Weight -- 2100 lbs

It sounds like just what we are looking for. Only we need to find a
power supply:

U = 10 V

I = 500 A

This power supply will work also for the home-made magnetic system under
consideration for high power test.

4.  Measure current-to-field efficiency

# Hand-held magnetometer was used in combination with the Hall Effect meter provided by Jim Volk to calibrate the system.

5.  Make the system modeling

# Full modeling has been performed to compare with calculation results

Some disagreement was notices in phase shift prediction.

6.  Measure phase shifting properties (Phi vs B) and losses. Compare
    with calculations.

See results posted in the meeting folder.

**II. High power level measurements (CW) (End of July ??)**

1.  Procure ferrite that meets our needs --

# Ferrite will come on July 10: ten pieces 6" x 1" x 2" CG-550A

2.  Design (July 02) and fabricate (July 16) a waveguide system

Issues:

> 1 Waveguide H = 2" with water cooled side walls. During the first
> stage (CW) it is possible to use just copper. Later Cu coating on SS
> is needed for fast phase shift test.

2.  Thermal Contact. During the initial stage, conducting (thermal)
    paste can be used. Later a technique to glue (solder) the ferrite
    blocks must be found and tested.

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3.  A launcher must be designed and built (or procured).

4.  A directional couplers must be procured.

5.  Do we need a circulator and a load?

# Microwave design work needs to be done. 

3.  Design (June 25) and build (July 09) magnetic system

    1.  Preliminary design work was done to a reasonable stage of
        convergence (see picture below).

    2.  There is an agreement that the work can be done in IB-2. Coil
        winding tooling is being fabricated

    3.  It will take about week to wind the four coils when somebody is
        freed from the Run2 urgent work. (preliminary agreement exists)

    4.  Core design work starts this week

    5.  Waveguide design follow the core design

    6.  

### Find a power supply (Bring to a point of use if exists)

DC

U = 10 V

I = 500 A

4.  Decide on instrumentation (thermal gauges, magnetic field gauges)

5.  Make RF and thermal measurements (Phi vs B) using up to 1200 kW
    input to adjust for doubled field. Compare with the model.

What power source to use at this stage??

![](media/image1.jpeg){width="5.995138888888889in"
height="5.090277777777778in"}

In Future to plan:

## III. Pulsed measurements

1\. Make a waveguide suitable for pulsed operation - read it AC magnetic
field must penetrate

2\. Design and build magnetic system - it will use a ferrite core and
water cooled magnetic system. Transition characteristics on making the
power on will help to determine the system time constant.

3\. Find / build power supply - this we will need in any case.

4\. Make low level and high power level measurements of a fast phase
shifting properties.

## IV. Modeling the work of the system in a feedback loop

1.  Make a mockup cavity that has an adequate ringing capability.

2.  Get a phase comparator

3.  Develop and build a power amplifier

4.  Check the work of the system making low power level measurements.