![](media/image1.jpeg){width="5.997222222222222in"
height="0.6284722222222222in"}

Previous minutes and documentation available at:
<http://tdweb.fnal.gov/HINS>

Meeting minutes of Nov 29^th^ 2007

Slava Aseev - Energy Table - Power consumption in the RT CH section

[Link to
file(.ppt)](http://tdweb/HINS/MeetingMinutes/2007/20071129/Aseev_RTpower.ppt/download)

[*Link to
file(.xls)*](http://tdweb/HINS/MeetingMinutes/2007/20071129/Aseev_RTpower.xls)

> MWS Cavity voltage definition and TRACK cavity voltage definition were
> used. Example of cavity CH-2 showed that the two definitions give very
> similar results.
>
> Synchronous voltage (U~s~) gain is slightly different from MWS voltage
> (U~mws~) gain. Beam energy gain is very close to the voltage produced
> by the cosinus.
>
> Total power consumptions in cavities are P~beam~=75.9 kW and
> P~copper~=337.9 kW, compare to P~beam~= 77kW and P~copper~=348kW of
> the Feb 2007 version with 16 different cavity designs. These power
> consumptions are calculated based on an average current of
> I~ave~=10mA. Alfred suggested that we should have energy table
> calculated for I~ave~=16mA, with considerations of choppers taken into
> account.
>
> Cavity #3 and #4 have the same shunt impedance while each carries
> different betas. This is needed to be checked.
>
> Gennady and Slava will discuss and finalize the energy table for 16
> cavities with 9 designs.

Gennady Romanov - Power distribution in RT part

[Link to
file](http://tdweb.fnal.gov/HINS/MeetingMinutes/2007/20071129/On_RF_distribution_in_RT_part.pdf)

> Evaluation of the RF distribution system has been presented. The
> analysis confirmed that the system can easily deliver required power
> to all room temperature cavities and provide adequate power level
> adjustment. But it was remarked that the system design could be more
> optimized and simplified though. It was concluded that the vector
> modulators alone can not provide necessary phase adjustment between
> beam and accelerating field. Several ways to expand phase tuning
> capabilities have been discussed.
>
> Gennady suggested that since the IQM gives a phase shift of only
> +/-450, additional phase shift is needed between adjacent couplers.
> Mechanical phase shifter with +/-1800 will be a feasible and
> convenient choice.
>
> Alfred mentioned that the IQM gives a phase shift of +/- 600. He
> agreed that mechanical phase shifter is a good choice, but the cost of
> it is high. Bob Webber and Alfred suggested that a less expensive way
> to deal with the matching of the phases is to use +/-600 IQM together
> with cable with specific length.
>
> Bob Kustom mentioned that we can work out the phase downstream from
> the RFQ. It acts as a reference to the rest of the IQM in the beam
> line.

Bob Webber - Report on the status of the RFQ

> The RFQ has been put into the tuning facility this week and should be
> ready for bead-pull test by mid-December. Hopefully it will arrive at
> FNAL by January 2008.

Waiming Tam - Test of room temperature tuners on RTCH#1

[Link to
file](http://tdweb.fnal.gov/HINS/MeetingMinutes/2007/20071129/robustness.ppt)

> Report on the test of tuners installed in cavity CH-1. With both of
> the two tuners working sensitivity of the resonant frequency of cavity
> to the movement of tuners is 30.7 kHz/mm, while Q changed by 2% in a
> stroke of 42 mm. Alfred mentioned that he measured a 10% change of Q.
> This is needed to be verified.
>
> Known problems prior to test are found to be squirming of bellows,
> catching of bellows on hard stop of shaft and possibility of falling
> copper plungers.
>
> Plungers were fixed with set screw on tuner before testing. Test with
> stroke of 32 mm at 0.8mm/s for 78 hours (3300 cycles). Low power was
> used. Ion pump was on. Phase-locked-loop was on to keep track of the
> resonance frequency.
>
> Results (graph) show that resonance frequency of the cavity responded
> to the movement of the tuner normally. Pressure stayed constant at
> around 6.9e-9 torr. The tuner passed the test. Design is under
> revision now. Maximum stroke will be cut into half and proximity
> switches will replace electronic one. Other mechanical improvements
> such as different shaft and different bearings will be implemented.