[Bteam] notes from today's meeting

[Joe Grames]

I still think it would be cool to put Stairway to Heaven on the beam via 
the tune mode PC and pick it up on the hall BCM.

Arne - FY10 $$$ ?

tiefen at jlab.org wrote:
> On Wed, 18 Nov 2009, Arne Freyberger wrote:
>
>   
>>     1.3 Viewer limited BPMs Tief
>>
>> Proposal to adjust the timing of the viewer limited beam pulse so that the 
>> BPMs work during viewer limited mode.
>>
>>   * Summary
>>     Viewer limited pulse is 10 ? s
>>
>>     This will require better timing on BPMs?
>>     
>
> Where did this question on BPM timing come from?  I've asked to put the 
> viewer limited pulse in sync with the linac 4-usec trailer.  There is NO 
> requirement for BPM timing changes, only to sync the viewer limited pulse 
> with the 350-usec delayed trailer instead of having it occur at beam sync 
> zero.  If this were done and the viewer limited pulse were selected to 
> have a 4 microsecond duration, then the linac bpms would light up in 
> multipass mode to guide steering of the beam at reinjection through the 
> linacs instead of tripping RF after a few seconds (or milliseconds).  The 
> ability to do this was important during commissioning of CEBAF at 4 GeV, 
> and was frozen out by a "let's keep the operators from making errors" 
> philolophy of severely restricting options for pulse structure.  We're 
> going to need it again, and we would have benefited from it in the recent 
> past.
>
>   
>>     Delay viewer limited pulse.
>>
>>     Take it up next week.
>>
>>     
>
> I'm sorry to have been ill.  It would have been useful for me to explain.
>
>   
>>     1.4 FY10 projects ALL
>>
>> Any thoughts on what Bteam wants to accomplish in FY10. There are two downs 
>> in FY10, Jan/Feb Winter down and the July/Aug Summer down.
>>
>>   * Continue/complete BSY diagnostic suite?
>>         o viewers in front of dumplettes
>>         o move more harps?
>>   * Open to ideas
>>         o halo detector in BSY
>>     
>
> Good idea.
>
>   
>>         o finish the matching algorithm. Prove that our present
>>           diagnostics and software provide a good match which is
>>           verified by downstream harps.
>>         o Continue/finish ODR R&D in Hall-A
>>         o get undulator from Darsburry and put in a chicane. Can tune
>>           to different energies, so in the linac one can measure beam
>>           size of all five passes. Need a meter at the end of linac in
>>           12 GeV and a new vacuum chamber in the BCOM.
>>     
>
> How is this better than a wire scanner profile monitor?  Is the 
> improvement to allow measurement at full CW beam current?
>
>   
>>         o Replace 5 MeV dipole. Retain -12.5, -30 degree ports, and
>>           +12.5 or +30 degree ports. Magnet, vacuum chamber, power
>>           supplies. Horizontal gap is XXX? Does ISU have such a
>>           magnet? What are the field requirements? What are the space
>>           limitations?
>>
>>
>>     1.5 Optics-on-call
>>
>> Outgoing
>>   Mike Spata, Geoff Krafft Incoming
>>   Alex Bogacz
>>   * Program
>>         o Production running in A and B
>>         o Possible Compton optimization
>>         o Thaw the turkey
>>     
>
> We never did a real test of the reduced buncher configuration that Reza 
> tuned up and which looked much more like "old times" behavior than the 
> present configuration does.  The "bunch length" process which is used to 
> characterize bunch compression mangled the settings when it "restored" to 
> canonical phases rather than to the as-found phases when it was turned on. 
> When we tried to transport beam through the Compton Chicane, conditions 
> were not as they were when optimized.  I think this should get a re-check.
>
>   
>> Date: 2009-11-18 15:45:00 EST
>>
>> HTML generated by org-mode 6.32trans in emacs 23
>>
>>
>> -- 
>> Arne Freyberger
>> Director Operations Department
>> Jefferson Lab           Phone: (757) 269-6268
>> 12000 Jefferson Avenue  Pager: (757) 584-6268
>> Newport News, VA 23606  Email:  freyberg at jlab.org
>>
>>
>>     
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