[Dlsupport] task list 06/28/2016

[David Douglas]

Which direction is the observer looking... at the direction from which 
the beam comes, or in the direction of beam motion?

Thanks!


On 7/11/2016 2:54 PM, Stephen Benson wrote:
> Just for information sake, the skew quads are rotated 45 degrees 
> counterclockwise from their normal quad orientation.
>
> Steve
>
> On Jul 6, 2016, at 8:49 PM, David Douglas <douglas at jlab.org 
> <mailto:douglas at jlab.org>> wrote:
>
>> oops... one other remark: in principle, the "parity" will be defined 
>> by the rotation angle of the skew quad, which is either +45 degrees 
>> or -45 degrees, looking either up-beam or down-beam... which 
>> translates into either positive or negative skew quad when a positive 
>> (horizontally focusing) normal quad is rotated.
>>
>> So, there are only 8 possible combinations for any particular code... ;)
>>
>>
>>
>> On 7/6/2016 10:59 AM, Michele Joyce wrote:
>>> Should this info be kept and maintained in the LED?
>>> Michele
>>>
>>> On 7/5/2016 12:26 PM, David Douglas wrote:
>>>>
>>>> Thanks Jim.
>>>>
>>>> Part of the need for the polarity check is to establish the 
>>>> "parity" of the skews (which differs between EPICS and codes). I 
>>>> don't want to introduce bias, but if we could measure the poletip 
>>>> field (with sign) of each quad and log it, we'll save time overall. 
>>>> I'll sketch up a procedure.
>>>>
>>>> Thanks
>>>>
>>>> D
>>>>
>>>>
>>>> On 7/5/2016 11:00 AM, Jim Coleman wrote:
>>>>> Hi Dave,
>>>>>  We haven't powered any of the 4F quads yet.  That will not happen 
>>>>> until the spool pieces are installed due to splitting of the 
>>>>> magnet. We have to perform a voltage/ current/ polarity 
>>>>> measurement of any magnet as part of the HCO. I'll make sure LCW 
>>>>> gets put on the skews.
>>>>> -Jim
>>>>>
>>>>>  On 7/5/2016 10:08 AM, David Douglas wrote:
>>>>>>
>>>>>> re: #2) - please put the results of the test into the LERFLog. Thanks
>>>>>>
>>>>>> D
>>>>>>
>>>>>>
>>>>>> On 7/5/2016 10:07 AM, David Douglas wrote:
>>>>>>>
>>>>>>> Hi Jim - don't know if the following was communicated to you or 
>>>>>>> not, but
>>>>>>>
>>>>>>> 1) Steve asked if the 10 additional skew quads needed water 
>>>>>>> cooling. Answer: if the other quads are run with water cooling, 
>>>>>>> these will need it as well. They run at the same fields as the 
>>>>>>> normal quads.
>>>>>>>
>>>>>>> 2) Has each quad been polarity checked (i.e. a Hall probe put on 
>>>>>>> each pole of each quad)? We need to be sure there are consistent 
>>>>>>> sign conventions through 4F, and I'll need to know what pole of 
>>>>>>> each quad is at what sign and field level when the usual +5A 
>>>>>>> test current is being run.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> DD
>>>>>>>
>>>>>>>
>>>>>>> On 6/30/2016 4:32 PM, Jim Coleman wrote:
>>>>>>>> apologies for sending it out late
>>>>>>>>
>>>>>>>>
>>>>>>>>
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>>>>
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