Hi,
This is fine until we have the ABS software. As Michael noted;
for the false asymmetry extraction, we prefer to have -exactly-
the same operating conditions.
I have two remarks about the script:
1) Although, you set the target state to 0 while changing the
bits, this will have no effect in practice. CA (epics
channel access) library is a highly optimized - good design -,
and it will most likely deliver the commands in the right order
but at the same time (same epics update interval) to the
ABS.STATUS channel. Thus, the change in status will be done
instantly on all bits for all practical purposes, without
any status-0 target.
To mimic the ABS operation (I assume this should be the aim),
put a delay after setting the status bit to 0. Is is something
like 5 sec? (attached the changed script)
2) Isn't the ABS transition sequence quasi-random? If so,
same algorithm is desirable for this script, rather than
linear change sequence.
Taylan
On Apr 16, 2005, at 3:57 PM, Akihisa Shinozaki wrote:
> Hello there,
>
> I made a simple shell script to flip the spin bits. I have not run
> the script on one of the dblast machines because I do not want to
> screw things up. It flips the bits every 10 minutes. Every 10
> minutes, the script flips from state 1,6> to 2,5> or 2,5> to 3,4>
> or 4,5> to 1,6>. During the flip, the target status bit (6) is set
> to 0. I think I need someones approval before I run this thing.
> What do you think?
>
> Thank you so much,
> aki
>
> Taylan Akdogan wrote:
>
>
>>
>> On Sat, 16 Apr 2005, Michael Kohl wrote:
>>
>>
>>>> - Had to change the ABS states manually, because ABS software
>>>> was not running.
>>>>
>>>>
>>>>
>>> Just as a comment,
>>>
>>> if we want any confidence on false asymmetries measured with the
>>> unpolarized system, we need to run the experiment in the same way
>>> like with the ABS, i.e. with the ABS software (even if the ABS
>>> software only uses the commands to set the spin bits that Taylan
>>> invoked manually).
>>>
>>> Otherwise, the unpolarized running is only good for the
>>> luminosity check.
>>>
>>> Regards,
>>>
>>> Michael
>>>
>>>
>>
>>
>> I agree. I should have been more informative about this in the
>> shift summary: Because of the SFT problem, Genya didn't want to
>> turn on ABS RF, so didn't want to run the ABS software. (elog 34974)
>>
>> I'm sure, we can/will use the ABS software for future unpol runs
>> as was used in the past, once it's fixed.
>>
>> Taylan
>>
>> --
>> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>> Taylan Akdogan Massachusetts Institute of Technology
>> akdogan@mit.edu Department of Physics
>> Tel: +1 (617) 258-0801 Laboratory for Nuclear Science
>> Fax: +1 (617) 258-5440 Room 26-559
>> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>>
>>
>>
>> <test.sh>
>
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