machine correction, optimization and statistics

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michael_borland
Posts: 1801
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
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Re: machine correction, optimization and statistics

Post by michael_borland » 20 Aug 2021, 16:01

Marco,

I don't see the attachment (except for the figures). Can you trying posting it again?

--Michael

marlibgin
Posts: 54
Joined: 15 Mar 2011, 12:43

Re: machine correction, optimization and statistics

Post by marlibgin » 20 Aug 2021, 16:08

Sorry Michael
my mistake I think, sure I had put it. I am attaching it now

Marco
Attachments
ERRORS_MISALIGNMENTS3.tar.gz
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michael_borland
Posts: 1801
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
Contact:

Re: machine correction, optimization and statistics

Post by michael_borland » 20 Aug 2021, 18:16

Marco,

I correct the closure of the ring to higher accuracy,but it didn't help.

I also found a CSBEND with SYNCH_RAD=1, in spite of the presence of an SREFFECTS element. This didn't solve the problem either.

Next, I reduced the number of misalignments to DX and DY on the QF elements, then use QFs for steering. The orbit was corrected to much smaller levels, basically zero at the BPMs. My conclusion is that there are too many error sources for the limited number of correctors you have.

--Michael
Attachments
closeRing.ele
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marlibgin
Posts: 54
Joined: 15 Mar 2011, 12:43

Re: machine correction, optimization and statistics

Post by marlibgin » 28 Aug 2021, 18:03

Thanks a lot Michael to look into this. It is an interesting finding and I need to understand it in detail.

Marco

marlibgin
Posts: 54
Joined: 15 Mar 2011, 12:43

Re: machine correction, optimization and statistics

Post by marlibgin » 07 Sep 2021, 06:51

Indeed your conclusion is correct. I have double checked with AT2 and the absence of one VCM at the head of the achromat is responsible for the residual seen in the vertical plane. So thanks again to check this, it was very instructive

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