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<== Date ==> <== Thread ==>

Subject: Re: Bergoz LR-BPM Monitoring system for LINAC
From: Kazuro FURUKAWA <[email protected]>
To: "K.M Ha" <[email protected]>
Cc: [email protected]
Date: Wed, 06 Aug 2008 07:01:25 +0900
Hello, 

>>> On Mon, 04 Aug 2008 12:03:51 JST,  "K.M Ha" <[email protected]> wrote;
>  
> Dose any one has an experience of Bergoz 500 MHz LR-BPM for the Linac Beam
> position monitoring?
>  
> Our Linac installed over 20 sets LR-BPM on the BTL section.
> Now we are consider how to integration of monitoring system. (ex, ADC board,
> external trigger or beam trigger .)

Once we tried Bergoz (200MHz or 500MHz), but we had difficulties in 
the hardware stabilities and triggering, etc.  (And I've heard a 
rumor he retired?)  Also, we wanted to read each electrode for the 
beam charge as well as the position, and for the higher-order beam 
profile analysis.  Instead, at KEK Linac we decided to utilize 
Windows/EPICS embedded oscilloscopes DPO7104, directly connected to 
the BPM signals, which enables 50Hz read-out as well.  You may loose 
a precision and/or a dynamic range, which can be important for FEL 
machines, etc.  But for the BT line it may be OK.  If the bunch is 
short or single, one oscilloscope may cover many BPMs in time 
direction with rf combiners.  

Another solution which employed log. amp. like Bergoz but with 3GHz 
was done at Spring8. 

> I am waiting any help!

Sorry for no direct answer.  Best regards. 

> Thanks,
> Kiman Ha,
> Pohang Light Source 

-----
Kazuro FURUKAWA <[email protected]>
 Linac&KEKB,  High Energy Accelerator Research Organization (KEK), Japan
 Telephone: +81-29-864-5200 x4316,  Facsimile: +81-29-864-0321


References:
Bergoz LR-BPM Monitoring system for LINAC K.M Ha

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