[Sbs] Fwd: Re: Injector question

[Alexandre Camsonne]

---------- Forwarded message ----------
From: "Joseph Grames" <grames at jlab.org>
Date: Dec 11, 2013 9:48 AM
Subject: Re: Injector question
To: "Alexandre Camsonne" <camsonne at jlab.org>
Cc: "Matt Poelker" <poelker at jlab.org>, "Riad Suleiman" <suleiman at jlab.org>

Hi Alexandre,

Do you have some idea of the radiation you desire?   For example, x-rays of
what energy?  How much of a dose?  Nearly all of our dumps are shielded, so
it may be possible but details would help, e.g. how big are crystals, how
much does is needed, is there a maximum dose you worry about, etc.  Perhaps
it's possible to do a beam test where we "load" a crystal at a dump,
purposely dose it for X, then remove.  Then there is no permanent
reconfiguration of shielding or calibration of BLM's, etc.

Yes, John has done some really great things lately finding ways to easily
reduce the rep rate of the laser, while maintaining good average laser
power and beam quality.  This is not at all like the BFM where beam was
chopped and as a result average current and bunch quality suffered.
 Rather, the new method relies on dividing a top frequency by factors of 2.
 So, e.g., one can start with 998MHz, to provide 499, 249.5, 124.75,
62.375, 31.1875, and lowest attempted, 15.59375 MHz, which starts to become
an issue with the fiber amplifier we presently use.

What's your idea/need?

Joe

----- Original Message -----
From: "Alexandre Camsonne" <camsonne at jlab.org>
To: "Matt Poelker" <poelker at jlab.org>, "Riad Suleiman" <suleiman at jlab.org>,
"Joe Grames" <grames at jlab.org>
Sent: Wednesday, December 11, 2013 9:38:49 AM
Subject: Injector question








Hello,

I have two questions about the injector.

We are looking at curing of calorimeter blocks so we would need to
irradiate a few blocks and try to recover them using different light
wavelength.
Do you think there would be any possibility to put one block in the
injector dump from time to time if you are doing injector tests ? Would
have to check with radcon about radiation but if we could get onsite
irradiated blocks that would be very useful for our tests.

Also there was some mentioned of the possibility of changing the beam
structure more easily with the new laser, I think John mentioned that at a
meeting at some point. Will that still be a possibility ? What frequency
would be available ? 250 MHz 125 MHz, lower ?

Thank you,

Alexandre
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