5% loss on rampup?

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jmc2000
Posts: 160
Joined: Sun May 08, 2011 2:51 pm

5% loss on rampup?

Post by jmc2000 » Sun May 13, 2012 5:18 pm

During rampup, I've noticed that the beam currents reduce by around 5% which means the same loss in luminosity. Has this effect always been at around the 5% mark?

Kasuha
Posts: 570
Joined: Tue Dec 15, 2009 1:22 pm

Re: 5% loss on rampup?

Post by Kasuha » Mon May 14, 2012 8:54 am

No that shouldn't be happening but their primary objective is delivering luminosity so whatever doesn't completely stop them from that will get polished on the fly.

jmc2000
Posts: 160
Joined: Sun May 08, 2011 2:51 pm

Re: 5% loss on rampup?

Post by jmc2000 » Tue May 15, 2012 11:58 pm

Now at 5.5/nb/s and losses during ramp-up barely visible which is great news.

jahonen
Posts: 7
Joined: Wed Sep 07, 2011 6:03 pm

Re: 5% loss on rampup?

Post by jahonen » Sat May 19, 2012 2:18 pm

They are using tighter collimator settings this year, so loss is more sensitive to the transverse beam size. Latest fills seem to behave better, I believe there were some issues with the injectors after last TS.

Regards,
Janne

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