Search found 14 matches

by ferar
Wed Nov 15, 2017 1:12 am
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 10330

Re: 2017 Operation

Gruffalo has woken up? What that means? Anyone knows?

Thanks
fernando
by ferar
Wed Dec 07, 2011 12:39 am
Forum: The Accelerator
Topic: 2011 Events Discussion
Replies: 184
Views: 35010

Re: 2011 Events Discussion

Hello. What was the luminosity target for 2011 ion run?
Thanks
fernando
by ferar
Sat Sep 17, 2011 5:40 pm
Forum: The Accelerator
Topic: Tine and Losses Panel in vistars
Replies: 5
Views: 1961

Re: Tine and Losses Panel in vistars

The following is just my understanding of what you ask, someone please correct me if I am totally off-track. You can find excellent description of the tune here among other beam parameters. Vertical position of the tune dot represents measured vertical tune and horizontal position of the dot the ho...
by ferar
Mon Sep 12, 2011 5:36 pm
Forum: The Accelerator
Topic: Tine and Losses Panel in vistars
Replies: 5
Views: 1961

Tine and Losses Panel in vistars

Hello, looking at the vistars (meltronx.com) in one of the LHC dashboard panels you can see Tune and Losses. I tried but could not understood some of the panels, if someone is so kind to explain It will be very welcomed. http://lhclite.meltronx.com/dash.html How Tune is read? Why are there multiple ...
by ferar
Tue Jun 28, 2011 1:10 pm
Forum: The Accelerator
Topic: Have two consecutive programmed fills ever been achieved?
Replies: 9
Views: 1944

Re: Have two consecutive programmed fills ever been achieved

Crossing fingers seems that fill #1900 and #1901 will do that. Fill #1900 ended up with Programmed Dump, and #1901 is on its way.
by ferar
Tue Jun 21, 2011 1:54 am
Forum: The Accelerator
Topic: Luminosity vs. number of collisions
Replies: 4
Views: 1634

Luminosity vs. number of collisions

Hi, I was wondering if there is any way of calculate number of collision per second for example based on luminosity. Is this possible?
I read somewhere that there are about 13 collisions per bunch, is this correct? Are there any LHC Vistar with this information?
Thanks very much.
Fernando
by ferar
Thu Jun 09, 2011 1:37 am
Forum: Science
Topic: Proton mass increase
Replies: 7
Views: 5284

Re: Proton mass increase

Thanks very much for the detailed answer. Really appreciate it, it is a very interesting (and sometimes confusing) topic for me (no physics beyond high school). It is much clear now.
by ferar
Sat Jun 04, 2011 3:08 pm
Forum: Science
Topic: Proton mass increase
Replies: 7
Views: 5284

Re: Proton mass increase

Thanks very much Zaim. But regarding the last questions, do the size (diameter) increase with the relativistic mass increase?
Thanks!
by ferar
Sat Jun 04, 2011 3:29 am
Forum: Science
Topic: Proton mass increase
Replies: 7
Views: 5284

Proton mass increase

AFAIK when particles accelerate, their mass increase. Do you know how many times proton mass is increased at the LHC at 3.5 TeV? Do only the mass increase or also the size of the proton increase as well? If yes, does it means that at higher energies (7 TeV) collision ratio should increase by the siz...
by ferar
Fri Oct 08, 2010 2:25 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 63173

Re: Current Events Discussion

Hi, why is Atlas BGND2 so big (it reads 1454 now) compared to CMS (1.710)? In wich unit is it meassured? And the difference between BGND #1, 2 and 3?
Thanks very much!
Regards;
Fernando
by ferar
Thu Sep 30, 2010 11:30 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 63173

Re: Current Events Discussion

What does UFO #xx means? Seems it is causing beam dumps.
Thanks
Fernando.
by ferar
Fri Jul 30, 2010 2:55 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 63173

Re: Current Events Discussion

Hi, I see that about 20% of the beam is lost (It started at 2.5E12 and now it is ~2.0E12). Is this caused by collisions? Is it safe to loss this amount of particles?
Thanks
Fernando.
by ferar
Mon May 10, 2010 2:48 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 63173

Re: Current Events Discussion

Hi, where can you see the collision's rate and the number of collisions?
Thanks very much.