Comments on: Ready… Aim… Trigger! http://www.quantumdiaries.org/2009/08/05/ready-aim-trigger/ Thoughts on work and life from particle physicists from around the world. Fri, 24 May 2013 07:05:48 +0000 hourly 1 http://wordpress.org/?v=3.5.1 By: Regina http://www.quantumdiaries.org/2009/08/05/ready-aim-trigger/#comment-3813 Regina Thu, 27 Aug 2009 08:47:40 +0000 http://blogs.uslhc.us/?p=1763#comment-3813 Hi Git,

I assume you mean employing a “trigger” on the simulated data. That is usually just done with things like energy or momentum cuts (what is essentially what a trigger does). It would probably be best to talk to trigger people in the experiment you’re associated with, I don’t know of any specific software trigger included in say Pythia.

Regina

]]> By: git http://www.quantumdiaries.org/2009/08/05/ready-aim-trigger/#comment-3812 git Wed, 19 Aug 2009 11:57:00 +0000 http://blogs.uslhc.us/?p=1763#comment-3812 Well, and what about software triggers, do you use some? As I understand it’s neccesary to have some in order to design the hardware ones.

The problem is to apply the software trigger to the MC simulators (Pythia for example), but I don’t manage to find any yet. Maybe know some?

oleksandr gituliar

]]> By: Regina http://www.quantumdiaries.org/2009/08/05/ready-aim-trigger/#comment-3811 Regina Thu, 13 Aug 2009 09:28:08 +0000 http://blogs.uslhc.us/?p=1763#comment-3811 Hi Harbles,

Excellent question. We do design triggers for specific running needs. Although I don’t know the specifics about how we will change them for the upcoming run, we will definitely maximize our computing capabilities.

I know for the cosmic runs we designed special triggers for cosmic rays. They had a much lower threshold than the triggers we’ll use for collision data and also had specific fiducial requirements since in general, cosmic rays don’t go through the interaction point.

I hope this answers your question!

Regina

]]> By: Harbles http://www.quantumdiaries.org/2009/08/05/ready-aim-trigger/#comment-3810 Harbles Sat, 08 Aug 2009 16:18:35 +0000 http://blogs.uslhc.us/?p=1763#comment-3810 I have a question about the trigger system. Will the trigger parameters be the same for the 1/2 design energy and likely 1/100th design luminosity run coming up as they would be if running at full energy and luminosity?
I imagine there will be far fewer events at the lower energy and luminosity so the computer system would have some unused capacity to record less interesting events. So would the trigger parameters be relaxed to capture more events for calibration purposes?

Also are the trigger parameters set the same above for the cosmic ray data taking or are they opened up to capture these relatively rare events?

]]> By: Colin Bembridge http://www.quantumdiaries.org/2009/08/05/ready-aim-trigger/#comment-3809 Colin Bembridge Thu, 06 Aug 2009 20:59:11 +0000 http://blogs.uslhc.us/?p=1763#comment-3809 Interesting.
Not much talk about the fine points of the actual operation of the collider. The only really detailed talk that I have seen was by Dr. Thomas Junk, on the fine tuning of LEP from way back in 2001. Really intersting talk, gives us outsiders some insight into the complexity of a modern high energy collider. Amazing how the team squeezed every last ounce (er.. gram) of performance from the machine before it was (reluctantly) shut down for conversion to the LHC.
Definitely worth a listen, here’s the link to the talk onthe KITP site.

Searches for the Higgs Boson at LEP:
http://online.kitp.ucsb.edu/online/colloq/junk1/

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