Dear Vittorio,
Thanks for your patient reply.
1. My simulation goal mainly has two aspects. One is to simulate the detector response in a beam loss situation, either assuming a point loss,a uniform loss(these loss patterns are indefinite and only based on some reasonable assumptions) or a definite loss(loss on a dump), however, response simulations could be compared to the experimental measurements. The other goal is to study which particle in radiation field generated by beam loss has the higher contribution to the BLM signal, which is mainly limited to a theoretical research and could provide useful informations for the detector optimization.
2. In fact, I am not very sure what should be specially concerned in the FLUKA simulation of ionization chamber response, e.g., setting in the DEFAULT card, EMFCUT card, THRESHOLD card, PHYSICS card, or any relevant card. Could you give me some suggestions in the card setting by looking at the input file in the last email?
Best regards,
Yang.
-----原始邮件-----
发件人: "Vittorio Boccone" <dr.vittorio.boccone_at_ieee.org>
发送时间: 2016年11月27日 星期日
收件人: "YANG Tao" <yangt_at_ihep.ac.cn>
抄送: "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
主题: Re: [fluka-discuss]: Contribution of different particles to the detector signal !
Dear Yang,
ok, thank you for the detail. So we are talking about ionisation detector used a beam loss monitors. Now I would need to now which is the goal of your simulation.
Attachment is the ionization-chamber-type detector model, the region named "detector"(filled with Ar+ nitrogen mixed gas) is defined as the sensitive volume. I simply simulate the detector response to a beam loss and find which particle in the mixed radiation field(generated by beam loss on tube) has a main contribution to the detector signal.
The word “simply” above means you are using approximations. If you one want a very realistic simulation one should add all the detector simulation processes. If you need to study which particle type of the of your radiation field has the higher contribution to the BLM signal you need to study the radiation field spectra and fluencies at the BLM position.
"Another option could be define a special material for the detector and to change the electron generation and transport threshold: in this way all the energy deposition will be attributed to the particle which first interact in the detector."
What is "a special material" mentioned above? BLACKHOLE? And electron generation and transport threshold, i.e., setting in the EMFCUT card, but what value is to be set? Based on what is considered?
No not the BLACKHOLE. Just one could redefine another material or region for the detector active volume where threshold for generation and transport are different. Forget about this case it won’t help you much with this specific detector case.
An option could be to select the contribution of a specific particle type is to write a usurped routine as suggested try Roberto
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/9680.html
but in your case WEE will be “ONEONE” only for the particle type you want to study and zero for everything else.
Again, now I know your detector but not your simulation goal…
I think the detector geometrical effects cannot be ignored. In the simulated detector response to specific particle, response should also correspond to a specific incident angle as shown in the response function of LHC beam loss monitors(attached file: ResponseF.pdf).
Well, it depends your simulation goal. You probably went through the bibliography of the LHC BLM response study technical note you sent me, so you looked at Markus Stockner thesis.
In both cases shown by the paper they study the response of the detector but they don’t give you the details about how this was done. It’s an LHC technical note not an article.
Best,
Vittorio
--
杨涛
中科院高能所东莞分部（东莞中子科学中心）加速器技术部
地址：东莞市大朗镇中子源路1号中国散裂中子源A2栋606室
E-mail：yangt_at_ihep.ac.cn
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Received on Sun Nov 27 2016 - 17:26:47 CET