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| dm_task_force:whitepaper [2013/02/01 15:40] – prisca | dm_task_force:whitepaper [2013/09/11 09:38] (current) – [III. The simulation challenge.] chao.zhang |
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| | ===== Draft 3 of Paper ===== |
| | {{:dm_task_force:depthdraft3.pdf|pdf with assignments}} |
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| ===== Outline for Depth Working Group Report ===== | ===== Outline for Depth Working Group Report ===== |
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| ==== I. Introduction ==== | ==== I. Introduction ==== |
| ==== II. Existing Measurements of Underground Neutron Backgrounds ==== | ==== II. Existing Measurements of Underground Neutron Backgrounds ==== |
| Traditionally, underground experiments estimate their neutron backgrounds using extensive simulation normalized to a handful of events in their well-shielded target mass. This leads to large error bars and systematic uncertainties between technologies. A better strategy is to choose a few experiments which are uniquely sensitive to aspects of CMINB and use them to improve the physics and implementation of the simulation package(s) used by all experiments. The current status of these experiments is outlined below. | Traditionally, underground experiments estimate their neutron backgrounds using extensive simulation normalized to a handful of events in their well-shielded target mass. This leads to large error bars and systematic uncertainties between technologies. A better strategy is to choose a few experiments which are uniquely sensitive to aspects of CMINB and use them to improve the physics and implementation of the simulation package(s) used by all experiments. The current status of these experiments is outlined below. |
| * Older Results from LSD and LVD {{:dm_task_force:old-lvd-lsd_vitaly_pcedit.doc|Finalized text: Monica, Vitaly, Prisca}} In good shape. | * Older Results from LSD and LVD: {{:dm_task_force:old-lvd-lsd_vitaly_pcedit.doc|Finalized text: Monica, Vitaly, Prisca}} In good shape. |
| * New Results from LVD {{:dm_task_force:lvd_vitaly_pcedit-vk.doc|Monica, Vitaly, Prisca}} Finished, except any new results from LVD | * New Results from LVD: {{:dm_task_force:lvd_vitaly_pcedit-vk.doc|Monica, Vitaly, Prisca}} Finished, except any new results from LVD |
| * Borexino: No text. Tony Empl add | * Borexino: {{:dm_task_force:borexino_empl_pcedit.docx|Text by Toni with edits by Prisca}} Needs either new results or allowable details |
| * Zeplin II/Boulby {{:dm_task_force:zeplin2_vitaly_edited.doc|Text mostly by Vitaly K}} Prisca edited and added parts from Monica | * Kamland: Who will do this? |
| | * Zeplin II/Boulby: {{:dm_task_force:zeplin2_vitaly_edited.doc|Text mostly by Vitaly K}} Prisca edited and added parts from Monica |
| * Edelweiss/LSM: {{:dm_task_force:lsm_vk_pcedit.doc|Text mostly by Vitaly}} Prisca edited. More details may be included if new results. | * Edelweiss/LSM: {{:dm_task_force:lsm_vk_pcedit.doc|Text mostly by Vitaly}} Prisca edited. More details may be included if new results. |
| * SNO: (Andrew) No text yet. | * SNO: (Andrew) No text yet. |
| - Description of the Groom Parameterization and the parameter choices made by Mei&Hime **(Andrew)** | - Description of the Groom Parameterization and the parameter choices made by Mei&Hime **(Andrew)** |
| - Summary of measurements made in caverns.=> **(Chao)** | - Summary of measurements made in caverns.=> **(Chao)** |
| * partial text by Chao on using {{:dm_task_force:wp_muons_mh.docx|some scaling applied to muons vs depth}} | * partial text by Chao on using {{:dm_task_force:wp_muons_mh.docx|some scaling applied to muons vs depth}}{{:dm_task_force:homestake_measurement_summary_chao.docx|summary of muon measurement (Chao)}} |
| - Description of the MUSUN program and how it works **(Vitaly)** | - Description of the MUSUN program and how it works {{:dm_task_force:musun_combined_vk_pc.doc|Prisca combined VK texts and edited}} |
| | * above includes uncertainties due to rock density/composition/distribution |
| - Comparisons with Groom parameterization vs MUSUN simulations. | - Comparisons with Groom parameterization vs MUSUN simulations. |
| * MUSUN results from Boulby and Gran Sasso and how they improved things**(Vitaly)** | * MUSUN results from Boulby and Gran Sasso and how they improved things**(Vitaly)** |
| * MUSUN vs Groom at Soudan (and Homestake, if we have info) **(Angie)** | * MUSUN vs Groom at Soudan (and Homestake, if we have info) **(Angie)** |
| * Extract some general statements from the previous sections to answer: | - Comparison of doing muons thru geant vs MUSUN => **(Chao)** {{:dm_task_force:comparison_geant4_vs_musun_v2.docx|Edited Summary}}{{:dm_task_force:comparison_geant4_vs_musun_v3.docx|update Version 3}} |
| * How does rock composition enter into uncertainty? | {{:dm_task_force:comparison_geant4_vs_musun_v4.docx|update Version 4}} |
| * How does slant path (overburden) enter uncertainty? | {{:dm_task_force:comparison_geant4_vs_musun_v6.docx|update Version 6}} |
| - Comparison of doing muons thru geant vs MUSUN => **(Chao)** {{:dm_task_force:comparison_geant4_vs_musun_v2.docx|Edited Summary}} | |
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| === C. Muon-induced Secondaries underground === | === C. Muon-induced Secondaries underground === |
| - Intro: Start with general description of secondary processes and what is involved. | - Intro: Start with general description of secondary processes and what is involved. [AV: I think we should be very specific about the models here, it's not always clear to people how these processes are executed, and it matters since people might have better ideas or at least be aware of deficiencies in the microscopic physics ] |
| - Compare and contrast how well the Simulations matched data in the experiments called out in II, identifying the differences and problems. For now, just make sure such details are in II, so we can write a summarizing paragraph here later. | - Compare and contrast how well the Simulations matched data in the experiments called out in II, identifying the differences and problems. For now, just make sure such details are in II, so we can write a summarizing paragraph here later. |
| - Parameterizing Results **(Andrew will write a short intro to Mei & Hime methodology)** | - Parameterizing Results **(Andrew will write a short intro to Mei & Hime methodology)** |
| * Some text and plots from {{:dm_task_force:wppartgen.docx|Variation in Particle Generation with Muon Energy}} may fit here | * Some text and plots from {{:dm_task_force:wppartgen.docx|Variation in Particle Generation with Muon Energy}} may fit here |
| - Status and Outstanding Issues: Explain where sims work well and where they don’t. What fits M&H and what doesn’t. | - Status and Outstanding Issues: Explain where sims work well and where they don’t. What fits M&H and what doesn’t. |
| - New Advances in Geant and FLUKA. | - New Advances in Geant and FLUKA.{{:dm_task_force:geant4_fluka_nyield.docx|Proposed text by Melinda}} {{:dm_task_force:geant4_fluka_nyield_avupdate.docx|Updates and comments by Anthony}} |
| * a. Geant4: more neutrons and improved multiplicity (Angie, Soudan Geant4). Muon production of neutrons in scint and lead (Melinda or Anthony) | * a. Geant4: more neutrons and improved multiplicity (Angie, Soudan Geant4). Muon production of neutrons in scint and lead (Melinda or Anthony) [AV: I think this should be pretty specific about the updates to the models building off of what is in the intro to this section] |
| * b. Fluka: What has changed in FLUKA since M&H? Tony | * b. Fluka: What has changed in FLUKA since M&H? Tony |
| * c. Comparing Geant4 and FLUKA: In terms of muon-induced neutrons (Anthony, Melinda, Tony). In terms of direct comparison at Homestake (Angie, using Raul's FLUKA files) | * c. Comparing Geant4 and FLUKA: In terms of muon-induced neutrons (Anthony, Melinda, Tony). In terms of direct comparison at Homestake (Angie, using Raul's FLUKA files) |
| | * d. Comparing both to data, referencing experiments from the earlier section (where the experimental limitations are explained and cited in detail) |
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