[Crater-team] When is next CRaTER telecon?

Wed Dec 19 14:55:28 EST 2018

Hello—

                Nobody was on the telecon today, and I presume the next two Wednesdays, being the days after two holidays, are off; does that mean our next call will be on January 9?  That’s the day after the LPSC abstract deadline; which of us are going?

                I am picking up the pieces after AGU; I hadn’t forgotten that I was going to look at D3/D4 side penetrators, but I plan to get that together today.  I was not able to complete all the stripping and processing of my simulation results about variations in lunar albedo; the last big piece is to assemble the analysis of the effect of slope on albedo, which I am working on now.  With that, and a couple of final tweaks (adding GCR Z>2 results to H/He in some plots), I’ll have everything I was planning to put in the paper.  After that I will port my ancient (2010) sensor response code to the newest version of Geant4 and re-run it with more particle species, more statistics, and better physics; this will set me up for a revisit of albedo doubles background subtraction (e.g., I’d really like to explain some of the ad hoc stuff like the altitude correction) and LET spectrum background subtraction, which I have been meaning to do for some years now.

Enjoy whatever break you have time for over the holidays!
--Mark

p.s. Can I get an enumeration of crater-team at lists.sr.unh.edu<mailto:crater-team at lists.sr.unh.edu>? I don’t want to use it blindly and clutter the in-boxes of people not interested in down-in-the-weeds background subtraction…

Mark D. Looper
Space Sciences Department
The Aerospace Corporation
M/S M2-260
P.O. Box 92957
Los Angeles, CA 90009-2957
Mobile: 310-529-3406
Voicemail: 310-336-6302

From: Mark D Looper <mark.d.looper at aero.org>
Date: Saturday, December 8, 2018 at 3:26 PM
To: Anthony Case <tonycase at cfa.harvard.edu>
Cc: Harlan <spence at guero.sr.unh.edu>, "crater-team at lists.sr.unh.edu" <crater-team at lists.sr.unh.edu>
Subject: Re: [Crater-team] CRaTER Side Shielding

Hello—

                Yes – I’ll look at them on the airplane and/or in the hotel.

See you next week—
--Mark

Mark D. Looper
Space Sciences Department
The Aerospace Corporation
M/S M2-260
P.O. Box 92957
Los Angeles, CA 90009-2957
Mobile: 310-529-3406
Voicemail: 310-336-6302

From: Anthony Case <tonycase at cfa.harvard.edu>
Date: Thursday, December 6, 2018 at 11:12 AM
To: Mark D Looper <mark.d.looper at aero.org>
Cc: Harlan <spence at guero.sr.unh.edu>, "crater-team at lists.sr.unh.edu" <crater-team at lists.sr.unh.edu>
Subject: Re: [Crater-team] CRaTER Side Shielding

Mark,

In comparing with GOES, we were curious about he response to >50 MeV protons, since GOES has a data product that is integral flux above 50 MeV.  Specifically, we were wondering if 50 MeV protons could make it through the side of the instrument into D3/D4. In looking at the mechanical design, it seemed like there were some paths where protons with energies less than 50 MeV (maybe even down to 30 MeV) could make it through to the detector.  Do you have model runs that would answer that question?

Tony

---------------------------------------------------------------------

Anthony Case

Astrophysicist

High Energy Astrophysics Division (HEAD/SSXG)

Center for Astrophysics | Harvard & Smithsonian

Cell: (617) 304 0768

60 Garden Street | MS 58 | Cambridge, MA 02138

On Thu, Dec 6, 2018 at 4:02 PM Mark D Looper <mark.d.looper at aero.org<mailto:mark.d.looper at aero.org>> wrote:
Hello—

                I’m sorry I missed the call yesterday because of Aerospace AGU dry runs at the same time.  What is the specific question about side penetrators that was asked?  I can dig response functions vs. energy and angle out of my 2010 sensor-head simulations, though I’ll probably have to do it from my hotel room at AGU.  I do intend to port the code to the current version of Geant4 and re-run it, for use in the paper after the one containing the work I’m summarizing on the AGU poster, but for protons the results won’t change much.

--Mark Looper

Mark D. Looper
Space Sciences Department
The Aerospace Corporation
M/S M2-260
P.O. Box 92957
Los Angeles, CA 90009-2957
Mobile: 310-529-3406
Voicemail: 310-336-6302

From: Crater-team <crater-team-bounces at lists.sr.unh.edu<mailto:crater-team-bounces at lists.sr.unh.edu>> on behalf of Harlan Spence <spence at guero.sr.unh.edu<mailto:spence at guero.sr.unh.edu>>
Date: Thursday, December 6, 2018 at 10:53 AM
To: Anthony Case <tonycase at cfa.harvard.edu<mailto:tonycase at cfa.harvard.edu>>
Cc: "crater-team at lists.sr.unh.edu<mailto:crater-team at lists.sr.unh.edu>" <crater-team at lists.sr.unh.edu<mailto:crater-team at lists.sr.unh.edu>>
Subject: Re: [Crater-team] CRaTER Side Shielding

I love it when a plan comes together.  We meant to do that!  I guess it was in the instrument paper for a reason….too many years now.
________________________________
Harlan E. Spence
Director, Institute for the Study of Earth,
   Oceans, & Space and Prof. of Physics
Morse Hall, Room 306
University of New Hampshire
8 College Road
Durham, NH 03824-3525

Phone: 603-862-0322
Fax:   603-862-1915

http://www.eos.unh.edu/Faculty/Spence
________________________________

On Dec 6, 2018, at 2:36 PM, Anthony Case <tonycase at cfa.harvard.edu<mailto:tonycase at cfa.harvard.edu>> wrote:

Since we were discussing the possibility of side-penetrators yesterday, I went back and looked at the solid model for the instrument to see how much shielding is on the sides of the detectors.  There are a couple images attached.  The outer wall of the telescope housing is 0.2 cm, and the added shielding was essentially a C-channel with 0.2cm walls that was bolted onto the outside of the telescope housing.  So for normally incident particles there is just the end-caps which are 0.076 cm (which gives us our usual ~10-12 MeV protons required to get into the instrument).  And for side-penetrators to get through a 0.4cm thick wall requires about 27.5 MeV.  That neglects the detector frame, which could add another >0.5 cm.  Of course any particular particle's path through all of this junk is fairly complex, but roughly speaking 30-50 MeV seems like the minimum energy a side-penetrating proton would need to reach the detector.

<image.png>

<image.png>

---------------------------------------------------------------------
Anthony Case
Astrophysicist
High Energy Astrophysics Division (HEAD/SSXG)
Center for Astrophysics | Harvard & Smithsonian
Cell: (617) 304 0768
60 Garden Street | MS 58 | Cambridge, MA 02138
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