NSRL Data Library for Run 08C

There are several projects making use of this Outgoing data directory.

• The NASA-JSC group can find there data file here.
• The SRI group data files are listed here.

This is the data repository for transferring data files out of NSRL.  It is organized by Run, Ion Species, Energy and Date.

For help in downloading this information, contact the NSRL Liaison Physicist. 

SRI Data

These file contain the Peak Sensing ADC values for the silicon stack and a  BGO crystal.  The event record looks llike this for files Fe_1000_30_9_2008_001 through Fe_1000_30_9_2008_007:

For files  Fe_1000_30_9_2008_006 onward, a 10kHz clock pulse was added to the event record.

All files are ascii, approximately 5 MBytes in length (runs 1-18) and 18MBytes (runs 19-26).

Note: the scalers are not reset, but accumulate through the experiment.

NASA-JSC Data

During the week of 13-15 October 2008, we ran Iron and Protons for two experiments from NASA-JSC.  The data acquisition was operated in two different configurations, labeled below as either Scaler or Spectrum/Timing.  When running in the Scaler mode, we accumulated the number of beam particles that passed through the two beam counting scintillators during a 4 second beam spill.  The scintillators had cross sectional area of 1.08 cm² and 10.28 cm², respectively.  During the runs, the small scintillator was upstream of the large scintillator.  Both were placed slightly above (~1cm) and downstream (~20cm) of the two JSC detectors.

In order to record the beam intensity to compare with the dosimetry, we operated in Scaler mode where scalers counted the number of beam particles seen by each scintillator, as well as counting a 10kHz clock pulse, and the number of beam spills.  These counts are accumulated in a scaler that is not resetting.  The scaler is read out once per spill (every 4 seconds), and the spill counter should increment with each record.  The files have a time stamp at the beginning and end of each file. 

Iron ion running is described first. 

When running in Scaler mode (runs 1-2), the event record has the following format:

In order to study the performance of the proportional counter, we split the signal with a passive splitter.  Half of the signal was differentiated using a pass-through capacitor into a discriminator operating at a -10 mV threshold.  The other half of the signal was delayed (~2 microseconds in cables) and sent to a Peak Sensing ADC (CAEN V785) for digitising.  This allowed us to get a look at the spectrum online. 

When running in Spectrum/Timing mode (runs 3-11), the event record has the following format:

 We also ran in a Timing only mode (runs 12-14) where no ADC information was taken, to study the distribution of Proportional Chamber triggers throughout the 300 millisecond long beam spill.  Both Word #1 and Word #3 are the 10 kHz clock pulse, but in Word #3 the scaler is reset at the beginning of every 4 second spill cycle.

The event record for Timing only runs has the following format:

For runs 15-17 we read out both the scaler and ADC.  The event record has the following format:

For runs 18-24 we added the scaler counts for the small and large scintillator to the event record. 

Although the event record was the same for runs 18-24, the mode of data taking was not.  In runs 18, 23 and 24 we were triggered by the Proportional Chamber for spectral measurements and event rate studies.  In Runs 19-22 the scalers were read out only once per spill in order to allow for comparison with the dosimetry results.

Proton running is described second.

For the proton running, the data format for all runs (except H_1000_15_10_2008_004.txt) is described as follows:

One proton run was taken to measure the pulse height spectrum and timing distribution (run 4).   It was read out whenever the Proportional Counter had a hit that passed a Discriminator Threshold.  This run had the following format:

 

Word Number	1	2	3	4	5	6	7	8
Word Type	Scaler	Scaler	Scaler	Scaler	Scaler	ADC	Scaler	TDC
Description	10 kHz clock	Large Scint	Small Scint	Coincidence	Spill Counter	Proportional Counter	10 kHz  clock (reset)	Ignore

All these data are still located on the analysis disk, along with some simple data analysis tools.  Contact the Liaison Physicist for assistance with downloading or analysis of these files.

Last Modified: October 20, 2008
Please forward all questions about this site to: Michael Sivertz

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