IAC LeadFlourideCherenkovCrystalTests - Revision history

Foretony: /* Radiation Exposure Tests in December for Hall A. */

2018-04-13T19:06:25Z

Radiation Exposure Tests in December for Hall A.

Foretony: /* Radiation Exposure Tests in December for Hall A. */

2018-04-13T19:06:01Z

Radiation Exposure Tests in December for Hall A.

Foretony: /* Radiation Exposure Tests in December for Hall A. */

2018-04-13T19:05:03Z

Radiation Exposure Tests in December for Hall A.

Foretony: /* Radiation Exposure Tests in December for Hall A. */

2018-04-13T19:04:23Z

Radiation Exposure Tests in December for Hall A.

Foretony: /* Radiation Exposure Tests in December for Hall A. */

2018-04-13T19:03:05Z

Radiation Exposure Tests in December for Hall A.

Foretony: /* Radiation Exposure Tests in December for Hall A. */

2018-04-13T18:07:14Z

Radiation Exposure Tests in December for Hall A.

Harpconn: /* Radiation Exposure Tests in December for Hall A. */

2018-04-13T17:54:39Z

Radiation Exposure Tests in December for Hall A.

Oborn: /* Analysis: */

2008-12-30T01:33:09Z

Analysis:

Oborn at 18:31, 25 April 2008

2008-04-25T18:31:48Z

Oborn at 01:35, 25 April 2008

2008-04-25T01:35:02Z

← Older revision		Revision as of 19:06, 13 April 2018
Line 33:		Line 33:
	<math>= 1.610^{-19}JA/e^- = 1.610^{-19}J\frac{C}{s}/e^-</math>		<math>= 1.610^{-19}JA/e^- = 1.610^{-19}J\frac{C}{s}/e^-</math>

−	<math>1.610^{-19}\frac{J\ C}{s cdot e^-} \frac{1 \ e-}{1.6*10^{-19}C} = 1 Watt</math>	+	<math>1.610^{-19}\frac{J\ C}{s \cdot e^-} \frac{1 \ e-}{1.6*10^{-19}C} = 1 Watt</math>

← Older revision		Revision as of 19:06, 13 April 2018
Line 33:		Line 33:
	<math>= 1.610^{-19}JA/e^- = 1.610^{-19}J\frac{C}{s}/e^-</math>		<math>= 1.610^{-19}JA/e^- = 1.610^{-19}J\frac{C}{s}/e^-</math>

−	<math>1.610^{-19}\frac{J\ C}{s}/e^- \frac{1 \ e-}{1.6*10^{-19}C} ~~/e^-~~= 1 Watt</math>	+	<math>1.610^{-19}\frac{J\ C}{s cdot e^-} \frac{1 \ e-}{1.6*10^{-19}C} = 1 Watt</math>

@@ Line 31: / Line 31: @@
 <math>\left ( \frac{20MeV}{e^-} \right)*0.05\mu A = \left ( \frac{20eV}{e^-} \right)*0.05A = 1 eV*A/ee^-</math>
-<math>= 1.6*10^{-19}J*A = 1.6*10^{-19}J*\frac{C}{s}</math>
+<math>= 1.6*10^{-19}J*A/e^- = 1.6*10^{-19}J*\frac{C}{s}/e^-</math>
-<math>1.6*10^{-19}\frac{J\ C}{s} * \frac{1 \ e-}{1.6*10^{-19}C} = 1 Watt</math>
+<math>1.6*10^{-19}\frac{J\ C}{s}/e^- * \frac{1 \ e-}{1.6*10^{-19}C} /e^-= 1 Watt</math>

@@ Line 29: / Line 29: @@
 -----
-<math>\left ( \frac{20MeV}{e-} \right)*0.05\mu A = 20eV*0.05A = 1 eV*A</math>
+<math>\left ( \frac{20MeV}{e^-} \right)*0.05\mu A = \left ( \frac{20eV}{e^-} \right)*0.05A = 1 eV*A/ee^-</math>
 <math>= 1.6*10^{-19}J*A = 1.6*10^{-19}J*\frac{C}{s}</math>

@@ Line 29: / Line 29: @@
 -----
-<math> 20MeV*0.05\mu A = 20eV*0.05A = 1 eV*A</math>
+<math>\left ( \frac{20MeV}{e-} \right)*0.05\mu A = 20eV*0.05A = 1 eV*A</math>
 <math>= 1.6*10^{-19}J*A = 1.6*10^{-19}J*\frac{C}{s}</math>

← Older revision		Revision as of 18:07, 13 April 2018
Line 33:		Line 33:
	<math>= 1.610^{-19}JA = 1.610^{-19}J\frac{C}{s}</math>		<math>= 1.610^{-19}JA = 1.610^{-19}J\frac{C}{s}</math>

−	<math>1.610^{-19}\frac{J\ C}{s} \frac{1 \ e-}{1.6*10^{-19}C} = 1 Watt~~\ e-~~</math>	+	<math>1.610^{-19}\frac{J\ C}{s} \frac{1 \ e-}{1.6*10^{-19}C} = 1 Watt</math>

← Older revision		Revision as of 17:54, 13 April 2018
Line 26:		Line 26:

	''P'' = (20 MeV) <math>\times</math> (0.05 <math>\mu</math>A) = 1 Watt.		''P'' = (20 MeV) <math>\times</math> (0.05 <math>\mu</math>A) = 1 Watt.
		+
		+	-----
		+
		+	<math> 20MeV0.05\mu A = 20eV0.05A = 1 eV*A</math>
		+
		+	<math>= 1.610^{-19}JA = 1.610^{-19}J\frac{C}{s}</math>
		+
		+	<math>1.610^{-19}\frac{J\ C}{s} \frac{1 \ e-}{1.6*10^{-19}C} = 1 Watt\ e-</math>
		+
		+
		+	-----

@@ Line 120: / Line 120: @@
 <b>Block 16 Data. </b> Blue light curing appears to be effective after 1st irradiation in  > 680 nm region. Blue light curing
-after the 2nd irradiation shows a significant decrease in the transmission coefficient; this effect is anomalous in comparison to the data for further samples.  All lines show a sharp increase around 550 nm.  Binned at 100: [[http://www.iac.isu.edu/mediawiki/index.php/Image:Block161cmavgbinnedat100.JPG]]
+after the 2nd irradiation shows a significant decrease in the transmission coefficient; this effect is anomalous in comparison to the data for further samples.  All lines show a sharp increase around 550 nm.  Binned at 100: [[http://wiki.iac.isu.edu/index.php/Image:Block161cmavgbinnedat100.JPG]]
 <center>[[Image:Block181cmavg.JPG]]</center>
-<b>Block 18 Data. </b> Blue light curing appears to be effective after 1st irradiation in > 680 nm region with no effect after 2nd irradiation.  All lines show a sharp increase around 550 nm.  Binned at 100: [[http://www.iac.isu.edu/mediawiki/index.php/Image:Block181cmavgbinnedat100.JPG]]
+<b>Block 18 Data. </b> Blue light curing appears to be effective after 1st irradiation in > 680 nm region with no effect after 2nd irradiation.  All lines show a sharp increase around 550 nm.  Binned at 100: [[http://wiki.iac.isu.edu/index.php/Image:Block181cmavgbinnedat100.JPG]]
 <center>[[Image:Block331cmavg.JPG]]</center>
-<b>Block 33 Data. </b> Blue light curing appears to be effective after 1st irradiation in > 680 nm region with no effect after 2nd irradiation.  All lines show a sharp increase around 550 nm.  Binned at 100: [[http://www.iac.isu.edu/mediawiki/index.php/Image:Block331cmavgbinnedat100.JPG]]
+<b>Block 33 Data. </b> Blue light curing appears to be effective after 1st irradiation in > 680 nm region with no effect after 2nd irradiation.  All lines show a sharp increase around 550 nm.  Binned at 100: [[http://wiki.iac.isu.edu/index.php/Image:Block331cmavgbinnedat100.JPG]]
 <center>[[Image:Block391cmavg.JPG]]</center>
-<b>Block 39 Data. </b> Blue light curing appears to be effective in all regions after both irradiations. Post-bleach lines show a sharp increase around 550 nm.  Binned at 100: [[http://www.iac.isu.edu/mediawiki/index.php/Image:Block391cmavgbinnedat100.JPG]]
+<b>Block 39 Data. </b> Blue light curing appears to be effective in all regions after both irradiations. Post-bleach lines show a sharp increase around 550 nm.  Binned at 100: [[http://wiki.iac.isu.edu/index.php/Image:Block391cmavgbinnedat100.JPG]]
@@ Line 152: / Line 152: @@
 References:
 [1] Roche, J.  How to do Transmission Measurements of the DVCS crystals.  Oct. 15, 2007.
 =References:=

← Older revision		Revision as of 18:31, 25 April 2008
Line 109:		Line 109:


−	Four measurements of each sample were made throughout this experiment. Crystals were irradiated with the 25 MeV LINAC at the Idaho Accelerator Center over intervals of 1, 2, and 4 hours. Each sample was ~~irradiated~~ and cured with blue UV light twice. Measurements of the intensity were taken after ~~irradiation~~, and after blue light curing just before the next ~~irradiation~~. Each measurement was made twice: once with the sample resting in its original position at the time of irradiation and again with the sample tilted 90 degrees. These two measurements were averaged together. Graphs shown on this page are moving average fits binned at 20 data points per bin. A link to graphs binned at 100 data points is provided under each graph for comparison.	+	Four measurements of each sample were made throughout this experiment. Crystals were irradiated with the 25 MeV LINAC at the Idaho Accelerator Center over intervals of 1, 2, and 4 hours. Each sample was exposed and cured with blue UV light twice. Measurements of the intensity were taken after exposure, and after blue light curing just before the next exposure. Each measurement was made twice: once with the sample resting in its original position at the time of irradiation and again with the sample tilted 90 degrees. These two measurements were averaged together. Graphs shown on this page are moving average fits binned at 20 data points per bin. A link to graphs binned at 100 data points is provided under each graph for comparison.
	<br>		<br>

← Older revision		Revision as of 01:35, 25 April 2008
Line 94:		Line 94:

	[[PbF2_CrystalNumber120R7]]		[[PbF2_CrystalNumber120R7]]
		+
		+	=Analysis:=
		+
		+	The following data is an analysis of the transmission coefficient for light incident on PbF2 crystals. The transmission coefficient is plotted as a function of wavelength. This value was evaluated using the following relationship found in Roche:
		+	<center>[[Image:equation.JPG]]</center>
		+	<br>
		+
		+	Where S( ) is the intensity spectrum of light through a PbF2 crystal at 1 cm along the length of the sample, B( ) is the intensity spectrum of the background, and R( ) is the intensity spectrum of unobstructed light. Spectra for light incident at 3 cm, 6 cm, 11 cm and 16 cm were also rendered at the time of the measurement; these have yet to be evaluated.
		+	<br>
		+
		+
		+	A Geant simulation of 20 MeV electrons impinging on a lattice of PbF2 shows that the majority of energy is deposited in the first centimeter of the sample. Since it was expected that most of the radiation damage would lie in this region, spectra rendered at 1 cm along the length of the sample were chosen for analysis before spectra rendered at further lengths.
		+	<br>
		+
		+
		+	Four measurements of each sample were made throughout this experiment. Crystals were irradiated with the 25 MeV LINAC at the Idaho Accelerator Center over intervals of 1, 2, and 4 hours. Each sample was irradiated and cured with blue UV light twice. Measurements of the intensity were taken after irradiation, and after blue light curing just before the next irradiation. Each measurement was made twice: once with the sample resting in its original position at the time of irradiation and again with the sample tilted 90 degrees. These two measurements were averaged together. Graphs shown on this page are moving average fits binned at 20 data points per bin. A link to graphs binned at 100 data points is provided under each graph for comparison.
		+	<br>
		+
		+
		+	Dose calculations were made using measurements of the instantaneous beam current taken regularly throughout each irradiation.
		+	<br>
		+
		+
		+	<center>[[Image:Block161cmavg.JPG]]</center>
		+
		+	<b>Block 16 Data. </b> Blue light curing appears to be effective after 1st irradiation in > 680 nm region. Blue light curing
		+	after the 2nd irradiation shows a significant decrease in the transmission coefficient; this effect is anomalous in comparison to the data for further samples. All lines show a sharp increase around 550 nm. Binned at 100: [[http://www.iac.isu.edu/mediawiki/index.php/Image:Block161cmavgbinnedat100.JPG]]
		+
		+	<center>[[Image:Block181cmavg.JPG]]</center>
		+
		+	<b>Block 18 Data. </b> Blue light curing appears to be effective after 1st irradiation in > 680 nm region with no effect after 2nd irradiation. All lines show a sharp increase around 550 nm. Binned at 100: [[http://www.iac.isu.edu/mediawiki/index.php/Image:Block181cmavgbinnedat100.JPG]]
		+
		+
		+	<center>[[Image:Block331cmavg.JPG]]</center>
		+
		+	<b>Block 33 Data. </b> Blue light curing appears to be effective after 1st irradiation in > 680 nm region with no effect after 2nd irradiation. All lines show a sharp increase around 550 nm. Binned at 100: [[http://www.iac.isu.edu/mediawiki/index.php/Image:Block331cmavgbinnedat100.JPG]]
		+
		+
		+	<center>[[Image:Block391cmavg.JPG]]</center>
		+
		+	<b>Block 39 Data. </b> Blue light curing appears to be effective in all regions after both irradiations. Post-bleach lines show a sharp increase around 550 nm. Binned at 100: [[http://www.iac.isu.edu/mediawiki/index.php/Image:Block391cmavgbinnedat100.JPG]]
		+
		+
		+
		+	Presently there is no data available for the transmission coefficient of light incident on an undamaged PbF2 sample. The data for samples 18 and 33 show nice agreement for both trials. This data is also in agreement with the first trial for block 16. Block 39 shows the effect that was expected from the results of previous experiments with PbF2 crystals.
		+
		+
		+	Questions:
		+
		+
		+	1) We are interested in obtaining the transmission data for undamaged samples. Is this data available anywhere?
		+
		+	2) Blocks 39 and 16 show discrepancies in transmission measurements. Are there any differences in the lattice structures of these two samples?
		+
		+	3) All blocks show sharp increases at certain wavelengths that track after optical bleaching and occassionally just after irradiation. Is there an explanation available to explain this phenomenon?
		+
		+	References:
		+
		+	[1] Roche, J. How to do Transmission Measurements of the DVCS crystals. Oct. 15, 2007.

	=References:=		=References:=