HRRL radiation footprint simulations - Revision history

Oborn: /* Simulation report */

2010-10-07T21:22:58Z

Simulation report

Oborn: /* Geometry definitions */

2010-09-01T15:52:30Z

Geometry definitions

Oborn: /* Geometry definitions */

2010-08-31T17:55:32Z

Geometry definitions

Oborn: /* Shielding The Radiation */

2010-08-31T17:53:32Z

Shielding The Radiation

Oborn: /* Shielding The Radiation */

2010-08-31T17:53:11Z

Shielding The Radiation

Oborn: /* Shielding The Radiation */

2010-08-29T19:21:05Z

Shielding The Radiation

Oborn: /* Geometry definitions */

2010-08-29T19:18:15Z

Geometry definitions

Oborn: /* Geometry definitions */

2010-08-29T19:17:36Z

Geometry definitions

Oborn: /* Geometry definitions */

2010-08-29T19:12:47Z

Geometry definitions

Oborn: /* Geometry definitions */

2010-08-29T19:11:29Z

Geometry definitions

← Older revision		Revision as of 21:22, 7 October 2010
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−	The development of a positron source for JLab using the HRRL requires moving the HRRL to a new location in order to have sufficient room to construct an achomat beam line. Three measurements of the radiation footprint have been done and used to estimate the radiological impact of moving the HRRL. The simulation package Geant4 was used to estimate ~~the changes to~~ the radiation footprint that will result ~~from moving~~ the HRRL accelerator cavity ~~near the entrance~~ to the accelerator room. The simulation indicates that moving HRRL to the proposed position will increase the radiation at the doorway to the accelerator room by a factor of 8.6. The simulation also estimates that a 1.2 cm thick lead shield around the accelerator will reduce the radiation at the door way to its original levels. If we use this prediction to extrapolate the radiation measurements made, then one can estimate safe operation by restricting the HRRL rep rate to below 400 Hz. This restriction can	+	The development of a positron source for JLab using the HRRL requires moving the HRRL to a new location in order to have sufficient room to construct an achomat beam line. Three measurements of the radiation footprint have been done and used to estimate the radiological impact of moving the HRRL. The simulation package Geant4 was used to estimate the radiation footprint that will result if the HRRL accelerator cavity is moved closer to the accelerator room entrance. The simulation indicates that moving HRRL to the proposed position will increase the radiation at the doorway to the accelerator room by a factor of 8.6. The simulation also estimates that a 1.2 cm thick lead shield around the accelerator will reduce the radiation at the door way to its original levels. If we use this prediction to extrapolate the radiation measurements made, then one can estimate safe operation by restricting the HRRL rep rate to below 400 Hz. This restriction can
	be changed based on radiation footprint measurements made after the HRRL is moved. We request amending the current operating license for the HRRL to restrict it's repetition rate to less than 400 Hz so it may be moved to the proposed location.		be changed based on radiation footprint measurements made after the HRRL is moved. We request amending the current operating license for the HRRL to restrict it's repetition rate to less than 400 Hz so it may be moved to the proposed location.

← Older revision		Revision as of 15:52, 1 September 2010
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	Dr. Forest: Wall#8 is the doorway. Wall#1 is the wall next to doorway. They are different. Doorway was named as wall#8 in simulation.		Dr. Forest: Wall#8 is the doorway. Wall#1 is the wall next to doorway. They are different. Doorway was named as wall#8 in simulation.
		+
		+
		+	Should the wall #8 label appear on the blue surface?
		+

	{\| border="1" \|cellpadding="20" cellspacing="0		{\| border="1" \|cellpadding="20" cellspacing="0

← Older revision		Revision as of 17:55, 31 August 2010
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	Sadiq: Is wall #8 in Figure 7 the same as wall #1 in Figure 6? If so relabel wall #8 to be wall #1.		Sadiq: Is wall #8 in Figure 7 the same as wall #1 in Figure 6? If so relabel wall #8 to be wall #1.
		+
		+	Dr. Forest: Wall#8 is the doorway. Wall#1 is the wall next to doorway. They are different. Doorway was named as wall#8 in simulation.

	{\| border="1" \|cellpadding="20" cellspacing="0		{\| border="1" \|cellpadding="20" cellspacing="0

@@ Line 161: / Line 161: @@
 Cavity was shifted to new location to study the radiation and shielding effect on radiation.  We used cylindrical shielding around the cavity and one cap at the upstream end of the cavity. Shielding was increased by the increment of 6 mm.  At 2 increments, radiation was reduced to same level as before shifting.
@@ Line 183: / Line 176: @@
 |-
 |}
 ==Conclusion==

← Older revision		Revision as of 17:53, 31 August 2010
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	sadiq: insert the correct table from below.		sadiq: insert the correct table from below.
		+
		+
		+
		+
		+
		+
		+	{\| border="1" \|cellpadding="20" cellspacing="0
		+	\|-
		+	\|Increment \|\| <math> E_{\gamma}~MeV </math> \|\| <math> E_{e}~(MeV) </math>\|\| <math> E_{tot}~MeV</math> \|\| <math> E_{tot}~per~electron~MeV</math> \|\|
		+	\|-
		+	\| 0 (before move) \|\| 12658.4 \|\| 8493.66 \|\| 21152.1 \|\| 0.00126584 \|\|
		+	\|-
		+	\| 0 (after move) \|\| 26394.9 \|\| 50108.1 \|\| 76503.1 \|\| 0.00263949 \|\|
		+	\|-
		+	\| 1 \|\| 17819.1 \|\| 430.89 \|\| 18250 \|\| 0.00178191 \|\|
		+	\|-
		+	\| 2 \|\| 10600.8 \|\| 293.753 \|\| 10894.5 \|\| 0.00106008 \|\|
		+	\|-
		+	\|}

	==Conclusion==		==Conclusion==

← Older revision		Revision as of 19:21, 29 August 2010
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	Cavity was shifted to new location to study the radiation and shielding effect on radiation. We used cylindrical shielding around the cavity and one cap at the upstream end of the cavity. Shielding was increased by the increment of 6 mm. At 2 increments, radiation was reduced to same level as before shifting.		Cavity was shifted to new location to study the radiation and shielding effect on radiation. We used cylindrical shielding around the cavity and one cap at the upstream end of the cavity. Shielding was increased by the increment of 6 mm. At 2 increments, radiation was reduced to same level as before shifting.
		+
		+
		+	sadiq: insert the correct table from below.

	==Conclusion==		==Conclusion==

@@ Line 129: / Line 129: @@
 A screen shot of the simulations accelerator cell volume is shown in Figure 6.  Standard concrete was used to define the wall material.  The event shown represents a 10 MeV electron directed towards wall #2 which intersects a 2mm thick Tungsten target.  In this particular event, several photons and 2 charged particles escape the Tungsten converter.  Figure 7 illustrates the region of interest, the doorway.  All particles which intersected the doorway were recorded for analysis.  A coordinate system is defined to have its origin located at the lower left corner of the doorway as seen from outside the accelerator cell.
-  Sadiq: Is wall #8 in Figure 7 the same as wall #1 in Figure 6?
+  Sadiq: Is wall #8 in Figure 7 the same as wall #1 in Figure 6?  If so relabel wall #8 to be wall #1.
 {| border="1"  |cellpadding="20" cellspacing="0

@@ Line 127: / Line 127: @@
 === Geometry definitions===
-A screen shot of the simulations accelerator cell volume is shown in Figure 6.  Standard concrete was used to define the wall material.  The event shown represents and electron beam directed towards wall #2 that intersects a 2mm thick Tungsten target.  In this particular event,
+A screen shot of the simulations accelerator cell volume is shown in Figure 6.  Standard concrete was used to define the wall material.  The event shown represents a 10 MeV electron directed towards wall #2 which intersects a 2mm thick Tungsten target.  In this particular event, several photons and 2 charged particles escape the Tungsten converter.  Figure 7 illustrates the region of interest, the doorway.  All particles which intersected the doorway were recorded for analysis.  A coordinate system is defined to have its origin located at the lower left corner of the doorway as seen from outside the accelerator cell.
   Sadiq: Is wall #8 in Figure 7 the same as wall #1 in Figure 6?

@@ Line 126: / Line 126: @@
 === Geometry definitions===
 Volumes in simulation defined as given in Fig. 6 and Fig. 7.
 {| border="1"  |cellpadding="20" cellspacing="0
@@ Line 135: / Line 139: @@
 | [[Image:wall8_dz_doorway.jpg | 300 px |thumb|Figure 7. Definition of the doorway.]]
 |}<br>
 === Energy deposited===