# Presentation: 349876

## SESAME Status

Ahed AL Adwan (SLS, SESAME)
EPICS Collaboration Meeting
Bessy, May 2002

**SESAME ****Status**
**Ahed AL Adwan (SLS, SESAME)**
**EPICS Collaboration Meeting**
**Bessy, May**** 2002**

**Synchrotron-light for Experimental Science and Applications in the Middle East**

## What is SESAME?

**The ****Middle East's first major international research cent****e****r **
**A medium energy light source under the UNESCO auspices**
**An Upgrade for Bessy I, a gift from the German Gov.**
**To be built in Jordan in Allan (30 km from Amman)**
**With a 14 member countries from the region (****Armenia, Cyprus, Egypt, Greece, Iran, Israel, Jordan, Kuwait, Morocco, Oman, Pakistan, PA, Turkey, ****and UAE**** ****)**

## SESAME Evolution

**	**

**1997, Herman Winick from SLAC and Gustav-Adolf Voss from DESY suggested that BESSY I**** to be moved to the Middle East after it is shutdown on 1999.**
**Oct 1999, 1st ****conceptual design report for the facility****.**
**Jun 2000, The site was chosen in Jordan.**
**Sep 2000, 18 participants to receive advanced training at ****ANKA, Daresbury, DESY, Elettra, ESRF, LURE, MAXLAB, and ****the SLS.**
**Mar 2001, Jordan will fund the construction.**
**Sep 2001, ****full-time Technical Director, Professor Dieter Einfeld **
**Oct 2001, SESAME is officially under UNESCO auspices, UNESCO general conference.**
**April 2002, 2nd conceptual design report to be submitted to EU.**
**June 2002, Bessy I to be shipped to Jordan**
**Sep 2002, Ground Breaking Ceremony**
**...**

**Notes:**
*Considerations: gas load, vacuum chamber profile, conditioning time, In-situ bake out, cost, space..
*Pumping speed.
*Types.
*Lumped Pumps:
*Standard ranges available in the market.	
*Cheaper.	
*Installation, services and maintenance could be easier.	
*A valve can isolate it from the machine.	

## SESAME LATTICE ( VER 8 ) 

## Slide 5

## SESAME Control System Guidelines

**Optimum Price/Performance**
**A tight budget, Incorporate as many standard reliable commercial and open source products.**
**Avoid reinvention, No resources for development.**
**Standardization; SW & HW**
**1 CS for Machine and Beamlines**

**Kathy Bell:**

**Notes:**
Properties: vacuum performance, mechanical strength, thermal conductivity, magnetic permeability... etc,
Vacuum performance: photodesorption yield reduction with the beam dose, Cu and Al start higher than St. steel.
Stainless Steel (316LN alloy):
*Good mechanical strength, high hardness. 
*Low outgassing rates.
*Low magnetic permeability: can be used withen magnets
*Easy to weld, but the fabrication is not as easy as AL.
*Low electrical conductivity: low eddy currents
*Baked out up to (350C), firing to 900C.
*Low thermal conductivity: so Cu need to used as absorbers materials because of its good thermal conductivity.

## What we like about the SLS CS:

**EPICS low level controls, extensive use of epics database (more reliable, better performance).**
**Linux PCs as Consoles.**
**Timing system.**
**Turn-Key subsystem (Industry participation)**

**Notes:**
*Beam lifetime must be more than 10 hours and achieved as soon as possible from the beginning of the machine operation.

*Meet the design parameters.
*Smooth chamber to minimise the electromagnetic fields induced by the beam.
 *Sufficient cooling to dissipate the heat load associated with synchrotron radiation
*sufficient monitoring: achieving the pressure is as much important as monitoring the pressure.
*Reasonable cost: for example lower cost if the design was without in situ bake out, distributed pumps...etc.
*Flexible system for improvements and upgrading.

## So far:

**2 Engineers for 1 year now at the SLS (20 %)**
**I/O points + HW + Computing infrastructure rough estimation.**
**Leads to a rough Cost estimation.**
**2 full Test stand Crates, 21 slot each as a donation from the SLS, (PPC, vxWorks 5.3.1, EPICS 3.13.5)**
**All EPICS database (soft), based on I/O points, is running on the crates (using the SLS naming conventions). **
**Participating on the SLS SR, BL commissioning and daily operation.**

**Notes:**
*Size and Considerations: things need to be taken into consideration: gas scattering, Touscheik scattering, close orbit error, injection requirements, momentum acceptance. All these will give beam stay clear, then engineering requirements and RF requirements need to considered.

*Designs; two main designs: 1) a straight with full antechamber
		      2) antechamber in the bending 		magnets and the 1st focusing magnets with 		distributed cooling.
*The introduction of the electrode of the BPM: welding it directly to the BPM blocks or use a separate flange to hold the electrodes which is then connected to the BPM blocks, to get rid of the misreading: optical sensors or connected to the bellows.
*Slit opening and vertical height; must be calculated very carefully to prevent high local thermal stress.

## I/O points & Controllers

## Still Ahead...

**EPICS Application Development Environment.**
**RDB**
**API Abeans?, CDEV?, OO CA?; performance & BD req.**
**RTOS; RTEMS, L4Linux (HW support, Industry + other labs)**

**Notes:**
Distributed Pumps	
Designed for individual.
More expensive. 	
The installation and maintenance.
It can’t be isolated from the machine by means of valves.
The answer is...!
Use lumped pumps all over and in case there are places with high gas load, distributed pumps could be used.